Hot Rod Forum banner
1 - 3 of 3 Posts

·
Registered
Joined
·
230 Posts
Discussion Starter · #1 ·
It is probably been asked before but what would cause a cold engine misfire that mostly goes away as temp rises on t.b.i 4.3 in an 89 Chev pickup? I replaced cap and rotor and no improvement. Exhaust looks real clean so maybe it's a lean out issue? Gas milege is not getting worse also. Thanx ,Clint
 

·
Registered
Joined
·
59 Posts
Also, make sure the egr valve is closed at idle. I have had a problem similiar on my '88 blazer with the 4.3... sometimes it does it and sometimes it doesn't. The little vacum motor is getting weak on mine so it lets the egr re-circulate when it shouldn't at an idle and especially on start up. Good luck.
 
1 - 3 of 3 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top