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Discussion Starter #1
I have a 82' 280zxt. What I thought was a leaking exhaust/intake gasket was just the peak of my problems. Now when driving in the car it will not accelerate past 55 from time to time. This is what is happening... When I am driving down the road and apply the gas the car will accelerate fine but then it will start to miss. If I really get on it, it is as if the motor is spinning but there is no pwer being produced. If I get off it and back on it some times it will accelerate normally. My dad thinks its a timing problem. I am good machanicly and would like to fix it myself to save money. If not it is going in the shop on Tuesday. Any help is appreciated.
 

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This could be attributable to a number of things.

The ignition system is probably not able to keep up with the demands on the engine. To diagnose this type of problem would take a book at this juncture. Hopefully you are a electrically competent as you are mechanical. The most common problems are: 1) loose electrical connections at the ignition coil or a bad coil resistor, 2) an ignition coil that needs to be replaced (use 30,000volt or better - high performance strongly suggested), 3) your charging system is failing - low voltage available; could be a bad battery [won't hold charge] or a bad alternator, 4) low fuel pressure [check fuel filter]; If you filled up the gas tank recently there's a [remote] possibilty you got bad gas..

Checking electrical connections and performance of the charging system are the easiest clues to follow. Good Luck.

> I have a 82' 280zxt. What I thought was a
> leaking exhaust/intake gasket was just the
> peak of my problems. Now when driving in the
> car it will not accelerate past 55 from time
> to time. This is what is happening... When I
> am driving down the road and apply the gas
> the car will accelerate fine but then it
> will start to miss. If I really get on it,
> it is as if the motor is spinning but there
> is no pwer being produced. If I get off it
> and back on it some times it will accelerate
> normally. My dad thinks its a timing
> problem. I am good machanicly and would like
> to fix it myself to save money. If not it is
> going in the shop on Tuesday. Any help is
> appreciated.
 

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> This could be attributable to a number of
> things.

> The ignition system is probably not able to
> keep up with the demands on the engine. To
> diagnose this type of problem would take a
> book at this juncture. Hopefully you are a
> electrically competent as you are
> mechanical. The most common problems are: 1)
> loose electrical connections at the ignition
> coil or a bad coil resistor, 2) an ignition
> coil that needs to be replaced (use
> 30,000volt or better - high performance
> strongly suggested), 3) your charging system
> is failing - low voltage available; could be
> a bad battery [won't hold charge] or a bad
> alternator, 4) low fuel pressure [check fuel
> filter]; If you filled up the gas tank
> recently there's a [remote] possibilty you
> got bad gas..

> Checking electrical connections and
> performance of the charging system are the
> easiest clues to follow. Good Luck.
Sounds like fuel supply check fuel pump, filter, and pressure regulator. Very unlikely but your gas tank could be clogged. Take the fuel line off the output of the gas tank and make sure you aren't getting alot of rust out of it. Lucky you a good gas tank for an 82 isn't hard to find. I've even got one to sell you if your in the SC area.
 

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Check the Throttle Position Switch, clean the connection.
also check the airflow meter make sure it the connections are clean and the flap is not sticking.

hope this helps you out.

> I have a 82' 280zxt. What I thought was a
> leaking exhaust/intake gasket was just the
> peak of my problems. Now when driving in the
> car it will not accelerate past 55 from time
> to time. This is what is happening... When I
> am driving down the road and apply the gas
> the car will accelerate fine but then it
> will start to miss. If I really get on it,
> it is as if the motor is spinning but there
> is no pwer being produced. If I get off it
> and back on it some times it will accelerate
> normally. My dad thinks its a timing
> problem. I am good machanicly and would like
> to fix it myself to save money. If not it is
> going in the shop on Tuesday. Any help is
> appreciated.
 

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107,695 Posts
How do you clean a the throttle position switch?n/

m
> Check the Throttle Position Switch, clean
> the connection.
> also check the airflow meter make sure it
> the connections are clean and the flap is
> not sticking.

> hope this helps you out.
 

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Check your connection at the Control box located on the drivers side kick panel... These connections are known to go bad and send false readings to the injection system. Remove large connector and clean with a electronic cleaner, then re-connect, hope this helps...
 

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control box connections

I thought that there was a sticker on the
control box that said not to remove that
large connector. Or should I disregard that
and clean the connections anyways.

> Check your connection at the Control box
> located on the drivers side kick panel...
> These connections are known to go bad and
> send false readings to the injection system.
> Remove large connector and clean with a
> electronic cleaner, then re-connect, hope
> this helps...
 

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Discussion Starter #8
GOT IT

It was a two part problem. The wire harness on the ecu was dirty (how I dont know). and my fuel pump is not giving adequite pressure along with my fuel pressure regulator. What is the proper fuel pressure for a 82' 280zxt? Also is it worth the $300 for a nissan pump or should I just get a autopart store one? Thanks for all the help.
 

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i too believe it might be a fuel delivery problem. i had a similar problem with a 77. check fuel pressure...it should be around a steady 36 psi...if not look into your fuel pump or fuel pressure regulator (and vacuum hose connection too!), and if it is not a steady pressure, you might consider swaping out your fuel dampener (located right after your fuel pump around the right rear wheel well). also, you could have a problem with your throttle switch....to check that, there are three pins....pair up the first-middle and then last-middle....i can remember which, but one is the idle switch and the other was the full throttle switch (approx 34 degrees open throttle). in any event, open and close the butterfly while measuring the continutity at either pair of pins....if you notice a difference in continutity between full open and closed on both pairs of pins then its probably okay. lastly, check your air box....check the resistance change as the flap opens and closes..... good luck!
 
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