skip , hop , and wobble gremlin,, got me puzzled..................

Discussion in 'Chevy Silverado Forum (GMC Sierra)' started by redchev4x4, Aug 9, 2013.

  1. redchev4x4

    redchev4x4 New Member

    my original post must not have went through,, but he goes.........

    2003 4x4 4.8 engine auto tranny,,, 175,000 miles,,, every so often with no pattern it start missing and skipping and when you
    slow down or stop sometimes it will go dead. this is an ongoing thing for about 4 months now.. sometimes it will go 3 or 4 weeks
    between this happening. no check engine light ,, no warning,, the onlt constant is it has to be warm or hot.. and it takes 10 to
    20 miles before it ever happens. plugs and wires have about 90,000 on them,, this will be my first replacement,,, but its really
    weird. you guys got any ideas of other things to look into? i have replaced the fuel filter,, and cleaned the air filter,, someone said
    that the MAF might be dirty,,, don't know bout that but possible...

    what ya'll think?
    red truck 1.JPG

    terry m
  2. j cat

    j cat Active Member

    well with missing I would expect p0300. anyway just get a fuel pressure gauge and start making pressure checks. if the pump is shot replace the pump relay and regulator that way this will be all done and no other issues.

    on spark plug wires measure the wire resistance they should be around 600 ohms. if this is correct your good. now if you buy new wires measure the resistance if you find the new wires are with higher resistance then bring them back they are not for your vehicle. you see low resistance wires that are the correct part cost more to manufacture. many sell these cheap wires of the wrong resistance and this messes up PCM ignition control.
  3. redchev4x4

    redchev4x4 New Member

    i priced the ac/delco wires and plugs,,, wires were about 70.00 and plugs were 5.20 each..
    i would think the ac/delco wires would be the correct resistance.
    i got my doubts about it being the pump because it has great pressure at the engine,, and it runs like a new one until this glitch hits it. i think something electrical is breaking down with heat... yesterday it did for the first time in weeks , i drove it about 35 or 40 miles,, (which is about twice as far as drive to work every day)
    after about 40 miles it just started out on the highway skipping and missing. the last time it did it i put code reader on it but it said all was good no codes to read. so i don't know.... this is looking like a hunt and peck thing now.
    but thanks for wire info i will have to check into that before dumping 70 bucks in a set of wires.

    terry m
  4. ChevyBoy2009

    ChevyBoy2009 New Member

    Could be the fuel pressure last truck was doing that also,replaced it and it was fixed
  5. j cat

    j cat Active Member

    even if you get the ac delco wires you must check for the correct resistance . sometimes these wires are defective !

    just got down to autozone and do the fuel pressure check. they should be able to help you .

    if the pump is shot get ac delco or delphi pump. do not buy airtex even if they give it to you for free.
  6. redchev4x4

    redchev4x4 New Member

    ok will do,,, i didn't know they could do a pressure check on the pump.
    kinda makes you leary about leaving the house with,,, it always straightens itself
    out after it cools for just 5 or 10 minutes,, so i don't know....................

    well out to pull headlights out of the wifes equinox to do a headlight restoration on them with the 3M kit,,, fun fun fun!!!!

    terry m
  7. RAV52202

    RAV52202 New Member

    We have a truck at work that will over heat the fuel pump relay and the truck will die. in the winter that is fine cause we pull it out and throw it in a snow bank for a minute. Just a thought. we still havent figured out what is making it do that yet. sounds similar only cause if you let it sit or change the fuel pump relay it will start right back up and it will do it when it feels like it.
  8. j cat

    j cat Active Member

    if the fuel pump relay over heats then you have a short circuit/power cable leakage. I would measure the fuel pump current. also check that the correct fuse is used. this may cause a fire.
  9. RayVoy

    RayVoy Active Member

    Relays will also overheat if the contacts are burned/corroded. The resistance of the corrosion at the contact point will cause a voltage drop and heat will form.

