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The VIN (Vehicle Identification Number) is a serial number used to identify an individual vehicle.  The VIN for each vehicle is unique.
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Warning: The unauthorized reproduction or distribution of this copyrighted work is illegal. ALLDATA LLC (“ALLDATA”) makes available information, materials, and products on this Web site, subject to the following terms and conditions. Events at Ford Motor Company have been silently spelling the end for their bread-and-butter V8 of the last two decades.
The 4.6 would be standard equipment in 1992 for the updated Ford Crown Victoria and Mercury Grand Marquis. 1997 would see the expanded versatility of the 4.6 with its placement in the new F-150 and the E-Series vans that had been redesigned for 1992. While the intent of this article is to focus on the 2 valve version of the 4.6, it needs to be noted there were 3 valve and 4 valve versions offered at various times.
The general driving characteristics of the 4.6 were remarkably different from what most operators were accustomed. It is still not unusual in this part of the United States to find cars powered by early versions of the 4.6 to be blowing smoke upon acceleration. Fortunately the author has not encountered this on any of the 4.6 liter engines he has owned, yet the issue is real. Beginning in 1996, Ford placed intake manifolds on the 4.6 liter engines constructed of a nylon composite manufactured by DuPont. In the early 2000’s, there was a class action lawsuit brought against Ford due to the failure of these intake manifolds. As mentioned for the Mustang, this power plant was not readily met with enthusiasm by the performance crowd. Despite the production of this engine currently being in E-Series vans only, these little power plants will continue to power current and future Curbside Classic’s of many varieties for countless years to come. I still kinda miss that car sometimes, but after nearly five years of ownership I was ready to move up. I’ve never heard of the early engines having problems with the spark plugs breaking off, that is a 3 valve version thing.
Only removing the plugs on a cold engine if it has an aluminum head is a long standing practice. In regards to the oil consumption and the valve guide seals, I have not seen it as a big of an issue as many make it out to be.
If they are charging that much for spark plug replacement in a 3 valve they either do not know what they are doing, or are flat out ripping you off. The spark plug access problem reminds me of the frequent complaints levied against big block Mustangs: Unless you were Plastic Man, getting at the plugs on an FE engine in one of the smaller Fords was dangerously close to being an engine-out job. Was it the Boss 429 that required either the engine to be jacked up to get at the last spark plug, or was it the brake master cylinder had to be removed? 2004 F150 Heritage standard cab, aftermarket flat bed, 90,000 miles, dual exhausts installed, everything else stock in the drive-train. Personally having owned a pair of early 92 CVs with the mechanically shifted AOD I prefer it to the electronically shifted AOD-E I had in the 93. I bought a 1991 v-8 Ford CrownVic for my wife, since I didn’t want her driving one of the Plastic Coffin Bubble cars.
The first time we had a 4.6 in for a plug change the disaster that they are known for happened to us. We had problems with the ones with the three threads mostly because the techs had not done it before.
So Jason do you notice much difference in power between your 92 Vic (190 HP) and 01 (220hp)? My understanding is interchangeability with the engines was a nice by-product of their construction method – such as swapping heads side to side.
The 3.7-liter V-6 engine provides the 2005 Jeep Grand Cherokee with an efficient, durable and smooth base engine. Significant changes in the 3.7-liter include a revised cam profile and new valve lash adjusters. The 4.7-liter V-8 was updated for the 2005 model year and was the mid-range engine in 2005-2007 model Grand Cherokees.
The vinyl ester glass-reinforced thermoset plastic modules, which are unique to the left- and right-side cylinders, include the cover, gasket, and fasteners. Dana engineers worked closely with DaimlerChrysler's technical staff to provide 3-D solid models to fit tight, under-the-hood requirements. The 5.7-Liter V-8 HEMI engine that powers the 2005-2008 Jeep Grand Cherokee uses aluminum cylinder heads with hemispherical combustion chambers, creating outstanding airflow leading to high power and torque. The Chrysler Group MDS seamlessly alternates between smooth and economic four-cylinder mode when less power is needed and V-8 mode when more power from the 5.7-liter HEMI engine is in demand. Some of the significant technologies enabling the MDS are the speed of electronic controls, the sophistication of the algorithms controlling the systems and the use of Electronic Throttle Control.
This engine and MDS has completed over 6.5 million customer-equivalent miles through Chrysler Group’s development and durability testing. The HEMI engine that powers the 2005 Jeep Grand Cherokee uses aluminum cylinder heads with hemispherical combustion chambers, creating outstanding airflow leading to high power and torque.
