I recently bought a used 94 850 turbo with 112000 miles...cars acting weird now, engine shakes sometime...seems to bog off a take off...at wot the car will sometime seem to have no power, then it'll lung forward like it has power.....car also falls flat on its face at 4 or 5k rpm then pull again after that...wen it hesitates at 4 or 5k I can feel the engine shake....I need help, can't seem to figure it out

 

Scroll down on this link to the routine tune up items and start from there also retreive the codes from the obd1 port.

https://volvoforums.com/forum/volvo-...s-s-v70s-9266/

 

got the engine light on? check the codes.

could be vacuum leak. could be plugs/wire/cap/rotor.

when i 1st got mine it was sluggish on take off...and then at 3-4k rpms it would studder (when boost came on) plugs/wires/cap/rotor fixed the issue for me. Studdering can be a misfire issue. And not making power when the boost comes on can also be misfire...or engine running rich....or turbo not making proper boost.

Get the codes.
check over the plugs/wires/cap. look for cracks ect. if they seem old, just replace them. Itll run you $150 for those parts, but its a worth while tune up even if it doesnt solve your problem.
Look over vacuum hoses. There are plenty of them under the hood, but even 1 missing/broken will cause plenty of issues.
What does your boost gauge do? If it stops building boost early then that can be a clue a tuneup is needed.

 

+1 With Gaby.

 

There's no check engine light ... I replace the spark plugs *problem remain*...I pulled the wires n OMG one of them had cobwebs on it lol..I'll try what nitrosport says and replace the cap,rotor n wires...if that don't work I'll get back to you guys...thanks *and one more problem, my boost gauge is stuck in the middle, I bought it that way...never got around to fixing it, so I have no idea if I'm actually getting full boost*

 

Try doing this. https://volvoforums.com/forum/volvo-...working-29883/


Theres a sticky for DIY repairs that helps a lot

https://volvoforums.com/forum/volvo-...repairs-26114/

 

K thanks

 

Lol