Big problem...
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Registered User
Joined: May 2005
Posts: 3
Big problem...
I have a 84' Nissan 300ZX NA.
Everyday I go to the university or some other far place, I start the engine and I let it warm up for 1-2 mins. Engine runs perfectly like new(its a VG30E rebuilt). Car runs good and have excellent horsepower. But after 5-7 minutes, I accelerate the car and it seems it starts to fail/backfiring a lot. It gives me the problem only when I accelerate.
The weird thing is that I turn off the engine and I start it again, and runs perfectly again but after 5-7 minutes, same problem.
I ran the codes and gave me only 3 1 >> A/C. I checked the cylinder head temperature sensor, the O2 sensor, fuel temp sensor(pressure its good too), I tried with another MAF and another ECU, I changed spark plugs, cables, distributor cap and the rotor, and I still have this problem.
When the car fails, it feels like a injector its not firing well or a spark plug doesnt working well or MAF sensor its bad. Any advice? Thanks in advance.
I look foward to your replies
Everyday I go to the university or some other far place, I start the engine and I let it warm up for 1-2 mins. Engine runs perfectly like new(its a VG30E rebuilt). Car runs good and have excellent horsepower. But after 5-7 minutes, I accelerate the car and it seems it starts to fail/backfiring a lot. It gives me the problem only when I accelerate.
The weird thing is that I turn off the engine and I start it again, and runs perfectly again but after 5-7 minutes, same problem.
I ran the codes and gave me only 3 1 >> A/C. I checked the cylinder head temperature sensor, the O2 sensor, fuel temp sensor(pressure its good too), I tried with another MAF and another ECU, I changed spark plugs, cables, distributor cap and the rotor, and I still have this problem.
When the car fails, it feels like a injector its not firing well or a spark plug doesnt working well or MAF sensor its bad. Any advice? Thanks in advance.
I look foward to your replies
Queen of Yachts
Joined: May 2006
Posts: 2,957
From: warmspott, trollville.......somewhere sailing the seas--fla, virgin islands...wherever....warm water....LOL
plug wires, also, as well as your list----good luck----welcome to this world. there atre alot of smart z gurus here----enjoy yer stay.....and yer z31......i have 3 of them----fun to drive.....
Registered User
Joined: Feb 2005
Posts: 17
Originally Posted by CodeWarrior
I have a 84' Nissan 300ZX NA.
Everyday I go to the university or some other far place, I start the engine and I let it warm up for 1-2 mins. Engine runs perfectly like new(its a VG30E rebuilt). Car runs good and have excellent horsepower. But after 5-7 minutes, I accelerate the car and it seems it starts to fail/backfiring a lot. It gives me the problem only when I accelerate.
The weird thing is that I turn off the engine and I start it again, and runs perfectly again but after 5-7 minutes, same problem.
I ran the codes and gave me only 3 1 >> A/C. I checked the cylinder head temperature sensor, the O2 sensor, fuel temp sensor(pressure its good too), I tried with another MAF and another ECU, I changed spark plugs, cables, distributor cap and the rotor, and I still have this problem.
When the car fails, it feels like a injector its not firing well or a spark plug doesnt working well or MAF sensor its bad. Any advice? Thanks in advance.
I look foward to your replies
Everyday I go to the university or some other far place, I start the engine and I let it warm up for 1-2 mins. Engine runs perfectly like new(its a VG30E rebuilt). Car runs good and have excellent horsepower. But after 5-7 minutes, I accelerate the car and it seems it starts to fail/backfiring a lot. It gives me the problem only when I accelerate.
The weird thing is that I turn off the engine and I start it again, and runs perfectly again but after 5-7 minutes, same problem.
I ran the codes and gave me only 3 1 >> A/C. I checked the cylinder head temperature sensor, the O2 sensor, fuel temp sensor(pressure its good too), I tried with another MAF and another ECU, I changed spark plugs, cables, distributor cap and the rotor, and I still have this problem.
When the car fails, it feels like a injector its not firing well or a spark plug doesnt working well or MAF sensor its bad. Any advice? Thanks in advance.
I look foward to your replies
I have the exact same problem, but if i warm it up just right, it runs fine. If i don't warm it up, it will bog the same exact way as yours. I havent figured out how to fix it yet, but im guessing that it might be the cold start valve/sensor (not completely sure if it even has one or the other). I will let you know if i fix it. If you figure it out, let me know too.
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