Question about Chevrolet Silverado 1500

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I have a 1997 chevrolet K1500 5.0 automatic. My guages are reading strange, first oil pressure twitches between normal and like 80 psi. sometimes reads normal than randomly 80 and at some point back to normal again. engine temp moves up a couple degrees never makes it to normal but blows hot air. finaly my bigest problem bing there is no gear indicator light. thought it may be the cluster but replacing it did nothing.

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  • stevensinatr Mar 29, 2011

    Ok, so basically there are a few different problems I should check into instead of assuming its only one simple problem such as the cluster. But like I said before my biggest problem is that I never know what gear I'm in. no LEDs light up when I put in gear or park etc. I have looked at lots of forums trying to find something similar to my situation but haven't. The most I found was to check the neutral safety switch on the trans but that also stated that the truck wouldn't want to start if it were bad. Chevrolet parts also said that's something that "could be a problem." I haven't been able to check the parts in the steering column. I was thinking maybe that's where the truck reads what gear it's in.

    Ok, so basically there are a few different problems I should check into instead of assuming its only one simple problem such as the cluster. But like I said before my biggest problem is that I never know what gear I'm in. no LEDs light up when I put in gear or park etc. I have looked at lots of forums trying to find something similar to my situation but haven't. The most I found was to check the neutral safety switch on the trans but that also stated that the truck wouldn't want to start if it were bad. Chevrolet parts also said that's something that "could be a problem." I haven't been able to check the parts in the steering column. I was thinking maybe that's where the truck reads what gear it's in.

  • stevensinatr Mar 29, 2011

    it was a new one i installed, still no LES lit up

  • stevensinatr Mar 29, 2011

    Your 100% on the money! Replaced park / neutral safety switch and my gear light came back on! Replaced the oil pressure sending unit, and my pressure returned to normal. Next ill do a thermostat and coolant flush, but the main problem has been solved. Thank you so much!
    PS. These are very simple to install your self. It took me about 30 minutes to do both. This has been well worth the time and money! B)

  • stevensinatr Mar 29, 2011

    YES! I love it!

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The oil pressure fluctuation of the gauge is a very common problem in the Chevy trucks, it is caused by a defective oil pressure sending unit, I've see the question allot and fixed many ion the shop for this problem. There are numerous bulletins on the problem issued by GM on the problem. The sending unit is placed at the back of the engine just behind the intake manifold on the top of the block near the distributor, you will need a special tool to remove it, any part store has the Oil pressure sending unit socket you need. As far as the temperature gauge goes, what you describing would not be considered a problem by me if it came into the shop, large fluctuations are a problem. If you are concerned this is a problem in the making I suggest you drain the coolant out and replace the thermostat, the thermostat is located in the housing that the upper radiator hose attaches to on the engine, refill the system with GM DEXCOOL or its generic equivalent, make sure you get the air out of system and refill recovery tank after the engine cools down.

Posted on Mar 28, 2011

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  • yadayada
    yadayada Mar 29, 2011

    The gear position problem is another totally separate issue, the LED driver circuit fails, to repair this you will need to send the entire cluster out for a rebuilt, cost is about $160.00 at most sites. You are saying you installed a brand new cluster or a factory remanufactured one?

  • yadayada
    yadayada Mar 29, 2011

    Hello again

    I have done more research on the gear display not lighting up, this problem it seems can be caused by the Transmission Range sensor switch having corroded contacts or the switch is defective internally from poor contacts. This switch is also known as the Neutral Safety switch. I suggest you pull the connectors (2) off the switch and check for evidence of corrosion, this would be white or green colored residue on the male and female pins of the switch, clean it it with contact cleaner and then blow the excess out with compressed air. If this doesn't clear the problem, and you have indeed already replaced the display for the gear position on the dash then the switch itself may be bad. Below is the price and part number of the switch from www.rockauto.com If you do replace the switch adjust the new switch to the same bolt marks as the old one..

    STANDARD MOTOR PRODUCTS Part # NS85 [Neutral Safety Switch]

    $32.79 USD



    http://www.rockauto.com/catalog/moreinfo...', '4625', 'toolbar=yes,location=yes,directories=yes,status=yes,menubar=yes,scrollbars=yes,resizable=yes')">

  • yadayada
    yadayada Mar 29, 2011

    Ok then the problem may be with the switch or the connectors to it.

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