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Discussion Starter · #1 ·
Ok I went through all of the components in the fuel system and replaced all hoses, soaked the bar, and all that stuff. Found the faulty injector and replaced it. SO now here is my BIGGEST problem....the fuel pump cycles in and out after the car has warmed up. It is brand new so I hope that isn't the problem here! Anyways it causes the car to backfire and feel like you have taken your foot off of the gas. If you release the gas pedal it takes it a minute to recover and it idles just fine. BUT you give it gas it will have power for a second then the fuel pump will slow down and the car starves for gas. (The fuel pump goes quiet for a sec then begins to make its normal noise again and the engine stabilizes). Is there a sensor that controls the fuel flow to the system?? I replaced the pressure regulator on the fuel bar it helped but still not enough. Do the oxygen sensors have anything to do with the fuel control?? Cleaned computer contacts too. Please help!!
 

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Discussion Starter · #3 ·
Re: HELP! '83 280ZX brought back to life in troubl

> Ok I went through all of the components in
> the fuel system and replaced all hoses,
> soaked the bar, and all that stuff. Found
> the faulty injector and replaced it. SO now
> here is my BIGGEST problem....the fuel pump
> cycles in and out after the car has warmed
> up. It is brand new so I hope that isn't the
> problem here! Anyways it causes the car to
> backfire and feel like you have taken your
> foot off of the gas. If you release the gas
> pedal it takes it a minute to recover and it
> idles just fine. BUT you give it gas it will
> have power for a second then the fuel pump
> will slow down and the car starves for gas.
> (The fuel pump goes quiet for a sec then
> begins to make its normal noise again and
> the engine stabilizes). Is there a sensor
> that controls the fuel flow to the system??
> I replaced the pressure regulator on the
> fuel bar it helped but still not enough. Do
> the oxygen sensors have anything to do with
> the fuel control?? Cleaned computer contacts
> too. Please help!!

Are you sure it's starving? I had the same symptoms due to a very over rich condition.
A bad temp sensor was replaced and voila' On the road again..

ciao, bobw
 

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107,695 Posts
Discussion Starter · #4 ·
Re: HELP! '83 280ZX brought back to life in troubl

> Ok I went through all of the components in
> the fuel system and replaced all hoses,
> soaked the bar, and all that stuff. Found
> the faulty injector and replaced it. SO now
> here is my BIGGEST problem....the fuel pump
> cycles in and out after the car has warmed
> up. It is brand new so I hope that isn't the
> problem here! Anyways it causes the car to
> backfire and feel like you have taken your
> foot off of the gas. If you release the gas
> pedal it takes it a minute to recover and it
> idles just fine. BUT you give it gas it will
> have power for a second then the fuel pump
> will slow down and the car starves for gas.
> (The fuel pump goes quiet for a sec then
> begins to make its normal noise again and
> the engine stabilizes). Is there a sensor
> that controls the fuel flow to the system??
> I replaced the pressure regulator on the
> fuel bar it helped but still not enough. Do
> the oxygen sensors have anything to do with
> the fuel control?? Cleaned computer contacts
> too. Please help!!

Are you sure it's starving? I had the same symptoms due to a very over rich condition.
A bad temp sensor was replaced and voila' On the road again..

ciao, bobw
 
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