Moredumb Posted July 19, 2007 Report Share Posted July 19, 2007 I have 93 cutlass with 3100 spi engine M vin code. Anyways car has never failed me in 228,000 miles until yesterday it just stalled in traffic without warning ,wouldn't restart had it towed home. I checked fuel first ,psi is fine. I decided to pull codes , jumped A & B and got a constant mil, no flashing , I waited 4 or 5 minutes with key on still the same , figured ECM was bad . I put in reman ecm ,still same results and car won't start (cranks fine). I will also add that both radiator fans run when A&B jumped to pull codes , I pulled both fan relays and fuses for them , still no difference. I want to check grounds but I wanted to know if anyone else had a simular problem to save me time. Thanks Quote Link to comment Share on other sites More sharing options...
shyguy164 Posted July 19, 2007 Report Share Posted July 19, 2007 Wait, the fans still ran even after their fuses and relays were pulled? Quote Link to comment Share on other sites More sharing options...
Crazy K Posted July 19, 2007 Report Share Posted July 19, 2007 Wait, the fans still ran even after their fuses and relays were pulled? ??? i should check that! the fans turning on is normal. I am not certain that your car would do the code light flashing since it is a 93 with a 3100 SFI, and thus should be obd 1.5 (or so I understand) p.s. would you share your vin code, as the data from a 3100 sfi is beiung incorporated into records me and manic mechanic have been working on? (if not, your serial number, the last six digits of the VIN, would be sufficient) try this. take the spark plug end wire, one at a time, and stick a screwdriver in the end and lay on top of the engine. crank the engine and watch for spark. decribe the spark: blue ornage or none. and do the wires one at a time, making sure not to shock yourself! Quote Link to comment Share on other sites More sharing options...
Moredumb Posted July 19, 2007 Author Report Share Posted July 19, 2007 No fans are off when fuses and relays are pulled ,I just did that in case of feedback or bad ground. On the OBD 1.5 subject , I have checked codes before this with paper clip on A&B. I don't remember fans on when I checked codes in the past year, I had a bad EGR then. I don't have VIN handy but I will give you last digits. I can tell you vehicle built in June of 93 and when buying anything engine related I have tell them it's a 94 or it usually wrong part. First time I had a problem was with a power steering line. Quote Link to comment Share on other sites More sharing options...
Crazy K Posted July 19, 2007 Report Share Posted July 19, 2007 hmm. a remaned ecm might not be programmed. that confirms they were obd 1 then. HOT DOG! time to look for a 93 3100 pcm! do the spark test... if you wish to keep the VIN private, you can send me a PM. Quote Link to comment Share on other sites More sharing options...
shyguy164 Posted July 19, 2007 Report Share Posted July 19, 2007 Yeah, like Crazy K said, fans coming on are normal. When I check my spark plug wires, I get a red spark cause my wires are red Quote Link to comment Share on other sites More sharing options...
1990lumina Posted July 19, 2007 Report Share Posted July 19, 2007 I'm willing to bet you have little to no spark, as you said there is fuel. Most likely something ignition related has failed. Quote Link to comment Share on other sites More sharing options...
Moredumb Posted July 19, 2007 Author Report Share Posted July 19, 2007 I put on junkyard ECM today same mil problem.Checked spark ,it has strong spark on all wires. Actually I should have mentioned it sometimes acts like it wants to start, today it fired for about 5 or so seconds. Then nothing, unless it sits a hour then same thing , fires like it wants to start and I checked spark after it fired , still great. I did try starting fluid after the no fire and it fires for a momment just like after it sets.I'm going to see if I can get to one of the injector conectors so I test for signal , but they all appear to covered by top of plenum. Quote Link to comment Share on other sites More sharing options...
19Cutlass94 Posted July 19, 2007 Report Share Posted July 19, 2007 youll need to take the plenum off to test the injectors. When your testing for the signal, also ohm test the injectors. Quote Link to comment Share on other sites More sharing options...
Crazy K Posted July 19, 2007 Report Share Posted July 19, 2007 youll need to take the plenum off to test the injectors. When your testing for the signal, also ohm test the injectors. x2. what did the j/y pcm come out of? Quote Link to comment Share on other sites More sharing options...
