supreme_style21 Posted June 6, 2003 Report Posted June 6, 2003 I'm reading up on the '89 GP I just bought, and I am seeing that the crankshaft sensor is a common item to go out on these. What is going to be the symptoms of this going bad? How hard/extensive is it to replace? The one I just bought dies occasionally when slowing down or backing up. I thought it was simply the fuel filter, but now that I read more, I am not so sure anymore. Quote
JS91Z34 Posted June 6, 2003 Report Posted June 6, 2003 The only symptom i've encountered with these sensors is a heat saturation problem. When the sensor gets old, the heat will be absorbed into the sensor by the oil or the block. It will cause the car to run erraticly or will stall the car till the sensor cools down enough to refire the engine. Quote
chronic139 Posted June 6, 2003 Report Posted June 6, 2003 when i had to change mine, the sensor was cracked and oil was going though the sensor and into the plug, screwing shit up. Quote
patgizz Posted June 6, 2003 Report Posted June 6, 2003 when mine went bad the car just refused to run, as the sensor was not sending the signal to the module to fire the coils Quote
Slade901 Posted June 6, 2003 Report Posted June 6, 2003 hmm oil going through the crank sensor..... I guess I need to check mine too. I have not replaced it yet since owning it for 5 years.. Quote
supreme_style21 Posted June 6, 2003 Author Report Posted June 6, 2003 Alright. I doubt it is this then. After it dies, it'll fire right back up. No waiting for anything to cool down. Quote
LukeZ34 Posted June 6, 2003 Report Posted June 6, 2003 Hmm.. That sounds like it could be part of the problem with my warm starting problem. On a warm engine, it takes a few turns of the key to get her started, but on a cold motor, it fires up right away. How much does that little sensor cost? Quote
Robby1870 Posted June 6, 2003 Report Posted June 6, 2003 When my crank sensor "went bad" the sensor itself didnt go bad, but the wire running from it had rubbed against the block and rubbed a hole in the wire and it would short out to the block and cause the motor to mess up Robby Quote
supreme_style21 Posted June 6, 2003 Author Report Posted June 6, 2003 Hmm.. That sounds like it could be part of the problem with my warm starting problem. On a warm engine, it takes a few turns of the key to get her started, but on a cold motor, it fires up right away. How much does that little sensor cost? gmpartsdirect price = $13.82 PN 10456043 Quote
92euro Posted June 9, 2003 Report Posted June 9, 2003 My mom's 91 lumina had a bad crank sensor and it would die sometimes even just coasting downhill. My uncle and grandpa replaced it and said it took the better part of a day, they had never replaced one before so someone more familiar with it may have an easier time with it. Quote
Lee Posted June 13, 2003 Report Posted June 13, 2003 The second time mine went, I was going 65 mph uphill and it sounded like the whole motor went. Huge thunk..coast..thunk, thunk, dead. I mean it felt like the motor was ripping out of the mounts. I was sure something final had happened. The first time the wife was going 25 mph on flat land and it just quit. Would restart in the morning and die in five minutes. Six years full I've had it now. Quote
gimp19 Posted June 13, 2003 Report Posted June 13, 2003 Could a bad crank sensor be the cause of the weak idle/stall condition my car has the first time I start it on a hot summer day? If so whats involed in replacing them? Quote
90gple Posted June 13, 2003 Report Posted June 13, 2003 If car won't start when hot, over 160 degrees engine temp., spray a little starting fluid into throttle body. (ECM bypasses crank pos. sensor signal under 160 degrees on my gp). If car fires up and runs, check crank position sensor for cracks in plastic sleeve around magnet after removing and oil leaking into connector b4 removing. On my '90 3.1 code t, I used 8mm mini socket and flex head mini wrench. 20 minutes r and r. A'zone $14.99 3 mo. wtty. Advance auto $16.99 1 yr. wtty. with stronger metal bracket than oem w/o metal bracket. Sometimes my car would restart over 160 degrees engine temp. but not often before replacing cps. Other symptoms- cut out at speed, mild hesitation on takeoff. Depends on how bad cps is, some break inside block, etc. Quote
Robby1870 Posted June 14, 2003 Report Posted June 14, 2003 I dont think the ECM can ignore the crank sensor signal, since it uses that to fire the ICM which fires the coils and so on Robby Quote
ismellrealbad Posted June 14, 2003 Report Posted June 14, 2003 gmpartsdirect price = $13.82 PN 10456043 that was about the price mine cost, when it went out on the 91LE. car would start and run fine, but once up to temp it would shut off immediatley and would not start till cool again. repeat process over again till fixed Quote
Lee Posted June 14, 2003 Report Posted June 14, 2003 Make sure you put a thin coating of oil on the sensor before installing. I suspect that that is why my first replacement went bad. "All Car" Chain store installed. The last one was put in by a competent guy in a small town local shop. They also did my "O" ring and that worthless potmetal fitting under the themostat. The threaded short pipe job. He threw in an IAC and throttle body cleaning no extra charge. I let another chain store shop, "Farm & Fleet," do my rear struts. They left off the dust cover tubes. Quote
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