Misfire - 2003-04 Mach 1 Registry Owners Club

hecdel40 · 03-15-2014, 12:10 PM

I’m having a misfire around 5000 rpm at WOT and for like a fraction of a second and after the misfire the car goes up to 7 grand with no problem, and when I turn on the meth you can feel it harder at the same rpm. The car made 662 rwhp and 550 rwtq on 93 octane with the misfire so is pulling very strong.
What I done so far change spark plugs and coils put the car on the dyno check tune and wires from the MAF oh and no codes.
The car has, sct 3000 maf, vortech TI-trim, granatelli connectors, and stock COP.
Can someone help thank you.
Hector

Mach828 · 03-15-2014, 12:32 PM

What did your tuner say about it?

Sent with a shot of DROID go fast

machdude · 03-15-2014, 01:01 PM

I second that question.
It's possible it's pulling timing at that rpm and that's what you're feeling.

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hecdel40 · 03-15-2014, 03:04 PM

The tuner still working on a fix, and the car is not pulling timing

machdude · 03-15-2014, 09:48 PM

What plugs do you have? And what's the gap set at? Possible the spark may be blowing out

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hecdel40 · 03-15-2014, 10:42 PM

Quote:

Originally Posted by machdude

What plugs do you have? And what's the gap set at? Possible the spark may be blowing out

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NGK TR6 at .25

machdude · 03-15-2014, 11:17 PM

Fuel? E85?

Edit: nvm I see you're on 93 oct. I would talk to the tuner and see what he recommends. I know someone running some tr7's at an 18 gap but he's on e85 and making more power than you. I would talk to the tuner. Maybe a different plug will resolve your issue

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hecdel40 · 03-17-2014, 08:33 PM

Quote:

Originally Posted by machdude

Fuel? E85?

Edit: nvm I see you're on 93 oct. I would talk to the tuner and see what he recommends. I know someone running some tr7's at an 18 gap but he's on e85 and making more power than you. I would talk to the tuner. Maybe a different plug will resolve your issue

Sent from my iPhone using Tapatalk

The tuner talk about going with a TR7 will see if this work.

SHAKN' 04 · 03-17-2014, 08:47 PM

You sure the gap on it isn't too small? I accidently gapped my plugs on the eatonswap @ .022 one day and it misfired like crazy. That's with the TR6's

hecdel40 · 04-13-2014, 12:34 PM

Find out what the problem was the alternator is only putting out 80 amps

Vndcatr · 04-13-2014, 01:00 PM

Quote:

Originally Posted by SHAKN' 04

You sure the gap on it isn't too small? I accidently gapped my plugs on the eatonswap @ .022 one day and it misfired like crazy. That's with the TR6's

every car is different. Had one cobra that demanded .25 gap and another that wanted .28 Gap

If it is spark blowout. Go BRISK plugs,

Vndcatr · 04-13-2014, 01:01 PM

Quote:

Originally Posted by hecdel40

Find out what the problem was the alternator is only putting out 80 amps

glad to hear.. btw, thats a healthy #.. whats ur full mod list

03-15-2014, 12:10 PM	#1
hecdel40 Registered User Join Date: May 2008 Location: Waveland MS Posts: 326	Misfire I’m having a misfire around 5000 rpm at WOT and for like a fraction of a second and after the misfire the car goes up to 7 grand with no problem, and when I turn on the meth you can feel it harder at the same rpm. The car made 662 rwhp and 550 rwtq on 93 octane with the misfire so is pulling very strong. What I done so far change spark plugs and coils put the car on the dyno check tune and wires from the MAF oh and no codes. The car has, sct 3000 maf, vortech TI-trim, granatelli connectors, and stock COP. Can someone help thank you. Hector

03-15-2014, 12:32 PM	#2
Mach828 Dark Knight Join Date: Nov 2009 Location: Albuquerque, NM Posts: 5,759	What did your tuner say about it? Sent with a shot of DROID go fast __________________ Vortech V2 S-trim, E85, A2A Treadstone, Comp cams, built engine, full exhaust, built rear, built 4r70, more mods. Tuned by me with SCT Advantage

03-15-2014, 01:01 PM	#3
machdude Registered User Join Date: Dec 2012 Location: so cal Posts: 389	I second that question. It's possible it's pulling timing at that rpm and that's what you're feeling. Sent from my iPhone using Tapatalk __________________ 1st Mach 2nd mustang Mods: K&N drop filter, Full Mac exhaust with Lt headers, 4:10 gears, eibach sport line springs, tubular cross member, steeda short throw

03-15-2014, 03:04 PM	#4
hecdel40 Registered User Join Date: May 2008 Location: Waveland MS Posts: 326	Re: Misfire The tuner still working on a fix, and the car is not pulling timing

03-15-2014, 09:48 PM	#5
machdude Registered User Join Date: Dec 2012 Location: so cal Posts: 389	What plugs do you have? And what's the gap set at? Possible the spark may be blowing out Sent from my iPhone using Tapatalk __________________ 1st Mach 2nd mustang Mods: K&N drop filter, Full Mac exhaust with Lt headers, 4:10 gears, eibach sport line springs, tubular cross member, steeda short throw

03-15-2014, 11:17 PM	#7
machdude Registered User Join Date: Dec 2012 Location: so cal Posts: 389	Misfire Fuel? E85? Edit: nvm I see you're on 93 oct. I would talk to the tuner and see what he recommends. I know someone running some tr7's at an 18 gap but he's on e85 and making more power than you. I would talk to the tuner. Maybe a different plug will resolve your issue Sent from my iPhone using Tapatalk __________________ 1st Mach 2nd mustang Mods: K&N drop filter, Full Mac exhaust with Lt headers, 4:10 gears, eibach sport line springs, tubular cross member, steeda short throw

03-17-2014, 08:47 PM	#9
SHAKN' 04 Registered User Join Date: Jan 2008 Location: Kyle, Texas Posts: 2,285	Re: Misfire You sure the gap on it isn't too small? I accidently gapped my plugs on the eatonswap @ .022 one day and it misfired like crazy. That's with the TR6's __________________ SOLD04' Mach 1 -Comp Cams 106100's (deg 106/110) -Eatonswap with 3.4 Pulley -Full Exhaust (mac lts & xpipe, sss terminator c/b) -Built Rear w/ 3.55 gears [B]-Tuned by Lethal Performance of San Antonio -510hp/478tq

04-13-2014, 12:34 PM	#10
hecdel40 Registered User Join Date: May 2008 Location: Waveland MS Posts: 326	Re: Misfire Find out what the problem was the alternator is only putting out 80 amps

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