I have had my 91' NSX since nov. of last year. since purchase i have had a rough idile and faint sounds of backfire at idile :frown:. I then took it to my friend which is a mechanic and he suggested changing the spark plugs. After all it didn't change a thing. Does anyone know what could be wrong? HELP PLEASE!!!!!!
Rough Idle With Sounds Of Backfire
- Thread starter PROJECTNSX
- Start date
Re: Rough Idile With Sounds Of Backfire
Before doingf anythiong else you should have a compression check done. Once you can confirm the engine is sound mechanically (valves, rings, etc) then you can look at other things.
When the plugs were replaced were they looked at for their condition?
HTH,
LarryB
Before doingf anythiong else you should have a compression check done. Once you can confirm the engine is sound mechanically (valves, rings, etc) then you can look at other things.
When the plugs were replaced were they looked at for their condition?
HTH,
LarryB
Re: Rough Idile With Sounds Of Backfire
did u clean the TB, check the coil packs?
http://www.danoland.com/nsxgarage/spark_plugs/spark_plug.htm
PROJECTNSX said:
did u clean the TB, check the coil packs?
http://www.danoland.com/nsxgarage/spark_plugs/spark_plug.htm
Re: Rough Idile With Sounds Of Backfire
the condition of the plugs looked to be in good shape. the motor runs fine with no power loss (that i can tell). as for cleaning the TB i have not done that yet. i never would have thought the TB would give a backfire. ive been in the market for a supercharger but i dont want to add if the motor has issues. any other suggestions?
Larry Bastanza said:
the condition of the plugs looked to be in good shape. the motor runs fine with no power loss (that i can tell). as for cleaning the TB i have not done that yet. i never would have thought the TB would give a backfire. ive been in the market for a supercharger but i dont want to add if the motor has issues. any other suggestions?
Re: Rough Idile With Sounds Of Backfire
Reread LarryB’s post above. As Larry said, a compression test will open the door to a systematic diagnosis. Otherwise, you can spend a lot of time and money replacing and checking things that are just fine. Let us know how the test comes out.
Good luck,
DanO
PROJECTNSX said:
Reread LarryB’s post above. As Larry said, a compression test will open the door to a systematic diagnosis. Otherwise, you can spend a lot of time and money replacing and checking things that are just fine. Let us know how the test comes out.
Good luck,
DanO
Re: Rough Idile With Sounds Of Backfire
You may also check the exhaust manifold (plus the screws where it is fixed at the engine) for leaks. Any backfires when you release the throttle at neutral?
You may also check the exhaust manifold (plus the screws where it is fixed at the engine) for leaks. Any backfires when you release the throttle at neutral?
Re: Rough Idile With Sounds Of Backfire
Moisture in the top of the coil packs caused a similar problem for me as well. Check your coils and if they are good, like the rest of the guys suggest do a leak down test.
Moisture in the top of the coil packs caused a similar problem for me as well. Check your coils and if they are good, like the rest of the guys suggest do a leak down test.
Re: Rough Idile With Sounds Of Backfire
No backfires when i release the throttle, that i can hear. car seems to run perfect. im going to get a compression test this weekend and have the results by mon. i will let all know what the results are. :wink:
NSX-Racer said:
No backfires when i release the throttle, that i can hear. car seems to run perfect. im going to get a compression test this weekend and have the results by mon. i will let all know what the results are. :wink:
Re: Rough Idile With Sounds Of Backfire
No backfires when i release the throttle, that i can hear. car seems to run perfect. im going to get a compression test this weekend and have the results by mon. i will let all know what the results are. :wink:
NSX-Racer said:
No backfires when i release the throttle, that i can hear. car seems to run perfect. im going to get a compression test this weekend and have the results by mon. i will let all know what the results are. :wink:
Re: Rough Idile With Sounds Of Backfire
I am having the Idle problem now. Anyone have answer to this problem? thanks
I am having the Idle problem now. Anyone have answer to this problem? thanks
Re: Rough Idile With Sounds Of Backfire
You mentioned "the motor runs fine with no power loss".
Before you drive yourself nuts on this, please note that these cars have a somewhat rough idle (90 degree V-6). I'm also not sure what you mean by "faint" sounds of backfire at idle. Is it possible your car is wholly normal (for an NSX)?
Do you have anyone near you with an NSX that you can listen to, to compare?
Hoping it's perception only, and please note that I'm not trying to be condescending :smile: . . . .
You mentioned "the motor runs fine with no power loss".
Before you drive yourself nuts on this, please note that these cars have a somewhat rough idle (90 degree V-6). I'm also not sure what you mean by "faint" sounds of backfire at idle. Is it possible your car is wholly normal (for an NSX)?
Do you have anyone near you with an NSX that you can listen to, to compare?
Hoping it's perception only, and please note that I'm not trying to be condescending :smile: . . . .
Coil pack!
had this problem last month
idles fine when cold
idles rough with sounds of backfire when warmed up
hesitation under 3k
feel loss of power
Took it to Ben @ Daisy auto and turned out to be the coil packs in the rear bank... again.. Water get into them and they are ruined.
Don't drive the car during downpour.. don't take it to automated car washes.. stuff a big plastic bag over the rear intake when washing the car.
idles fine when cold
idles rough with sounds of backfire when warmed up
hesitation under 3k
feel loss of power
Took it to Ben @ Daisy auto and turned out to be the coil packs in the rear bank... again.. Water get into them and they are ruined.
Don't drive the car during downpour.. don't take it to automated car washes.. stuff a big plastic bag over the rear intake when washing the car.
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