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Thread: misfire

  1. #1
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    Default misfire

    i have a 93 z28 lt1. it started idling rough and missing a little and smoking gray smoke and smells like gas but not a normal gas smell. it smells horrible. i had this car covered up behind my house and its sat up for 2 years. i started it up the other day and it ran fine. but today it started the gray gassy smokin and idling rough.

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    Default

    Only at idle? First thing I would check is the fuel pressure regulator.
    Next thing I would check would be the air filter, if its been sitting that long you could have some unwanted items in the intake air box.
    Is the gas 2 years old? Stuck injectors?
    After that the list gets really long because it could be almost anything.

    But there are some much more knowledgeable LT1 guys on here than me so maybe they will chime in.

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    Default

    E10/E15 (what 99% of stations provide now) degrades much faster than the pure-gas of old. It really only has a shelf-life of 2-3 months before it starts to go bad and gum things up. Hell, even pure gas would have long gone bad at two years. I'd start by draining the tank, flushing it, and pray that the sock on the pump isn't a mass of goo. Using new fuel, disconnect the fuel filter and toss it. Leave it disconnected. With the tank cleaned and the pump re-installed, put a fuel-hose on the open line that was connected to the filter. Turn the key to acc and have the pump push new/good fuel through the line until its free of debris. Install new filter. Disconnect fuel line at the rail, and repeat the process of flushing the line at the rail. Remove the rail and pull off all the injectors and have them cleaned out, or replace them with known good units. While the injectors are out, flush the rail with clean fuel. Change the oil. Change the plugs. Check the air filter. Crank it over and report back.

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    Default

    use the prime connector to activate the pump and drain the tank into a gas can by removing filter. otherwise you're gonna be cycling that key a million times priming to drain it

    Sent from my SAMSUNG-SM-G935A using Tapatalk
    1994 Z28 T56 - Le2 H/C, SBE, Hooker lt's, some rod ended suspension stuff, and a whole lotta tetanus
    The wrench for LTConvert's 94 Z28- Ellwein 383/LE2 H/C P600B/ CPT Pro Race/Pro Torque 3200

  5. #5
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    Default

    Quote Originally Posted by atlantadan View Post
    E10/E15 (what 99% of stations provide now) degrades much faster than the pure-gas of old. It really only has a shelf-life of 2-3 months before it starts to go bad and gum things up. Hell, even pure gas would have long gone bad at two years. I'd start by draining the tank, flushing it, and pray that the sock on the pump isn't a mass of goo. Using new fuel, disconnect the fuel filter and toss it. Leave it disconnected. With the tank cleaned and the pump re-installed, put a fuel-hose on the open line that was connected to the filter. Turn the key to acc and have the pump push new/good fuel through the line until its free of debris. Install new filter. Disconnect fuel line at the rail, and repeat the process of flushing the line at the rail. Remove the rail and pull off all the injectors and have them cleaned out, or replace them with known good units. While the injectors are out, flush the rail with clean fuel. Change the oil. Change the plugs. Check the air filter. Crank it over and report back.
    I found out today after it finally died. the optispark is shot. no fire coming from the optispark. that why all the missfiring had been going on.

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    optispark i found out today after it got worse. only firing on some of the cylinders

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    it was the optispark, was firing on just a few cylinders

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    Well no surprise there either.
    You can buy a decent unit from summit for around $150 I think. I just bought one I'll have to check.

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  10. #10
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    Default

    I got mine from O Riley cause same day no wait. Got a water pump as well. But mines a 95 and vented so no worry's.

    It's not how fast you mow. It's how you mow fast.



    1995 Trans Am - CAI - TB coolant bypass - Performance Muffler - Poly mounts - stock LT1/A4 - 13.3 1/4 - 1.9 60 foot , driven daily. .

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