Hello my 1993 240 at idle seems to now shake and rattle more than ever before. I've read that it could need a Throttle Body cleaning?

Any other recommendations? Is throttle body cleaning a DIY?

Any information would be great.

Thanks

Trevor

 

Id start with a good injector cleaning.

Sounds like a good basic tuneup is in order too

 

when was the ignition system last R&R'd (new plugs, rotor, distributor cap, and if needed, spark plug wires?)

does the engine hold a steady idle once warmed up? with your foot on the brake, if you shift from P or N to D or R, do the RPMs stay fairly constant after a brief dip, or does it lug and stumble when stopped in gear ?

idle problems can be caused by the throttle position idle switch not being properly adjusted, a gummed up throttle body not fully closing, a gummed up idle air control valve, or random vacuum leaks. see https://www.volvoclub.org.uk/faq/Eng...#Idle_Problems for a variety of tests and such.

also, it might be the engine mounts (and the transmission mount, which is in effect the third engine mount). these are 25+ year old cars, those mounts are rubber and rot with age and oil spills.