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Old 11-03-2006, 11:03 PM   #1
subenerd
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Default Cold start misfire -- What could be the cause??

My friend has a new 2006 wrx tr, all stock. ~ 5000 miles in about 2-3 months.

He has had 2 cels. The first time he reset the ecu by disconnecting the neg. battery terminal. It happened again about a month later so he took it to the dealership. They said it was for a cold start misfire, he didnt get the code.

Now this dealership (MT Diablo in Walnut Creek, CA) is well know to be retarded. They told him it was from 'bad gas'. He only uses 91 and iirc the last tank was from Shell.



Any ideas? Thanks!
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Old 11-07-2006, 07:23 PM   #2
dying2live
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The same thing happend to me. I was just sitting there waiting for the engine to warm up and i felt it miss fire then the cel came on. Dont know why . Then it went away after like 2 or 3 days. OH and the codes on mine where something like p0301, p0303, and p0304. Meaning: misfire in cylinder 1,3 and 4. I got it off my accessport.

Last edited by dying2live; 11-07-2006 at 07:33 PM.
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Old 11-09-2006, 12:49 AM   #3
subenerd
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Bump, thanks for the info. Anyone else?
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Old 01-18-2007, 12:29 PM   #4
wrxsoon
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Same thing happened to me, waiting for it to warm up and then boom check engine light, misfires in 1,2,3,4. Went to the dealer they charged me 100 buxs and told me it was my compustar alarm installation. The alarm is installed perfectly, so now Im just waiting to see if it happens again....
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Old 01-18-2007, 04:06 PM   #5
spoonracing13
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Seems to be pretty common. I got 15k+ on my car, got P0301, P0303, and ???? at 14.6k and at 15.2k. Both times within a few seconds of startup. Actually both times suprised me, as I started the car, then changed the radio station and put my phone in my bag, looked up, there's the CELs.

Advice I've received is to turn the key to the "on" position for a few seconds to get the fuel pump ready to go, then turn the key the last bit to actually start the thing. Since I've done that, no misfires, but it may just be a matter of time, quality of gas, etc....
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Old 01-18-2007, 08:35 PM   #6
Team optimum#5
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Today I filled up with a full tank of 93 gas. Start the car and I got a missfire on 1, 2 and 3.
Its cold around here but my car was already warmed up...

Makes me frusturated, what can cause this?
mods: hks cat back, hks dp, gfb recirc/atmostphere bov, k&n intake stage 2 ap.
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Old 01-18-2007, 10:18 PM   #7
Turbozn2006
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I've had the same problem (stock). I started my car in the drive-way to warm up. Got a little burp from the engine, and the check engine light came on with the cruise light flashing. So I took it to work pulled to code P0303, P0304, Cylinder Mis-Fire Detected Cylinder 3, and 4.

Called the dealer had them look at. The pulled the same code, and connected the computer, said the engine is running fine. They deleted the code and said if it happens again to call them.

Two Months Later: K&N Typhoon Intake, Apexi N1 Catback,

Started it today to go to lunch no problems, got something to eat drove back to the parking lot. Started back to up to heat the cabin up since it was cold as CRAP, had that same little burp, and then the Check Engine light came on with the Cruise light flashing again.

Didn't have time to pull the code will do it tomorrow, and if it's the same I'll just delete.

FYI: Still runs fine
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Old 01-19-2007, 03:11 PM   #8
PS_REX
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Happened to me once too, but it wasn't a cold start. Stopped the car for about 5 min to run into a coffee shop, came out and started it up. Felt the misfire right away, and a few seconds later got a cel. Took it to the dealer and they said cylinder 1 misfire. They just deleted, reset, and said if it happens again they'd replace plugs, coils, wires. Hasn't happened since...that was about 6 months ago.
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Old 01-19-2007, 03:16 PM   #9
x99percent
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1) Turn key to "ON".
2) Wait for fuel pump to finish priming (<3 seconds).
3) Start car.

Has anyone thrown a misfire CEL after a cold start when following this startup sequence?
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Old 01-19-2007, 04:36 PM   #10
flycaster
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Unfortunately, yes.
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Old 01-19-2007, 04:42 PM   #11
drnick
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I had a similar issue when my car was still stock. Had a mis fire while I was letting the car warm up. After trying a few things the dealership finally figured out it was a bad injector seeing as the misfire followed when it was moved. If you have an 04 or 05 there is a service bulliten IIRC.
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Old 01-19-2007, 04:52 PM   #12
quickscooby
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Quote:
Originally Posted by x99percent View Post
1) Turn key to "ON".
2) Wait for fuel pump to finish priming (<3 seconds).
3) Start car.

Has anyone thrown a misfire CEL after a cold start when following this startup sequence?
Yes I've done that for years.

However, my setup and my misfires are probably irrelevant because I'm far from stock.
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Old 02-06-2007, 08:12 PM   #13
Car vs. Driver
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Got the same code today P0303 on my car ... pulled the code with my AP a few minutes ago and reset it. We'll see what happens, but my car does NOT like the sub 20F weather we've been having lately.

Fortunately, I'm going to Agile in a few weeks to get new plugs and a pro tune, so if it continues I'll have them check it out.
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Old 03-09-2007, 11:47 AM   #14
sonic_boost_wagon
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Quote:
Originally Posted by x99percent View Post
1) Turn key to "ON".
2) Wait for fuel pump to finish priming (<3 seconds).
3) Start car.

Has anyone thrown a misfire CEL after a cold start when following this startup sequence?
if you don't follow this in cold weather, you USUALLY get a misfire CEL.
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Old 10-22-2007, 12:31 PM   #15
SupraScooby
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Anyone ever find a solution to this problem? I'm getting tired of always pulling my codes...
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Old 10-23-2007, 11:17 AM   #16
SupraScooby
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Could a faulty 02 sensor contribute to these misfires?

Last edited by SupraScooby; 10-23-2007 at 11:31 AM.
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Old 10-23-2007, 11:39 PM   #17
flycaster
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There are lots of things that can be at fault: injectors, coils, tuning, dirty or bad MAF sensor, electrical shorts, lightened flywheels, faulty crank sensors, bad ECU, yada, yada, yada.

That said, this seems to happen most frequently to people with large after-market injectors and much of the time (nope, not all) it can be traced to a single bad or clogged injector. The drill is to clear it, and see if it comes back repeatedly. If it does, you can start by process of elimination to find the problem. OTOH, there are some cars, like mine, where everything checks out, you disable the misfire code and yet you still get a CEL - you live with it, or you keep clearing it and loose all your learned fueling and timing adjustments. If there was some way to turn down the sensitivity, it sure would be nice...

Last edited by flycaster; 10-23-2007 at 11:45 PM.
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Old 10-28-2007, 05:35 AM   #18
96golfin
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Any updates?
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Old 04-08-2015, 09:58 PM   #19
Mikevar94
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Anyone ever figure this out?
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