The all-new 2nd generation 5.7-liter HEMI V-8 engine offers better fuel economy, improved idle quality and overall refinement, along with more horsepower and torque. The fuel-saving MDS system seamlessly alternates between smooth, high- fuel-economy four-cylinder mode when less power is needed, and V-8 mode when more power from the new 5.7-liter HEMI engine is in demand.
The 6.1L-liter V8 HEMI made its Jeep debut in the 2006 Grand Cherokee SRT8 which went on sale in January of 2006.
Engine breathing was increased with new higher-flow cylinder heads, a specially designed intake manifold, and exhaust headers with individual tubes encased in a stainless steel shell, all unique to the 6.1-liter HEMI engine.
To further increase horsepower, performance-oriented camshaft profiles were developed to allow more air in and out of the cylinders, as well as manage a higher engine speed. SRT engineers increased the HEMI's peak power output engine speed by nearly 20 percent to 6,000 revolutions per minute (rpm) from 5,000 rpm.
The high-performance SRT 6.1-liter HEMI is strengthened with redesigned components, including a reinforced engine block, forged micro-alloy steel crankshaft with retuned damper, high-strength powdered metal connecting rods and floating-pin pistons.
A 6.4L-liter V8 HEMI with MDS has been approved for production and will debut in SRT8 models of the 2011 Challenger, the 2011 Charger and the 2011 300C. Deep-skirt cast-iron block with cross-bolted main bearing capsAluminum alloy heads with hemispherical combustion chambers. Pushrod-operated overhead valves, 16 valves, eight deactivating and eight conventional hydraulic lifters, all with roller followers. Pushrod-operated overhead valves, 16 valves, eight conventional hydraulic lifters, all with roller followers. These new valve springs CANNOT be used as replacement springs on the older model year (2003-2008) 5.7L Hemi engines.


With the addition of MDS to HEMI-equipped Dodge Durango and Ram, MDS-equipped vehicles through the end of the 2007 model year will save more than 60 million gallons of fuel each year. The Chrysler Group MDS (Multi-Displacement System) seamlessly alternates between smooth, high fuel economy four-cylinder mode when less power is needed, and V-8 mode when more power from the 5.7L HEMI® engine is in demand," said Eric Ridenour, Executive Vice President Product Development, Chrysler Group.
The MDS was part of the engine's original design," said Bob Lee, Vice President Powertrain Product Team, Chrysler Group. Some of the significant technologies enabling the Chrysler Group MDS are the speed of electronic controls, the sophistication of the algorithms controlling the systems and the use of Electronic Throttle Control.
The HEMI engine with MDS has completed over 6.5 million customer- equivalent miles through Chrysler Group's development and durability testing. Customers will experience estimated fuel economy gains of up to 20 percent under various driving conditions, and a projected 10 percent aggregate improvement. The Multiple Displacement System (MDS) provides cylinder deactivation during steady speed, low acceleration and shallow grade climbing conditions to increase fuel economy. Deactivation occurs during the compression stroke of each cylinder, after air and fuel enter the cylinder. The Multi Displacement System selectively deactivates cylinders 1,4,6, and 7, to improve fuel economy. Just a few simple tips can help owners of Chrysler Group engines with Multi-Displacement System (MDS) get the most fuel mileage possible from their 5.7L HEMI® V8 engine. The customer does not need to drive in a certain way to realize a fuel economy improvement with MDS, but these driving habits can maximize their fuel savings with this technology.
Toyota Corollas have been made with carburetorless ignition systems for more than 10 years.
Make sure the battery cable clamps are tight and clean where they connect to your Corolla's battery. Use an OBD-II scan tool to check the system, making sure your tool is for your year Corolla. The following scan tool codes are standard for ignition system related problems: "P0355" and "P1335" are for crankshaft position sensor problems, "P0340-P0341" are camshaft position sensor problems, "P0351-P0354" mean ignition coil trouble, and "P1300," "P1305," "P1310" and "P1315" mean ignition system malfunctions. You can only check a Corolla's ignition coils by substituting a good coil, because Toyota doesn't publish the resistance specifications.
The ignition coil plays a vital role in the ignition system's ability to create combustion.
