Help - 1990 300ZX engine sputters at high RPM's
#1
Registered User
Thread Starter
Join Date: Dec 2006
Location: PA
Posts: 2
Likes: 0
Received 0 Likes
on
0 Posts
Help - 1990 300ZX engine sputters at high RPM's
I was referred to this message board by someone on the news groups. I hope this 300ZX question is not out of line on this board - thanks! My 1990 non-turbo zx has 99k, has been reasonably well taken care of
and has given me very little trouble over the years. Recently it has
begun to die out at rpm's over 4k. It acts almost like it is hitting a
rev limiter. If I let off the gas a bit the rpm's will begin to climb
some, but obviously with little power. The problem seems to be worse in
higher gears suggesting power might somehow be involved. If I rev it
with the clutch in, no problem - flies high. Also - when the RPM's
stop going up - the car stops accelerating (as you would figure!)
however it sounds like something is still revving up... Very strange. If it
were not for the RPM needle not going up I might think it was
transmission related but this definitely feels like the engine. What does this
sound like? Any chance its fuel injectors or something? Could it be
plugs? The plugs only have about 30k on them, but it has taken a long
time to put those miles on - maybe they needed cleaned? Any ideas
would be helpful - thanks!
Chris.
and has given me very little trouble over the years. Recently it has
begun to die out at rpm's over 4k. It acts almost like it is hitting a
rev limiter. If I let off the gas a bit the rpm's will begin to climb
some, but obviously with little power. The problem seems to be worse in
higher gears suggesting power might somehow be involved. If I rev it
with the clutch in, no problem - flies high. Also - when the RPM's
stop going up - the car stops accelerating (as you would figure!)
however it sounds like something is still revving up... Very strange. If it
were not for the RPM needle not going up I might think it was
transmission related but this definitely feels like the engine. What does this
sound like? Any chance its fuel injectors or something? Could it be
plugs? The plugs only have about 30k on them, but it has taken a long
time to put those miles on - maybe they needed cleaned? Any ideas
would be helpful - thanks!
Chris.
Last edited by pcgen1; 12-01-2006 at 06:46 AM.
#4
New Member
iTrader: (5)
Join Date: Nov 2006
Location: El Centro, Ca.
Posts: 3,503
Likes: 0
Received 0 Likes
on
0 Posts
did you say that your SPARK PLUGS have 30,000 miles on them?!!! Change them!!!
BTW you would have better luck here
http://www.300zxclub.com/
BTW you would have better luck here
http://www.300zxclub.com/
Last edited by MR_X; 12-01-2006 at 10:20 PM.
#5
Registered User
Join Date: Nov 2006
Location: Arlington, TX
Posts: 42
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by MR_X
did you say that your SPARK PLUGS have 30,000 miles on them?!!! Change them!!!
BTW you would have better luck here
http://www.300zxclub.com/
BTW you would have better luck here
http://www.300zxclub.com/
#6
Banned
iTrader: (44)
lol. a REALLY good Nissan tech told me 9 out of ten times when you take it in for spark plug changes they NEVER change the rear spark plug for the passenger side bank Ithink, cause it is SO hard to get to and they can only charge a certain amount and it takes too long.
that is why those cylinders are always weaker on those cars.
spark plugs and fuel pump are good, what about coils? possibly damaged also wiring. could be rotting wiring. did the car sit long?
that is why those cylinders are always weaker on those cars.
spark plugs and fuel pump are good, what about coils? possibly damaged also wiring. could be rotting wiring. did the car sit long?
Trending Topics
#8
Registered User
Thread Starter
Join Date: Dec 2006
Location: PA
Posts: 2
Likes: 0
Received 0 Likes
on
0 Posts
Fuel pump replaced
Had the fuel pump replaced. It improved the situation, in fact at first I thought it was all better. Now, when the engine is cool it will grant most power all the way to redline. When it warms up - will not pass 4500 RPM under WOT in 3rd gear. If I let back on the gas a bit I can get the R's to climb slowly. Still have extra sound at WOT.
Does that fact that the symptoms are worse under WOT as compared to not give any direction as to what the problem could be? I am going to take it in to have it looked at but I would like to offer the mechanic some direction - as you guys may know more about this car than my mechanic (I hate the local dealer).
Thanks again!
Chris.
Does that fact that the symptoms are worse under WOT as compared to not give any direction as to what the problem could be? I am going to take it in to have it looked at but I would like to offer the mechanic some direction - as you guys may know more about this car than my mechanic (I hate the local dealer).
Thanks again!
Chris.
Thread
Thread Starter
Forum
Replies
Last Post