Question about 2000 GMC Jimmy

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On my 2000 gmc jimmy if i start it every morning around 9 then in the evening around 5 no problem but if i miss either one or its later it is hard hard to startany ideas

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First thing I would do is to put an OBDII reader on it and see if any codes are being stored in the ECU. Just because the engine light isn't on, doesn't mean it's not throwing out codes.
Some other things to take into account is when the last tune up was done on the vehicle. If the plugs are original they may be ready to be changed, Your igniters (Coil Packs) may be throwing weak spark. If you have over 100K on the truck, you're fuel pump may be getting weak or at the very least the fuel filter may be getting clogged. Just some things to think about, but definitely pull the codes, if there are any it will lead you in the right direction of either an electrical problem or a fuel problem.

Posted on Dec 13, 2014

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Something here doesn't make sense. If it is longer than 9 - 5, it won't start easily. Yet from 5 til 9 the next day, it has no problem? Can you give a little more specific detail?

Posted on Dec 10, 2014

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Are you saying that the starter motor turns the engine over properly but will not start if truck sits for a period of time; But will start if that amount of time is less? If such is the case there is a common fault that may be the reason;The wiring to the coil and/or chassis/engine...The pink wire from the coil to the under-hood fuse block on connector C2-Pin B-10 may be corroded or loose...with an ohmmeter set on lowest scale measure continuity between the mentioned points...Must read close to zero ohms...Then measure from the negative battery post to bare metal on engine block and fender...both must read zero ohms...If you read high (2000 ohms) on any of these three points tell me and I'll take it from there...This may not be your fault but it needs to be eliminated up front...saailer

Posted on Dec 08, 2014

Testimonial: "i give it a good tune up and that seems to have fixed it.i believe everything was still factory.dad said he never had it done.so lasted a long time"

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Change the battery robert or check your battery.Then run your vehicle atleast 12kms daily.Service the vehicle in authorised service station- by Indian

Posted on Dec 08, 2014

  • robert looney
    robert looney Dec 08, 2014

    put a new battery in it seems to me it is in the fuel maybe leaking out of tb don't know how to check

  • robert looney
    robert looney Dec 08, 2014

    could it be in the dist.cap or rotor button,plugs or plug wires

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1 Answer

I have a 2000 GMC Jimmy and the Vacuum Line came off and I was wanting to know where to hook it back up???


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The oil presure switch does have some bearing on the problem but my suggestion is to change the coil. I had a the same problem with an astro van. I changed everything that you have described and it fixed the problem just for a little while and then all of a sudden did it again. I changed the coild and the cold start swithch and never had the problem again.

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a tune up would be the first step; plugs wires and fuel filter. then try a new rotor cap and button. if there still is a problem then check and see what you are getting for fuel pressure.

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