How do I fix my 87 Nissan truck?

Question

The truck stumbles when I step on the gas hard. When I accelerate normal it does fine.

I have done a full tune up to the truck, changed plugs, wires, cap, rotor, fuel filter, air filter, the whole nine yards.

I have done a full tune up to inclued the timing chain. I have gone trough the sensors the they all check out okay but i sense that I am missing something.

I thank you for your info dodge man but the truck is fuel injected. I am thinking that it is the tps because when you do the test it checks out. I think that the bushing it rides on when you rotate it is worn out causing to send a fault to the pcu when you step on it hard. Thank you mikey I am still open for more info.

Answer 1

i own a repair shop,and it sounds like it may just need a simple tune up,that might take care of this ,i own a 87 Nissan coupe,and it was doing this a while back,and i replaced the plugs in it,and it fixed it,but when the plugs get a lot of miles on them they get weak,and wont fire good under pressure,and that causes an engine to stumble like that once in a while,id also replace the plug wires too,the get a lot of heat put on them,and it makes them brittle,and they will cause weak fire also,if this don't help it ,try the gas filter ,all this together cost less than 50 bucks ,and will probably make your truck run a 100% better ,good luck,i hope this help,s.

Answer 2

Since you did all those things, it sounds like the accelerator pump in your carburetor may not be working properly. When you step on the gas (especially quickly) there is a diaphragm operated mechanically that gives an inital squirt of fuel while the carb makes the transition from idle (off-idle) to main jet operation. If this is so, you may as well rebuild the carb. You can check by operating the carb manually while looking down inside the carb. Open the throttle quickly with the engine not running and watch for a quick squirt of fuel. If there is none, or a weak trickle, that's the problem. Don't do this too many times with the engine off, because if it is working, you will flood the engine with gas. That is if you have a carbureted NAPZ 8-plug motor. If it is fuel injected that is a different story, you will need professional diagnosis.

Answer 3

you need to have your timing checked, it may be time to replace the chain, you could have a mechanic adjust your timing, also try a tune up. good luck!

Answer 4

replace the gas filter