dcwiker05
08-13-2009, 06:29 PM
I have an 89 240SX with about 148K on it. I had an issue with the exhaust manifold gasket for the rear 2 cylinders breaking causing an exhaust leak that affected the car to the point that it would only stay running for roughly 2 minutes.
I have replaced the gaskets and the water pump because I needed one. The car is now kind of pulsing when driving. It is very slight and hard to describe but it feels as if it has mini surges in power fallowed by slight laps in power. It does not die at all while driving although occasionally shift hard (automatic : / ) But anyhow it drives fine just you can notice seemingly wave like power and also a slight whistle like noise, similar to a turbo but not as pronounced. My car carries the stock engine so no turbos sadly.
Now the next thing is when I am done driving the car and go to park it all is well until I put the car into neutral or park. The idle then floats between 700 down to 200 RPM till it eventually kills itself... If I put it into any gear reverse drive 1st 2nd it doesn't matter the idle quickly returns to its normal roughly 800 RPM range, disengaging the gear reengages the problem...
To further stupify the water seems to be hot but the gauge never reads above the normal heat leave and the engine block itself while uncomfortable to touch for extended amounts of time is far from abnormally high...
Any help in this situation would be greatly appreciated, Im going to try and get video uploaded to show idle and possible the whistle noise if I can, but until then any ideas based on this description?
A few Ideas I was given and my current answers to them:
Several possibilities:
- Vacuum leak in intake system.
I thought that too but cant seem to find any with the usual method of checking
- Bad O2 sensor.
This is possible the wire to the O2 sensor is pretty much shot Im going to replace it tomorrow any special instructions? Its from the harness to the connector that it got britle and is cracked several places. I was just gonna cut it and solder in new wire.
- Sticking EGR valve.
Details? Not to up to par with this block I have worked on VG30's my entire mechanical history and EGR's on those didn't cause to many issues although they were a pain to get to.
- Dirty fuel filter.
Brand new
- Dirty air filter.
Brand new
- Fouled spark plugs.
Gonna pull them out and look but they wern't an issue less then a week ago dont they normally degrade slowly? Not one day they are ok the next day they are shot?
Thanks for your input Im trying to straighten this out because aside from the slight plusing while driving and whistle the car seems problem free until I go to park then I get this odd idle.
Going to have a friend look at it tomorrow bhopefully he knows hes delt with primarilly 240's although his expirance is on swaped SR20's...
I have replaced the gaskets and the water pump because I needed one. The car is now kind of pulsing when driving. It is very slight and hard to describe but it feels as if it has mini surges in power fallowed by slight laps in power. It does not die at all while driving although occasionally shift hard (automatic : / ) But anyhow it drives fine just you can notice seemingly wave like power and also a slight whistle like noise, similar to a turbo but not as pronounced. My car carries the stock engine so no turbos sadly.
Now the next thing is when I am done driving the car and go to park it all is well until I put the car into neutral or park. The idle then floats between 700 down to 200 RPM till it eventually kills itself... If I put it into any gear reverse drive 1st 2nd it doesn't matter the idle quickly returns to its normal roughly 800 RPM range, disengaging the gear reengages the problem...
To further stupify the water seems to be hot but the gauge never reads above the normal heat leave and the engine block itself while uncomfortable to touch for extended amounts of time is far from abnormally high...
Any help in this situation would be greatly appreciated, Im going to try and get video uploaded to show idle and possible the whistle noise if I can, but until then any ideas based on this description?
A few Ideas I was given and my current answers to them:
Several possibilities:
- Vacuum leak in intake system.
I thought that too but cant seem to find any with the usual method of checking
- Bad O2 sensor.
This is possible the wire to the O2 sensor is pretty much shot Im going to replace it tomorrow any special instructions? Its from the harness to the connector that it got britle and is cracked several places. I was just gonna cut it and solder in new wire.
- Sticking EGR valve.
Details? Not to up to par with this block I have worked on VG30's my entire mechanical history and EGR's on those didn't cause to many issues although they were a pain to get to.
- Dirty fuel filter.
Brand new
- Dirty air filter.
Brand new
- Fouled spark plugs.
Gonna pull them out and look but they wern't an issue less then a week ago dont they normally degrade slowly? Not one day they are ok the next day they are shot?
Thanks for your input Im trying to straighten this out because aside from the slight plusing while driving and whistle the car seems problem free until I go to park then I get this odd idle.
Going to have a friend look at it tomorrow bhopefully he knows hes delt with primarilly 240's although his expirance is on swaped SR20's...