Engine noise, need help!
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Junior User
Joined: Nov 2005
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Engine noise, need help!
I just finished putting injectors in my truck yesterday morning. It eventually fired up and I took it out for about a half hour drive. Everything seemed fine other than the check engine light kept coming on and going off. I just figured that was the truck cleaning itself out and getting the air out of the fuel system. I parked the truck until I started up this morning. It idled fine for about 10 seconds and then I heard a clattering start up under the hood. I called the local diesel shop and they told me it was probably the new injectors and it was normal. So, I fired it back up and the same thing was happening and I noticed the exhaust sounded like it was blowing compressed air. What the heck is going on? The only thing I can figure is maybe an exhaust valve is bad or something else in the valve train.
Fleet Owner
Joined: Jun 2004
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From: Rio Rico, AZ.
Does the "compressed air" sound go away as soon as you tap the brake pedal?
You need to drive around 100 miles MINIMUM to get all the trapped air out of the HPOP and fuel rails for the injectors.
You need to drive around 100 miles MINIMUM to get all the trapped air out of the HPOP and fuel rails for the injectors.
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Junior User
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So am I to understand that the clattering noise coming from the top end is just the injectors getting broke in? I also failed to mention before, while I was driving it and while it was idling, it would intermittenly blow a decent amount of white smoke. That was also the case when I started it this morning with all the clattering, there was quite a bit of white smoke. As for the brake pedal, I did not try hitting the brakes, but I will try that tomorrow.
Post Fiend
Joined: Feb 2006
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From: Middle Tennessee
Yes, they will take a while to get all the air out of the system and some smoking will occur. They are not actually breaking in, rather getting the air out and likely some of the same in the HPO system as well.
The jet or compressed air sounds like your exhaust bypass valve is working. It aids in engine warmup and like Kwikk said, should disengage as soon as you touch the brake pedal.
The jet or compressed air sounds like your exhaust bypass valve is working. It aids in engine warmup and like Kwikk said, should disengage as soon as you touch the brake pedal.
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Junior User
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I guess the air noise in the exhaust sounds like it's a common occurance although I have never heard it like this before. The thing that is really concerning me is the hammering noise in the top end. It did not make this noise at all during the 30 minutes of drive time yesterday. Only after a short time idling this morning did it begin and it sounds like a valve slapping a piston. I sure hope not though. Also at the risk of sounding stupid, what does HPOP stand for. Sorry, I'm new to diesel terminology. Thanks guys.
Post Fiend
Joined: Jul 2005
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From: 21791
High Pressure Oil Pump. It uses engine oil to pressurize it to 500psi at idle to over 3000 psi at WOT. It is the hydraulic force used to pressurize the fuel to 20,000psi+ injection pressure. When you remove the injectors you get lots of air in the system, both the oil and fuel system. Since both of these are dead end, it means that if air gets in the system, the only way out is through the injector. That is why it takes so long, because each injector "eats" a small bit of oil and fuel every time it fires, and it takes so many fires to eliminate the air. That is what causing the noises, because the injectors aren't designed to pump air. You can get the engine up to operating temp and run it at a safe (you feel) high RPM (up to 3000RPM) for 10 minutes to purge the air out of the system, instead of driving 100 miles.
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Fleet Owner
Joined: Jun 2004
Posts: 25,090
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From: Rio Rico, AZ.
Well, I replaced all eight of my injectors last spring and I never had any hammering noises. It just ran a little rough for the first few minutes and no hammering or clattering. There was a good sized cloud of smoke when I first started it from all the oil that fell down the injector hole but then none whatsoever since then. So you may have a problem. But you need to remove all doubts and put some miles on that thing before you can be sure.
A sticky injector will sound like a connecting rod knocking. I am guessing you are hearing a lot of air going through your injectors, like Strokin_it is saying.
A sticky injector will sound like a connecting rod knocking. I am guessing you are hearing a lot of air going through your injectors, like Strokin_it is saying.
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Post Fiend
Joined: Feb 2006
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From: Middle Tennessee
Originally Posted by strokin_it7.3
Since both of these are dead end, it means that if air gets in the system, the only way out is through the injector.
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Junior User
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Very good question about the tool. I can answer it with an emphatic NO! Unfortunatley I have seen up close the effects of foreign objects falling into the internal components of a motor. A friend of mine lost an engine in a Mustang that way. For me it is always check and re-check. I am open to any possible answers to my problem though, so thanks for your reply.