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Thread: please help 6.5 surging problem

  1. #1
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    Default please help 6.5 surging problem

    I have a 95 k2500 6.5 turbo vin f. And since I have owned the truck I have had a skipping/surging problem on heavy acceleration and up hill. And list of mods to the truck are as followed: full four inch exhaust and three inch downpipe. Remote pmd. Cold air intake. Turbo master with illimination belt. And full gauges. What I have replaced is: boost solenoid. Map sensor. Fuel tank sending unit and lines. New lift pump. New ops sensor. New fuel filter. And after replacing fuel system had no serging. For a couple of days and now its back. The truck has 130k and at 110k injection pump was replaced by previous owner and when serging truck does not smoke or lose boost pressure.

  2. #2
    Registered User bison's Avatar
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    Mebby air in the fuel system,wont show up on the gauge.
    Do the clear IP return tube test
    How much vac in the tank?...(leave the fill cap loose)
    98 GMC 2500 HD 6.5 F auto ext 4x4 engine rebuild at 268.000 km,Provent Oil seperator,Vacpump deleted,TM,all gauges,5th wheel.currently at 307.000 km
    95 GMC 2500 6.5 F auto ext sh bx 4x4 ,relocated PMD,OPS,extra glow and aux LP manual switch.In cab fuel gauge.CDR vented at 307.000 km to the atmosfeer.presently 405.000 km
    Wife's d dr.Soon to have pyro,boost,chip and TM
    89 GMC 2500 6.2 auto ext 4x4 relocated OPS 700.000+ KM denoted to ranch duty.
    95 chevy 2500 6.5 F st ext .parts truck .
    2 spare 6.5 F blocks,
    1 is a powerup project, the only 506 block in existence with no outer main cap bolt holes.

  3. #3
    Registered User buddy's Avatar
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    Surging could be from fuel supply, but the PMD is a likely suspect. Have you tried another PMD, is yours remote mounted on a heatsink or still on the IP?

    And by surging, how much is the RPMs going up or down?

    Other issues could be air like Bison said. Or clogged sock in the tank or clogged last ditch screen under the fuel filter. Need to check fuel pressure at the IP, and for air like Bison mentioned.

    Torque converter lockup could also be the issue if its only on acceleration or load. What gearing and tire size do you have?
    94 6.5TD C1500 ECLB w/ 50 gallon aux tank/box; 235/75R17 tires on Alloy wheels; 3.42 gears; A-Team Turbo; 4" Aero Turbine 4040 muffler to 5" Aero Turbine 5050XL muffler to 6" tip before rear axle; FSD heatsink, marine injectors; "F" intake; SynBlend 10W-30 oil; Walbro FRB-5 w/ 12 micron prefilter; Feed The Beast; WMI and Propane fumigation; OPS extension & relay; 110K original miles; Engh GMTDScanTech
    Near Future: Battery relocation, Amsoil Nanofilter behind headlight, and stereo upgrades
    Veterans of America Club, member #18

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    Default surging problem

    Yeah I a brand new sock and sending unit in tank, pmd is brand new and is on heatsink behind grills. Tire size is lt 285/75/16 and not sure bout gears.

  5. #5
    LeroyDiesel.com Burning oil's Avatar
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    Sounds like fuel delivery. Blow out the lines. Remove lines to LP and tank cap, blow from line toward tank to clear the sock off. On mine I could only get to 30mph turns out the line from LP to FFM was cloged, so disconnect rubber hose at back of FFM and blow down to LP into a bucket. I was shocked at the amount of crap mine had.

    This was a clean bucket to start with!
    Junk in fuel line. 1996 black truck 001.jpg
    Leroy.
    www.leroydiesel.com <<< CLICK
    We sell pmd extension cables and the FS PMD or the new Stanadyne PMD with available 7 year warranty.Turbo Boost Bolts and lots of 6.5 turbo diesel parts. Check out the web site.
    Be sure to update your signature with products you bought from me.
    1 ton, crew cab, 6.5 diesel w/DB2 4911 IP. srw.
    1994 2wd Suburban.
    I like it alot. https://www.youtube.com/watch?v=NH9t44iOiA4

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    Default still surging

    I have a new sending unit with new sock on it and all new lines to lift pump and have new lp and ops as well. Today I took fuel filter housing apart and cleaned very well and put new filter in and started truck and let idle for about 20 min then drove and was better but still there. I opened t handle valve and got solid fuel and top of filter had good pressure

  7. #7
    LeroyDiesel.com Burning oil's Avatar
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    Line from LP to FFM?
    Leroy.
    www.leroydiesel.com <<< CLICK
    We sell pmd extension cables and the FS PMD or the new Stanadyne PMD with available 7 year warranty.Turbo Boost Bolts and lots of 6.5 turbo diesel parts. Check out the web site.
    Be sure to update your signature with products you bought from me.
    1 ton, crew cab, 6.5 diesel w/DB2 4911 IP. srw.
    1994 2wd Suburban.
    I like it alot. https://www.youtube.com/watch?v=NH9t44iOiA4

  8. #8
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    Wat is the ffm?

