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rough idle stalling when warmed up .....not the harness help

hello fellow volvo fans ....i am having troble with my 85 740 ...that has been owned by my mother since new...

car had been sitting for some time after stalling on the highway last year

after stalling it would not start up .. i had it towed home and i tried to start it up 2 days later ... it started up fine but ran a little rough ... it then sat for 6 months ... when i recently tried to start it up (last week) it would not turn over ..i then checked the plugs ..they where black (somewhat fouled i guess) i have replaced them ..after replacing the plugs and charging the battery she started up no problem .....while taking a test drive that same day she stalled on me again ...and would not restart

after sitting for aprox 10-15 mins she turned over quick ..then 1-2 minutes into driving she stalled again ...again car would not start ...i let her sit for another 10 mins and she started no problem... this then happened the same way 2 more times untill i finally got her home... where i let her idle in my driveway
5-10 mins later she finally stalled while idling.....

please help i dont know where to start????

Jack








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    rough idle stalling when warmed up .....not the harness help 700 1985

    While I'm wondering how you came to the conclusion that it's not the harness...

    It sounds like it needs a couple of things. Idle speed regulation is a problem if the throttle body is dirty. This can prevent the TPS (throttle position switch) from closing. Buy a throttle body gasket ($1) and a can of carb cleaner, remove the three 13mm nuts, vacuum lines and electrical connection and clean it thoroughly.

    The plugs are probably fouled again. You could have a failed fuel pressure regulator making high fuel pressure, therefore a rich mixture, or the engine coolant temp sensor (ECT) could be bad. Then it runs as if the choke is on, very rich, fouls the plugs. And this problem could definitely be wiring harness related. A broken or corroded wire causes high resistance, same as a failed sensor and the same as "VERY COLD" according to the sensor circuit.

    Good luck!
    --
    Rob Bareiss, New London CT ::: '87 244DL/M47- 229K, 88 744GLE- 218K, 82 245T-181K Also responsible for the care and feeding of: 88 745GLE, 231K, 87 244DL, 239K, 88 245DL, 246K







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