Crusing in my '88 Chevy 2.8L V6 and all of a sudden car starts
bucking, huffing, slows to crawl... won't go over 10 mph.... feels like
starvation for gas.
Check Engine Light never comes on... (although it will
when I unplug the MAF).
Fuel pump powers up normally.
Car has 91,000, runs like a clock.
Never had any trouble for 15,000 mi.
Car starts up, will idle forever, will revv to redline in neutral,
but has absolutely NO power when in gear.
Suspect MAF. Car runs the same whether MAF is plugged in or unplugged.
Heavy Orange 12v MAF supply wire (fed through a relay) has no voltage on it,
and infinite resistance (pushed a needle through it to test it).
Nothing happens when I apply 12v to it either (naturally since it seems open
Two input pins to MAF from ECM have 4v and 6v dc on them. All the rest
seem uninterestingly dead. No variable signal on any MAF wire when revving
(of course I can't detect a 50 Hz square wave with an analog voltmeter).
This is one of those AC GM Thin Film type of MAF's.
1. Shouldn't there be 12v on the heavy orange supply wire
going into the MAF?
2. Where is the "MAF relay" located that energizes the
heavy orange supply wire?
3. Where is the 30 amp "inline" fuse that feeds the heavy
orange MAF supply wire located?
4. Is it possible the film burned out and blew the 30 amp
fuse at the same time? Why no check engine light if so?
3. Any suggestions:
a. Does this sound like a MAF problem?
b. Could this be a clogged fuel filter or some
other stupid problem... a vacuum failure?
I doubt it's ignition problems?
4. MAF's for this car are a dime a dozen in the junkyards,
and easy to replace, should I just get one and try it?
What about that blown 30amp fuse that's supposed to
be energizing the MAF?
not even funny, .... Benny