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Random Misfire after H/C ?

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Old Jun 13, 2003 | 07:49 AM
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Default Random Misfire after H/C ?

Anyone know what could be the cause? I've taken the drivers side plugs out and inspected them they seem fine but i figured it was probably a broken plug from my headers rattling around in there when i was trying to realign them. Oh if it make a difference Stg 2 heads, TR224 114, ASP, Mac Headers, SY3500, Ported MAF + TB. Maybe i could just need tuning?

Thanks

D
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Old Jun 14, 2003 | 11:21 PM
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Default Re: Random Misfire after H/C ?

Yeah, that's normal for doing a cam upgrade. You'll have to go in with LS1edit and desensitize the the miss-fire detection. Most people just set the value to 32000. BTW, how do you like the cam? That's the one I'm going to installing soon.
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Old Jun 16, 2003 | 11:28 AM
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Default Re: Random Misfire after H/C ?

normal.. any cam is gonna make misfires. I toggled my po3000 code off on edit. I tired setting the tables to 32000, but that only worked for like a week.

I get about 10-15misfires on each cylinder at idle.. its normal
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Old Jun 16, 2003 | 11:58 AM
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Default Re: Random Misfire after H/C ?

Your converter will not stay locked until you get that fixed with edit.
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Old Jun 16, 2003 | 12:51 PM
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Default Re: Random Misfire after H/C ?

Thanks. But will a dyno tune take care of it? And i love the cam it sounds good!!

Thanks
D
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Old Jun 16, 2003 | 01:43 PM
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Default Re: Random Misfire after H/C ?

I'm getting the same code in my 02 Z06 after a cam install. What tabs do u change the #'s in. Do u just change all the #'s that are 327## something? Thanks.
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Old Jun 16, 2003 | 02:07 PM
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Default Re: Random Misfire after H/C ?

there is nothing u can do about misfires. Its just part of the cam life. You can raise the idle to help a little, but you still will have them. To turn the SES off you just toggle the p0300 code off on edit.

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Old Jun 16, 2003 | 02:09 PM
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Default Re: Random Misfire after H/C ?

Go to "Engine Calibration" ->LOW RPM ->Edit whole table->VALUE=32000->fill value
->LOW RPM by CYL->Edit whole table->VALUE=32000->fill value.
->IDLE by CYL->Edit whole table->VALUE=32000->fillvalue.

You can review this in Edit User's Guide.
joel(Bink)

I Had this Entered WRONG it is Now Correct- thanks DRAGON!
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Old Jun 16, 2003 | 02:12 PM
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Default Re: Random Misfire after H/C ?

Modify the following test tables to 32000:

Idle by Cyl
Low RPM by Cyl
Low RPM

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Old Jun 16, 2003 | 02:13 PM
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Default Re: Random Misfire after H/C ?


there is nothing u can do about misfires. Its just part of the cam life. You can raise the idle to help a little, but you still will have them. To turn the SES off you just toggle the p0300 code off on edit.


If you do this then a true "misfire" is not reported. If you follow the above Edit then they will be reported via the HIGH RPM table.My .02 joel(Bink)
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Old Jun 16, 2003 | 02:13 PM
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Default Re: Random Misfire after H/C ?

Go to "Engine Calibration" ->LOW RPM ->Edit whole table->VALUE=32000->fill value
->MED RPM->Edit whole table->VALUE=32000->fill value.
You can review this in Edit User's Guide.
joel(Bink)
Dang. You beat me to the reply
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Old Jun 16, 2003 | 02:19 PM
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Default Re: Random Misfire after H/C ?


there is nothing u can do about misfires. Its just part of the cam life. You can raise the idle to help a little, but you still will have them. To turn the SES off you just toggle the p0300 code off on edit.


If you do this then a true "misfire" is not reported. If you follow the above Edit then they will be reported via the HIGH RPM table.My .02 joel(Bink)
Ditto the above.
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Old Jun 16, 2003 | 02:29 PM
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Default Re: Random Misfire after H/C ?

Go to "Engine Calibration" ->LOW RPM ->Edit whole table->VALUE=32000->fill value
->MED RPM->Edit whole table->VALUE=32000->fill value.
You can review this in Edit User's Guide.
joel(Bink)
Dang. You beat me to the reply
With the wrong info!!!
I Corrected my post- should Not Edit the Med RPM table...Instead Edit "Low RPM by Cyl" and "Idle by Cyl" and "Low RPM"-according to users manual.Dragon had it right!! My Bad!!!!
joel(Bink)
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Old Jun 16, 2003 | 02:36 PM
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Default Re: Random Misfire after H/C ?

Do u edit the whole table or just from 0 to 5?
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Old Jun 16, 2003 | 06:34 PM
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Default Re: Random Misfire after H/C ?

Entire table.

Bottom right corner has Edit Whole Table. In place of the word "Value", type in 32000. Then click fill value.
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Old Jun 16, 2003 | 06:39 PM
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Default Re: Random Misfire after H/C ?

Go to "Engine Calibration" ->LOW RPM ->Edit whole table->VALUE=32000->fill value
->MED RPM->Edit whole table->VALUE=32000->fill value.
You can review this in Edit User's Guide.
joel(Bink)
Dang. You beat me to the reply
With the wrong info!!!
I Corrected my post- should Not Edit the Med RPM table...Instead Edit "Low RPM by Cyl" and "Idle by Cyl" and "Low RPM"-according to users manual.Dragon had it right!! My Bad!!!!
joel(Bink)
No problem dude
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Old Jun 30, 2003 | 11:43 AM
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Default Re: Random Misfire after H/C ?

I am still get misfires when cruising. Enough that my TC unlocks. Any ideas??
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Old Jul 3, 2003 | 01:26 AM
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Default Re: Random Misfire after H/C ?

ttt
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Old Jul 4, 2003 | 12:00 AM
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Default Re: Random Misfire after H/C ?

After LS1 HOT CAM install, verter went crazy, not lock up or lock up go a mile and then unlock
wasted 1 week in trans shop, 1 day at dealer and reflash PCM still no help after 2-3 weeks use EDIT set misfires to min =139 and max =140 and 90 days later have NOT a single problem
good luck Johnny
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Old Aug 22, 2003 | 09:53 PM
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Default Re: Random Misfire after H/C ?

How can you tell if your converter is locking/unlocking?
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