Misfire - TriStateTuners.com :: Home of Tristate Auto Enthusiast

DaveTheWhiteAsian · 03-15-2006, 02:35 PM

So my car is misfiring when i get to 4500 rpms, every gear, happens everytime. The shop has so far replaced my plugs and coil packs and its still doing it. Any ideas?

05CGMSTi · 03-15-2006, 03:14 PM

Quote:

Originally Posted by DaveTheWhiteAsian

So my car is misfiring when i get to 4500 rpms, every gear, happens everytime. The shop has so far replaced my plugs and coil packs and its still doing it. Any ideas?

What mods, and CEL codes are you getting?

DaveTheWhiteAsian · 03-16-2006, 01:06 AM

just an up pipe, nothing at all and 301 and 302, they did an engine compression test too and 145 psi in cylinder 1 and then like 150 in the rest something around those lines

DaveTheWhiteAsian · 03-16-2006, 09:08 AM

bump

MuddyREX · 03-16-2006, 09:16 AM

Hmmmmmm. My car has been misfiring lately around the same RPMs. Only happens when it is very wet/humid out and the car is still a little cold. My car has around 100k miles of abuse on it, so I am not surprised.

DaveTheWhiteAsian · 03-16-2006, 09:51 AM

i have 90k of pure abuse

DaveTheWhiteAsian · 03-16-2006, 07:16 PM

any other ideas anyone?

TehWagon · 03-16-2006, 08:25 PM

that's wierd. i've been dealing with misfires for a long time and have researched the crap out of it, but you've covered all the bases so far. and since you listed an uppipe as your only mod, i'm assuming you don't have lightweight flywheel? you bought the car new?

coilpacks, plugs... hmph. when did it start happening? any changes to the intake? maybe a dirty filter?

DaveTheWhiteAsian · 03-16-2006, 10:48 PM

I didnt buy the car new i just got it a little while ago

i should have waited longer and found a different one. I dont think i have the lightweight flywheel im not sure. to my knowledge the cars all stock except for that. im completely puzzled

TehWagon · 03-16-2006, 11:10 PM

hm. be interesting to take a look at it at the next meet, does it still have all the heat shields/green brackets etc?

it'd be interesting to take a look and see if there's signs of it having been modded before... that could be your problem...

EjTwentyFiveSTi · 03-16-2006, 11:16 PM

A misfire can be caused a multitude of items such as tuning (timing, fuel, etc), plugs (fouled) ignition (weak spark), air intake (clogged filter), fuel (clogged filter or poor gas)...etc. The list could go on and on.

Does the misfire feel harsh, light? Are the plugs gapped correctly? Have you tried the copper plugs? Do you have any sort of monitoring equipment, boost, egt, etc? Have you checked all hoses, lines, gaskets?

With just an upipe, the car should be fine, but if you bought it used, im going to guarantee it had other mods.

DaveTheWhiteAsian · 03-17-2006, 12:50 AM

it definitely had other mods..it had a utec in it too, they just put the stock spark plugs back in and im assuming that theyve checked my hoses and what not theyve done it before. suposedely the guy thats working on it isnt one of those just out of school ASE techs. idk i just want my car back

DaveTheWhiteAsian · 03-17-2006, 12:56 AM

and the misfire is very light, i didnt even know it was a misfire until i took it into the shop i thought my turbo was ****ed because it was making crazy winding noises, but those stopped and its actually throwing misfire codes

teh DIRT · 03-17-2006, 01:14 AM

in muddys case.

id look at your MAF sensor. my car was doing this same thing when it would get moist out/ rain. Id be driving along, it would start raining, BAM the car would fall on its face. Bad maf sensor, replaced it and bingo

Orbit · 03-17-2006, 02:14 AM

check your spark plug gap. it should be between 0.028 and 0.031 .

D Money · 03-17-2006, 02:28 AM

I dunno what it could be, but I know when I heard you leave from the meet last week it didn't sound good. You car makes a wierd winding noise as it drives, I would check that out too.

DaveTheWhiteAsian · 03-17-2006, 01:22 PM

that was my turbo gasket leaking+a seized idle pulley, all fixed and there using the stock NGK plugs so i dont see a problem with that

MuddyREX · 03-17-2006, 02:35 PM

Quote:

Originally Posted by teh DIRT

in muddys case.

id look at your MAF sensor. my car was doing this same thing when it would get moist out/ rain. Id be driving along, it would start raining, BAM the car would fall on its face. Bad maf sensor, replaced it and bingo

That'd be two bad MAFs in two years.

DaveTheWhiteAsian · 03-18-2006, 01:04 PM

anyone have any other ideas?

DaveTheWhiteAsian · 03-20-2006, 04:00 AM

I don't know if this is gonna help or not, but i got my car back from the garage temporarily until another mechanic comes back from vacation to look at it. Anyways, they swapped new plugs and a new o2 sensor in the car and they were saying it was still misfiring but it seems to be more random now. I dont know if that helps at all

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03-16-2006, 09:16 AM	#5
MuddyREX Tri-State Post Whore Join Date: Jan 2005 Location: Perkasie, PA Member #82 My Ride: 02 Subaru WRX iTrader: (4)	Hmmmmmm. My car has been misfiring lately around the same RPMs. Only happens when it is very wet/humid out and the car is still a little cold. My car has around 100k miles of abuse on it, so I am not surprised.

03-16-2006, 11:16 PM	#11
EjTwentyFiveSTi Tri-State Training Wheels Join Date: Feb 2006 Location: River City, NJ Member #1422 My Ride: 05 STi iTrader: (0)	A misfire can be caused a multitude of items such as tuning (timing, fuel, etc), plugs (fouled) ignition (weak spark), air intake (clogged filter), fuel (clogged filter or poor gas)...etc. The list could go on and on. Does the misfire feel harsh, light? Are the plugs gapped correctly? Have you tried the copper plugs? Do you have any sort of monitoring equipment, boost, egt, etc? Have you checked all hoses, lines, gaskets? With just an upipe, the car should be fine, but if you bought it used, im going to guarantee it had other mods.

03-17-2006, 02:14 AM	#15
Orbit Tri-State Addict Join Date: Dec 2004 Location: Hainesport,nj Member #32 My Ride: 2002 WRX iTrader: (0)	check your spark plug gap. it should be between 0.028 and 0.031 .