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Old 07-10-2005, 11:45 AM
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383 Sparking problem @ 2500-3000 rpm

Hello!

My new engine when fully warm ( when I start in the morning or after it becomes fully cooled this does not happen), starts to work bad under pressure and in 2500-3000 rpm. One or two cylinders don't work or the spark jumps. Something like a Back Fire through the exhaust.

I tried to locate jumping spark, but it seems that there's non.
I changed distributor cap & Coil and again it has the same problem.

What should I do?
Could it be the Spark Plugs? My spark plugs are TP 392 C Split Fire Triple Platinum.

Could this be plug Heat Range problem?

Any comments?
I really don't know where to look for the problem!

Thanks,
Houman

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Old 07-10-2005, 05:18 PM
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spark?

If is getting fire it could be a valve train problem. Is it a definite cylinder that has a problem or is it random?
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Old 07-10-2005, 06:50 PM
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It is not a heat range problem. I'd not run a silly plug like a splitfire though, I'd run either an A/C, Autolite or NGK. I prefer NGK's. Cross the splitfire with one of those as a first attempt to cure the misfire. When doing this inspect all the plug wires, especially the boot area that plugs into the plugs, for burning or black arcing. If you have a good digital OHM meter check the wires for spec. They should all ohm about the same if you don't know the spec pre foot for the wires. I suspect either the plugs and/or the wires in a heat soak misfire condition.
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Old 07-10-2005, 09:44 PM
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I'm with Rick. Splitfire, bosch platinum +4 and all those other "specialty" plugs are just a big hype. they dont really do anything. although, i did have splitfires in an angine once and it ran like crap, shaking, missing... tracked it to the plug, put A/Cs back in it and it ran fine. Been using A/Cs and NGKs ever since.
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Old 07-11-2005, 12:16 AM
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O.k.

So everyone thinks that this is Spark Plug Problem?
I have used these plugs with my AMC 304 and a chevy 350 engine earlier along with MSD, and never had problems.
Now I really don't know. O.K. I'll change the plugs and see what happens.

Could it be the wires? They are Accel 8.8.

Tks,
Houman SS '70
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Old 07-11-2005, 07:33 AM
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Weak spark, try closing up the plug gap.
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Old 07-11-2005, 09:08 AM
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if you have Accel wires... i'd check those before i messed with the plugs. i wasnt tellin ya to change the plugs, but i've never had any luck with them. whats the gap on your plugs now? do you have any other Accel products on the car?
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Old 07-11-2005, 11:05 PM
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Well, I only have Accel Wires.
The yellow ones.

The plugs I have not checked the gap? Can anyone tell me what it should be?

But why does this happen when the engine becomes warm? It's very strange.
So, do you think that plug gap has to do with engine temperature?

My compression ratio is 9.8 -10:1 and heads are Edelbrock Performers.
Last night I tried to test Spark Jump but didn't find any. I tried to get a screw driver close to the plugs ( some one told me if the spark is jumping, getting some screw driver close to the plugs will show the spark, I mean the spark will jump to the screw driver's head) but there was no jump???

Really dissapointed, I want to break in the engine for some 500 miles, but can't do it like this.

Thanks,
Houman SS '70
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Old 07-12-2005, 09:50 AM
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NOOOO!!!!!!!!!! NEVER NEVER NEVER stick a screwdriver anywhere NEAR the ignition system while its running. not unless you want 30,000 volts runnin up your arm. trust me on this one, lol... it HURTS.

anyway... yeah, if the gap on the plugs is too wide then it will affect your temp. what kind of engine are we talkin about here? does it have an HEI ignition? a standard chevy 350 will run about.035" w/o HEI, with HEI it'll run about .045". but it depends on what engine your talkin about.
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Old 07-12-2005, 01:08 PM
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The fuel mix is easier to fire when the engine is cold.
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Old 07-13-2005, 03:31 AM
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Quote:
Originally Posted by 97Z28
NOOOO!!!!!!!!!! NEVER NEVER NEVER stick a screwdriver anywhere NEAR the ignition system while its running. not unless you want 30,000 volts runnin up your arm. trust me on this one, lol... it HURTS.

anyway... yeah, if the gap on the plugs is too wide then it will affect your temp. what kind of engine are we talkin about here? does it have an HEI ignition? a standard chevy 350 will run about.035" w/o HEI, with HEI it'll run about .045". but it depends on what engine your talkin about.

Yea, my engine is:

383 with Edelbrock Al. Heads
Mallory HEI Dist.
Accel 8.8 wires
Splitfire Triple platinum TP 392 c Spark Plugs



Do you guys think that this is Spark Plug Gap problem? What should the gap be? How much?

Thanks,
Houman
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