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740 low idle, pumping brakes increases revs

Help, Advice, Owners' Discussion and DIY Tutorials on all Volvo's "mid era" rear wheel drive Volvos.

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Stetson
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Stetson

740 low idle, pumping brakes increases revs

Post by Stetson » Thu Apr 23, 2020 11:31 pm

I've got a 1990 740 with the B230F and after a cold start the revs stay a bit too low on idle. Something like 500rpm. If I pump the brakes the revs get up to where they are supposed to. When I stop the pumping the revs go back down.

Any ideas what could be causing this?

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volvolugnut
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volvolugnut

Re: 740 low idle, pumping brakes increases revs

Post by volvolugnut » Fri Apr 24, 2020 10:03 am

I suspect a vacuum leak in the power brake system.
vololugnut
2001 V70 T5, 1986 244DL, 1983 245DL, 1975 245DL, 1959 PV544, multiple parts cars.

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