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> Surging/Stalling '86 740
Ollieboy
post Mar 11 2005, 01:48 PM
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I've got an inconsistent problem of surging and stalling with my '86 740 (non-turbo). I'm low on cash, so as much as I'd like to throw new parts at it, I have to hold out until some definitely breaks, or I can diagnose the problem. Sometimes it stalls on takeoff from a stop, and sometimes it surges at stop, or at steady highway speeds. Fuel pressure regulator? TPS or Mass Air Meter? EGR? Is there a way to test before replacement? Thanks in advance for any help!

Ollieboy
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Tech
post Mar 11 2005, 03:57 PM
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The first thing I would do is clean the throttle body and idle motor first.
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Ollieboy
post Mar 11 2005, 09:22 PM
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I'll give it a try, fingers crossed. Thanks
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Tech
post Mar 11 2005, 09:37 PM
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Let me know how you make out.Most of the time that is the problem.
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Ollieboy
post Mar 11 2005, 10:22 PM
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I'll get right on it. Thanks again.
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Ollieboy
post Mar 14 2005, 10:00 AM
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Cleaned quite a bit of gook out of the TB and as much as I could reach out of the manifold without removing it, and the idle motor didn't look too bad, but sprayed it out good. The wife says it seems better, we'll see, I guess. BTW, what does the coolant temp sensor have to do with idle and driveability? I/ve seen it referred to in other posts. Thanks a lot for help, and I'm sure it won't be the last time I ask for it!
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Tech
post Mar 14 2005, 01:05 PM
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The coolant temp sensor has to do with the engine computer and fuel delivery.When the car is cold it gives the engine more gas.When it is warm it gives less.
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Ollieboy
post Mar 14 2005, 06:16 PM
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OK, the coolant temp sensor must be fine then. The guage reads what it should, and it starts and idles OK. My wife has had zero problems today, even in heavier than usual stop and go traffic. Hopefully that's the end of it. Thanks for your info. :grin:
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Tech
post Mar 14 2005, 07:23 PM
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No problem anytime.
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