HELLO, IVE GOT A 94 850 TURBO THAT WAS RUNNING PERFECT, THEN ONE MORNING WHEN I STARTED IT UP IT REVED PRETY HIGH FOR A FEW SECONDS THEN WENT TO NORMAL. IT ALSO DEVELOPED A SLIGHT MISS AT IDLE. THE ENGINE LIGHT CAME ON A FEW DAYS LATER SO I CHECKED THE CODES AND A TON OF THEM CAME UP. THE CODES WERE 514,545,555,225,543,451,452,455,232,512. I HAD JUST REPLACED THE AC COMPRESSOR A WEEK AGO. DID I PULL A HOSE OR LINE FREE IN THAT AREA? ANY HELP WOULD BE GREATLY APPRECIATED. THANKS

 

Which ports did they come from?

 

I PULLED THE CODES FROM A2. THANKS

 

The Majority of those codes are Missfire codes.
Has it had a tune up lately?
http://www.troublecodes.net/Volvo/
Also check out that site for the Codes.

If you look at the Wires from the Dist. If they are Volvo look for either White or Yellow Numbers stamped on the wires. That is the Date they were made.

 

THANKS FOR THE INFO. WHAT WOULD CAUSE THE ENGINE TO REV UP AT STARTUP LIKE IT DOES. IT REVS PRETY HIGH FOR ABOUT 5 SECONDS THEN IDLES DOWN. ANY GUESS?

 

Exactly what RPM does it go to?

If the codes are still stored in the system then the Computer might be doing it.

 

IT WILL REV TO ABOUT 2000 TO 2300. I HAD CLEARED THE CODES ONCE ALREADY. ANY IDEAS? THANKS

 

It will usually rev to about 1500 or 1600 on start up but that seems to high.

Any Vaccum leaks at all?