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      04-12-2014, 10:31 AM   #1
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HELP! 335i missfire (not coils or plugs)

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Last edited by 335BMW; 04-29-2014 at 08:46 AM.
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      04-12-2014, 12:59 PM   #2
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broken gasket is my guess
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      04-12-2014, 02:23 PM   #3
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100% can be injectors or pump or fuel sensor.
Swap injector from that cylinder are code it and see if it transfers. Ussually pump or fuel sensor throw a code so I'm sure it's prob injector.
Not sure why you would get all new plugs and sparks if it was only happening on cylinder 6
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      04-12-2014, 04:25 PM   #4
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Last edited by 335BMW; 04-29-2014 at 08:23 AM.
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      04-12-2014, 05:18 PM   #5
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Quote:
Originally Posted by tsavage View Post
Thanks, is it normal for injectors to go all if a sudden and be completely farked? Also, it's throwing no codes since clearing them and still running terribly?

I changed all of the coils as it has never been done. The plugs just in case. We'd driven 440kms to perth and back, so didn't want to leave to chance.

Cheers.
sounds like fuel to me.
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      04-12-2014, 07:00 PM   #6
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Hold on, so did you change the injector or not?

If you did, was it coded in? It's not a simple swap and drop thing. Needs to be coded.

The other thing is, if the injector you purchased was a newer part number, the whole bank needs to be swapped - can't do just the one.
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      04-12-2014, 07:06 PM   #7
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If the new plug was wet with fuel- it is probably injector #6 stuck open.
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      04-12-2014, 08:26 PM   #8
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Sounds like a hpfp to me! (you mentioned she's hard to crank!)

Generally when injectors go i have read that they give you an extremely rough idle - hows it idling? Does it blow excess fuel/black smoke on startup?

Have you tried to physically remove the jb4? Sometimes guys have issues and physically remove the tune and it comes good (wiring issue)

In summary though sounds like a fuel pump!
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      04-12-2014, 09:29 PM   #9
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Last edited by 335BMW; 04-29-2014 at 08:24 AM.
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      04-13-2014, 12:55 AM   #10
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Quote:
Originally Posted by tsavage View Post
_ink, haven't changed the injectors yet. Yes, will have to have them programmed in.

Shane, thanks. It's super rough at idle, no smoke at all.

I haven't changed the pump yet so could be an issue. Wouldn't it throw a pump/pressure code though?

Am going to rip out the JB4 when we get her home. Will let you know what happens. She's on the trailer right now, only 2 hours driving left
+1 on possibilities on HPFP.
With my experience it will be rough on idle and it will throw a misfiring code as soon as I give it a slight nudge on throttle.
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      04-13-2014, 02:18 AM   #11
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Quote:
Originally Posted by tsavage View Post
_ink, haven't changed the injectors yet. Yes, will have to have them programmed in.

Shane, thanks. It's super rough at idle, no smoke at all.

I haven't changed the pump yet so could be an issue. Wouldn't it throw a pump/pressure code though?

Am going to rip out the JB4 when we get her home. Will let you know what happens. She's on the trailer right now, only 2 hours driving left
Hmm well a leaky injector will generally blow smoke on startup (excess fuel not blue smoke associated with oil)

HPFP failures don't always give fuel pump related code, what codes exactly are you getting?
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      04-13-2014, 06:53 AM   #12
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Last edited by 335BMW; 04-29-2014 at 08:24 AM.
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      04-13-2014, 07:07 AM   #13
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Last edited by 335BMW; 04-29-2014 at 08:24 AM.
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      04-13-2014, 08:08 AM   #14
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So all of your mods have been installed for quite a while before this issue with no drama's?

Injectors or HPFP can just crap out without warning unfortunately, someone with much more actual personal experience such as peter at advan will chime in soon no doubt!
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      04-13-2014, 03:49 PM   #15
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I'd be compression testing it.
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      04-13-2014, 06:55 PM   #16
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Last edited by 335BMW; 04-29-2014 at 08:24 AM.
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      04-13-2014, 09:49 PM   #17
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Quote:
Originally Posted by tsavage View Post
The only things new are the downpipes. Which could explain it. It's relatively new to higher boost levels. Only ever ran it on map 1 and 5 before the DPs...
How long have the DP's been on for?

Did you just get them on prior to racewars, or had you been driving the car for a few weeks prior? (the primary O2 sensors could be arsed about when they were re-installed - but this would be immediately obvious running like shit)

I'm guessing the car was driving fine, then your car crapped itself @ racewars? (HPFP most likely)
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      04-14-2014, 12:15 AM   #18
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Last edited by 335BMW; 04-29-2014 at 08:24 AM.
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      04-14-2014, 01:07 AM   #19
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I would check the fuel pressures both low and high using Autologic, But as you don't have that luxury i would replace the HPFP.
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      04-14-2014, 08:15 AM   #20
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Racewars just reminds me of FnF.
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      04-14-2014, 06:08 PM   #21
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Last edited by 335BMW; 04-29-2014 at 08:24 AM.
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      04-14-2014, 06:09 PM   #22
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It's similar... In the middle of nowhere. Check out their Facebook page for pics

Quote:
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Racewars just reminds me of FnF.
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