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Old 10-23-2011, 09:59 PM
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ignition problem

1990 suburban,
I have a puzzeling problem. my suburban runs about 10 minutes the dies as if the ignition has been shut off.

I have checked and replaced the pick up coil , ignition module, coil and ecm.

distributor cap ,and rotor. even after all that it runs about 10 minutes and dies, with no fire. After a couple of hours it will start and run for abou 10 minutes and die.

I would appreciate any input (insite) to this issue.

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Old 10-24-2011, 01:10 AM
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Possibly your Ignition switch is worn out causing the problem. Contacts may be connecting again after they cool.
Many newer Burbs & Trucks have this problem.
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Old 10-24-2011, 03:21 PM
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This truck used an engine OIL PRESSURE SWITCH to power the fuel pump after starting.
It may be a case where the OPS activates OK but when the engine oil gets hot the pressure drops a deactivates the OPS thus stopping the fuel pump.
Or the OPS is bad.
It's easy the test. Run a jumper from the battery + to the "fuel pump prime" test terminal under the hood near the relay box.
This terminal is for testing and priming only. It is unsafe to leave the jumper in place.

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Old 10-24-2011, 09:43 PM
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Quote:
Originally Posted by tlc568
after all that it runs about 10 minutes and dies, with no fire.
When you say 'no fire' does that also mean 'no spark'? Might want to check and isolate this as a fuel or spark issue.
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Old 10-25-2011, 04:36 AM
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no spark

yes there is no ignition spark.
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Old 10-25-2011, 06:57 AM
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You have already done the expensive wholesale replacement of parts. It is time to dig out a meter and find the issue. Get a wiring diagram and track down the issue before you spend any more money.
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