Idle knock = bad injector
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Post Fiend
Joined: Jun 2004
Posts: 9,293
Likes: 10
From: Parker, CO
Idle knock = bad injector
My truck had an idle knock for several years now. Never bothered with messing with it.
Anyway, I went through the whole ordeal of putting in new injector o-rings.... only to find that the o-rings I bought were complete *****, and had to re-do it all again (that was another thread entirely). Yesterday I noticed the knock was worse than it ever was before.
I pinpointed it to the driver's side. So today I pulled the valve cover and started the engine. To my dismay, no knock. So I let it idle for a while. Started noticing that as it idled, the knock slowly returned. At the same time, I noticed #2 injector was pissing oil out the solenoid. As the knock got worse, more oil was pissing out the top of the injector and splattering everywhere. None of the others were doing this, and I could hear #2 knock louder and louder the longer the engine ran.
So, I have a bad injector. Just thought I would pass this on.
Anyway, I went through the whole ordeal of putting in new injector o-rings.... only to find that the o-rings I bought were complete *****, and had to re-do it all again (that was another thread entirely). Yesterday I noticed the knock was worse than it ever was before.
I pinpointed it to the driver's side. So today I pulled the valve cover and started the engine. To my dismay, no knock. So I let it idle for a while. Started noticing that as it idled, the knock slowly returned. At the same time, I noticed #2 injector was pissing oil out the solenoid. As the knock got worse, more oil was pissing out the top of the injector and splattering everywhere. None of the others were doing this, and I could hear #2 knock louder and louder the longer the engine ran.
So, I have a bad injector. Just thought I would pass this on.
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Post Fiend
Joined: Jun 2004
Posts: 9,293
Likes: 10
From: Parker, CO
I have a paypal account you can donate to. 
Been over 2 years now. Probably 90 something thousand miles when I first noticed it. Happened a few months after I installed the regulated return, but before I put on the Termy pumps. Got just over 130K now. Knock was much worse yesterday than I ever heard it before, which is why I popped off the valve covers.
Been over 2 years now. Probably 90 something thousand miles when I first noticed it. Happened a few months after I installed the regulated return, but before I put on the Termy pumps. Got just over 130K now. Knock was much worse yesterday than I ever heard it before, which is why I popped off the valve covers.
Post Fiend
Joined: Feb 2008
Posts: 10,977
Likes: 5
From: Lancaster, Pa.
Interesting Curtis, notice any oil down on the dipstick between oil changes, burning oil and such?? Just wondering besides the knock would there be other signs?? Thats not a whole lot of miles.
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Post Fiend
Joined: Nov 2007
Posts: 9,549
Likes: 14
From: Payson, AZ
Thanks for the heads up Curtis.
Was oil coming out of the return spigot? If it was coming out both places the plunger must not have been getting much oil pressure. You have to wonder how much fuel that injector was putting out, if any. How was it running?
Was oil coming out of the return spigot? If it was coming out both places the plunger must not have been getting much oil pressure. You have to wonder how much fuel that injector was putting out, if any. How was it running?
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Post Fiend
Joined: Jun 2004
Posts: 9,293
Likes: 10
From: Parker, CO
It was burning oil with messed up o-rings. But with the way the oil was leaking past the poppets, it would just go back into the crankcase.
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Post Fiend
Joined: Jun 2004
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From: Parker, CO
With twin pumps, I have PLENTY of oil
Probably why I was still able to maintain 3000 psi of ICP with all 8 injector o-rings failing.
Post Fiend
Joined: Feb 2008
Posts: 10,977
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From: Lancaster, Pa.
Got it Curtis and thanks for posting this info up. Are you just replacing that bad one or like Joe said, upgrading??
Post Fiend
Joined: Nov 2007
Posts: 9,549
Likes: 14
From: Payson, AZ
It was running fine. There was oil out the spigot, and it was about the same pace as the other injectors. It's just additional oil was spraying out the top of that one as well.
With twin pumps, I have PLENTY of oil
Probably why I was still able to maintain 3000 psi of ICP with all 8 injector o-rings failing.
With twin pumps, I have PLENTY of oil
Probably why I was still able to maintain 3000 psi of ICP with all 8 injector o-rings failing.
Post Fiend
Joined: Mar 2007
Posts: 26,966
Likes: 50
From: Texas
Where's your gray vs. black CPS thread? How did #2 look on rotational velocity? Have you checked it again lately to see what the computer shows? Seen any MPG differences?
Edit: Found it
1.2 isn't very much at all. Hopefully it's showing worse now, otherwise the readings are starting to sound useless.
Edit: Found it
1.2 isn't very much at all. Hopefully it's showing worse now, otherwise the readings are starting to sound useless.
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Post Fiend
Joined: Jun 2004
Posts: 9,293
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From: Parker, CO
If I had the money right now, I would upgrade. But, I don't, so I'm looking for anyone who wants to trade a stock AD injector as a core.