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Trouble restarting car after warmed up.

(1990 Oldsmobile Cutlass Ciera)
in Nevada, MO on January 16, 2011
Car starts fine when cold.After idle drops,then idles low and oscilates.Then trouble starting when after shut off.Where is the crank sensor located ? Please help.A little ol' lady
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Popular Answer
on January 16, 2011
I am thinking more of an air intake problem or possibly fuel pressure problem over a crank sensor issue. The throttle body could need cleaned. The idle control valve could be sticking. There could be a vacuum leak somewhere at the engine intake or a PCV hose issue. These are places I would begin looking. Good luck...
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on January 16, 2011
I am used to older vehicles.Is there an Idle adjustment on the throttle body or is it all factory set?
on January 16, 2011
I am not specifically familiar with your vehicle, but i can tell you that I would not mess with it, as it has not changed and should not be used as a way to mask another real problem.
on January 17, 2011
thank you.This makes sence.It seems to be a sensor.It shuts down abruptly and then doesn't restart until sitting for a while.. I owned a nissan that did this. turned out to be the voltage modulater.This car does not have a rotating distributer though.So where would this be located?.please help.
on January 17, 2011
The dual crankshaft sensor is located near the harmonic balancer at the bottom of the engine (where the crankshaft is). The design of this ignition system does not require a separate camshaft position sensor.

Whereas this sensor COULD be your failure, it is not proven by any means. You also, for example, have an ignition module in play that could be causing some problems.

Really, the best suggestion I have is to have the car checked! You possess enough information now to make sure you can keep them honest, and hopefully you can find a good trustworthy technician and shop near you.
on January 20, 2011
replaced ignition module. ran for quite awhile, 20 minutes then died. the car is too old to have it checked out on a machine. any other thoughts. thank you for your help.

has new fuel pump, tune up, air and fuel filters, vacum hose replaced, and O2 sensor plus the ignition module
on January 20, 2011
Just an honest question - what did you pay for the ignition module?

I think there is a fallacy here about what is expected from a diagnosis. What I'm suggesting you have a technician first hand look at the vehicle to find out what component has failed. If you add up the money spent on the fuel pump, tune up, air and fuel filters, vacuum hose, oxygen sensor and ignition module - you could have more than paid for the diagnosis probably twice or three times.

Everything I'm doing is an educated guess. Keep in mind that the dual crankshaft sensor is what I anticipated to be failed.
on May 28, 2011
Sounds Like a coolant temp sensor went bad. Car runs fine until warm then the computer tries to adjust the fuel mixture but is getting an incorect reading from the temp sensor. The engine is probably running rich when this happens and will take awhile before it can be restarted.
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