Question about 1990 Volvo 740

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Rough idle in 740 1990 Volvo Smooths out a bit when driving

A very well kept 740 1990 Volvo 141,000 km After purchasing discovered it ran a wee bit rough, especially when idling. We did get codes checked, but didn't indicate the problem. Thanks for help to smooth out our beautiful car.

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When it idles rough it could be several things but, an easier thing you can do 1st is cleat the throttle body of any carbon(black stuff) with throttle body cleaner or something like carb cleaner. Ive used brake cleaner sometimes. But yea, look up your cars info about your motor and just clean all the black carbon off of anything at the throttle body and you may even need to take some of it apart to get down in there with a rag, little cleaning brush and the cleaner. Clean the thing you can move by hand called a "butterfly".

Posted on Jan 03, 2014

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Posted on Jan 02, 2017

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SOURCE: 76 volvo 240 car idles and low speed is rough,

It could be the filter. Has the fuel been changed after storage? I would also thing the Carburetor or the fuel injectors might need to be cleaned.

Posted on Dec 19, 2008

  • 2 Answers

SOURCE: volvo 240 1991 stalling

Check the emmisions box, loacted nr starter in the block, take it out and clean it, or replace it with a new one.

Posted on Aug 28, 2009

  • 1 Answer

SOURCE: 1997 Volvo 960 6 cyl

Check wiring harness to fuel injectors where it runs through intake manifold - these chafe through and cause injectors to stay on or off. Also check engine grounds. 2 at back of head near firewall and one at drivers side engine mount (almost impossible to see)

Posted on Dec 15, 2010

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