Question about 1985 Honda Prelude

3 Answers

89chevy truck runs roughly

Could it possibly a carburetor problem?

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  • duocmarie Aug 25, 2009

    No it isn't a fuel injected, it is a throttle body. What do you mean by pulling plug wires? Pull them while the car is running? isn't that somewhat dangerous?

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Isn't it fuel injected? More likely:
Pull plug wires one at a time, the one that has no effect isn't firing. Bad plug or wire.

Posted on Aug 25, 2009

  • Anonymous Aug 25, 2009

    Yes, tbi fuel injection. I'd pull pvc valve and shake it up and down. No rattle means it is bad. Then pull plug wires one at a time (and then put back on before pulling next one). If it doesn't get rougher with a plug it isn't firing. Won't hurt you and isn't dangerous. Don't touch vehicle while touching wire or you can get a harmless but jolting shock. If all slow/roughen idle, I'd probably think dirty fuel injector next.


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If it has one it might. Many engines of this era used some form of fuel injection. Chevrolet liked throttle body injectors that had only one injector on their V-6's. Does the truck have a check engine light that is on? This means that it is injected and computer controlled. If the light is on, rent a scanner and read the code(s) out to pursue to repairs. If the truck has no such light, then the engine is probably a large V-8 with a carburetor. 'Runs roughly' could be many things--bad spark plugs and wires, water in the fuel, air leaks in the intake manifold area, bad EGR valve, plugged air cleaner, plugged fuel filter, weak fuel pump, and the list goes on. A good mechanic makes tests to narrow the problem(s) down, or you can 'shotgun' the problem with new parts until it works.

Posted on Aug 25, 2009

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YEP IF IDLING TOO LOW.IDLE DIRTY AIR FILTER. MIXTURE SCREWS IMPROPERLY ADJUSTED.VACUUM LEAK AT CARBURETOR GASKET ON INTAKE.PVC SYSTEM CLOGGED.A DEFECTIVE EGR VALVE.ALL OF THESE PROBLEMS CAN CAUSE ROUGH IDLING.IF ENGINE HAS HIGH MILES ON IT DO A COMPRESSION TEST.WEAK CYLINDERS WITH LOW COMPRESSION DUE TO WORN VALVES. WILL ALSO CAUSE ROUGH IDLING.

Posted on Aug 25, 2009

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