where to start....
Thread Starter
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Elder User
Joined: Sep 2000
Posts: 936
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From: Bay area
where to start....
hello. I have a 85 bronco which had the 300ci 6 in it. it decided to loose a wrist pin.
so I have swapped it out with a 302 which came out of a 85 f150 4x4.
now my problem. when I push the 302 past the 4 grand mark. and let off in nuetral she will back fire thru the exhaust.
edelbrok performer intake with a 600cfm holley. have varried the timing from 4 degrees to 8 without any change.
other than the back firing it runs like a top. the engine was from my brother with 13k miles on it
so I have swapped it out with a 302 which came out of a 85 f150 4x4.
now my problem. when I push the 302 past the 4 grand mark. and let off in nuetral she will back fire thru the exhaust.
edelbrok performer intake with a 600cfm holley. have varried the timing from 4 degrees to 8 without any change.
other than the back firing it runs like a top. the engine was from my brother with 13k miles on it
Senior User
Joined: Sep 2000
Posts: 307
Likes: 0
where to start....
I have an 82 Bronco, which lost the 300 six to a 351 M. I had the same problem as you and I fought it for a long time before realizing I had a faulty weld in my new exhaust. Are your backfires all through the tailpipe, or do you get some through the carb? Check all you exhaust system for leaks, if you find any, no matter how small, get them fixed.
Murph
Murph
Thread Starter
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Elder User
Joined: Sep 2000
Posts: 936
Likes: 0
From: Bay area
where to start....
exhaust leaks?
where do I start.
cracked manafold on the passenger side just above the collector. and the place where the polution thingy went in is just a open hole.
guess I need a exhaust system eh?
where do I start.
cracked manafold on the passenger side just above the collector. and the place where the polution thingy went in is just a open hole.
guess I need a exhaust system eh?
Senior User
Joined: Aug 2000
Posts: 473
Likes: 1
From: Richmond, CA
where to start....
That hole sounds like where the oxygin sensor would be located. I recently replaced my rusted and cracked Peices of #@! stock manifolds with a set of hedman headers. The old manifolds came off in three pieces on the passenger side and two pieces on drivers side. The new headers came with an allen head set screw to plug the threaded hole on the passenger side header. My Y-pipe has a cross pipe where the oxygin sensor is currently located. I'm planning replacing the rest of my exhaust system from headers back.
