I've got a 90 S10 Blazer that will start run for 5 to 10 seconds and
die. It will finally start and stay running as long as I don't shut it
off, if I do everything starts all over and it can take 5 to 10 tries to
get it going. So far I've changed , cap, rotor, plugs, fuel pump,
ignition modular, fuel reg, and the map sensor, anyone else have this
problem and what was the cure? TIA
EGR valve or clogged cat converter ..EGR clogged w/ carbon will cause loss
of idle; will die at stop lights etc unless you keep high idle with
accelerator. Clogged cat causes severe loss of power /dying.
It can be one of several things:\
But, here are the things I would first look for: An exhaust leak before the
O2 Sensor, as in the donut gaskets and the manifolds to the block!
Check for donut gaskets, and even at the Cat to cross pipe connection. This
causes a vortec and actually vacums in excess atmospheric air.
Secondly, get an exhaust back pressure checking fixture, check the back
pressure at the O2 bung. I have an old Thexton that pierces a hole, the
nipple is a 1/4'x20 thread tap and nipple, I use stainless bolts to block
off the holes. If there is 2 pounds before the converter, it is suspect, 3
pounds and it is a piece for the core collectors.
Also, have you checked spark intensity with a cheap adjustable spark tester?
It should jump 3/4's of an inch without a problem, any less is a problem.
maybe a weak coil?
These are seat of the pants guesses, and I can't help unless you do these
basics and post back. Please feel free to ping me for any assistance and no
wise ass attitude!
Doc, Charles Bendig and my self are always nice guys, trans Surgeon was a
nice guy, but unfortunately he got sick of the internet anal fistulas!
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