Shaky engine feeling? Please help.
- Thread starter 201
- Start date
Hi 201,
I'm not sure what you mean by 'shaky'. If you mean that the car will move with the engine idling the answer is no, that should not be the case.
Every NSX I've been in was rock-solid at idle and even when revving the engine at stand-still the car itself would not vibrate at all.
I'm not sure what you mean by 'shaky'. If you mean that the car will move with the engine idling the answer is no, that should not be the case.
Every NSX I've been in was rock-solid at idle and even when revving the engine at stand-still the car itself would not vibrate at all.
MvM was trying to explain that it should NOT feel shaky at all.
What is your idle RPM ?
Mich
What is your idle RPM ?
Mich
If it feels like it is both shaky when its idling and when you are driving, then you may need to tighten your engine mounts. And at 90k making sure your engine mounts are the correct tension/torque doesn't hurt either.
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www.acrmotorsports.com / 949-929-8973
[This message has been edited by ACR_Motorsports (edited 17 January 2003).]
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www.acrmotorsports.com / 949-929-8973
[This message has been edited by ACR_Motorsports (edited 17 January 2003).]
201,
The NSX engine has an inherent harmonic vibration at about 1400 rpm. At idle it is pretty smooth though. Before you draw any conclusions, I suggest you meet up with a few other NSX owners in your area and compare. I do sense a small vibration at idle, very small, in my 1991, and I know it runs fine. It is just hard to convey "very small" in an e-mail!!
HTH,
LarryB
The NSX engine has an inherent harmonic vibration at about 1400 rpm. At idle it is pretty smooth though. Before you draw any conclusions, I suggest you meet up with a few other NSX owners in your area and compare. I do sense a small vibration at idle, very small, in my 1991, and I know it runs fine. It is just hard to convey "very small" in an e-mail!!
HTH,
LarryB
There is insufficient info in your post to enable or expect a conclusive response. You describe a 'rough idle' condition, but rough idle is relative, and you haven't provided any relativity. Did you just buy the car and you're comparing it with your Accord/TL/Civic? Is it now idling more roughly than it did the first 10 years you owned it? Is it rougher than other NSXs you've experienced? You must relate it to SOMETHING.
In general, and based on my experience with just a handfull of NSXs:
The idle of the NSX engine would not normally be described as "smooth". There is some "roughness" to the idle of a stock NSX engine which is normal and operating in-spec. Until I test-drove several, I wasn't absolutely certain what "normal" was either. I found they all felt exactly the same, as have the two I've owned. The roughness I'm describing is perfectly normal, and is due to the camshafts/valve timing. If you're comparing it with your Legend, it will not feel like that. You will notice more roughness in the NSX idle. On the other hand if it's idling as roughly as the Hemi you used to drive, then you have a problem you need to diagnose. Again, you must relate it to something.
Everything has its price, and I feel (as Honda felt) that the slight roughness of the NSX engine's idle is a small price to pay for its wonderful characteristics/power band. This particular tradeoff is a classic one.
Because the normal NSX idle isn't perfectly smooth like a typical Honda, your only options are to get the opinion of another owner or tech in your car, or find the opportunity to sit in a couple of others. With the NSX population in the bay area, that shouldn't be too difficult. If theirs feels like yours but the owner says his idle is perfectly smooth, just set a cup of coffee on the console and have him watch it a minute.
Richard
'93 Blk/Blk
In general, and based on my experience with just a handfull of NSXs:
The idle of the NSX engine would not normally be described as "smooth". There is some "roughness" to the idle of a stock NSX engine which is normal and operating in-spec. Until I test-drove several, I wasn't absolutely certain what "normal" was either. I found they all felt exactly the same, as have the two I've owned. The roughness I'm describing is perfectly normal, and is due to the camshafts/valve timing. If you're comparing it with your Legend, it will not feel like that. You will notice more roughness in the NSX idle. On the other hand if it's idling as roughly as the Hemi you used to drive, then you have a problem you need to diagnose. Again, you must relate it to something.
Everything has its price, and I feel (as Honda felt) that the slight roughness of the NSX engine's idle is a small price to pay for its wonderful characteristics/power band. This particular tradeoff is a classic one.
