Volvo RWD 700 Forum

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88 740 wagon: Idle surge 700

posted by mrwood on Mon Jun 29 22:54 CST 2009
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last visit: Sat Sep 12 22:11 CST 2009

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A new situation is that my idle is hunting around when starting. I'm getting more and more of a high idle condition,RPM varying, when I start up, and some brief power surges and hesitation, randomly, when driving.

Do these symptoms point to a likely cause?

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88 740 wagon: Idle surge 700

posted by fixit2002 on Tue Jun 30 08:03 CST 2009
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last visit: Fri Jul 24 10:30 CST 2009

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Check the fuel pressure regulator vacuum line for signs of gas leakage. Check for manifold and intake system air leaks. Maybe try some MAS cleaner and reseat the MAS plug.

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88 740 wagon: Idle surge 700

posted by mrwood on Wed Jul 1 23:40 CST 2009
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last visit: Sat Sep 12 22:11 CST 2009

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It was the MAS plug. (The air sensor coming off of the air cleaner box.) Reseating the plug fixed the surging. It was partially seated, and the wire bail was dislodged on one side.

Thanks.

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