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Old January 22nd, 2017, 03:05 PM   #81
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John, take a look at the crank relearn. I fought this for a year and this solved my random misfires.

http://www.silveradosierra.com/vorte...al-t12179.html
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Old January 22nd, 2017, 07:00 PM   #82
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Is it lean.... Seen lots of cracked intakes creating a lean miss on specific cylinders.
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Old January 22nd, 2017, 07:02 PM   #83
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Quote:
Originally Posted by chevotass View Post
i have a MAF you can borrow to test if needed.
Thanks. I may do that before I buy one.
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John, take a look at the crank relearn. I fought this for a year and this solved my random misfires.

http://www.silveradosierra.com/vorte...al-t12179.html
I will have to see if I can come up with a scanner that can do that. I read a little about people fighting with case learn and wondered if it could be playing a role.

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Old January 23rd, 2017, 08:58 AM   #84
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Is it lean.... Seen lots of cracked intakes creating a lean miss on specific cylinders.
I'll pull better numbers tonight. I think it was < 5%.

Was looking and 3 to 4 bolt throttle body adapters are on summit for $25-50, so I could likely get to a TBSS intake for around $100 if I have to change intakes. edit: or it could tumble into a giant pile of just 1 more thing...

Last edited by JohnnyJ; January 23rd, 2017 at 10:02 AM.
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Old January 23rd, 2017, 10:54 AM   #85
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edit: or it could tumble into a giant pile of just 1 more thing...
I think this scenario has already been covered
How to Survive the Project From Hell? - Great Lakes 4x4. The largest offroad forum in the Midwest

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Old January 23rd, 2017, 12:16 PM   #86
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I think this scenario has already been covered
How to Survive the Project From Hell?

Yep, that's why I'm screwing around with getting the engine running good in the donor. It's cheaper than starting and restarting the project a few times.
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Old January 23rd, 2017, 01:07 PM   #87
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Quote:
Originally Posted by JohnnyJ View Post
I'll pull better numbers tonight. I think it was < 5%.

Was looking and 3 to 4 bolt throttle body adapters are on summit for $25-50, so I could likely get to a TBSS intake for around $100 if I have to change intakes. edit: or it could tumble into a giant pile of just 1 more thing...
I have adapter here brand new in the package. Dont go buy one
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Old January 23rd, 2017, 08:30 PM   #88
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Ok
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Old February 4th, 2017, 10:10 AM   #89
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This is engine running about 2500rpm in 2nd gear down a flat road in steady state. Short term keeps flipping. Stays under 10%. Long terms are under 5%.

Misfire zone is between 1500-3000. All else seems ok.

Red : Misfire Cylinder 5 (one of 4 cylinders misfiring), counts 0 to 80, resets and starts counting again
Green : Fuel Trim Long Term Bank 1, sits at 4
Blue: Fuel Trim Short Term Bank 1, switches between +6/-2
Purple: Fuel Trim Long Term Bank 2, sits at just over 2
Yellow: Fuel Trim Short Term Bank 2, switches between +4/-4

Last edited by JohnnyJ; February 4th, 2017 at 10:43 AM.
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Old February 4th, 2017, 10:18 AM   #90
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Lost some resolution on upload.

Red : Fuel Trim Long Term Bank 1, sits at 4
Green: Fuel Trim Short Term Bank 1, switches between +6/-2
Blue: Fuel Trim Long Term Bank 2, sits at just over 2
Purple: Fuel Trim Short Term Bank 2, switches between +4/-4



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Last edited by JohnnyJ; February 4th, 2017 at 10:33 AM.
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Old February 4th, 2017, 11:22 AM   #91
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Well call me an idiot but I don't know what any of that means.
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Old February 6th, 2017, 05:55 AM   #92
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Which 4 cylinders misfiring?
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Old February 6th, 2017, 06:06 AM   #93
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I see 2 5 6 8.

Firing order is. 1 8 7 2 6 5 4 3

No counts on 7 or 3?

Wondering cam vs crank sensor....like slack in chain
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Old February 14th, 2017, 07:10 AM   #94
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Not sure, but I said f-it and decided to start pulling the drivetrain. Pulled the exhaust manifolds that were leaking like crazy. Was looking to see if I could fix driver's head stud, but decided it was pretty well buried and easier to fix on the stand. Will pull engine apart to check for wear while on the stand.

Spent the rest of the day under the vehicle pulling shafts, exhaust, and unplugging everything. Still have a bunch to disconnect before pulling the drivetrain out.

Last edited by JohnnyJ; February 14th, 2017 at 07:17 AM.
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Old February 14th, 2017, 07:43 AM   #95
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I would start with a cam/crank relearn once it's in its new home and see if that clears up the misfires.

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Old February 14th, 2017, 08:28 AM   #96
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Quote:
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I would start with a cam/crank relearn once it's in its new home and see if that clears up the misfires.
My Tech2 source dried up, but yeah, it's on the list.
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Old February 14th, 2017, 09:06 AM   #97
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Quote:
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My Tech2 source dried up, but yeah, it's on the list.
Most snap on scanners can do it and I know my launch scanner can do it

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Old February 14th, 2017, 09:22 AM   #98
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were the exh manifolds leaking before or after the O2?
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Old February 14th, 2017, 09:25 AM   #99
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Before, the manifolds don't have an O2 port in them.
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Old February 14th, 2017, 03:04 PM   #100
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Good point @Bones.
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