TestPoint
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- August 21, 2009
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- Year, Model & Trim Level
- '00 5.0 in an '82 Volvo
The '96 - '01 series of Explorers/Mountaineers seem to be a difficult era to get valid information on engine swaps. I just left a comment on the 'Everything You Wanted To Know About PATS' sticky thread that I now know to be incorrect and I thought that might be a good time to 'lay it all out'.
The '96 - '01 V8's evolved through a series of changes that make this engine/transmission, wiring harness, fuel injection/fuel rail system, fuel pump and PCM confusing if not difficult to move to another vehicle.
The objective is to clearly define, in one place, all the unique issues associated with those differences.
Here is what I think I know:
Generally, the engine and transmission remained unchanged through this period except for the fuel system changes noted.
BUT
The '96-'97 model years did not have PATS.
The '98 -'01 MY's did
The '96-'98 MY's used a 45 psi fuel rail/injection system and a rail mounted mechanical fuel pressure regulator and a fuel return line to the tank.
The '99-'01 MY's used a 65 psi fuel rail/injection system and a tank mounted pump and mechanical regulator without a fuel return line. This system added a tank mounted sensor to return a pressure signal to the PCM.
The wiring harness for the engine and transmission was unchanged in the '96-'97 MY's
The early '98 MY, some have referred to it as '97.5, had some harness changes as yet undefined. Based on the information provided in this thread: http://www.explorerforum.com/forums/showpost.php?p=3350589&postcount=198 there was a period of several months, build dates 11/96 - 03/97, where PATS was not implemented but the later fuel system was used.
The wiring harness changes for '99-'01 affected the main body to engine/transmission C115 connector, the injector connections and the engine/transmission connector. In short, if you are using an early engine and a late transmission, or vice versa, you are SOL or at least subject to a lot of posts on this forum trying to resolve the issues.
Specifically, the injectors AND the injector connectors are not the same '96-'98 and '99-'01
[edit note]
I thought it a good idea to update the original post with new information developed on this thread due to what has turned out to attract a significant number of posts.
The engine/transmission harness changed with the '98 MY. Details on the early/late wiring changes can be found in post #27 , #31 and #82 .
The Cam Shaft Position Sensor changed with the '98 MY. The early sensor was a powered 3 wire device with a single shielded connection to the PCM. The later was a 2 wire Hall Effect sensor with a connection to the same C202 PCM pin. The sensor is reported to have to be matched to the PCM i.e. early PCM/early sensor, late PCM/late sensor . . . but in post #26 DELEXPLODER has a late engine/cam position sensor running with an early non-PATS PCM. That seems reasonable as the sensor lead to the PCM is consistent from early to late.
After getting my engine to run I can definitively report that PATS in the '00 PCM can be turned off with a custom tune without either the PATS control module or a chipped key. By inference that should apply to the entire '98 through '01 systems.
Now, what I know I do not know;
Will a '96-'07 PATS-less PCM drive the '99-'01 higher fuel pressure systems with an external mechanical regulator?
Will a PATS-less PCM properly manage the fuel trim on a '99-'01 65 psi fuel system (assuming the addition of an external adjustable pressure regulator)
. . . and if so . . . what pressure should the regulator be adjusted to.
I have now posted more than I know . . . .
Corrections and comments appreciated!
The '96 - '01 V8's evolved through a series of changes that make this engine/transmission, wiring harness, fuel injection/fuel rail system, fuel pump and PCM confusing if not difficult to move to another vehicle.
The objective is to clearly define, in one place, all the unique issues associated with those differences.
Here is what I think I know:
Generally, the engine and transmission remained unchanged through this period except for the fuel system changes noted.
BUT
The '96-'97 model years did not have PATS.
The '98 -'01 MY's did
The '96-'98 MY's used a 45 psi fuel rail/injection system and a rail mounted mechanical fuel pressure regulator and a fuel return line to the tank.
The '99-'01 MY's used a 65 psi fuel rail/injection system and a tank mounted pump and mechanical regulator without a fuel return line. This system added a tank mounted sensor to return a pressure signal to the PCM.
The wiring harness for the engine and transmission was unchanged in the '96-'97 MY's
The early '98 MY, some have referred to it as '97.5, had some harness changes as yet undefined. Based on the information provided in this thread: http://www.explorerforum.com/forums/showpost.php?p=3350589&postcount=198 there was a period of several months, build dates 11/96 - 03/97, where PATS was not implemented but the later fuel system was used.
The wiring harness changes for '99-'01 affected the main body to engine/transmission C115 connector, the injector connections and the engine/transmission connector. In short, if you are using an early engine and a late transmission, or vice versa, you are SOL or at least subject to a lot of posts on this forum trying to resolve the issues.
Specifically, the injectors AND the injector connectors are not the same '96-'98 and '99-'01
[edit note]
I thought it a good idea to update the original post with new information developed on this thread due to what has turned out to attract a significant number of posts.
The engine/transmission harness changed with the '98 MY. Details on the early/late wiring changes can be found in post #27 , #31 and #82 .
The Cam Shaft Position Sensor changed with the '98 MY. The early sensor was a powered 3 wire device with a single shielded connection to the PCM. The later was a 2 wire Hall Effect sensor with a connection to the same C202 PCM pin. The sensor is reported to have to be matched to the PCM i.e. early PCM/early sensor, late PCM/late sensor . . . but in post #26 DELEXPLODER has a late engine/cam position sensor running with an early non-PATS PCM. That seems reasonable as the sensor lead to the PCM is consistent from early to late.
After getting my engine to run I can definitively report that PATS in the '00 PCM can be turned off with a custom tune without either the PATS control module or a chipped key. By inference that should apply to the entire '98 through '01 systems.
Now, what I know I do not know;
Will a '96-'07 PATS-less PCM drive the '99-'01 higher fuel pressure systems with an external mechanical regulator?
Will a PATS-less PCM properly manage the fuel trim on a '99-'01 65 psi fuel system (assuming the addition of an external adjustable pressure regulator)
. . . and if so . . . what pressure should the regulator be adjusted to.
I have now posted more than I know . . . .
Corrections and comments appreciated!