PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

Missfire?

Old Dec 11, 2004 | 12:35 PM
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Default Missfire?

Why does my car missfire when i first start it?
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Old Dec 11, 2004 | 01:14 PM
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it is probably from the cam, you normally have to detune the misfire detection a little at idle for it. jes
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Old Dec 11, 2004 | 06:14 PM
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THe car is tuned. It just just did this today. Actually, 2 weeks ago i stalled when i started it and it would turn over. I fugured that i flooded it so i floored it when i cranked it and it started but it was missing. Again i figured i fowled a couple plug so i let it warm up and reved the hell out of it and it cleared up fine. Then today i go to start it and its missing. I has been raining for a week straight and i thought it may have to do with the fact that i havent started it in a week and some stuff may have become damp.
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Old Dec 11, 2004 | 06:19 PM
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maybe a plug wire or two are loose? or just bad/worn plugs, ive seen that before, or like you said maybe water is somewhere it shouldnt be... awsome hp numbers.. good luck
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Old Dec 12, 2004 | 01:09 PM
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Opps, i dont think i explained what happens correctly. Ok, when the car is dead cold (not run in 10+ hrs) it misses untill it warm up alittle, then it clears out and it is fine. I thought it was from the wet weather that we had and i figured that something may have gotten damp, but today it did the same thing and it is as dry as can be. I did stall out the car a couple weeks ago fowling out the plugs in the process. But i let it crank over and floored it to get it going and then it cleared up (like i said 2 posts up). I dont know if it is related. When its almost time for its winters nap anyway so once spring comes along new plugs, wires, and maybe some MSD coils (if people dont have any problems with them).

Paul
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Old Dec 12, 2004 | 04:02 PM
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possibly a maf problem? try disconnecting the maf and see if it goes away??
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Old Dec 13, 2004 | 08:13 AM
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Originally Posted by wait4me
possibly a maf problem? try disconnecting the maf and see if it goes away??
Lets say it is the maf, isnt every maf different and can possibly screw up the tune?
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Old Dec 13, 2004 | 08:29 AM
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Paul, pull a plug after its been sitting for a while and see if there is any oil on it. That may be causing you issue. If the plugs are oil coated, it takes a little to clear them at cold start. Any smoke at start up?
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Old Dec 13, 2004 | 10:12 AM
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I will look for some smoke as soon as i get home.

Paul
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