Moredumb Posted July 19, 2007 Author Report Share Posted July 19, 2007 Junkyard ECM is from 94 cutlass. I tested for injector pulse it has it for a few cranks then loses it. I let set and it has pulse again for a few cranks.Always has 12 volt in injector plugs when key is on even if no pulse , ecm quits grounding them for some reason with any ECM I use. Quote Link to comment Share on other sites More sharing options...
Crazy K Posted July 19, 2007 Report Share Posted July 19, 2007 hmm. I would ohm check the injectors. maybe one shorted out? Quote Link to comment Share on other sites More sharing options...
Robby1870 Posted July 19, 2007 Report Share Posted July 19, 2007 Do you have a tach? If so, what does it do while cranking? Quote Link to comment Share on other sites More sharing options...
Moredumb Posted July 19, 2007 Author Report Share Posted July 19, 2007 I forgot I did ohm injectors they all zero out. Tach is fine when cranking maybe 5 or 600 during cranking. Quote Link to comment Share on other sites More sharing options...
BXX Posted July 19, 2007 Report Share Posted July 19, 2007 I forgot I did ohm injectors they all zero out. Tach is fine when cranking maybe 5 or 600 during cranking. Umm, Zero Out??? They should be at least 13.5-15.8 ohm Quote Link to comment Share on other sites More sharing options...
rockfangd Posted July 20, 2007 Report Share Posted July 20, 2007 wait can he use a ecm out of a 94 . alos the injectors should definatley have resistance, also check the timing belt Quote Link to comment Share on other sites More sharing options...
BXX Posted July 20, 2007 Report Share Posted July 20, 2007 wait can he use a ecm out of a 94 . alos the injectors should definatley have resistance, also check the timing belt 3100 doen't have timing belts... And a person would know when the chain breaks Quote Link to comment Share on other sites More sharing options...
rockfangd Posted July 20, 2007 Report Share Posted July 20, 2007 most of the time. lol well the timing chain has t obe one of the only things i havent had to tackle on a 3100 but it is a relief to know it is a chain rather than a belt Quote Link to comment Share on other sites More sharing options...
19Cutlass94 Posted July 20, 2007 Report Share Posted July 20, 2007 Its very rare that a timing chain will break. more than likely if the problem is timing related it will be the crank position sensor Quote Link to comment Share on other sites More sharing options...
rockfangd Posted July 20, 2007 Report Share Posted July 20, 2007 x2 Quote Link to comment Share on other sites More sharing options...
Moredumb Posted July 20, 2007 Author Report Share Posted July 20, 2007 I am going to get crank sensor tomorrow at the dealer if I can, the local auto parts have them one is for older GenII 3.1 nothing like mine and the one that looks like mine has 3 wires instead of 2 like mine. I also asked for one for a 94 ,that's the same 3 wire as the 93 sfi.Besides the original lasted this long, some the aftermarket sensors are junk.Also the injectors due have the correct resistence when I changed ohm meter settings. Quote Link to comment Share on other sites More sharing options...
Robby1870 Posted July 20, 2007 Report Share Posted July 20, 2007 If the tach is working, the crank sensor is working since the ICM (where the tach gets its signal from) is getting a signal from the crank sensor. Quote Link to comment Share on other sites More sharing options...
Moredumb Posted July 21, 2007 Author Report Share Posted July 21, 2007 Well it runs now. I replaced crank sensor ,no difference. I also picked up cam sensor even though I read somewhere it would still run if it was bad, in a limp in mode.However it fixed lost injector pulse problem.Just for kicks I tried the 94 junkyard ECM it runs just the same as original.Didn't try to pull codes it's late I will try later.Maybe what I read was for a different generation 3.1 engine. Quote Link to comment Share on other sites More sharing options...
Crazy K Posted July 21, 2007 Report Share Posted July 21, 2007 Well it runs now. I replaced crank sensor ,no difference. I also picked up cam sensor even though I read somewhere it would still run if it was bad, in a limp in mode.However it fixed lost injector pulse problem.Just for kicks I tried the 94 junkyard ECM it runs just the same as original.Didn't try to pull codes it's late I will try later.Maybe what I read was for a different generation 3.1 engine. Have you ever actually gotten the codes to flash????????? with either the original or 94 ecm? Quote Link to comment Share on other sites More sharing options...
Moredumb Posted July 21, 2007 Author Report Share Posted July 21, 2007 Yes in the last year I had EGR codes . A few years ago O2 sensor which I replaced and code came back 6 months later I just live with that it still ran fine. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.