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Thread: '68 Camaro - 502 with Holley Sniper quit running.

  1. #1

    Question '68 Camaro - 502 with Holley Sniper quit running.

    Hi from Yuma AZ. I have a 1968 Camaro with a 502, Holley Sniper, MSD Digital 6A Ignition, Bosch 17025 WBO2 sensor, HEI Distributor. The car was running fine and I went to start it the other morning and it ran about 5 minutes and died. It would not start again. It did once backfire through the intake. I've checked the MSD, plugs & wires, fuel pressure. I noticed on some datalogs that the AFR was jumping around and going over 30. I do not have any exhaust leaks at all. I also noticed that sometimes the WBO2 sensor was heating, but other time it was not. I have attached a datalog and Config File, so if anyone could give it a look and maybe some input I'd be truly grateful. Thanks.
    DataConfig.zip

  2. #2
    Join Date
    May 2019
    Location
    Ct
    Posts
    101

    Default

    Could the distributor have spun a little, throwing the timing off?

  3. #3

    Default

    The distributor is tight, can't even budge it. The car has started a few times since the initial problem, but runs only 1 to 3 minutes and the dies like it's flooding out with fuel. After it dies, I looked into the Sniper and the intake manifold has some fuel puddled up in it, not a lot but enough that you can see it.

  4. #4
    Join Date
    May 2019
    Location
    Ct
    Posts
    101

    Default

    Have someone toggle the key so you can look down and see if an injector is stuck open.

  5. #5

    Default

    Checked and no, there's no injector stuck open.

  6. #6

    Default

    Build a new tune using the Wizard. Only takes a minute and it sometime solves weird problems. If that doesn't solve it, then take some datalogs and study them for clues.

  7. #7

    Default

    I did reflash the ECU and used the Wizard and it still has the same problem. I have a new Bosch 17025 WBO2 sensor coming in on Wednesday, so I hope that corrects it.

  8. #8

    Default

    Well, I found the problem. It was a weak coil. Installed an MSD HEI coil and it started running good as new. I learned if there's a problem maybe I shouldn't assume it's the Sniper from the start. Oh well, live & learn.

  9. #9

    Default

    No sweat. I thought mine got all jacked up, and it turns out I had a plug boot melt on the header and it caused a misfire (face palm). And sweet ride! I have a '68 with a bored 454.

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