Had a intermittent miss in my '99 Yukon.
The distributor was the culprit after changing out the everything else in
the ignition system.
The plastic base POS one that didn't even make it 100k miles.
"JR" <racmsc@[EMAIL PROTECTED]
> wrote in message
news:qT0Pj.446$555.9956@[EMAIL PROTECTED]
>I have a 1997 GMC Yukon w/5.7l engine, SLE package w/160,000 trouble free
>miles.
> During a trip to meet friends in Canada, my wife was driving and noticed
> the temp
> guage was pegged (260 degrees). She woke me up and we limped the truck a
> half mile
> off the QEW to a Tim Hortons where I opened the hood and saw steam, not
> water,
> blowing out of a crack in the plastic radiator tank next to the upper
oil
> cooler fitting.
> The engine was HOT. It was pinging and rattling when we shut it down.
> We went inside the coffee shop to eat lunch and let the truck cool down.
> When the truck was cool we filled it back up with plain water and
started
> the engine
> and noticed a limp as if it was missing on one cylinder. We drove the
20
> clicks
> to our destination carefully watching the temp guage.When it came time
to
> drive home,
> about 250 miles, I added a bottle of barr's leak and made it home
stopping
> to add water as needed.
> A new dual core radiator solved the overheating problem, but I have been
> pulling my hair out trying to get the
> truck to idle like it used to b4 the overheating.
> The scanner says intermittent miss cyl 4., and I dropped fron 18-19 mpg
to
> 16-17mpg.
> New plugs, cap, rotor, & wires didn't help.
> Compression ck shows good and even across all cylinders.
> At hi idle the engine smooths out and runs better.
> At cold start it seems to idle better than when it'swarmed up.
> It doesn't seem to be an ignition problem, could the heat have damaged
the
> fuel spider some how? I read in this group that when the spider leaks it
> dumps raw
> fuel into the intake above #4 cylinder.
> I have always used Mobil 1 in this engine and the oil looked good after
> the overheating episode.
> Comments? Ideas?
> thanks
> JR
>
>
>
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