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Old 08-21-2006, 04:56 PM   #1 (permalink)
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How to tell if the injector pump is going bad

I'm curious as to the symptoms of an injector pump going bad. I'm not sure as the previous history of the IP on my truck, it has paint on the IP adjustment screws preventing tampering, is this typical of an original IP or a rebuild?

At 186k miles I would have though that the original IP would have been changed out ages ago.
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Old 08-21-2006, 08:39 PM   #2 (permalink)
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Re: How to tell if the injector pump is going bad

<font color="green">There is no set in concrete life-span for injector pumps.

I have seen abused, neglected, pumps that never had a regular filter change, last for a million miles.

I have also seen the same brand/style pump, cared for religiously, give it up at less than 50,000.

A sure sign of pump weakening is having to crank a long time before starting.

Of course, with an IDI engine, this is a symptom of more than a dozen possibilities.

Weakening down, like a stopped up fuel filter will do, is also a good indication of a pump in need of rebuilding. </font>
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Old 08-21-2006, 10:30 PM   #3 (permalink)
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Re: How to tell if the injector pump is going bad

Well the truck has good power but a loud knocking sound is coming from it.

The truck starts right up but the knocking noise comes and goes after the engine gets warm. It sounds like it may be coming from the IP, but it's loud underneath the engine.

I sure hope that I dont have a rod knock, I don't think so as the knocking noise isnt constant it will come and go.

I really want to make sure it's an IP before I lay down another 400 bucks on this truck.
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Old 08-22-2006, 12:41 AM   #4 (permalink)
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Re: How to tell if the injector pump is going bad

<font color="green"> I don't think it is the injector pump.

If it is the pump knocking, it will soon be obvious.

I don't believe the fix is going to be so easy as replacing the pump. </font>
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Old 08-22-2006, 09:46 AM   #5 (permalink)
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Re: How to tell if the injector pump is going bad

Alot of the signs I'm hearing/seeing are pointing to a leaky exhaust manifold or pipe.

Engine power is just fine. I've posted a similar question under what a bad exhaust gasket sounds like. Judging from the noise it sounds like a pumping noise.
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Old 08-22-2006, 02:46 PM   #6 (permalink)
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Re: How to tell if the injector pump is going bad

Well with another friend listening to the engine, the noise is up high in the engine.

I may have to bleed the injectors and see if the noise goes away.
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Old 08-22-2006, 05:58 PM   #7 (permalink)
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Re: How to tell if the injector pump is going bad

loose injector or glo plug???
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Old 08-22-2006, 07:02 PM   #8 (permalink)
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Re: How to tell if the injector pump is going bad

I think I found the cause, loose vacuum fitting. The sound was coming from the area of the brake booster, when I fiddled with the elbow on the booster, the noise went away.
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Old 08-22-2006, 08:26 PM   #9 (permalink)
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Re: How to tell if the injector pump is going bad

WHAT???? [img]/ubbthreads/images/graemlins/confused.gif[/img] [img]/ubbthreads/images/graemlins/confused.gif[/img] [img]/ubbthreads/images/graemlins/confused.gif[/img]
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Old 08-22-2006, 08:41 PM   #10 (permalink)
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Re: How to tell if the injector pump is going bad

Not sure yet, but I'm certain that there is a leaking vacuum fitting on the driver's side the fire wall.

It's complicated, but the signs are there.
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Old 08-23-2006, 06:30 PM   #11 (permalink)
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Re: How to tell if the injector pump is going bad

The pump's general condition can be determined by checking the timing, Assuming the timing has been constant, a worn pump will make the timing off.
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Old 08-23-2006, 10:10 PM   #12 (permalink)
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Re: How to tell if the injector pump is going bad

Well the truck's running fine, it's this intermittent chugging noise that is driving me crazy.

The truck runs fine, doesn't miss so I know it's not in the valve train or the injection system, it sounds like it's coming from the area of the brake master cylinder and I'm now thinking that it's some sort of intermittent vacuum leak.
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Old 08-24-2006, 02:53 PM   #13 (permalink)
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Re: How to tell if the injector pump is going bad

Ok I took off the air cleaner and the noise is coming right from the air inlet tube to the turbo, it sounds like a thwock thwock noise.

Engine doesn't miss a beat. I took off the CDR to the intake tube (I have a Hypermax system) to see if maybe the CDR was flapping, no change in sound.

What could be causing this? I sure hope it's not a dropped valve, the noise comes and goes, not something you would expect of a bad valve or broken valve spring.
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Old 08-31-2006, 06:23 PM   #14 (permalink)
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Re: How to tell if the injector pump is going bad

Ok the truck really lunched this afternoon.

Lots of black smoke, really loud knocking noise, and over heating.

Please tell me this is the injector pump. The truck was running fine the past few weeks. It did this before I put 8 new injectors in. What gives? [img]/ubbthreads/images/graemlins/shrug.gif[/img]

Also, looks like there is fuel in the crank case, the engine is over full on oil and I filled it properly last week. The lift pump is brand new as well.
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Old 08-31-2006, 10:28 PM   #15 (permalink)
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Re: How to tell if the injector pump is going bad

why do you keep going to the pump???? the pump is very simple and almost never makes nosies just produces low fuel psi. or to much ...... almost sounds like a bad injector with a blown head gasket.... injector putting in to much fuel and then blowing the head gasket ,,y i say this is you said black smoke and fuel in the engine .... when you put in the new injectors did you have the psi of the injectors incresed from stock to match your turbo system???


this is just a gess
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