Mechanics

SUGRING

1988 Volvo 740

Engine Performance problem
1988 Volvo 740 4 cyl Two Wheel Drive Automatic

My problem is this, after 10-15 minutes the car starts to jerk/surge/sputter at idle and while driving, the tac jumps and quickly drops back to normal every second or two, it seems to stop while driving if I let off the throttle and then returns if givin more gas or goes back to idle. Only breifly would this symptom stop and the car would run smoothly ( maybe 5 seconds or more) and then of course the problem returns right away. Also it seems to have a small hesitation starting from a stop. This started to happen on the highway between the speeds of 50-60/65, ONLY, and would stop before or after those speeds. Also I may have a bad head gasket if that helps any, I assume that because I have a slight light brown oily color, but no other symptoms concerning that. New: distibutor, fuel pumps, fuel realy, ignition relay, air mass meter, air control valve. Plugs cap and rotor. I just set the timing back to 10 btdc was at about 13. Thanks.
Avatar
Noggee
May 26, 2009.



Check out the related content below while we wait for the question to be answered by a professional mechanic.