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Car Forum / Driving, Maintenance, Tuning / Maintenance and Repair / May 2007Cavalier: won't start when engine hot
'99 Cavalier, 2.2L. On warm days, with a hot engine, it won't start. After sitting a couple of hours, it's OK. When it won't start, the temp gauge is stuck on cold. As soon as this starts working, the engine starts. So, maybe a bad ECT. But, after starting, the temp guage will intermittently fail again; and, when it does, the oil, battery, and coolant alarm lights all come on. These go on and off together with the temp guage failure. (The engine keeps running.) I suspect these are also failed when the car won't start, but the lights are just on anyway, so you can't tell. The car has had wiring problems before, but I don't see where these sensors have anything in common, other than the computer (PCM). But, the engine does keep running, so it can't be totally crapped out. I hate to have to spring for a new PCM, just to find out whether that's bad. Any thoughts/experience would be appreciated. Thanks, George Bad ground someplace... > '99 Cavalier, 2.2L. On warm days, with a hot engine, it won't start. > After sitting a couple of hours, it's OK. When it won't start, the temp [quoted text clipped - 17 lines] > Thanks, > George >Bad ground someplace... I don't really like to think that - too much work. Aside from that, though, the oil & coolant level sensors are switched to ground in the fault state. So, a bad ground on the sensors couldn't cause a fault ... which pushes the problem back toward the PCM. Meanwhile, the open-circuit ECT voltage from the PCM reads OK (5v) when the temp gauge is failed. And, for that matter, the engine does run in the 'fault' state - it just won't start. But, you may well be right. Before I start looking, I'm going to hope really hard that someone else has a magic bullet. Thanks, G >> '99 Cavalier, 2.2L. On warm days, with a hot engine, it won't start. >> After sitting a couple of hours, it's OK. When it won't start, the temp [quoted text clipped - 17 lines] >> Thanks, >> George >Bad ground someplace... Well, it was a somewhat broken wire, down near the PCM. Or so it seems - it wasn't as hot today as yesterday. G >> '99 Cavalier, 2.2L. On warm days, with a hot engine, it won't start. >> After sitting a couple of hours, it's OK. When it won't start, the temp [quoted text clipped - 17 lines] >> Thanks, >> George hi therei vote for either ignition module, or for temp sender for the ECM, or possibly the crank sensor all of which commonly fail and can/do cause this symptom will have to rule each one out independantly the module can be tested at almost any parts store for free the sensors are cheap and i would replace the crank one regardless they are very common to fail good luck > '99 Cavalier, 2.2L. On warm days, with a hot engine, it won't start. > After sitting a couple of hours, it's OK. When it won't start, the temp [quoted text clipped - 17 lines] > Thanks, > George |
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