Question about 1985 Nissan King Cab

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Engine bogs down

1985 Nissan truck
Starts up and idles ok. When accelerating (or attempting to) it bogs and usually dies. I can drive it but I have to rev it up like crazy and it hesitates badly.

I just bought this truck and it was running fine for a few weeks.

I believe it did sit for a long time but I have had no issue before now and I have been through 5 tanks of gas.
It has new carb - new plugs - any ideas?
Help?

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  • Jacob Boswell
    Jacob Boswell Feb 02, 2015

    I have the same problem with my pick up. I think it is a fuel issue.

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Whatever your problem is, I would guess that it happened after you began to drive it. I would consider looking for a vacumn leak. Plus, it would be helpful to know how the carb change affected the problem, as it does seem like fuel.

There are inline fuel filters under neather the truck body that may cause a problem, as well.

But I still feel that based on the limited amount of information, I would look for a vacumn leak. For example, if it has power brakes, a leaking hydrobooster can leak vacumn and throw of your air/fuel ratio. Vacumn pressure at idle should be 14.2, and at a higher idle should drop to about 12 or 11 inches of vacumn.
Bill

Posted on Nov 19, 2008

  • timunrau Jan 24, 2011

    Make sure you have the right right spark plugs. The 4 cylinder Nissans had 8 plugs that year. (I currently have two of these trucks waiting for some attention). Four for intake side and 4 for exhaust side...and they are different plugs. I put the same ones in both sides and my truck would not make eighty kilometers/hr and steadly lost power after that point.

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