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Old 12-28-2015, 12:55 PM   #1 (permalink)
hawks
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6.2 Weird Issue

First off let me say, I know NOTHING about a diesel !! and I am new to this site & signed up to try to figure out issue I am having with a dump truck I recently purchased. I knew it had issues before i got it but I got a good deal in it so.... main issue is....

The truck will crank up & idle great!! Idle ALL DAY Long if needed... BUt Once you rev up the engine ANY...it dies!!! ....cranks & idles back easily! try to rev it up and keep it running & you can BUT, it acts like it's not taking fuel right.. it takes a few seconds to accelerate then it acts like it revs up high (maybe like a delayed reaction?). if needed I can get a video showing what it's doing (if that would help)

I have been looking on this site to try to find something that matches what I am experiencing (and will still continue to) but so far I haven't came across anything

I have changed the fuel filter thinking that might help it
Could it be the IP ?

Any advise ,thoughts,etc?

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Old 12-28-2015, 01:10 PM   #2 (permalink)
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Is there any smoke when you try to rev? Install a clear line on the return on the IP to the steel return line on the front of the motor.

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Old 12-28-2015, 06:50 PM   #3 (permalink)
Bones200
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Still have mechanical fuel pump? Oil smell like diesel? Sounds like fuel delivery issue. I think it has 2 fuel filters. You stated changing one.
Like jdf915 said. Does it smoke when you give it fuel?
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Old 12-28-2015, 07:55 PM   #4 (permalink)
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A 87 SHOULD have the square box filter. Have you checked your filter and bleed valves (while it's running)? The top one is fuel and bottom is water. If you have the equipment you should check your fuel pump located at the front/bottom/passenger side of the engine. A electric pump (added after market by a PO) should be located near the fuel tank inside the frame rails with a filter befor it, check that filter if there.
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Old 12-28-2015, 08:27 PM   #5 (permalink)
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If you do have the model 80 filter setup, take out this bleeder, crank it over...
Fuel should shoot out and hit the hood.... good test to tell if lift pump is working.

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Old 12-28-2015, 08:46 PM   #6 (permalink)
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If you do have the model 80 filter setup, take out this bleeder, crank it over...
Fuel should shoot out and hit the hood.... good test to tell if lift pump is working.

You wish this was your engine bay
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Old 12-28-2015, 08:52 PM   #7 (permalink)
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You only have one filter stanadyne model 80 box. You are surely getting air. Did you just buy the truck or this problem quickly come about? Im saying Dont buy an injection pump. You will need to troubleshoot this problem. Start with 1/4 id clear line off the ip return. There is probably a black hose there now its about 4" long and easy to replace. This will show air. I would put a fp gauge on it for testing. Monitor the pressure at idle and while revving if it quickly falls flat when sputtering and surging then you likely have a restriction or bad pump.
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my guess would be shocks
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Even the guys who own them aren't 5.7 guys.
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Old 12-28-2015, 08:52 PM   #8 (permalink)
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Originally Posted by JCDiesel View Post
You wish this was your engine bay
Mine looked better than that....

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Quote:
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What your saying happened, should never be able to happen.
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I put a chevrolet tailgate on my last truck and it started acting like a girl...love me, need me, want me pay attention to me. Took it off and put the GMC back on (fixed the latch) and it went back to being the same old dirty bastard it used to be
~ Bob
1987 K20 5.7 TBI 700r4 np208
1990 C1500 5.7 700r4 Short stepside
1999 Chevrolet K2500 5.7L Auto
2006 Jetta TDI 5sp

Do yourself a favor and read the 6.2 Diesel Student Training Manual ... lots of good info...it's in PDF format located here >> PDF Manuals
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Old 12-28-2015, 10:34 PM   #9 (permalink)
smackzed
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Could also be a sticking metering valve. Replace the return line with clear for sure...best cheapest engine troubleshooting tool there is...but IF you don;t see any bubbles, add a pile of good fuel additive, low ash 2 Stroke oil, or Powerservice, or Howes, add a quart and then let it idle for 20 mins. After it's idled a while see if you can take it for a romp, hard throttle followed by letting off followed by hard throttle etc..The point is to get the metering valve moving, lubed, and get any built up gunk rubbed off and burned.

This is likely not a major problem
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Old 12-28-2015, 10:49 PM   #10 (permalink)
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Quote:
Originally Posted by smackzed View Post
Could also be a sticking metering valve. Replace the return line with clear for sure...best cheapest engine troubleshooting tool there is...but IF you don;t see any bubbles, add a pile of good fuel additive, low ash 2 Stroke oil, or Powerservice, or Howes, add a quart and then let it idle for 20 mins. After it's idled a while see if you can take it for a romp, hard throttle followed by letting off followed by hard throttle etc..The point is to get the metering valve moving, lubed, and get any built up gunk rubbed off and burned.

This is likely not a major problem

I don't think its an air issue, it restarts too easy and idles good, but check anyway. I'm more in line with what Sean is suggesting here.

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well to make your pump retarded, you could let it hang out with me for a day
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