Another gremlin...this time misfiring

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Old Jun 6, 2004 | 12:24 PM
  #1  
specv5150's Avatar
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From: San Marcos, TX
Default Another gremlin...this time misfiring

Here is my setup
greddy kit
DSM 450
AFC Hack

I set my AFC setting according to the AFC Hack thread

I followed the wiring diagram off of here as well for the DSM 450's

I finally fixed my oil leak and now I am having another problem

car idles around 450 or so. When I give it gas it will sputter here and there all the way to 5.5K where it will not rev anymore. Then when I am letting off of it, it feels like its about to stall but will stay on (nuetral gear). Anyway I checked the codes and I got 71, 72, 73, 74. Cylinder misfires. What would cause that? I am clueless to this stuff. This is my first tiem installing a turbo and injecot4rs and what not. Should start with the spark plugs and wires??
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Old Jun 6, 2004 | 12:35 PM
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From: San Marcos, TX
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Also, I dont think it is the injectors as they were cleaned and flow tested before I got em AND I installed them in April and they just started doing this NUT I havent taken the car off jackstands since April. (well except once but it was towed) When I originally installed the injecotrs and AFC, they workled perfectly (too perfectly as I had a massive fuel leak too). However, to rule out the possibility, how do I check to see if the the injectors are the cause or not.


And here are my AFC settings
lo-98%
hi-99%
1-4 -40%
4.5 -37%
5 -33%
5.5-7 -30%
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Old Jun 6, 2004 | 03:30 PM
  #3  
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Oklay after searching a bit, I went out and checked my wires for looseness and for ***** and giggles checked the spark plugs. Cylinder 1 had a bunch of oil in it but the other 3 didnt. I am going to take the valve cover off and clean that spark plug and see what happens. But if only one had oil in it...why would I get a misifre in all 4 cylinders
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Old Jun 6, 2004 | 04:28 PM
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Default Re: (specv5150)

I'm not exactly sure how the ECU determines what cylinder has misfired. But when one of my injectors was stuck open causing misfire in that cylinder, the ECU showed 2 cylinders were misfiring.

Oil on the spark plug isn't good.

You could get dumping in too much fuel causing the misfires, that would be my guess.
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Old Jun 6, 2004 | 05:57 PM
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hmmmmm........I will try leaning it out somemore with the AFC???

Also I am going tot ry the valve cover kit replcement. See what happens. I saw alot fo threads where that is all it was. If that doesnt work. Spark plugs and wires will be next. if that doesnt work. I will ge the injecotrs cleaned/repaired. Unless someone wants to buy ti all so I can get a B18B
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Old Jun 6, 2004 | 06:16 PM
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From: MSP
Default Re: (specv5150)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by specv5150 &raquo;</TD></TR><TR><TD CLASS="quote">hmmmmm........I will try leaning it out somemore with the AFC???

Also I am going tot ry the valve cover kit replcement. See what happens. I saw alot fo threads where that is all it was. If that doesnt work. Spark plugs and wires will be next. if that doesnt work. I will ge the injecotrs cleaned/repaired. Unless someone wants to buy ti all so I can get a B18B</TD></TR></TABLE>

Your just wasting money doing that. Find the problem and fix it.

If it ain't broke, don't fix it.
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Old Jun 6, 2004 | 06:37 PM
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gunmetalcivic's Avatar
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Default Re: Another gremlin...this time misfiring (specv5150)

when i blew my piston ring landing i got misfire codes and oil on my spark plugs as well. hopefully yours isnt as bad as mne was.
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