Resolved 1G ECU Question

[Boddie]

So my car is a 1991 Plymouth Laser RS Turbo. According to this, it seems I am suppose to have the ECU with part number MD166260. I do not have that though. I have part number MD165532 - E2T36581 which according to that page belongs to a 90-92 California spec automatic AWD turbo car.

I am wondering what issues may arise from this? Currently I have a barometric sensor CEL that will not go away. Changed the MAF and measured the wire voltage to the ECU and everything checked out, but still throws the code. I am also always running oober rich and burning a lot of fuel. I had this ECU sent to ECMTuning and got all the caps replaced and a few IC chips replaced. Still a no go...

If this is the main issue, does anyone know if there is a rewire that could fix this, or should I just continue to search for a new one and sell this one?

 

[Cdc1221]

Is it EPROM? If so, has the chip been swapped to a manual chip? If no to either of those, then you're running rich because the ecu is designed to run with 390 cc injectors, not 450. The baro issue could simply be a loose or broken wire

 

[Boddie]

Well I know it does have an EPROM chip, but not sure if it has been swapped out or not with anything else. Is there a chip number I can reference to tell what car the EPROM would belong to? I can take it out tomorrow again when it is daylight and I am off work.

 

[Cdc1221]

I honestly don't know. You might be able to call Thomas (ecmlink), or pm my1gdsm on here, or maybe he or Steve will pop into this thread. Both are knowledgeable with them

 

[Boddie]

I talked to Thomas through emails, and he said the only difference between the two ECUs is a single resistor. He said he does not think anything would affect the barometric sensor since they redid and tested everything. They are also willing to look at it again if need be. If I knew the resistor I would just replace it myself. I am very competent with electronics.

I am starting to consider other possible issues that I have been having lately might be related. For one my dome light only turns on occasional when I open the door. Yesterday I turned on my back wiper and my radio shut off. My serpentine belt is worn or possibly loose cause it squeals occasionally when its wet. I know that can do strange things to the electronics. Every once in awhile I give it gas and it just loses all power right away. I have just been thinking this was due to messed up baro readings or something but not really sure.

I think I am gonna start with checking out the alternator and battery at a store, then getting the belt looked at and replaced if needed, and then I will get my voltmeter out and just start testing all the connections I can find this weekend before re-sending the ECU in. Do you guys have any other suggestions?

 

[DSM1G90]

Maybe you need the MD128625 ECU - 5sp Federal - what's in my 90 Turbo Laser

 

[Boddie]

Have not got to sending in the ECU, because I have been needing the car. I did get the battery, alternator, and belt checked out, and it all was fine. Some of the codes I get I do not understand if I am reading correctly so I made a new thread, but probably should have just continued this one. Anyways the data is all on this page.

 

[got_psi]

Hey THANKS! this actually helped me solve a problem i was having...didnt even have to ask! look at that my first post and my question was answered without even asking it, already love this place haha