My 350 92 chev suburban has a rough idle and backfires and bogs under load the thing has became undrivable, I have just put on a new tbi, coil, dizzy cap and rotor button, I have timed it but still with no joy please can anyone shed some light on the issue, oh and I have put a new fuel filter in as well.
Mine did the same thing, I replaced the coil and the fuel pump at the same time - problem solved, but since I put them both in at the same time, I don't know which one actually fixed it. Start with the cheaper of the two, or even get a coil at the salvage yard. Hope it helps, I was going nuts as well.
Sound like problem could be vacuum leak at intake.leaking egr valve or leaking engine valves.slip timing chain timing is off.
Try driving it with the vac line off the egr valve. Was the ignition timing off?
Hello
The engine
and transmission in this cars drive train are fully
electronically controlled by a computer called the PCM (Power Train
Control Module). Whenever a problem like this occurs the computer
stores a record of the problem (there are of course some exceptions
to this, like the fuel pump, engine coolant temperature sensor and
MAF sensor for instance) in the form of a fault code in its memory,
to read these fault codes you must have the systems memory scanned
with a special tool. Once the fault code(s) are read you then must
perform the appropriate diagnostic testing to find and resolve the
problem(s) DO NOT REPLACE ANY PARTS UNTIL A TRAINED TECHNICAIN
HAS DIAGNOSED THE PROBLEM TO AVOID SPEDING YOUR HARD EARNED MONEY ON
PARTS THAT MAY NOT CORRECT THE PROBLEM
http://technoanswers.blogspot.in/2012/02/nissan-pathfinder-stalls-and-bucks-on.html
-----------
Nissan Pathfinder Backfires?
http://technoanswers.blogspot.in/2012/02/nissan-pathfinder-backfires.html
---------How to adjust rpm?
http://schematicsdiagram.blogspot.com/2011/12/how-to-adjust-rpm-on-2009-dodge-charger.html
------------Engine cuts out at 3000
RPM?
http://schematicsdiagram.blogspot.com/2011/12/engine-cuts-out-at-3000-rpm.html
----------This will help.Thanks.
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The timing was ok, I just put a gun on it to be sure, I will try removing the vac line off the egr valve. If it dose inprove what will that mean? thanks for your time
just tried removing the vac line off the egr valve although the truck was cold it was backfiring more than ever
Still running bad back firing constantly, the next thing I will try is installing a new fuel pump once I get one from the states as I am in Australia. Thank guys for your input keep them coming I need this think fixed soon. stress
no I don't have a fuel pressure gauge to test the pressure going into the tbi, yes it was backfiring before I replaced the cap and rotor but not as bad, it dosn't seen to be popping up thru the throttle body only when I am trying to start it once it is going it backfires out of the exhaust, again thanks for your input I hope I/we can solve this problem, the truck has been a nightmare since I brought it.
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