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Oct 27, 2009 | 10:22 PM

countrykid_86

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Engine Help

I have had a noise that seems to be coming from under the left valve cover. The noise started a couple months ago and has been getting progressively worse. It is a clatter/shatter type noise and is worse when the vehicle is cold or at lower RPM. I hooked it up to an AE scanner and got cylinder failures on #2 and #8. I concluded that one of these injectors must be going bad. I got two new remanufactured injectors and i just finished installing them. Just got back from driving it and the noise is obviously worse than before. I know that it will run funny until i get the air out the system, but this is still the same noise, only louder. I am really stumped and frustrated, does anyone have any ideas for me?

Is their ever an issue with injector timing?

If it is one of the other injectors, how do i diagnose it?

Oct 27, 2009 | 11:41 PM

TERSEJR

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From: CO.

Did you get any other codes like IDM faults or anything when you scanned it?

If you can, test the compression of the cylinders.

Oct 28, 2009 | 07:40 AM

countrykid_86

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It didn't pop any codes and it passed the buzz test. It had pretty high rotational velocity on cylinders #3 and #8, like a little over 3 was an average reading. Been thinking about it tonight, and since the noise is worse it must be because i changed out one of the wrong injectors and either 4 or 6 is faulty and the air in the system makes the noise louder. Otherwise the problem is not with the injectors and i have bigger issues like bent rods or worse. I did hydro-lock it slightly last night

, i didnt crank on it a bunch, it locked up right away and i stopped and jerked everything back out and then cranked it a while and got all of the fuel/oil out of the cylinders. After that everything was fine, but what if i had a bent rod and i tweeked it a little more. I am just brainstorming

, i don't want ot have to take it somewhere, especially not the dealer. The frustrating part is that it runs, it just sounds like **** and diagnosing it is a b***. Thanks for any help ahead of time guys!!

Oct 28, 2009 | 09:01 AM

miller_feed

Hook it, I'll pull it.

Joined: May 2007

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From: Grand Lake, La.

Have you changed the CPS lately? Seems the gray one will mess with the #3 and #8 injector codes on a few trucks. Did you check all the hold down bolts and rocker bolts?

Oct 28, 2009 | 09:10 AM

countrykid_86

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I have a grey CPS, I went in for the recall right after I bought the truck a couple years ago, I have regretted that mistake ever since. I ordered another grey one and changed them out about three months ago. Sure wish I could find an old black one!! I had already checked and re-torqued everything under the valve covers, I was hoping for a simple fix, at first.