Electrical Technical Information Discussion, 93 deville ecm replacement in Item Specific Cadillac Discussion; I was looking around on this sight to see if I could find any info or tips for replacing my ...
I was looking around on this sight to see if I could find any info or tips for replacing my ECM. I will be doing the job soon and I pretty much know how to do the job, you know, the memcal chip and all that jazz, but I was just wondering if anybody had any tips on stuff to keep my eyes open for. I am replacing the ECM as a last resort, the car acts like it has a ISC or TPS problem but both have been tested adjusted and replaced along with the O2 sensor, thermostat and catalytic convertor, and of course a full tune up, filters and all,and the throttle body has been cleaned including the EGR tubes the car still has a surging idle ocassionaly and sometimes when I let off the gas I can feel the pedal move up and down, and everytime I shut off the car and get out the ISC ratchets for about 10 to 15 seconds, now with all that said, I should have mentioned that I have been checking the codes the whole time, and I have never seen a code pop on this car since I have owned it, something don't jive, thats why I am going with the ECM. On that note, again if anyone else has any advice, I'll take it!!
Hey 91 eldo, did you ever find out what you need? cause if you didnt, I just finished the job so PM me and I will fill you in on what I learned.
Hello Jack and all. I have a 92 Deville that I inherited from my dad. In his old age, he had not taken as good care of it as he should have. It had a blown head gasket so I had the motor re-built. Unfortunately, the people who did it, knew nothing about all the sensors and such and it appears they blew out the computer--I replaced it--ouch. The idle has never been right--too high or fluctuating. I had to do the "idle learn" every few days until I messed up the battery posts by unscrewing the bolts so many times. I finally broke down and let a mechanic put in a new ISC--I guess they are not made or rebuilt too well because the replacement was bad. He put in another one. Now, the gas pedal jumps around after I shut off the motor. I can also feel a slight pop of the pedal under my foot when I back off the gas while I'm driving. I have asked him about the TPS but he didn't seem to want to mess with that.(Perhaps he didn't know how to adjust it). Anyway, I don't have 50 posts so I can't PM anyone but would sure like to know if I have a throttle cable that may be binding or sensor I need to check. With the last bad TPS, I got a code 30 TPS rpm out of range. I am getting no codes on the new one. O2 sensor and catalytic converter have been replaced. I didn't want to break down and take it to the dealer--I'm not a rich man--but I seem to get a bad diagnosis or faulty parts from mechanics who are not Cadillac specialists. If this had not been my father's car, If would have junked it before I ever had the engine re-built but it was his car and I'm too far in to it to stop now....still need to fix power windows, radio, and AC but that's for another day. I really need to get past this problem.