From: Mil-Veh Co. (milveh@sbcglobal.net)
Date: Mon Feb 07 2005 - 16:21:22 PST
RE: No fire on #2 cylinder. Stock M151.
Summary: Looking for a miss on #2 cyl., but despite
best efforts that miss continues.
Lastest effort: Made a new set of intake gaskets in
case it was a manifold air leak. (short version - it
didn't help!!!)
(long version) I applied a sensible amount of permatex
blue gasket maker to the gaskets and let them skin up
while I inspected the manifold and the intake ports on
the head.
They were all fine, #2 had black carbon on the top of
the intake valve built up, but seemed consistent with
an older engine.
No obstruction and no leaks. Least none that I could
determine by visual inspection or by applying ether to
number 2 intake area during a prior test run.
Checked all vacuum lines again (like 10-12 times now),
all intact and no visible signs of any leakage.
Removed the spark plugs again (at least 10 times now)
they all seemed to be burning fine, except for number
2..black sooty looking, but electrode clear of carbon
buildup.
Replaced intake manifold and tightened everything and
used gasket sealer on all brass fittings.
Re-inspected everything...looked darn good. A careful
r/r was done to everything.
Attempted to start engine, but engine bucked as if
timing too advanced. Got a little backfire through
the carburettor, this has been typical since problem
started. Hard starting since miss on #2. So I used
some ether and it started up, but ran rough. To me, it
starts like its out of time, I say this because it
resists or drags on the starter, which to me indicates
overly advanced timing...but it will run and seem to
have about 60% power on test drives, won't get any
better by moving dist. around, only gets worse.
Vacuum gauge said it was within time.
Removed plug wire from #2 engine continued to run as
before...rough. Visible spark to #2, but still not
igniting fuel in cyl. Note: I had swoped plugs again
with number 1 to see if the plug was somehow fouled.
Didn't matter, problem stayed on #2.
Swoped #3 lead with #2... no difference at all. #2
still not firing!
This is a NOS electronic dist. and its 3rd one I've
had in there since this problem arose. The miss
problem has stayed despite changing distributors,
changing to NOS set of HT wires, and all plugs checked
at least 10 times!
Re-re-re-checked clearance on distributor magnet to
cam lobe, right on. This all brand new stuff now,
everything looks right!
I swear the engine acts like it is out of time, will
barely start, but then #1 reaches TDC and the timing
mark lines up on crank pully???
What the *%#%$#@&* is going on here!
Next opportunity I'm going to replace the ground cable
on the battery just to be safe, but it looks ok.
Maybe somehow, someway there is corrosion somewhere on
the negative cable, but I sure didn't see it. Maybe
there is a short on the negative pole of the battery?
But, it looks good.
I'm basing my plug wiring order with number 1 HT lead
being the at top/front left if you were facing towards
the radiator from the rear of the Mutt.
I replaced HT wires based on TM firing order.
I tried to remember back to when it all started and it
seemed I was having a low battery problem due to a bad
alternator. Mutt was running great till then. When
batteries were charged back up it ran fine for a day
or so, but as batteries discharged it definately had
an effect on the running.
Since then I R/R'd the alternator, running the 8 ga.
pos. lead direct to the pos. on the battery, charged
both batteries back to full and it continued to run
rough.
Just FYI as a reminder: Compression test was done
earlier after pulling all the plugs, each cyl. was
about 101-105 lbs dry.
Thanks for indulging me on this, despite not having
found the cause, your suggestions have helped keep up
my moral. I know I will find the miss eventually, but
I have to admit this is an odd one and its been real
frustrating. This should be an easy, no brainer,
right? Uh-un, no way... stay tuned for more.
This archive was generated by hypermail 2.1.4 : Sat May 07 2005 - 20:39:50 PDT