I have a 2000 alero 3.4 w/ 144000 miles and it was missing off of a
cold start for a while. And I had to add antifreeze once. I replaced
the surge tank cap and I didn't have to add anymore. But I still had
the missing. I bought a code scanner and it said it was missing on
the #1 cylinder. I checked the spark plug and found that inside the
ceramic it was rusty. ( I happened to have snapped it in half taking
it out. It seemed to have broken easily. Maybe it was cracked
already.) The end that sits in the head looked fine. No corrosion or
anything. Just normal wear. Since I replaced the plug it has not
recorded a missfire. But 2 days ago i drove it and it overheated. I
replaced the thermostat and it now runs fine. I have not seen any
white foamy oil or oil in my antifreeze. And it does not put out
strange smoke from the tailpipe. Early on in this ordeal you might
smell antifreeze when you were near my car but I never saw any
anywhere, and not more than once or twice. It didn't throw any other
codes. It has only overheated the one time. Should I buy a combustion
leak detector and see what it says? And if so will it tell me if the
manifold gasket is leaking or just the head?
Thanks in advance for your thoughts and suggestions.
You can try pressure checks of the cooling system. Some of those leaks
may show up externally, others may leak internally. Since you had to add
coolant, it makes it a bit suspicious.
People used to blame the DexCool, but I think it goes further than that. The
gaskets themselves were questionable, and installation methods have been
FelPro has a set of gaskets that I would use if I were going to do this job.
use DexCool, but it has nothing to do with the gasket issue.
You know, of course, that any time you remove a spark plug cable, as you had
to do when you replaced the plug, there is a definite risk that the cable
may fail due to its delicate internal structure.
Im not saying you DO have a leak, but dont dismiss the idea just because you
see coolant running down the heads or block.
Up down up down up down, like a toilet seat. That's what this thread is.
Who said what, and when? Who the f*** knows?
Ordinarily I snip and rewrap any post I reply to, but this one is so
marvelously confusing and wonderfully obfuscated by various clueless
pogo-posters as to be virtually impossible to follow. For this reason I
have left it as-is, as an example.
Add to that Outhouse's total failure to wrap quotes properly and you
have a complete mess. Disgusting.
Sorry for the OT rant. Rant mode is "off" now.
Hell - a good rant is a good rant. I use Outlook Express and I don't have
any problem posting consistently beneath the applicable text. No wrap
problems either. The pogo stick thing is purely a poster issue, not a
Are you still loosing water? Usually if you are leaking in to a
cylinder that plug will be very clean when u pull it as the water
steam cleans the cylinder.
At this point I wouldn't be assuming head gasket without more proof.
I am not losing any water now. I did take another look at the old
thermostat and it seemed to be physically stuck. And it had scrape
marks on it. I just cleaned the plug wire connection on the coil pack
a little bit ago. We'll see when I go home if it does the trick.
In my experience, you seldom can estimate the condition of a plug wire just
by looking at it (unless it is burned in two, of course.) Measure the
with a good VOM, or just replace them if you think they are bad.
the weakest point of the cooling system is the intake plenuim gasket in
the 3.4 and the 3.1 look real close below the thermastst housing on top
of trans belhousing for trails of coolant stains if the intake is leaking
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