1995 Pontiac Bonneville

1995 PONTIAC BONNEVILLE
67,000 MILES • 6 CYL • FWD • AUTOMATIC
Avatar
ELTAY3
  • MEMBER
  • 1 POST
Engine began dropping cylinders under light load in OD at about 1,500 to 2,000 RPM. Has slowly gotten worse, to the point that it rapidly cuts in and out in OD, necessatating using D. It will not run cleanly at highway speeds, worse in Cruise Control. My sense is that it is an injector problem, but gas additives do not seem to help.
Apr 16, 2010 at 8:50 PM
Advertisement
Avatar
MERLIN2021
  • CAR REPAIR CONTRIBUTOR
  • 17,250 POSTS
Start with the basics, and work your way up, Last tune up was? Wires plugs ALL filters? If all that is ok, check for a stuck EGR, then test fuel pump pressure, If it won't restart, determine what's missing, the engine needs three things to run, Spark at all plugs, gas to all cylinders, and compression in all cylinders, tho an engine may run lacking one in one cylinder, it won't run very well!
https://www.2carpros.com/car_repair_video/test_fuel_injection_pressure.htm
Go here and checkout our video.
https://www.2carpros.com/car_repair_video/test_engine_ignition_system.htm
and this one!
https://www.2carpros.com/dia/how_to_check_compression.htm
Is the service engine soon light on?
Apr 17, 2010 at 10:58 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.