Backfire Problem :( - SRT Forums

DutchSRT4 · 05-06-2008, 12:34 PM

Hey guys, all of a sudden my car is starting to misfire only when at full boost, almost sounds like its backfiring through the intake. When idling or just putsing/cruising on the highway it runs 100%. I think that it may be a WGA problem. All vacuum lines are good, plugs are good and so are the wires. I have the AGP w/g (about 90000kms on it). The car has always had really bad Part throttle boost, and the misfire is the worst when in PTB, but still does it under full boost. Any help would be great, thanks guys.

HCCAFan · 05-06-2008, 12:42 PM

Spark plugs or fuel cut.

missionsk8r21 · 05-06-2008, 12:45 PM

try running the stock coil and wires with sum ngk's/champion plugs gapped @ .35. I had the same problem and that fixed it.

DutchSRT4 · 05-06-2008, 12:53 PM

Already tried changing the plugs and the wires, even switched out the coil to check that. All checked out good. Gap is at .045, so I will try .035, and they are Champion Iridiums.

DutchSRT4 · 05-06-2008, 03:08 PM

Re-gapped them and the problem is gone, thanks for the help guys!!!

orangesrt-4 · 05-06-2008, 06:17 PM

Quote: Originally Posted by DutchSRT4

Re-gapped them and the problem is gone, thanks for the help guys!!!

just curious what were they gapped at before you changed it?

teufelhounden91 · 05-09-2008, 06:21 PM

wait you gapped irridiums? I just had a huge convo w/ the guy at pepboys on how important it is to NOT gap irridium plugs...ever. He said "you're never supposed to touch the gap of an irridium plug, or they wont work." Factory comes at around .042 and needs to stay there. Is this true? I want to bring mine down to .035 but now Im afraid to.

orangesrt-4 · 05-09-2008, 09:27 PM

Quote: Originally Posted by teufelhounden91

wait you gapped irridiums? I just had a huge convo w/ the guy at pepboys on how important it is to NOT gap irridium plugs...ever. He said "you're never supposed to touch the gap of an irridium plug, or they wont work." Factory comes at around .042 and needs to stay there. Is this true? I want to bring mine down to .035 but now Im afraid to.

first mistake: Auto parts suppliers usually don't know crap! That guy is an idiot. if you up the boost you should gap them smaller, but i stay with in the specs of stage 2 requirements. I think its .032-.036 if you gap them smaller you will burn them out faster but if you are not stock boost levels then you will have to play around till you get them dialed in.

teufelhounden91 · 05-09-2008, 09:38 PM

lol, thanks for the smack in the head! I just gapped mine from .046 to .035 and im actually HOLDING BOOST!!!!! Crazy! Stock, I peak 16, and hold 14-15 to Fuel Cut-off.

Im gonna go to Pepboys and slap that mo-fo!

shadowsz · 05-09-2008, 11:56 PM

..the guy at pepboys tried to tell me that a 3 ton engine hoist wouldnt hold an engine...

teufelhounden91 · 05-10-2008, 09:41 AM

hahaha! was he trying to sell you a 10-ton hoist instead? theyre really good about listening to your needs, and trying to upsell the sh*t out of you. I bought a tube of gasket silicone for the block plate I put on the turbo. He said a small 0.5 oz tube wasnt enough, and that i needed a 1.5 oz for 3x the price. I laughed at him, and bought the small one and after generous use there is still 90% of the tube left. Jerk-off!

orangesrt-4 · 05-10-2008, 01:15 PM

Quote: Originally Posted by teufelhounden91

hahaha! was he trying to sell you a 10-ton hoist instead? theyre really good about listening to your needs, and trying to upsell the sh*t out of you. I bought a tube of gasket silicone for the block plate I put on the turbo. He said a small 0.5 oz tube wasnt enough, and that i needed a 1.5 oz for 3x the price. I laughed at him, and bought the small one and after generous use there is still 90% of the tube left. Jerk-off!

What! there should be atleast 98% left in that tube