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Old 05-17-2013, 01:20 PM   #1 (permalink)
81OldsDsl
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5.7 Dsl Surging (slightly and occasionally)

I have a 81 Oldsmobile Cutlass 2Dr. It has the 5.7 Diesel in it with about 57000 miles. Injection pump had to be rebuilt in 2008 because the car sat for 14 years and the seals dried out. I had another post in the wrong forum lol (6.2/6.5).

This is an intermittent does it every 7 seconds or so. Revs up just enough to be noticable (100 rpm or so). I have pulled the return line off and i am not seeing any air. I have changed the fuel filter twice with no results. Lines seem to be tight with no fuel leaks down by the block. Any other ideas?


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Old 05-17-2013, 03:36 PM   #2 (permalink)
81OldsDsl
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Additional Info: After putting the return line back on i took it for a drive. Ran great for 5 minutes or so. When the car warmed up it started doing it again.

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Old 05-18-2013, 12:12 PM   #3 (permalink)
57diesel
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These won't run correctly if the is a restriction on the return line. Wonder if maybe that is where the problem is? How about vacuum in the tank? Run it for a bit then quickly go back and remove the gas cap and see if you get any hiss?

These injection pumps run pretty much based on internal pressures so if it can't get the fuel in or out properly they don't work real well.

Have you checked for water in the fuel? Easiest way I found on these is to pull off the return line and use some sort of sucking device to pull some fuel out of the tank. I use a hand pumped brake bleeder tool. It works good cuz it puts it in a little jar so its easy to see if there is water in it. On these cars the return line is in the very bottom of the tank so that is why you can check / drain it that way. The pick up is about 2 gallons higher in the tank so their theory was the water would stay in the bottom.
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98 Burb K25 4.10's 250K miles, new to me, pretty clean and stock.
95 Burb K25 3.73's CRASHED 250K miles, looks to have been rebuilt at least once, stock, bad rust, DE exhaust w/walker muffler, 8' western plow.
81 Buick Riviera GAVE AWAY with the infamous Olds 5.7 diesel possibly still going strong.
15 VW Golf wagon, TDI. Did the buyback on my 13 Jetta TDI wagon so it was basically a trade up.
96 Burb K25 3.42's SOLD at 340K miles, told it was all original, close race between engine wearing out or body completely rust out.
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Old 05-19-2013, 11:03 AM   #4 (permalink)
81OldsDsl
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On top of the engine where the injection pump is i spotted fuel. I dried it up. Thew a paper tower undeneath and started the car. It appears that is leaking out of the pump shaft weep hole. I know that this means the seals are bad. Would this also cause a vehicle to surge or do I need to keep looking? Only 5 years and 3k miles on this pump gotta love that ULSD...
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Old 05-20-2013, 08:13 AM   #5 (permalink)
57diesel
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I'm not up in the fine detalis of the innards of the pumps so I don't know for sure what a leak there would cause for problems but if you have one internal problem / leak there could be other issues.
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98 Burb K25 4.10's 250K miles, new to me, pretty clean and stock.
95 Burb K25 3.73's CRASHED 250K miles, looks to have been rebuilt at least once, stock, bad rust, DE exhaust w/walker muffler, 8' western plow.
81 Buick Riviera GAVE AWAY with the infamous Olds 5.7 diesel possibly still going strong.
15 VW Golf wagon, TDI. Did the buyback on my 13 Jetta TDI wagon so it was basically a trade up.
96 Burb K25 3.42's SOLD at 340K miles, told it was all original, close race between engine wearing out or body completely rust out.
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