ZCar Forum banner

Status
Not open for further replies.
1 - 2 of 2 Posts

·
Registered
Joined
·
107,695 Posts
Discussion Starter #1
My '79 zx is blowing black smoke, I have replaced the spark plugs, air filter, added injector fuel cleaner, all the injectors were replaced not long ago and they are fine. I have inspected all vacuum line for leaks etc. I took it to a Nissan dealer service shop. The mechanic there tested the fuel system, He found it to have too much pressure. He said that the FUEL PRESSURE REGULATOR was bad. I changed the FPR. Now you don't smell heavy fumes like before, the smoking decreased but there it still some black smoking during hard accelarations. (not quiet as bad). This smoke is black (NOT OIL Blue). The car does not burn oil. The car idles smooth and the acceleration is great as ever. This is the second 280zx that I've owned. I am familiar with Z's performance. Has anyone had this problem before? What else in the fuel EFI may be in need of replacement at 284,000 miles?
 

·
Registered
Joined
·
787 Posts
have you checked the airflow meter. The meter could be out of adjustment after 284,000 miles.

> My '79 zx is blowing black smoke, I have
> replaced the spark plugs, air filter, added
> injector fuel cleaner, all the injectors
> were replaced not long ago and they are
> fine. I have inspected all vacuum line for
> leaks etc. I took it to a Nissan dealer
> service shop. The mechanic there tested the
> fuel system, He found it to have too much
> pressure. He said that the FUEL PRESSURE
> REGULATOR was bad. I changed the FPR. Now
> you don't smell heavy fumes like before, the
> smoking decreased but there it still some
> black smoking during hard accelarations.
> (not quiet as bad). This smoke is black (NOT
> OIL Blue). The car does not burn oil. The
> car idles smooth and the acceleration is
> great as ever. This is the second 280zx that
> I've owned. I am familiar with Z's
> performance. Has anyone had this problem
> before? What else in the fuel EFI may be in
> need of replacement at 284,000 miles?
 
1 - 2 of 2 Posts
Status
Not open for further replies.
Top