I have an 88, S15, 4.3, Auto, 4x4, with 197,000 miles that's driving me
crazy (crazier??)......It runs fine when cold. When it reaches operating
temp and it's driven at around 40 to 50 mph, it feels like it's cutting out
electrically. It happens for a second and then will be ok for another
minute or so, then it does it again.
It's not setting any codes. I've used WinALDL and see all the sensors
responding as they should. Timing has been checked and it's fine. ESC is
working because when I disconnect it I see the timing change........It has
new injectors (Standard), plugs, wires, rotor, cap. My mechanic also
changed the pickup in the distributor - since that was original. Also
changed some vac lines that were dry-rotted.....All this, yet I'm still
experiencing the problem. I'm stumped - and so is my mechanic.
I'd appreciate any help you can provide.
My '89 Blazer drove me crazy with a intermittent miss/power drop out. Mine
would run fine unless climbing a hill or stomping on it. Will not set a code
One night I got lucky and heard it arcing and then I saw the coil arcing.
Remember it's intermittent and I just happened to be in the right spot with
the hood up.
If you look close at it you'll see the grey arc mark where it shorts from
the coil to the laminated frame.
Get a quality repl. coil , I cheaped out an put a AZ one it, lasted 2 weeks
and same problem again until I put the NAPA coil then problem free after
I have a 88, K1500 with a 5.7L and it just started doing the something like
It only cuts out after its warmed up, mostly after a short blast on the
It will miss and/or has no pwr at idle and at lower speeds. I can hear it
ping badly and a few times it backfired into exhaust manifolds. It will do
that for a minute and then run fine. It will not do it all the time, I can
it 20 minutes, it will miss for a bit then run fine. Like you, no error
I don't think its a fuel pump problem, in that if the pump is actting up it
it would miss longer and at all speeds, hot or cold, ( IMHO ). I am betting
something with the ignition. I 'm just starting to look into it, and will
let you know what (if) I find.
It turned out to be a bad set of wires. Sprayed the wires with a misting
bottle and it almost stalled. Replaced the wires and she's running like her
Thanks to everyone who offered assistance.
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