1996 Volvo 850 Q&A
1996 Volvo 850 Question: Intermittent Fault - THROTTLE LOPING when Driving. Revs up to about 1900rpm.
Sometimes Throttle Loping ceases when Auto shifted into Neutral (while driving along); sometimes requires engine to be Shut Down. One one [the worst] occasion, Engine wouldn't re-start when Drive engaged, unless throttle was revving up before pulling into Drive. Dangerous when Volvo_850 accelerating/Loping windy-downhill on brakes, and needing to turn off to kill Loping !! - 2602_850
Hi, There are many possible explanations for this. My first choice would be the air mass meter is beginning to fail. You might try cleaning it, and cleaning the throttle body at the same time. Any DTC's? If so, which ones. 2nd guess would be weak oxygen sensor. Good luck with this, Andrew - Andrew G
Sounds like a vacuum leak to me, check the cold air hose from mass air meter to throttle body for cracks. Cracks may not be visible unless you remove the hose. - ccsmog