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Old 05-16-2007, 06:02 PM   #1
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Default 89 stalling out

Original problem - car stalling out at no particular time. Code 42 - replaced cam sensor - no change. Replaced iginition module - no change - but now check engine light and high temp light blink together, car stalls. Will not start again until lights stop blinking. Disconnected coolant sensor - will not start. Gage reads 180 deg. Is this sensor bad, will it stop the car from starting until it "cools down"? thank you - doug
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Old 05-16-2007, 07:21 PM   #2
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Default Re: 89 stalling out

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Originally Posted by dd4d4c3
Original problem - car stalling out at no particular time. Code 42 - replaced cam sensor - no change. Replaced iginition module - no change - but now check engine light and high temp light blink together, car stalls. Will not start again until lights stop blinking. Disconnected coolant sensor - will not start. Gage reads 180 deg. Is this sensor bad, will it stop the car from starting until it "cools down"? thank you - doug
It'* possible you have an ECM or ground problem. Anytime you start getting funky readings that you can verify are incorrect (Like engine over-temp when the engine isn't over temp, start looking for ground connectors that need cleaned and reseat wiring harness connectors. And of course, check the actual sensors.

And at no time will an over-temp prevent the car from running. You can run them over temp till they boil over and puke coolant (not advisable, but possible) The lamp is just a warning light. The erratic nature of it is setting off little warnings in my head that you have a wiring or ECM problem.

BTW, Junkyard Type 253 ECM'* are pretty cheap and easy to come by at the moment. If you can spare a few bucks, it wouldn't hurt to have one in the kit of spare parts. I'm not saying yours is bad, but swapping one out is a quick test to see if the brain box has taken a dirt nap. (You are going to be under the dash anyways to reseat the harness connector to it, no harm in swapping the complete unit.)
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Old 05-19-2007, 11:32 PM   #3
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Default 1989 Bonneville stalling

You were correct, the ECM was bad. Brought a junkyard ECM, swapped PROMs, runs great. Thank You
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Old 05-20-2007, 02:08 AM   #4
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Default Re: 1989 Bonneville stalling

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You were correct, the ECM was bad. Brought a junkyard ECM, swapped PROMs, runs great. Thank You
Cool, happy to help
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