Question about 1987 Nissan Pickup
Out of the blue yesterday my 1987 Nissan pickup with a z24 four cylinder started cutting out under a load. the best way to describe it it is as though a govener is kicking in and shutting the motor down until i let off the throtle. I have already replaced the plugs, wires, cap, rotor, pcv, and fuel filter, with no change. is there a throtle position sensor i should be checking? or could this be a valve issue?
It is your coil. One coil cuts out under load and the other one runs full time. It'll run on either coil alone just fine. Your problem is that the one that is supposed to run full time has gone bad, the other coil which is supposed to cut out under heavy load is the only coil running your car. When it cuts out, the truck wants to quit until you let off and the computer (ECU) allows it to come back on. Should be able to find a new coil for $40 bucks. Good luck.
Posted on Mar 24, 2010
My 84 nissan king cab with the Z24 and carburetor fuel delivery system exhibited the same symptom out of the blue when I was driving down the road. The truck started bucking and sputtering as if it was losing fuel delivery to the engine and was barely able to get the truck home. Once home I verified that fuel was at the correct position on the float bowl glass sight when the engine was running and that all of the vacuum lines and connections were intact. But the truck still wouldn't run under load as when taking off. After revving the engine several times it seemed to magically cure itself. I drove the truck for about a week and the problem appeared again almost stranding me. After revving the engine, once again it seemed to cure itself.
What it turned out to be was the EGR valve sticking open with the engine under load and causing the engine to act as if it had a huge vacuum leak as the EGR is on the intake side of the carb butterfly valve. The EGR would unstick under the right vacuum condition apparently curing itself. I plugged the vacuum line to the EGR valve as a temporary fix and the problem never returned.
The solution is to remove the EGR valve and clean it with carb cleaner until the EGR action isn't sticking anymore. Soak the EGR pipe fittings with several soakings of Powerlube. Rap on the soaking fitting with a ball peen hammer several times to allow the Powerlube to soak into the rusted fittings. This should help facilitate the removal of the fittings as they are usually rusted on.
Posted on Aug 30, 2009
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Posted on Jan 02, 2017
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