We do not claim that the car got in our databank has salvage title, but the fact that it has been damaged for sure. In the United States of America, criminal copyright infringement, including infringement without monetary gain, is investigated by the FBI and is punishable by up to 5 years in federal prison and a fine of $250,000.  Additionally, other countries may have other civil and criminal penalties that may apply. By accessing this site, you agree to the terms and conditions as outlined in this legal notice. Even with the restrictive factory air filter box and wimpy single exhaust, it felt pretty stout. Now the first version of the PI (performance improved) head only had about 3 threads for the spark plugs and they are known for blowing out of the head particularly if someone, or the machine at the factory, overtorqued the plugs. The different expansion rates of the metals mean that there is more interference in the threads and you can strip them if you remove them hot.
I’ve had several with lots of miles that did not smoke or use excessive amounts of oil. Ford modified the valve seals starting in ’96 in order to eliminate the premature wear issue.
I recall the angst Mustang GT owners had when they learned their 5.0 was to be replaced with this 4.6! I’ve seen junked CVPIs turned into taxis with over 400,000 miles on them that are driven to the yard and junked becuse of some other expensive non-drivetrain issue. I think it’s that magical combination of off idle torque and the sound that it generates.
I think the most amazing part is that the original exhaust lasted 900k miles driving primarily in the rust belt. Any time I get one I always check the odometer or ask the driver, and most of them where I live are ex-CVPI’s or ex-NYC taxis.
Fortunately there was enough head left to tap new threads into the socket: I made sure to put in a stainless-steel sleeve with many more than three threads.
This innovation eliminates the time- consuming and costly steps of precisely aligning and attaching the gasket to the valve cover with adhesive.
Dana also provided material development and component validation to ensure robust system performance. The new engine offers better fuel economy, power, and torque than the previous 4.7-liter engine, while increasing refinement, thanks to dual spark plugs per cylinder, increased compression, better cylinder-head port flow, and a new combustion system. Chrysler Group has developed the Multi-Displacement System (MDS) that deactivates four cylinders when the V-8 is not needed. This optimizes fuel economy when V-8 power is not needed without sacrificing vehicle performance or towing capability. Dual ignition (two spark plugs per cylinder) increases peak power and torque, reduces exhaust emissions, increases fuel economy and provides a smooth idle. HEMI has always been synonymous with power, and now - thanks to VVT, expanded four-cylinder mode in the MDS system, and a host of other technologies - Chrysler's new HEMI delivers more fuel efficiency and refinement, along with even more power. When MDS is operating, it is indicated by the fuel-economy- mode readout in the Electronic Vehicle Information Center.
When SRT powertrain engineers set out to develop a more powerful HEMI they were mindful of the engine's heritage, which led to adopting traditional HEMI engine cues including an orange-painted cylinder block and black valve covers.
A billet steel, high-strength camshaft features more overlap and lift for better performance.
Intake and exhaust valve stems are hollow, and the exhaust valve stems are filled with sodium to help dissipate heat more efficiently. The pistons are cooled by oil squirters, aimed at the underside of each piston to aid piston cooling for engine durability.
Intake valves feature hollow stems and 2 mm larger heads compared to the 5.7L engine, allowing more air flow.
The new springs have a greater installed height and will cause reduced open and closed spring force. Chrysler Group was also the first to offer cylinder deactivation in an SUV with the introduction of MDS in the 2005 HEMI-powered Jeep® Grand Cherokee. The HEMI will be able to transition from eight cylinders to four in 40 milliseconds (0.040 seconds). Improved fuel economy is realized without any change in customer experience -- drivers will receive the benefit without changing their driving habits and without compromising style, comfort or convenience.
Both four and eight cylinder configurations have even firing intervals providesmooth operation. Ignition then occurs, but the combustion products remain trapped in the cylinder under high pressure, because the valves no longer open. The interior fuse box is underneath the instrument panel to the left of the steering column.


ALLDATA reserves the right to change these terms and conditions from time to time at its sole discretion. Once I modified the airbox and added dual exhaust with low-restriction turbo mufflers, I could roast its mushy Michelin touring tires at will. Then if they don’t turn easily at that point add another little bit of carb cleaner and repeat.
Tires were wet but I didn’t think it had enough power to do anything other than chirp the tires.
They did improve the shifting schedule on the later AOD-E that was renamed the 4R7x(w) and the ones in our 02 GM and 03 Marauder do not annoy me like the one in the 93 did.