    The description of the intermittent problem does sound like a fuel shut off. If the pump is good, I would change the relay. The last time I bought one, it was around $10
  10. redchev4x4

    redchev4x4 New Member

    i will try the relay,, its cheap and could be it,, i am willing to try anything now, ask autozone if they could check fuel pressure,, they said no but we can rent you a tool to do it for 150.00 . then return your money when your done with it. yesterday i got a new standard air filter ,, some throttle body cleaner and some MAF cleaner,, this will be my next steps. i am leary about taking it on the interstate to much now.... seems like its worse when i run interstate sppeds for any length of time,,or it seems to bring on more often.

    thanks for the tips and ideas

    terry m
  11. j cat

    j cat Active Member

    what is normally done is you use a credit card for the use of any tool that they are to lend you. when done you return the tool and the charge is removed.
  12. redchev4x4

    redchev4x4 New Member

    yeah i know ,, but as much as i spend with those guys you would think they woould say yeah hold on a minute,, walk 10 steps outside and hook it up for 3 minutes and check it,, long time customer and spent bookoo bucks there in the past several years... kinda gripes me ,, ya know?

    terry m
  13. j cat

    j cat Active Member

    the stores in my area will help you out especially if its slow. they will even go and put wipers on/check codes/test battery. and even look at what your bitches are with the vehicle.

    could be you just ran across some lazy jerk.

    I would call first before you go down there .
  14. redchev4x4

    redchev4x4 New Member

    Well i think i finally got it (i hope),,, i finally got a weekend where i wasn't playing music somewhere and spent some time with the truck,,, this is what all i did,,, new wires, plugs, fuel regulator, cleaned the maf sensor, cleaned the throttle body, had the oil changed ,,, this past weekend i had a show to do about 100 mles away so i took a chance and drove the truck,, run like a top down there and back,, no misses or skips got good mlage with it too.... Today i was doing brakes and rotors all the way around and found a bad hub bearing assembly on the left front... (nice).... I thought it was the tires roaring since they are getting worn but it is the hub bearing,,, found one one line for 90 bucks,,, will replace on arrival. Just an update in case anyone else has had this problem.

    Terry m
  15. cr0wnguard

    cr0wnguard New Member

    I might have similar issue, I got 08 sierra but the check engine light comes on. It only starts to sput and sputter after i drive home from work when it's warm outside and i have driven about 20 miles. It never does it while driving only when i stop at a light after i get off interstate. The check engine light will flash and the truck will run rough like it wants to die but never does. then when i accelerate if im not careful it will hit 2nd gear hard then the check engine light quits flashing, after that everything runs smooth. I did change the #3 injector which was the first code it threw out.
  16. j cat

    j cat Active Member

    you can buy a fuel pressure test gauge for 35 USD at advance auto . testing before buying is how you do these repairs. its your money. then again with 90,000mi on the plugs I am quite sure they are bad. only plugs that work properly are ac delco irridiums not mess with the gap if the gap looks bad the plug is defective ..these are not designed to adjust unless your very much educated in how to do this with these type plugs and the small tip wire which is damaged with the wrong checking adjusting .
  17. redchev4x4

    redchev4x4 New Member

    i had a buddy of mine at work check my fuel pressure and it was well within specs,,, i have never really thought it was the fuel pump,,, all of the other repairs i did were over due anyway... and so far its running like a top... power seems to be back up and no misses or skips after it gets hot.... so maybe its fixed.

    thanks for the info
    terry m
  18. I am sorry to hear that you are experiencing an issue with your vehicle, cr0wnguard. I understand that you are looking for advice to resolve this issue yourself and I might not be able to give you any technical advice but I would like to assist if you find that you cannot resolve this issue yourself. Private message me if I can be of any assistance.


    Jennifer T.
    GM Customer Care
  19. redchev4x4

    redchev4x4 New Member

    well i replaced the left front bearing hub assembly yesterday,, took a little longer then i thought it would,, kind of tough to get off,,, but finally got it broke loose... installed the new one and put rotor and brakes on and noticed one of the wheel studs is not the right thread,, 5 correct ,, 1 incorrect,, WELL SPIT!!!
    so i knocked one out of the old hub and swapped it out in the new one,,, quality control ,, yeah right.
    put wheel on and torqued ,, feels good ,, sounds good,, we'll just see if it last,,, got my doubts,, nothing made to last any more,, i got 170,000 out of the first one,,, doubt the new will last 50,000.

    terry m

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