  9. #9
    Registered User bison's Avatar
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    That is the fuel filter manager assembly
    The hose there is sublect to detoriation and loose hose clamps at the filter and at the steel line from the LP
    98 GMC 2500 HD 6.5 F auto ext 4x4 engine rebuild at 268.000 km,Provent Oil seperator,Vacpump deleted,TM,all gauges,5th wheel.currently at 307.000 km
    95 GMC 2500 6.5 F auto ext sh bx 4x4 ,relocated PMD,OPS,extra glow and aux LP manual switch.In cab fuel gauge.CDR vented at 307.000 km to the atmosfeer.presently 405.000 km
    Wife's d dr.Soon to have pyro,boost,chip and TM
    89 GMC 2500 6.2 auto ext 4x4 relocated OPS 700.000+ KM denoted to ranch duty.
    95 chevy 2500 6.5 F st ext .parts truck .
    2 spare 6.5 F blocks,
    1 is a powerup project, the only 506 block in existence with no outer main cap bolt holes.

  10. #10
    Well it hits on 7 of 8... WarWagon's Avatar
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    Any codes in the computer?
    How does the trans oil look?
    How many miles on the injectors?

    Borrow or buy a pressure gauge - flow does not mean pressure and your lift pump could be weak or intermittently cutting out. Test pressure at the water drain. Test while the problem is happening would be a great help.
    You have drained some fuel to look for water?

    X2 on Bison's suggestion of air. I'll expand the how too for you: You need to swap in a clear 1/4" tube from the Injection Pump to the fuel return pipe, top front of engine. look for air bubbles with the engine running and a bright flash light. Shut off engine and look for bubbles in the line floating to the top.

    Surging can be engine or transmission.
    Not enough room in sig for all the stuff I have that LeroyDiesel.com sells.

    2003 Dodge Ram 3500 SLT QC LB HO Cummins 6 speed handshaker w/ Pacbrake. Factory 3rd pedal anti theft.

    1993 Chevy "Patch" K2500 6.5 Diesel LB project beater... Now a 6.2 re-power w/6.5 NA heads. Gapless rings. Walbro FRB-5. A-Team Turbo. ARP head studs. 6 banger Trans tune chip I think I have changed, replaced, or tightened every bolt and nut on this thing!

  11. #11
    LeroyDiesel.com Burning oil's Avatar
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    Quote Originally Posted by tyler95 k2500 View Post
    Wat is the ffm?
    The pic i posted was junk from FFM to LP outlet line only. I put a hose over the line and into the bucket.
    I posted in your blog to check the LP pressure too.
    Leroy.
    www.leroydiesel.com <<< CLICK
    We sell pmd extension cables and the FS PMD or the new Stanadyne PMD with available 7 year warranty.Turbo Boost Bolts and lots of 6.5 turbo diesel parts. Check out the web site.
    Be sure to update your signature with products you bought from me.
    1 ton, crew cab, 6.5 diesel w/DB2 4911 IP. srw.
    1994 2wd Suburban.
    I like it alot. https://www.youtube.com/watch?v=NH9t44iOiA4

  12. #12
    Yup, thats a 6.5 towin a 7.3 MrBeast's Avatar
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    if your truck is an early 95 it may still have fuseable links. If it does remove and replace them with maxi fuses. The fuseable links can go bad over time and wind up working intermitently or they can not pass enough electricity causing things not to work right. I had this issue on my 94.

    Also, you have no garuntee the PO put in a good pump, I have had an IP last less than 5000 miles. I put 3 of them in my truck last year. Mine is a 94 vin code F.

    If memory serves the newer style trucks also have fusable links in the fuse box, they are a fuse that appears to be made out of stainless or aluminum. They can go bad as well causing issues, try replacing them with fuses.

    It would also be a good idea to check your fuses for corrosion and if any of them are the cheap chinese fuses throw them out and get good quality ones. I have seen the metalurgy in chinese fuses so bad they would hardly conduct electricity.

  13. #13
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    Default still having problems

    Where about would these fuseable links be located on the truck exactly and what do they do and look like? The injectors have 130k on them they are stock still

  14. #14
    Recruit JMJNet's Avatar
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    Are you using DTech aka Flight System PMD?

    Another possibility is the Optical Sensor Filter harness? This usually cause a code.
    #####---------######-------#####
    1995 6.5TD GMC Suburban
    PMD in Bumper
    4" Warpspeed Exhaust
    KD LP/OPS Harness
    Bosch Duraterm GP
    Heath Turbo-Master
    Chevron's XLP Diesel Additive

  15. #15
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    I bought a grey pmd with heat sink. Is says standyne on it. Is optical filter harness a myth or can that cause a problem. Awhile ago I did have codes 34 and 35 and 78 I believe I read them correct but havnt had no check engine since then. I just checked codes again and got 12

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