Volvo AWD 850 Forum

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iddles rough 850 1994

I have a 94 850 wagon non-turbo with an iddling problem. At first it would only hesitate a bit @ around 3k rpm's, but today it started doing it all the time after a 2hr trip. It's misfiring at iddle as well as under load. I just replaced the plugs just in case but w/o any luck. I'll be greateful for any responses!








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iddles rough 850 1994

either fuel or electrical...electrical is the easy stuff to try first (and worth doing if its been a while)

remove the distributor cap and check the rotor arm and the contacts in the cap...if they are worn or pitted, or lots of black in their or 'tracking' black spider web lines then thats a likely culprit...

if so clean it up with a cloth and clean the contacts CAREFULLY with fine sand paper and see if it get a LITTLE better if so thats your cause..if not but its badly worn change it anyway....

remove your leads and clean them with a cloth...leads should be CLEAN to work well....of course removign all your leads also means you check the connections when you put them back...

tip before removeing ANY leads number them with snopake and draw your self a diagram...

if it all looks ok get it in the dark and start it up and check for visible sparks on the outside of the leads - a sure sign of lead breakdown, mist LIGHTLY with water to aid this....

it could also be a faulty injector of course....

if in doubt replace the spark plugs, leads, rotor arm, dizzy cap...and see if it goes away...but you just spent some $








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idles rough 850 1994

No trouble codes?
--
95 854T, 88 780, 88 245, 01 A4 Audi








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idles rough 850 1994

I haven't check for any codes...I don't have the means besides the shop....that would be tomorrow. Sorry about that, but thanks for your reply!








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Magnetic valve , that have a vaccum hose connect 850 1994

go to www.volvospeed.com


log in bay13.... look under code.. it will show you how to read the code and what is wrong with the car

for 1994 you can found out easy....

good luck








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idles rough 850 1994

With a '94, you can pull codes using the diagnostic modules under the hood. If you invest in a Haynes manual, you can pull and reset your own codes. You will also be able to reset the service reminder light after you change your oil.







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