Misfire under boost.. - SRT Forums

OMGBOOST · 10-30-2009, 06:53 PM

Everything will be all good while driving normal, but as soon as i get on the gas and the boost starts to build at about 15psi misfires like crazy, and doesnt throw a code or anything. Any clue on whats happening and how i can fix it?

stickstickly36 · 10-30-2009, 07:01 PM

check the plugs and wires. mine was doing the same thing around 10psi. Granatelli wires and new NGK plugs gapped at .030 fixed my problem. .035-.038 should be good enough though. good luck

sponsorSRT03 · 10-30-2009, 08:24 PM

check spark plugs, wires, then coil pack. i just swapped my coil pack out today cuz i was having the same exact problems. spark plugs were good, wires were on good, so the coil pack was next. and it fixed it. i had an MSD coil for about 12K miles and worked like a champ but lately it started F*ing up at WOT and 15psi+ so i bought a granetelli or however u spell it from MPx and runs alot smoother. definitely get a granetelli coil if u need to replace ur old coil.

stickstickly36 · 10-30-2009, 09:57 PM

i heard the MSD coil sucks. still running the stock one. for about the same price i would try the plugs and wires first, if that doesn't work then try the coil.

rans04srt4 · 10-31-2009, 03:22 AM

I had the same problem, changed plugs....still...changed wires, problem went away.

OMGBOOST · 10-31-2009, 08:17 AM

thanks, i ordered grantelli wires and ngk iridium plugs last night. Gonna see how that goes. If that doesnt fix it next is my awesome MSD coil pack that was highly recommended

. So i should probably go grantelli coil pack?

GrenEggz · 10-31-2009, 05:10 PM

Quote: Originally Posted by OMGBOOST

thanks, i ordered grantelli wires and ngk iridium plugs last night. Gonna see how that goes. If that doesnt fix it next is my awesome MSD coil pack that was highly recommended

. So i should probably go grantelli coil pack?

mine was breaking up at about 5+ psi. Just installed the grantelli wires, grantelli coil, and ngk plugs gapped to .032-.038. and All I can say is OMFG. I thought my car was broke after I installed it. I thought I accidentally disconnected the wastgate vac line somehow, but nope. Car runs Amazing now. I also go the heat shield to protect the coil pack.

Agent_Smith81 · 11-02-2009, 12:51 PM

shit....mine doing the same thing, I know it has to be one of those....I had a pt turbo that once did the same thing, turned out to be a cracked spark plug.....but with the srt, I have a feeling its the msd coil pack....i'll try the spark plug first and I work at a honda dealer and hondas use ngks, so they'll hook me up.

Agent_Smith81 · 11-02-2009, 11:26 PM

fortunately for me, it turned out to be my spark plugs, bought some ngk plugs, gapped them at .034 each and that fixed it....I've only had my srt for 3 months now and was suprised to see autolite plugs....corroded and one was gapped over .040...but anyway, its fixed.

OMGBOOST · 11-06-2009, 09:03 PM

Grantelli wires and ngk plugs ended all my problems. Thanks for the help

Agent_Smith81 · 11-07-2009, 09:54 AM

nice....no prob bro.

turbojonsrt4 · 11-07-2009, 10:11 AM

Quote: Originally Posted by OMGBOOST

thanks, i ordered grantelli wires and ngk iridium plugs last night. Gonna see how that goes. If that doesnt fix it next is my awesome MSD coil pack that was highly recommended

. So i should probably go grantelli coil pack?

You should probably get rid of those iridiums for ngk 4306's.

Oh and I've been running on an msd coil for over 2 years with 400-500hp the whole time.

Agent_Smith81 · 11-07-2009, 10:14 AM

iridiums just fixed my misfire problem....what's the difference with the 4306's?

turbojonsrt4 · 11-07-2009, 10:26 AM

They work? You can get 4 for $8. It's what 95% of people on here use.

Agent_Smith81 · 11-08-2009, 09:28 PM

my iridiums were like $7.50 each..... not much but it was worth it.