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Old 04-01-2012, 04:06 PM   #1
Daniel's05WRX
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Default Major misfire issues need help

Ok so after my build I'm getting misfires on all cylinders car runs decent when cold but gets worse as it gets to operating temp and shortly after runs horrible and starts shooting flames out of the downpipe... Any thoughts?
I'm running a built 2.5 block
DW 1300 cc injectors
DW 300 lph fuel pump
Bc over sized valves
Bc springs and retainers
Sti cams
Wrx heads with a few cc's removed and corners smoothed to prevent detonation
TD04
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Old 04-01-2012, 04:34 PM   #2
Chino Bling
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What is your ECU/Engine Management setup?

and aren't those injectors a little overkill for a TD04?
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Old 04-01-2012, 04:45 PM   #3
Daniel's05WRX
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Stock ecu, break in tune from Keith @ Awd
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Old 04-01-2012, 05:16 PM   #4
atomicfire
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can you post a learning view
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Old 04-01-2012, 06:44 PM   #5
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Who built the engine?
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Old 04-01-2012, 06:59 PM   #6
Daniel's05WRX
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Quote:
Originally Posted by atomicfire
can you post a learning view
I've still got to data log... Gonna do that tonight or tomorrow
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Old 04-01-2012, 07:00 PM   #7
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Quote:
Originally Posted by SGC2CIC
Who built the engine?
Me... Engine starts just fine idles perfect just misses under load... Heads were built by scroggins machine in Houston... Very good shop
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Old 04-01-2012, 07:28 PM   #8
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Are your plugs and coil packs good?

And that is a hell of a lot of injector and fuel pump for that TD04. Could have something to do with the unburned gasoline that keeps lighting on fire at your downpipe.
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Old 04-01-2012, 07:29 PM   #9
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I bet u are too rich, and that is ur miss.
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Old 04-01-2012, 07:49 PM   #10
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Quote:
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Could have something to do with the unburned gasoline that keeps lighting on fire at your downpipe.
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Old 04-01-2012, 08:05 PM   #11
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yeah you need to dump those injectors for something smaller.after that check to see that all timing marks line up. jumping time happens (not likely ) my money is on injectors
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Old 04-01-2012, 09:19 PM   #12
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Keith still thinks injectors as well. Could still test coil packs though just to rule it out.
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Old 04-01-2012, 09:56 PM   #13
Daniel's05WRX
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Quote:
Originally Posted by Spider Pig
Are your plugs and coil packs good?

And that is a hell of a lot of injector and fuel pump for that TD04. Could have something to do with the unburned gasoline that keeps lighting on fire at your downpipe.
I'm planning on going 30r and e85... Plugs are new and coil packs worked fine before build, also a buddy used one for a week while he waited on his new one to come in on his 04 Sti and it worked just fine
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Old 04-01-2012, 09:59 PM   #14
Daniel's05WRX
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Quote:
Originally Posted by txjunglist
yeah you need to dump those injectors for something smaller.after that check to see that all timing marks line up. jumping time happens (not likely ) my money is on injectors
Timing is perfect had a small oil leak @ the oil pump and retimed it @ wk Friday at gillman... Only thing that makes me not think injectors is that it's missing on all cylinders
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Old 04-01-2012, 10:01 PM   #15
Daniel's05WRX
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Quote:
Originally Posted by grimlin
Keith still thinks injectors as well. Could still test coil packs though just to rule it out.
Yeah I'm hoping injectors, I'm just stumped... I'm going to replace my turbo inlet and check my whole vacuum and intake system tomorrow
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Old 04-01-2012, 10:32 PM   #16
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Quote:
Originally Posted by Daniel's05WRX View Post
Me... Engine starts just fine idles perfect just misses under load... Heads were built by scroggins machine in Houston... Very good shop
I just had this exact same problem. It ran fine through the whole RPM range, idled great, but as soon as I hit about 18psi (tuned for 24), it would start missing pretty bad. And it wouldn't be a constant dead miss, it would miss once, climb a couple of RPM, miss again, climb a couple of RPM, miss again.. I kept checking datalog and I wouldn't see anything except boost jump around. Only codes I would get were random misfire codes and every now and then it would name a particular cylinder misfire.. The one I saw most was on #3, so I swapped coil packs with #1 and the misfire code for #1 would pop more than the others.. so I bought a set of coil packs from a fellow NASIOC member, installed one on #1 cylinder and haven't had an issue since

Last edited by PostaL cm; 04-01-2012 at 10:39 PM.
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Old 04-01-2012, 10:36 PM   #17
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I actually came across this when I was having issues, it's what pointed me to my coil pack. Check it out: http://www.mkivsupra.net/vbb/showthr...fire-diagnosis) (yes, I know it's a supra board, but boosted is boosted! )
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Old 04-01-2012, 10:46 PM   #18
Daniel's05WRX
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Quote:
Originally Posted by PostaL cm
I actually came across this when I was having issues, it's what pointed me to my coil pack. Check it out: http://www.mkivsupra.net/vbb/showthr...fire-diagnosis) (yes, I know it's a supra board, but boosted is boosted! )
Mine is missing @ like 8psi and sometimes less then that and consistently bad
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Old 04-02-2012, 04:51 AM   #19
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Do you still want me to send you the coilpacks to test? Just call John at the shop and let him know yes or no. Hopefully you'll get it figured out soon.
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Old 04-02-2012, 08:30 AM   #20
Daniel's05WRX
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Quote:
Originally Posted by grimlin
Do you still want me to send you the coilpacks to test? Just call John at the shop and let him know yes or no. Hopefully you'll get it figured out soon.
Yes plz send them
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Old 04-02-2012, 09:08 AM   #21
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Post learning view please
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Old 04-02-2012, 09:47 AM   #22
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I have a set of 750 injectors I'll trade you . I'll come by today and pull the learning view.
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Old 04-02-2012, 08:22 PM   #23
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he needs the 1300 for e85. what is your EM?



this is what I think.

I have heard DW have problems above 1000cc . I have a set now that are in route to be checked
I also believe you should be using a stock injector on stock tune to break that engine in as these demons will rear their heads.(less is more on break in)

Last edited by txjunglist; 04-02-2012 at 10:01 PM.
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Old 04-02-2012, 08:30 PM   #24
Daniel's05WRX
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Quote:
Originally Posted by txjunglist
he needs the 1300 for e85. what is your EM?
Just stock ecu w Awd tune
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Old 04-02-2012, 09:13 PM   #25
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Quote:
Originally Posted by txjunglist View Post
he needs the 1300 for e85. what is your EM?
He'd need the 1300cc ones for E85 if he was running a bigger turbo, but not for a TD04. My 850cc injectors are good for E85 and my 20g.
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