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1995 Pontiac Bonneville

Tiny
ELTAY3
  • MEMBER
  • 1995 PONTIAC BONNEVILLE
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 67,000 MILES
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.
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Friday, April 16th, 2010 AT 8:50 PM

1 Reply

Tiny
MERLIN2021
  • MECHANIC
  • 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?
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Saturday, April 17th, 2010 AT 10:58 AM

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