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Type: Posts; User: MrShorty

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  1. Intermittents can be very frustrating. My advice...

    Intermittents can be very frustrating. My advice at this point is to be sure to keep all your diagnostic stuff handy. Next time it won't start, put the fuel pressure gauge on it and see if the fuel...
  2. You may find this thread and its accompanying...

    You may find this thread and its accompanying link to an article describing starter diagnostics of interest. http://www.gmtruckclub.com/forum/showthread.php/141610-how-to-test-for-a-bad-starter
  3. On the 5.7's like mine, the fuel pressure...

    On the 5.7's like mine, the fuel pressure regulator (fpr) is inside the intake manifold. My impression has been that, on the 7.4, the regulator is attached to the fuel rail. According to my Hayne's...
  4. Autozone has a version of the Chilton's DIY...

    Autozone has a version of the Chilton's DIY manuals on their site if you are willing to register with them for free.

    You might check with your local public library -- many public libraries have...
  5. Does the fuel system hold pressure when the pump...

    Does the fuel system hold pressure when the pump is off? It does kind of sound like it is getting too much. Fuel injectors stuck open would allow too much fuel, and would show up as a fuel system...
  6. I don't know the legalities for emissions testing...

    I don't know the legalities for emissions testing where you are at. OBD-2 keeps track of when the codes have been cleared and sets a "Not Ready" for the I/M monitors. Around here if these indicators...
  7. Here's what I think I would do next: 1) Jack...

    Here's what I think I would do next:

    1) Jack up one front wheel. With system in 2H, this wheel should spin easily.
    2) Put system in 4H. This front wheel should be impossible to spin. I might even...
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    In doing this, can I then assume that this means...

    In doing this, can I then assume that this means we know the pump is not getting power while cranking? If we are certain that the fault is because the fuel pump is not getting power, then my next...
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    My guess is that, if we can figure out why your...

    My guess is that, if we can figure out why your fuel pressure is dropping off like this, we will figure out why it won't start. Does the fuel pump run while cranking? If not, will it start if you...
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    Some of it depends on what you are trying to do....

    Some of it depends on what you are trying to do.

    Way back when, I remember helping my dad put a full time to part time conversion kit into his NP203. This kit included front hub lockouts.

    If...
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    All of those numbers look low to me. If you cycle...

    All of those numbers look low to me. If you cycle the key on and off a few times (to "prime" the pump more), does the pressure ever get near 60 psi? If you can find the "test lead" for the fuel pump...
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    I know you said that you checked the vacuum...

    I know you said that you checked the vacuum lines, but the most common cause of a high idle like that on a fuel injected engine is some kind of vacuum/air leak. Maybe the throttle plate is not...
  13. If it is the same one I wrestled with a month ago...

    If it is the same one I wrestled with a month ago -- the one just below and to the passenger side of the distributor, that one is a challenge to get to.

    IIRC, on my '98 5.7 Suburban, it was a...
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    That sort of thing can definitely be frustrating...

    That sort of thing can definitely be frustrating (like just about anything we learn from "the school of hard knocks"). As I recall, that o-ring fits pretty snug in its sealing groove, so it will...
  15. Leaky injector, maybe??

    Leaky injector, maybe??
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    If memory serves correctly, the low pressure...

    If memory serves correctly, the low pressure cutoff switch is set for about 25 psig (40 psia). The vapor pressure of 134A is 40 psia at about 40 F, according to engineering toolbox:...
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    When I got this code on mine, I asked a mechanic...

    When I got this code on mine, I asked a mechanic friend about this, especially since at the time my Explorer (six years older) still had the original cats. He suggested that the OBD-2 post-cat...
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    P0420 points to a fault in the post-cat O2 sensor...

    P0420 points to a fault in the post-cat O2 sensor for the driver's bank. It is possible that this code points to a failing O2 sensor (and, by extension, perhaps the other three O2 sensors are also...
  19. The common coolant leaks that I know of: 1)...

    The common coolant leaks that I know of:

    1) Intake manifold. When my intake manifold was leaking, it was a slow leak at the front of the engine. I can't remember if it dripped off of the radiator...
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    how to test for a bad starter.

    Just went through this today and did find my starter was bad. While all of this was in the Haynes manuel, this guys write up on how to test the starting system was more helpful....
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    coolest? cars??

    Advertisers are always saying things to get people's attention, and the automotive marketplace in particular can be very competitive. All that said, someone advertising Toyota Scion's on the radio...
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    Is there pressure building up in the gas tank? Is...

    Is there pressure building up in the gas tank? Is the EVAP line/plumbing operating as it should?
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    IIRC, the large line is the fuel supply line (the...

    IIRC, the large line is the fuel supply line (the one where the pressure gauge attaches) and the small line is the return line. I would normally expect little to no pressure in the return line,...
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    Maybe it is a poor quality part and maybe not....

    Maybe it is a poor quality part and maybe not. This is not something I see frequently.

    Have you checked the rest of the fuel system? I would suspect that there might be some other condition (a...
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    From what little I have seen diagnosing my own...

    From what little I have seen diagnosing my own fuel system issues, these engines need 50+ psi of pressure to start/run well. Below 50 and they start to have problems. I expect once you resolve the...
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