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  1. #1

    Default 99 suburban problem

    Hello Ladies and Gents....

    Having a big problem with my 99 chevy suburban....

    Ok here is the symtom... (forgive me I'm not much of a mechanic)

    Startingg...... (turns over just fine) however.... if the vehicle has sat for more than 10 hours (it starts right up... drive on... but iff the vehicle has been ran and then shut down and you try again to start it in say anywhere from 20mins to 8 hours... you have to crank and crank , again it turns over ... just won't fire).... obviously with the way this goes the closer you get to the 10 hour park the less you have to crank it.

    99 chevy suburban 2500...

    Thanks to all that can lend a hand

  2. #2
    Legend

    Join Date
    Feb 2008
    Location
    Red Wing, Minnesota, United States
    Posts
    3,386

    Default

    454? 4WD? check engine light on?
    99 K1500 Suburban LT "THE BEAST"
    Hypertech III, K&N, true dual
    285/75/16
    ___________________________
    Jason

  3. #3

    Default

    appolgoies ...

    yes 454 and 4wd....

    no check engine light is not on...

  4. #4
    Legend

    Join Date
    Feb 2008
    Location
    Red Wing, Minnesota, United States
    Posts
    3,386

    Default

    Where do you live, what is the weather like while you have been having this problem? sub-zero temps?

  5. #5

    Default

    My first thought on hard warm starts is a fuel pressure regulator (FPR) problem. I see it all the time in the early Explorers, and, since your 454 uses a very similar fuel system, I might suspect the same problem. What happens is the diaphragm in the FPR develops a leak. After running the engine, the excess pressure in the system bleeds through the diaphragm into the intake/vacuum system -- effectively flooding the engine, which makes it hard to start until that excess fuel has dissipated.

    Easy enough to check. From what I understand, the FPR on your 454 is outside the intake (unlike my 350) and has a vacuum line attached to it. Next time you run the engine, simply pull that vacuum line off of the FPR and see if there's gas in that vacuum line. If there is, you need a new FPR.

    If that doesn't yield anything interesting, the next thing I might do would be to put a fuel pressure gauge on it and see what fuel delivery is doing differently on warm start vs. cold start.
    '98 K1500 Suburban LS 5.7 L 4L60E NV246 ARB
    '92 Ford Explorer XLT 4x4 4.0 L A4LD BW13-54 Trac-loc rear
    "My toys were the greasy cogs and springs and pistons that lay around all over the place, and these, I can promise you, were far more fun to play with than most of the plastic rubbish children are given nowadays." Danny in Roald Dahl's Danny The Champion of the World

  6. #6

    Default

    Well I appriciate the idea... come to think about it... I forgot to mention that after the cranking start I can smell an odor of gas occationally... ... I'm gonna go check this out now...


    thanks again... I'll post results here...

  7. #7

    Default

    ok I just took a look for the fuel pressure regulator ... and didn't dig in too far and noticed an odor of gasoline coming from the air filter... Opened it up and it was.... detently damp on the air intak hose from the air filter..... I would assume this is not good.. ... however I was unable to locate the fuel pressure regulator after trying to trace a few of the vacume lines... any ideas?

  8. #8

    Default

    I have no idea where GM put the regulator on the 454. I know where to find it on my 350, but not on the big block. If I were trying to find it, I might start by locating the fuel lines underneath -- identify the return line (the one without the filter) -- then follow that back up to the regulator.

    Anyone here with a 454 help him find the regulator?

  9. #9

    Default

    I have been told it's located behind the distributer.... which is a bad spot to get to...

  10. #10

    Default

    I am having the same problem with my 99 2500 4x4 with 7.4l. rwslippey, Have you figured out if it was the regulator or not? It looks like you will have to pull the upper plenum to get to the reg. I figured when I do mine, I will check the injectors, replace dist cap and rotor etc, and replace the regulator diapham. I love my SUB but this prob is making me . Hope you get it repaired....let me know what you find. Thanks...

    Jess

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