Detroit 60 12.7 cyl3 misfire

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Bias_racing, Apr 11, 2021.

  1. Bias_racing

    Bias_racing Light Load Member

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    Drove to look at a truck I'm considering buying. Guy told me it has a cyl 3 mis and thinks its an injector. He has an extra one. Take that with a grain of salt. Temp on cyl 3 is lower.

    Is there anything I can do to make sure its not anything major? Injector or doing an overhead adj is cool id really not rather deal with a dropped valve or bad cylinder or something.

    It starts right up, doesnt smoke. He says no oil water or diesel mixing. I suppose id have to sit and let it run for quite a while to see evidence.

    Scanner I can buy, taking the intake manifold off, maybe a scope? What can I do?
     
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  3. Rideandrepair

    Rideandrepair Road Train Member

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    I would want a pressure test on the coolant system. Get a loaner from Auto zone. Pump it up to about 15-20 lbs. check if it holds pressure. Then set it at about 5 lbs. start Truck, see if pressure builds. If there’s a problem like bad head gasket, possible dropped liner, you’ll know right away. Injectors are about $2000 for a six pack. Not hard to do. Labor maybe $1000? I’m not sure. New harness and valve cover gasket, maybe another $300. Good Luck with the deal.
     
  4. Bias_racing

    Bias_racing Light Load Member

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    Thank you. Trucks a 91 i suppose I can grab a scanner?

    Any mechanics in the mo area?
     
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  5. BoxCarKidd

    BoxCarKidd Road Train Member

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    Sketchy deal in my opinion. If you were looking to sell a truck would you have it running right and look for top dollar?
    I would plan on in frame if I bought it and build that into the purchase price.
     
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  6. Bias_racing

    Bias_racing Light Load Member

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    Yeh...then I may have to reconsider... I dont want to do an inframe out the gate. My truck just caugt on fire, was totalled out, and paid off. I got 1500.00 bucks. Would have been 2500 except for the deductible. So this is what I have to work with money wise. I wanted to go with pre eld and less expensive I don't however want to dive into a hole. I understand the slightly oxymoronic situation believe me...
     
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  7. Bias_racing

    Bias_racing Light Load Member

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    Im thinking about it...he said it has sat, (sold his other truck, works on a farm now) he had to clean the tanks to get it running but only got one cleaned good...; I peeked into the other tank and I was thinking varnish but I just ran across some pics and it actually kinda looks like algae /varnish. Any chance that could be it?
     
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  8. Bias_racing

    Bias_racing Light Load Member

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    And yes I would but this is bfe Missouri, Ive also sold an item or two and didnt give as much of a #### as I should, but thats not typically how i sell things. Clean it up disclose the issues and let the chips fall‍♂️
     
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  9. Old Man

    Old Man Road Train Member

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    It could be a bad rocker roller or a bad cam lobe. I’d pass, no way to tell for sure till You open it up.
    I had a roller on rocker arm break and beat up cam. Computer said injector was miss firing, but it was because of broken roller.
     
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  10. Bias_racing

    Bias_racing Light Load Member

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    I havent messed with detroits before but Im assuming I can pop the valve cover off and inspect that right? Dude doesn't have a problem with me doing it.
     
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  11. Old Man

    Old Man Road Train Member

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    You can see the valve train with the cover off.
     
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