SOURCE: Had a bad egr valve
You have a plugged exhaust, replace the catylictic converter and find out what make it fail and plug, rich fuel mixture is most common cause of overheated burnt cat. The EGR is just a symtom of the plugged exhaust.
SOURCE: 1998 GMC Jimmy, bogged down, stalled and won't sart back up
does it have spark? you did verify fuel pump working properly? could it have a clogged converter? is the engine lite on?
SOURCE: hard to start and smell gas
have 1994 4.3 cpi and the problem I had sounds same.
It was a leaky pressure line in pletium . easy fix $45.00 part $15.00 gasket.
the leak was caused from the fuel lines rubbing together in pletium.
take the vortec cover off ,then remove air regulator in middle and look inside . I turned on power to key and gas spray came from drivers side of pletium looking in hole.fuel line side. if gas spray on passanger side then gas regulator faulty. takes 5 min to check
After fixing truck runs runs great. no more gas smell in cab.
also you can smell oil for gas
SOURCE: 89 olds cutlass ciera bogging down when accelerating.
my 89 cutlass did the same thing....She would bog down ( when the service engine light came on)....Light would go off and she would run fine...Shop replaced fuel fiter and KNOCK SENSOR, runs great now, the service engine light stays off too. Ran a can of MG injector cleaner thru too.
SOURCE: I have a 1993 GMC Suburban 5.7L that bogs down and
Had the same problem with my 95, same engine as yours. It turned out the Knock Sensor was bad. It's located on the bottom of the engine block. I replaced just about every sensor I had on this truck and still did not solve the problem until I replaced this sensor. From what I understand, the knock sensor retards the timing when there's knocking of a misfire in the engine, then it's supposed to straighten itself back up when the engine cleans itself back up. When the sensor goes bad it won't realign itself and it throws the timing completely off kilter. Mine was backfiring so bad it blew the air cleaner cover right off. Since I replaced this sensor I towed a full 16' enclosed trailer for 3200 miles with no problems at all.
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