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  1. #1
    Sr. Mechanic DirtDog's Avatar
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    Default A friend in need...

    Ok, my brother has a 1997 Chevy K1500 Silverado with a 350 TBI engine and auto trans. When driving along at highway speeds, the engine sputters and basicly runs like crap. If you floor it, it straightens out somewhat, bit it still sputters just a bit. The SES light also comes on and flashes steday for a few seconds, then goes out. it repeats this constantly. He already has installed new plugs and wires, and his air filter and fuel filter are good. What could be causing this? I'm thinking maybe the throttle position sensor or maybe an oxegen sensor. Any input on this would be greatly appreciated.

    Thanks
    Jack.
    2007 Chevrolet Silverado 1500 Classic.
    1993 Dodge Stealth 3.0L V6 - SOLD
    Live to ride, Ride to live.
    It is what it is, -N- STUFF!!!

  2. #2
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    dwill3015's Avatar
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    Default

    Could be a plugged catalytic converter.
    Darcy
    Washington State
    2006 Silverado 2500HD LT3 4X4 CC SB Duramax LBZ
    Tuff Country 6" lift, 35" Toyo M/T's on 20" Ultra Peacemaker wheels, Quadzilla Stealth2 programmer, Diamond Eye 5" cat-back exhaust, factory Special order color Yellow.

  3. #3
    Sr. Mechanic DirtDog's Avatar
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    Default

    Yeah, that could be a possibilty. I had not thought of that one. Thanks.

    But would a plugged cat make the SES light come on and flash like that???

    Jack.

  4. #4
    Legend bry2500's Avatar
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    Default

    It can. did it on my 96 Monte carlo. Take the truck for a good rip up the highway and right after some decent speeds pullover and check the cat. I will be unusually hot and have a bad smell.Sometimes like rotten eggs. These are tell tale signs.
    BRYAN

    "IF YOU DON'T TREAT IT LIKE A TRUCK IT'S JUST A REALLY BIG CAR"

    02' Avalanche 2500 Onyx Black
    8.1L Vortec
    43,000 miles

  5. #5

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    Check the codes in the computer, it's trying to tell you something.
    Gary

    99 K 1500 Suburban
    78 Silverado Big 10 w/factory 454
    00 S-10 Blazer
    1976 Trans Am
    1980 Honda CB900 Custom

  6. #6
    Sr. Mechanic DirtDog's Avatar
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    Default

    Quote Originally Posted by GaryL View Post
    Check the codes in the computer, it's trying to tell you something.
    Thanks, I would do that but I don't have a scan tool.

    Thanks for all the help so far. I'll tell him to check out the cat.

    Jack.

  7. #7

    Default

    Quote Originally Posted by DirtDog View Post
    Thanks, I would do that but I don't have a scan tool.
    I expect I'll get some negative karma by saying this, but, IMO, if you are going to DIY diagnosis on these vehicles, you've got to figure out how you are going to get access to a scan tool. I don't have one is just an excuse. Sometimes parts stores like Autozone will pull codes for free in hopes of selling parts. I've seen a few shops willing to pull codes for free in hopes of selling diagnostic/repair services. A bottom of the line OBD-2 code reader can be purchased for $US 50-100, a bottom of the line scanner like I've got goes for $US 150-200, and on up from there, depending on how much functionality you purchase. "Guessing" at what might be causing the SES light to come on and flash is not a diagnostic procedure.

    [off soapbox] That said, a flashing SES light like that means that the problem the PCM is seeing is one that it believes can lead to significant/expensive engine damage if not taken care of soon. O2 sensor/TPS/Cat codes usually don't fall into this category. Most of the time when people have reported a flashing SES, it seems to be a misfire code. Whatever the problem is, the best first step is to figure some way to get a code reader on it and find out what the computer has to report.
    '98 K1500 Suburban LS 5.7 L 4L60E NV246 ARB
    '92 Ford Explorer XLT 4x4 4.0 L A4LD BW13-54 Trac-loc rear
    "My toys were the greasy cogs and springs and pistons that lay around all over the place, and these, I can promise you, were far more fun to play with than most of the plastic rubbish children are given nowadays." Danny in Roald Dahl's Danny The Champion of the World

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