If this started after the overheat a valve spring could have collapsed,
this
will not show on a compression test, or a bad hd gasket, there is no quick
anser here, all the bases must be checked, a leak down test will show a
bad
valve or hd gasket but not that weakened spring. This all assumes good
injector system and ign also.
"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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