1st Gen S-series (1983-1994) Tech Discuss 1st generation s-series (1983-1994) general tech topics here.

High idle, backfire/miss

  #1  
Old 10-20-2007, 01:11 PM
Thread Starter
Join Date: Oct 2007
Posts: 1
pokerface is an unknown quantity at this point
Default High idle, backfire/miss

RE- 86-2.8 TBI,
Drove to the airport & left the truck for a week. When I started it upthe engine wasmissing a little, not too bad. However when I hit the freeway and 4th gear (automatic) the miss became a full blown coughing with an occasional obvious backfire. The problem is not noticable during idle or at high RPM, only when it's under a load. The RPMsat idle are running very high, even after operating temp is reached. I should point out the just prior to this my I left my key on over night and it needed a jump. However I drove 80 mileswithout any problem before parking it for a week.

Any advise would be appriciated!

 
  #2  
Old 10-20-2007, 01:27 PM
Join Date: Oct 2007
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Blaze GM4 is an unknown quantity at this point
Default RE: High idle, backfire/miss

Is your truck fuel injected? i figure it's fuel or spark, how does the underside of your dist. cap look?
 
  #3  
Old 10-20-2007, 01:39 PM
Join Date: Jan 2006
Posts: 2
Jim C is an unknown quantity at this point
Default RE: High idle, backfire/miss

IF YOU HAVE A MISS UNDER LOAD; THIS USUALLY POINTS TOWARD IGNITION (IE: SPARK PLUG WIRES/ SPARK PLUGS DISTRIBUTOR CAP AND OR DISTRIBUTOR ROTOR.
A MISS AND HIGH IDLE, WILL ALSO CLUE ME IN AS AN ENGINE VACUUM LEAK.
Last but not least; If you're vehicle sat,Condensation could have built up in the gas tank and you may just need to run this tank down to around a 1/4 tank and refill to full and change the fuel filter.
Hope this helps and sorry about all caps up there
 
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