Engine Miss Fire. Distributor? - Team Camaro Tech
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post #1 of 17 (permalink) Old Apr 8th, 03, 07:34 AM Thread Starter
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Having just finished suspension upgrades I got ready to take her out on the road for some tests. When I started the engine I proceeded to check the timing after warm-up.
I set the inital and then had it rev'd to 2000 to check the mechanical adv. Every so often the #1 cylinder would miss (not fire a spark) and cause a corresponding engine hickup. I will check the other cylinders today.
I'm wondering what could cause this? I know I need new wires, but what would cause the miss? Is it the distributor, cap, coil? It is a stock points dist with accel coil and accel wires. Timing is 36 degress total at 2000rpm, 12 inital.

Jeff
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post #2 of 17 (permalink) Old Apr 8th, 03, 08:09 AM
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It could be a dirty contact in the cap, the wire could be cracked and shorting when that plug fires, the plug itself could be cracked and shorting too. Even a dirty or mis-gapped plug will cause a mis... Start with the simple things, unless you just replaced them a new cap, rotor, plugs and wires are good to have and I wouldn't call it throwing money at the problem...

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post #3 of 17 (permalink) Old Apr 9th, 03, 05:21 AM Thread Starter
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I tested the other cylinders last night and could not pinpoint anything. I could hear the problem (when my brother revs it up) but could not find it. Also, on #1 I realized that the problem is not that #1 DOESN'T fire, its that it sometimes fires WAY retarded. This happens maybe 1:20 plug fires. Does this change my situation? I know this is serious (more than not fireing) because this could cause detonation.
I am going to try the cap and wires as Dennis you suggested. My plugs are new also.
Jeff
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post #4 of 17 (permalink) Old Apr 9th, 03, 07:33 AM
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Leaning more toward bad wires from your last post but replace the cap and rotor too. Don't rule out a cracked plug just because they are new. As guys we often don't have that gentle touch and just banging a wrench against a plug could crack it. I'm speaking from experience on this one.

You might be able to lift your hood in a dark place and actually see sparks around the wires or plugs with the engine running. A dark place isn't in the garage with the doors closed and lights out but does need to be dark (no street lights)

...Dennis
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post #5 of 17 (permalink) Old Apr 9th, 03, 08:19 AM
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Do a compression test.

I had a periodic misfire in my Truck (SBC), turned out to be a bad head gasket.
Not trying to scare you or anything...

Matt Jones
Lead Mechanical Engineer
Art Morrison Ent. Inc.
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post #6 of 17 (permalink) Old Apr 12th, 03, 05:36 AM Thread Starter
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Hey all,
I changed the cap, rotor, and points and so far so good. I've got new heads to put on so I plan on pulling the engine sometime when I get some more money to buy rockers and redoing it anyway.
Silver69Camaro, lets say my head gasket is bad. What are the downs of not changing it right off the bat? I don't drive the car hard (yet anyway cause of my rockers).
Djd, I have seen the plugs fire at night (it's neat). Also, when I get the $$$ I'm going to new wires. Anyone like moroso, or Taylor?
jeff
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post #7 of 17 (permalink) Old Apr 12th, 03, 10:14 AM
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Just get a set of stock replacement wires to hold you over if the ones you have are shot. The light show looks cool but it's a problem and even if the engine doesn't seem to mis it won't be running at it's best.

...Dennis
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post #8 of 17 (permalink) Old Apr 15th, 03, 05:25 AM Thread Starter
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What is the problem with the light show? I haven't checked for it in a while so I don't know if it still does or not. The car still is jerky when it is crusing. Could this be that I'm too rich?
Jeff
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post #9 of 17 (permalink) Old Apr 15th, 03, 06:36 AM
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The light show means not all the spark is getting to the plug.. That would effect how the engine runs... Also it is a saftey issue. It could ignite gas fumes that build up under the hood (can you say explosion) or ignite a fire if gas or oil is leaked anywhere near it!!

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post #10 of 17 (permalink) Old Apr 15th, 03, 10:00 AM Thread Starter
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Ahhh, what is the cure?
Jeff
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post #11 of 17 (permalink) Old Apr 15th, 03, 12:13 PM
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does it seem really jerky under load? if so i bet its you wires. my car was missed once and a while, but under load it was like riding steem train. changed the wires and all is good now.

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post #12 of 17 (permalink) Old Apr 15th, 03, 12:25 PM
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Quote:
Originally posted by JefeOsterhead:
Ahhh, what is the cure?
Jeff
Proper fitting plug boots on good condition plug wires and occasionally a new spark plug when an insulator on a spark plug gets cracked as it will cause the light show as well...

...Dennis
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post #13 of 17 (permalink) Old Apr 23rd, 03, 06:14 AM Thread Starter
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Finally... I am expecting my plug wires today. I got Moroso blue max.
I'll let you all know how it goes.

Jeff
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post #14 of 17 (permalink) Old Apr 23rd, 03, 05:27 PM Thread Starter
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Well, got the wires and all... Didn't realize how much of a pain the right angle boots would be to cut and fit myself. I've only got 3 done. Am I doing something wrong? I'm lubing um and then trying to pull the end to be crimped through the right angle boot to be crimped, but it's rediculously hard.
More importantly, I've tested the 3 with a test light and they DON'T conduct. I tested my old wires as well and they didn't either. Is this normal? They are Moroso Blue max with 800ohms resistance/foot.

Anyway, I'll try again tomorrow.
(Who knew a muscle car could require so much muscle...)
Jeff
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post #15 of 17 (permalink) Old Apr 23rd, 03, 05:31 PM
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No conduction?

Strange. I don't want to point the finger, but I think you're doing something wrong, not sure what though...

Matt Jones
Lead Mechanical Engineer
Art Morrison Ent. Inc.
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