Inconsistent MisFire

justasix04 · March 23rd, 2011, 10:32 AM

I have a 1999 v6 mustang with a vortech. And have a inconsistent miss on the passanger bank. Any ideas? it has new msd wires. newish plugs. replaced the coil a couple times but am ordering the new scream'n demon (or whatever its called) in a couple weeks. under load this miss is not existent.? tired of chasing ghosts!

Alexander III · March 23rd, 2011, 02:00 PM

Originally Posted by justasix04

I have a 1999 v6 mustang with a vortech. And have a inconsistent miss on the passanger bank. Any ideas? it has new msd wires. newish plugs. replaced the coil a couple times but am ordering the new scream'n demon (or whatever its called) in a couple weeks. under load this miss is not existent.? tired of chasing ghosts!

Injectors? Is it on the entire passenger bank?

mp4 player · March 23rd, 2011, 03:47 PM

I'd pull the plugs and see if there's obvious signs of one cylinder missing.

What plugs are they and what are they gapped at?

mustangmike! · March 23rd, 2011, 03:47 PM

last time i had missfires ... well lets just say that was a funny shaped push rod lol

Alexander III · March 23rd, 2011, 04:03 PM

Originally Posted by mp4 player

I'd pull the plugs and see if there's obvious signs of one cylinder missing.

What plugs are they and what are they gapped at?

x2 Pull plugs recheck gap with wire tool not disc gapper. Make sure the electrodes aren't damaged.

9986paulk · March 23rd, 2011, 04:37 PM

What all is done to the car other than the Vortech? I doubt the Vortech itself has much to do with it, other than putting a little extra stress on the engine. I had a miss on the drivers side I think but we never found the definite cause. when i took the cam out, it was fine. I don't think it was a tuning issue as neither Justin from VMPs tune had it idle even close to correctly or my tuner who's really good with Ford 3.8s. I've been hearing of a TON of miss and bank-to-bank issues lately, but maybe that's just cause my car made me so aware of it. Other than the basic stuff I have no other suggestions.

SSteady98 · March 23rd, 2011, 05:38 PM

Originally Posted by mustangmike!

last time i had missfires ... well lets just say that was a funny shaped push rod lol

Lol that 3 second in between and then a click really said something, huh. xD

khaos · March 23rd, 2011, 07:30 PM

Even if your wires are new, they might be worth looking at since you'll be in there. They could have gotten fried after you installed them. Mine was a combination of a definitely bad coil pack along side a bad CPS. It was one hell of a miss.

But you're saying your miss definitely goes away? Or that you only notice it while you're letting it idle?

9986paulk · March 23rd, 2011, 10:33 PM

THat's a big issue, it can be almost impossible to feel other than at idle if it's intermittent. If you have a tuner you can datalog and monitor misses.

March 23rd, 2011, 10:32 AM	#1
justasix04 Newbie Join Date: Jul 2010 Posts: 16 iTrader: 0 reviews	Inconsistent MisFire I have a 1999 v6 mustang with a vortech. And have a inconsistent miss on the passanger bank. Any ideas? it has new msd wires. newish plugs. replaced the coil a couple times but am ordering the new scream'n demon (or whatever its called) in a couple weeks. under load this miss is not existent.? tired of chasing ghosts!

March 23rd, 2011, 03:47 PM	#3
mp4 player Hardcore Enthusiast '00 V6 Procharged Mustang Join Date: Feb 2008 Location: WA Posts: 1,345 iTrader: 1 reviews	I'd pull the plugs and see if there's obvious signs of one cylinder missing. What plugs are they and what are they gapped at? __________________ 2000 Prochaged V6. T-lok, Mach 1 takeoff exhaust with H-pipe, 20% tint, OEM fogs and all HIDs. SAE Corrected: 289HP/298TQ at 5100RPM(Pegged MAF).

March 23rd, 2011, 03:47 PM	#4
mustangmike! I Post Entirely Way Too Much 2004,1994,1967 14.37 @ 96 Join Date: Aug 2008 Location: Texas Posts: 6,018 iTrader: 1 reviews	last time i had missfires ... well lets just say that was a funny shaped push rod lol __________________ 227whp N/A V6 Now w/ 8th Mile 8s ! How To Jmod Your Late Model 4R70W

March 23rd, 2011, 04:37 PM	#6
9986paulk Hardcore Enthusiast 1999 Mustang V6 Join Date: Dec 2008 Location: Youngstown Posts: 1,226 iTrader: 3 reviews	What all is done to the car other than the Vortech? I doubt the Vortech itself has much to do with it, other than putting a little extra stress on the engine. I had a miss on the drivers side I think but we never found the definite cause. when i took the cam out, it was fine. I don't think it was a tuning issue as neither Justin from VMPs tune had it idle even close to correctly or my tuner who's really good with Ford 3.8s. I've been hearing of a TON of miss and bank-to-bank issues lately, but maybe that's just cause my car made me so aware of it. Other than the basic stuff I have no other suggestions. __________________ Twin Turbo

March 23rd, 2011, 10:33 PM	#9
9986paulk Hardcore Enthusiast 1999 Mustang V6 Join Date: Dec 2008 Location: Youngstown Posts: 1,226 iTrader: 3 reviews	THat's a big issue, it can be almost impossible to feel other than at idle if it's intermittent. If you have a tuner you can datalog and monitor misses. __________________ Twin Turbo

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