I have a 1992 940. It has driven for years with no issues. A few weeks ago the idle started running up to 3500 RPMs in park and neutral. The engine runs a normal idle in reverse, drive, low 1 and low 2. However, it runs rough in drive, backfires etc . . .

Has anyone else seen this before?

Engine Codes are as follows:
Bank 'A' Socket 2 = 321, 221, 121
Bank 'A' Socket 6 = 111
Bank 'B' Socket 3 = 122

Thanks in advance,

The Sweedish Wrench

 

Head over here:
http://www.volvoclub.org.uk/faq/Engi...tionFaultCodes

Regards, Andrew.