need help- missing and backfiring
Thread Starter
4th Gear
Joined: Oct 2007
Posts: 4
Likes: 0
need help- missing and backfiring
I have an 88 which was running great up until 2 weeks ago. Now it starts good and idles decent. Good pick up with no misses. As soon as you are going with no load and the rpms are above 1600 the car starts to miss. If you back right off the gas it will backfire. I have changed the wires and plugs. I also checked the main cat as I thought it may be plugged and causing too much back pressure.
thanks, Selma
thanks, Selma
Drifting
Joined: Sep 2003
Posts: 1,363
Likes: 7
From: 1994 LT1 Coupe 6-speed with FX3 & 2000 LS1 Vert 6-Speed with F45 Hunterdon County, NJ
Has any work been done to the car in/around when it started acting-up (e.g. oil change/air filter change, etc??).
Backfiring could also be caused by a loss of vacume or intake leaks. Are any hoses off or cracked.
Suggest carefully looking over all the intake and vacume hoses to see if any thing looks amiss.
Also try listening to see if you hear any hissing noise from around the engine or under the dash.
Backfiring could also be caused by a loss of vacume or intake leaks. Are any hoses off or cracked.
Suggest carefully looking over all the intake and vacume hoses to see if any thing looks amiss.
Also try listening to see if you hear any hissing noise from around the engine or under the dash.
Le Mans Master
Joined: Jul 2007
Posts: 5,043
Likes: 8
From: Tampa Florida
Thread Starter
4th Gear
Joined: Oct 2007
Posts: 4
Likes: 0
I have not had any work done to it. The problem came on very sudden. It had not caused any engine codes. The backfires seem to be intake. I have not yet replaced the dist cap yet but will be doing so tommorrow. My big fear is a head gasket but the fact that it does not happen under load kind of suggests not.
thanks
thanks
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