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Urgent Help Needed: Misfires after VCT replacement & Timing chain refresh

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Urgent Help Needed: Misfires after VCT replacement & Timing chain refresh

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Old 11-07-2018, 01:30 PM
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Default 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.




 
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Old 11-07-2018, 02:56 PM
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You sure you got the cams timed properly?
 
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Old 11-07-2018, 03:25 PM
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Yeah, Bank one timing is off.
 
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Old 11-07-2018, 07:03 PM
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That was what I had assumed. Just wanted confirmation that there wasn't something I was missing.
 
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Old 11-07-2018, 07:39 PM
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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?
 
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Old 11-07-2018, 08:26 PM
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Is the secondary tensioner new? It should not move after timing is set.
 
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Old 11-07-2018, 08:29 PM
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What he said
 
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Old 11-07-2018, 08:40 PM
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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.
 
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Old 11-07-2018, 09:23 PM
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Abran,
I thought that I had the tool issues, I have since ordered the more oem type tool.


Yes the seconday tensioner is new.
 
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Old 11-07-2018, 10:49 PM
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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?
 
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