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4.3 engine misfire


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jeeepster
Anonymous Poster

May 14, 2009, 1:15 PM

Post #1 of 4 (2136 views)
4.3 engine misfire Sign In

I have a 1996 4.3 engine installed in a1989 jeep wrangler. Engine, tranny, wiring harness came out of a wrecked gmc truck. Engine misses when under load except at full throttle. I can disconnect neg. battery cable for a while reconnect it then start it up it will miss for a mile or two then suddenly smooth out (sometimes it backfires). It will run fine until I kill it then it will start missing again. Parts changed:fuel spyder, computer, TPS, temp control sen, thermostat, both upstream o2 sen, map, iac, Crank pos sen, egr, coil, icm, dist, cam pos sen,


Loren Champlain Sr
Veteran / Moderator
Loren Champlain Sr profile image

May 14, 2009, 3:09 PM

Post #2 of 4 (2133 views)
Re: 4.3 engine misfire Sign In

I know I may be opening a can of worms, but what are you using for a fuel pump? What kind of pressure readings are you seeing? The Vortec V6 needs at least 55-60psi to just run.
Loren
SW Washington


Guest
Anonymous Poster

May 15, 2009, 10:45 AM

Post #3 of 4 (2129 views)
Re: 4.3 engine misfire Sign In

I forgot I changed fuel pump and filter. It runs between 58 & 66 psi by a guage.


Loren Champlain Sr
Veteran / Moderator
Loren Champlain Sr profile image

May 15, 2009, 4:21 PM

Post #4 of 4 (2121 views)
Re: 4.3 engine misfire Sign In

Guess I'll just use the worms for fishing.Unsure
Loren
SW Washington






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