Shran
Junk Collector
TRS Forum Moderator
Supporting Member
Article Contributor
V8 Engine Swap
Solid Axle Swap
Truck of Month
- Joined
- Mar 4, 2008
- Messages
- 8,690
- Reaction score
- 4,791
- Points
- 113
- Location
- Rapid City SD
- Engine Type
- V8
- Engine Size
- 5.0
Helping a buddy here, his setup is an '89 Ranger with a 4.0 swap from a '94 Explorer. Explorer engine harness and dash harness were used. The engine itself was from a 1992 Explorer and was recently rebuilt by a reputable shop (all the usual stuff, bore, pistons, new heads, etc) and replaced the '94 engine that was originally in the truck, which ran fine but was rather high mileage. The EGR system and cam sensor from that engine were installed into the new engine.
The specific problem he is having is a hesitation right off idle. Once you get past that, it runs great. This issue did not originally occur with the new engine. He told me that they initially thought it was just the ECM re-learning a new engine or something related to break-in but it continued and now they have replaced the coil pack, injectors, MAF sensor, IAC, coolant temp sensor but the issue persists. I don't think he has pulled codes on it yet.
To me it sounds like the EGR valve could be suspect based on issues I've had with those before. He also stated that the engine builder dropped the cam sensor in without aligning it. So two possibilities to rule out there before anything else.
My question: I have an ECM from a '93 Explorer. That vehicle did not have EGR or a cam sensor. Has anyone tried using an older ECM with a newer harness/engine to eliminate EGR or a cam sensor or both? I am kind of assuming that the '93 computer would just ignore those two components? We are kind of just looking at all the options, if the ECM swap would effectively eliminate those things then it would be cheaper to go that route rather than throw more parts at it.
The specific problem he is having is a hesitation right off idle. Once you get past that, it runs great. This issue did not originally occur with the new engine. He told me that they initially thought it was just the ECM re-learning a new engine or something related to break-in but it continued and now they have replaced the coil pack, injectors, MAF sensor, IAC, coolant temp sensor but the issue persists. I don't think he has pulled codes on it yet.
To me it sounds like the EGR valve could be suspect based on issues I've had with those before. He also stated that the engine builder dropped the cam sensor in without aligning it. So two possibilities to rule out there before anything else.
My question: I have an ECM from a '93 Explorer. That vehicle did not have EGR or a cam sensor. Has anyone tried using an older ECM with a newer harness/engine to eliminate EGR or a cam sensor or both? I am kind of assuming that the '93 computer would just ignore those two components? We are kind of just looking at all the options, if the ECM swap would effectively eliminate those things then it would be cheaper to go that route rather than throw more parts at it.