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Author
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Topic: Ignition Missfire
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Jake11
Gearhead Posts: 207
From: Banning,Ca,USA
Registered: Oct 2005
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posted 12-04-2005 04:34 PM
   
Here's the quick and easy way to diagnose those pesky ignition problems.
You need screwdriver, a jumper wire with good alligator clips on the ends,
and a dental pick. Make sure the dental pick has a good sharp end on it. First
thing to do, if your sure you have even compression, is set the E-brake, make sure
it's in neutral or park. Open the hood. If it's gonna be in the way, take the air
cleaner off and set it out of the way. Now turn the ignition key to run. Go to the
engine and pull the coil wire out of the distributor. Locate the starter solenoid
on the fenderwell and while holding the end of the coil wire a 1/4�� from the block,
crank it over. The spark should look big and nasty! Be carefull, you might get to
experience it . If it passes this test, plug it back in to the cap. Start it up and let
the engine warm up. Have a cup of coffee, or other. After it's warmed up, get your
jumper wire. Hook one end to the battery ground and the other end to the dental
pick. Now take your dental pick and use the sharp pointy end, and one at a time use
it to pierce and short each plug wire boot/connection on the dist.cap. The engine
should miss and have the same rpm drop for each one. If not you just found your
problem. Now you have to find out what is causing the ��missfire��. Ck. The cap
for carbon tracks or cracking at the terminals. Ck the plugwire, ck the plug for a
cracked insulator! Above all, be carefull! Keep everything you plan on using
again out of that fan and belts. DO NOT use the carbuerator for a ground. Hope this helps someone.
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DidgeyTrucker
Gearhead Posts: 1681
From: Greenbrier, TN USA
Registered: Oct 99
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posted 12-04-2005 07:04 PM
This is a GREAT trick - tip. I've seen fancy diagnostic machines that electronically "kill" a cylinder. I used to actually pull the wire from the cap!This will help find a dead cylinder - no matter what has killed it. If the RPM doesn't drop, that cylinder was not contributing. Now comes the big job of finding out why. Tracy ------------------
Tracy M&M #245
MAC OS9.1 & 10.3.9/ Earthlink DSL
1956 F-100 Panel w/429 (3.50 9")
1966 F-100 SWB w/351C (3.25 9" - 3.70 posi for Saturday nights)
Music City F-100's,
1965 GT-350 S/C (2.78 1st & 3.70 TracLok 9")
Music City Mustang Club
1969 Schwinn StingRay
Don't focus on the destination....make the JOURNEY the adventure
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Jake11
Gearhead Posts: 207
From: Banning,Ca,USA
Registered: Oct 2005
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posted 12-05-2005 01:00 AM
I call it the Polish scope. I can say that
cause I'm part Pollock. I'll post more tips
as their needed. I thought this one was.
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