What struck me though was when an oxygen sensor went bad one time, the Ford dealer tech told my Dad he was lucky the faulty sensor was on THAT bank (could not recall which side it was), for the other bank required removal of the engine, as it was that tight between sensor and firewall. Decent power, decent mileage, and if you followed a reasonable PM program they never broke if used as intended. Geez; in the old days, medium sized trucks used six cylinders smaller than that, with half the hp. Then we repair it, if it is needed, and we send it back to you with a report of what caused the unit to go bad.
The engine has aluminum cross flow cylinder heads, four valves per cylinder, central injectors and dual overhead camshafts. To ensure quiet operation, a new thick-wall composite manifold is new for 2005, as are structural improvements to the air box and resonator. Dual knock sensors have been added for 2005 and enable improved engine calibration for both fuel economy and power output. The new thermoset plastic cylinder-head cover module was developed in just 12 months and replaces a magnesium component. With this new sealing system, Dana developed a custom compound material for gaskets and grommets. This collaborative effort eliminated the prototype step for the cover housing, which in turn reduced development time and cost by allowing the component to move directly from design to production. The combustion system has been refined and the engine uses direct-mount accessories for quieter operation. Other enhancements include an increased compression ratio and an active intake manifold with long runners for low-end torque and short runners for high-rpm power.
SRT engineers who developed the 6.1L engine achieved more horsepower by adding more cubic inches, increasing the compression ratio, and redesigning the cylinder head, intake and exhaust systems for better flow and increased engine speed. Cylinders are honed with torque plates to ensure a truer bore, to reduce friction and increase power. The intake manifold was designed with larger diameter and shorter runners for higher-speed tuning. The production version of the 6.4 engine is expected to produce anywhere from 470-hp to 510-hp.
The new spring comes with a new valve spring seat which should be replaced if converting 2009 or newer engine to the damper-less design. In addition to stopping combustion, energy is not lost by pumping air through these cylinders. Two cylinders on each bank are active when the engine is in four-cylinder mode – every other cylinder in the firing order.
As shown in the chart below, the duty cycle is more active at highway speeds and on level ground. The 93 that I sold to my buddy is at over 280K and while his is leaking some from the front seal it uses about the same amount of oil as mine.
Taxi drivers usually beat the hell out of their cars (at least in Chicago) and the 4.6 takes it in stride. Replaced it with a 2001 Merc GranM and ten years later, a UTA student ran a red light, center punched the drivers side door. When sending your unit for Repair, send us the DME Set: Our Dedicated 996 Porsche Tester works with this Set. The engine was first introduced in the Jeep Liberty and has been continuously refined to provide smooth V-6 power with optimal economy.
The updated engine has improved NVH characteristics, realized through the use of composite valve covers, structural improvements to the air box and resonator and improved dampening of the heat shields.
Due to innovative manufacturing processes, Dana was able to reduce the overall cost of the module, while incrementally improving noise, vibration, and harshness, or NVH. Dana also provided prototyping for the gasket and isolator molds to ensure the design met all of Jeep's specifications.
This allows more work to be transferred to the crankshaft instead of being rejected out of the exhaust port as heat. Exhaust runners allow increased gas flow while maintaining fast catalyst light-off, while adding 12 horsepower over the 5.7-liter engine’s cast manifolds.
The oil pan and windage tray are modified to manage oil return to the pan sump at high engine speeds and improve power. The new damper-less spring is also 5mm taller than the old spring when measured in free length. All of the cylinders that are deactivated have unique hydraulic valve lifters that collapse when deactivated to prevent the valves from opening. During subsequent piston strokes, this high-pressure gas is repeatedly compressed and expanded like an air spring, but fuel is not injected.
Other parameters that owners have discovered is that the engine operating temperature must be at least 130 degrees and oil pressure above 45 psi.
While some people can determine the point when MDS is engaged or disengaged by the sound of the exhaust (more notably on aftermarket exhaust systems), the light provides more exacting results as to when the MDS system is on or off. So even if you do leave a shell or two in the engine it still should not be more than a 3 hour or so job. Deep-fillet rolled journals for improved fatigue life, press fit damper to minimize torsional vibration. The 4R70W is the ultimate evolution of the AOD and it’s later iterations are virtually indestructible. The 4.6+4R70W is probably one of the toughest drive trains every produced for a car or light truck. I’m dreading changing the Spark Plugs, but at over 68,000 miles it runs smoothly, and will grab gravel and growl. When activated, pressurized oil pushes a latching pin on each valve lifter, which then becomes a “lost motion” link.
Its base follows the camshaft, but its top remains stationary, held in place against the pushrod by light spring pressure but unable to move because of the much higher force of the valve spring.



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