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  1. #1

    Default 98 Silverado 5.7 - Won't start when wet

    Hi All!

    Weird problem that makes me want rethink keeping this truck.
    Truck is great to start when the weather's dry (hot or cold), but once or twice a year it just won't start after maybe sitting a day in damp weather. It never did it when the weather's dry.

    I've put 3 new dist caps and 2 sets of wires on it in the last year. I've also put a coil on it and have WD-40'd everything...still not start. It will sputter a couple of times, and black smoke will beltch out a couple of times, but no start. Has a new fuel pump also.

    I'm trying to remember what I did, to get it going last time, but I think it sat & dried-out, then started on it's own.

    There's something that must be inherently faulty on these things that leaks water in. Hoping someone else out there has soem experience with the same problem...makes me second think the reliability of this truck as it does it without any warning (other than the weather forcast..even then, not every time)

  2. #2
    Master Mechanic Silverado Junkie's Avatar
    Join Date
    Feb 2010
    Lead Hill, Arkansas


    Id have it scanned and see if any codes come up.
    1995 Silverado,Z71, 3-inch lift,2-inch leveling kit, SkyJacker Suspension, short ram-air intake, throttle body spacer, MSD ignition coil, straight pipes

  3. #3


    Is there any sparks? I am assuming there is if it spitting and sputtering...

    Try spraying a little ether into the TBI, and then start it.

    Wondering if the timing is a bit off...

    Wouldn't hurt to check the Distributer Cap for cracks, or burnt contacts.
    Pavement sucks... :grrrrrr:

    1994 K1500 4x4 Ext. Cab
    PCM chip and Xenon 8000k bulbs bored over .050"
    balanced Crank, 10:1 compression
    Flat top pistons,cam,ported heads
    Option Racing Cold Air Intake
    Holley Throttle Body Spacer
    Accell Igition, 45kv coil
    FloTech Headers, no CATs, dual exhuast
    Goodyear Silent Armor A/T 305/70-16
    Pioneer SupertunerIII CD USB Bluetooth
    Kicker ZX200.2 ZX Amp
    Kicker Audio COMP 10" Subwoofer

  4. #4


    Weather was sunny here most of the day, still kinda cold, but things dried up quite a bit. Got home from work, and tried it again...fired right up. I don't know, same as last time...

    I'm going to replace th ecoil again and seal the cap to the distributor base with either a heavy grease or a light coat of silicone and wait for spring!


  5. #5
    Jr. Mechanic Prophet1990's Avatar
    Join Date
    Dec 2009
    Waueksha, Wisconsin

    Default seafoam!

    dump some sea foam in ur gas (takes out the water in it), buddy dumped a bottle down his carb and thing bogged blew smoke then was perfect. just an idea, he didnt really care for his truck TO much but
    2000 Chevy Silverado 1500 Z71 323 5.3L V8
    -K&N 57 Series Generation II - Cold Air Intake
    -JVC Deck - KD-HDR50

    -New Transmission
    -New Rear End
    -New Alternator, Battery and Starter
    -Key-less Entry (Thanks aboston)
    -Bed Liner w/mat

    Blue Xenon Headlight
    Bulbs (High/Low)

    Other Toys
    -2008 Buell 1125R
    -2003 Mustang GT Premium (500horse)
    -2010 Polaris 800 IQ

    Looking for a 1990 454 SS 1500 to buy

  6. #6


    I'm going to replace th ecoil again and seal the cap to the distributor base with either a heavy grease or a light coat of silicone and wait for spring!
    before you go spending money spray some water on it like it would be raining. pop the hood and see if you have water leaking on the distributor (bad cowl seal)

    05 silverado shortbed

  7. #7

    Default wet weather issue

    Ok you may think I'm nuts but here is what I did, had the same issue with a 89 cutlass. Dry day I opened the hood and had the hose on fine mist and started the car. Started to spray and when I hit the wires with some h2o the sparks flew and the rough idle started so it was a wire change as the insulation had degraded pretty bad but they looked fine.
    call me nuts but it worked....

    OK so I stopped reading at the seafoam reply and now see I'm not the only one that sprays water...
    Last edited by jake's silverado; 03-03-2010 at 04:09 PM.

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