Urgent Help Needed: Misfires after VCT replacement & Timing chain refresh
Thread Starter
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4wd Low
Joined: Jun 2012
Posts: 13
Likes: 0
Urgent Help Needed: Misfires after VCT replacement & Timing chain refresh
Vehicle:2007 lr3 4.4L
So I thought I just finished repairing the VCT cold start problem and refreshing the timing chain, but it appears I failed somewhere along the way.
I replaced all the timing components, except the actual VCT solenoids.
Bank 1 is where I think I had the VCT cold start problem but I replace both sprockets anyways.
I had no codes before the repair, but the start up banging had gotten really bad.
Follow the service manual exactly.
So the car will star but it runs kind of rough. It is spitting out a the following codes:
P0301,03,05,07: Cylinder 1,3,5,7 Misfire
P0300: Random/Multiple Misfires Detected
P0316 Engine misfire detected on startup
P0016:Crankshaft Position-Camshaft Position Correlation
P0026:Intake Valve Control Solenoid Circuit Range/ Performance
So I think that means it is confined to one bank.
But can anyone think of anything before I dig back into the engine? Could the solenoid have actually gone bad? I wasn't getting that code before the repair.
So I thought I just finished repairing the VCT cold start problem and refreshing the timing chain, but it appears I failed somewhere along the way.
I replaced all the timing components, except the actual VCT solenoids.
Bank 1 is where I think I had the VCT cold start problem but I replace both sprockets anyways.
I had no codes before the repair, but the start up banging had gotten really bad.
Follow the service manual exactly.
So the car will star but it runs kind of rough. It is spitting out a the following codes:
P0301,03,05,07: Cylinder 1,3,5,7 Misfire
P0300: Random/Multiple Misfires Detected
P0316 Engine misfire detected on startup
P0016:Crankshaft Position-Camshaft Position Correlation
P0026:Intake Valve Control Solenoid Circuit Range/ Performance
So I think that means it is confined to one bank.
But can anyone think of anything before I dig back into the engine? Could the solenoid have actually gone bad? I wasn't getting that code before the repair.
Thread Starter
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4wd Low
Joined: Jun 2012
Posts: 13
Likes: 0
Follow up question.
I noticed that after I had tightened down the sprocket bolts on Bank 1 then removed the "special tool" that the secondary chain would go a little slack. Now when it was in the tool the chain was nice and tight, but the second i would loosen that tool, it looked like the exhast cam would turn clockwise just a little. Now I had noted something like that when I took it apart, so I didn't think that was an big issue. but does anyone know if that sound right?
I noticed that after I had tightened down the sprocket bolts on Bank 1 then removed the "special tool" that the secondary chain would go a little slack. Now when it was in the tool the chain was nice and tight, but the second i would loosen that tool, it looked like the exhast cam would turn clockwise just a little. Now I had noted something like that when I took it apart, so I didn't think that was an big issue. but does anyone know if that sound right?
Baja
Joined: Aug 2013
Posts: 6,907
Likes: 792
From: Huntington Beach CA
Are the cam hold down tools clamped securely on the cams flat section?
I used s cheap tool set my last HG job and had some issues.
if there is the slightest gap that allows the cam to rotate that could be the problem.
I used s cheap tool set my last HG job and had some issues.
if there is the slightest gap that allows the cam to rotate that could be the problem.
Baja
Joined: Nov 2017
Posts: 5,020
Likes: 969
From: Green Bay, WI
Stupid question time. I have never set timing on this engine, but I assume the procedure it like all engines. You set the timing with the tools, then you crank the engine manually several revolutions with the tensioner loaded and check/adjust the timing again - repeat until it comes out exact consistently. Right?