Because the normal NSX idle isn't perfectly smooth like a typical Honda, your only options are to get the opinion of another owner or tech in your car, or find the opportunity to sit in a couple of others. With the NSX population in the bay area, that shouldn't be too difficult. If theirs feels like yours but the owner says his idle is perfectly smooth, just set a cup of coffee on the console and have him watch it a minute.
Richard
'93 Blk/Blk
Hi all and thanks for the suggestions! Sorry I didnt put anything for it to compare to but I guess I can say the feeling you have when a Harley Davidson is ideling right next to you stopped on a red light. I feel it all around the car like the steering wheel ect. The only thing I can really think of is the engine mounts being old. What do you guys think?
Oops forgot to say that this is my first NSX and have never really driven one before so I dont really know how it should feel normally. Thanks all in advance!
Oops forgot to say that this is my first NSX and have never really driven one before so I dont really know how it should feel normally. Thanks all in advance!
I've never driven another NSX myself, but it may be normal.
I've noticed that I can feel a slight vibration in my car through the steering wheel. Its not prominent, but certainly doesn't feel like a Lexus.
Having said that, it has never bothered me too much. When I've had my car serviced by Don Lam (a credible NSX tech in the SF/Bay Area), he's always test driven the car. He has never told me that my car rides rougher than normal...
Moreover, I almost expect it. It's a supercar afterall right?
[This message has been edited by hyuan (edited 17 January 2003).]
I've noticed that I can feel a slight vibration in my car through the steering wheel. Its not prominent, but certainly doesn't feel like a Lexus.
Having said that, it has never bothered me too much. When I've had my car serviced by Don Lam (a credible NSX tech in the SF/Bay Area), he's always test driven the car. He has never told me that my car rides rougher than normal...
Moreover, I almost expect it. It's a supercar afterall right?
[This message has been edited by hyuan (edited 17 January 2003).]
I can sense a faint roughness that other people sitting in my car have been unable to feel even when pointed out. It sort of feels like a very gentle nudge from the seat.
It sounds as if your idle vibration is a little excessive. In my car the only time I feel a slight vibration is at cold idle (can hear a slight rattle from the passenger seat leather as well when the temperature is below freezing outside. I have never felt any vibration from the steering wheel or surronding body parts......possibly as others have suggested, your engine mounts are worn or loose.....or could be you need to do some basic maintenance like plugs or injector cleaning. Before I purchased my car I drove 3 other NSX's and none of them exhibited the condition you described including the "Harley" vibe.
My 1993 idles as smooth as my Accord. If this just started to occur, I would bet a bad tank of gas, to low of octane, or water in the tank from condensation. A can of fuel injector cleaner and a fresh tank of gas is where I would start.
i noticed the same thing at idle. a vibration that i feel in my lower back, hips and seat bottom. just had car in for 60k and i asked about this specifically. the tech said all mounts were ok and he thought car was perfect. not sure what else to check or if indeed this is normal.
Try here yet?
www.nsxprime.com/FAQ/Troubleshooting/roughidle.htm
www.nsxprime.com/FAQ/Troubleshooting/roughidle.htm
Hi all I just bought a 91 NSX today...and I went straight to my mechanic. He noticed the vibration on my car and said he thinks its a misfire caused by either sparkplugs, injectors or one other item that they replaced on the late model cars its called a cylinder crank sensor. Apparently this is located inside the valve cover on the firewall side facing the right of the car. This component is covered by a plastic / wax or something like that and at high temp it melts. I guess this was the problem but Im actually going to check the small ones first then if it doesnt work I will replace that. The part # if interested is37840-pr7-a02. Good luck .....And WHOOOO hooooooooo I have one now.......
Mike
Ps. the part cost 253.09 CDN retail. and is always back ordered.
Check the obvious things first.
- Is it just a dead hole? Ignitors go out fairly often. Make sure you are getting fire in all six holes.
- Is the throttle body clean and does the butterfly close fully? If it has a lot of varnish/buildup, spray it out with carb cleaner while the car is running.
- Are the vac hoses all connected properly? Can you hear any hissing noises?
- Is it just a dead hole? Ignitors go out fairly often. Make sure you are getting fire in all six holes.
- Is the throttle body clean and does the butterfly close fully? If it has a lot of varnish/buildup, spray it out with carb cleaner while the car is running.
- Are the vac hoses all connected properly? Can you hear any hissing noises?
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