hesitation from pinging or clutch slipping?

[madfast]

Ok, I got a question for you nsx owners. My 93 is equipped with the dali chip so dunno if this has anything to do with it. Whenever I gun it on 1st all the way to maybe 7krpm and then shift quickly to 2nd and gun it...the car suddenly halts like it's pinging or detonating. and of course the rpm drops to about 3rpm and starts from there. what does that mean? detonation or is the clutch slipping.
scenario 2: if I gun it in first and then rapidly shifting to 2nd without going metal to metal on 2nd gear then there is no hesitation. What's the problem guys? dali chip? or clutch or timing is off? pls feel free to share your comments or ideas. MB can you share your thoughts on the issue. Thanks so much in advance. This concerns me very much cuz it's mechanical.

 

[madfast]

but if the clutch is slipping then wouldn't the rpm go higher than drop to 3000rpm? what's going on guys? anybody?

 

[nsxtasy]

It sounds like the TCS is operating normally.

Try using the button on the dash to turn the TCS off and see if it still does it.

[This message has been edited by nsxtasy (edited 02 November 2002).]

 

[madfast]

nsxtasy,
ok I'll try that tomorrow. thanks for the advice. but I don't remember seeing the tcs lighting up as I did this. Thanks and i"ll keep you posted

 

[nsxtasy]

P.S. If the clutch is slipping, it usually means that the engine revs are high but the engagement is not complete. The fact that the revs are low sounds like the clutch is not slipping.

 

[ScienceofSpeed]

Detonation won't cause what you are describing. In fact, I don't understand what you are describing. A slipping clutch, with throttle application, will allow the engine to rev up disproportionate to the road speed. It would rev up, not down. Can you describe more of what you are seeing?

 

[BadCarma]

thats not detonation im positive.btw the tcs light does not come on when its activated.the light displays when you push in you button on gauge pod that is clearly marked TCS.when you push it in the light will come on and that indicates that you have DISABLED TCS.like ken said drive around like that for a while and see if your symtoms goes away.as for the clutch are you smelling it? to test it try driving up a slight incline in second and at moderate throttle when you hit around 4 k rpm jab you clutch pedal in quickly and get of it fast without shifting gears.it should grab hard or jerk your head back a tad when it grabs.hope that helped.
david

 

[matteni]

I believe (based on limited information BTW) one or more of your ignition coil packs has gone bad. I believe it feels very much like what you are talking about.

Good luck

 

[nsxtasy]

Originally posted by BadCarma:
the tcs light does not come on when its activated.the light displays when you push in you button on gauge pod that is clearly marked TCS.when you push it in the light will come on and that indicates that you have DISABLED TCS.

There are two different TCS lights on the dash. One indicates when TCS is disabled, as you are describing here. The other is supposed to flash on a momentary basis when TCS activates.

 

[madfast]

I asked the previous owner and he said he never experience this b4. He said that I was shifting to 4th gear. I don't think that's the case cuz I did it 3times with the same result. here is the problem again.
ok, gunning 1st gear metal to metal (@7200rpm) shift to 2nd metal to metal again and the rpms start to climb again but suddenly there is like a fuel cut and rpms drop to about 3000rpm. I am thinking is either the tcs kicking in like nsxtasy said or it's the ignition coils. I am going to take the ignition coils out and check them out according to what the repair manual says. I'll keep you guys posted and pls feel free to share more ideas.

Regards,

Dave

 

[BadCarma]

learn something new everyday.I did not know the TCS flashed when activated as I have never used it.I have always disabled it since I owned the car.as for your problem mad,you might as well check out your fuel filter while your at it.long shot but it cant hurt.do you know the last time it was changed out?
david

 

[madfast]

Badcarma,
thanks to you too buddy. I am going to check everything. thanks.

 

[sjs]

I think they've got you on the right track for initial DIY troubleshooting, but do the simplest of the tests first by pressing the little button to disable the TCS and see if that does the trick. If you are running non-original size wheels and/or tires they could be contributing to early TCS activation. Check the coils next, and while they're out you might check the condition of the plugs, assuming you know enough to do a good visual inspection of them. After those and the filter there are probably numerous small gremlins possible but it may be time to take it to someone more experienced. If the Dali chip was installed with a socket I would also swap that back to stock. Even if that has nothing to do with your problem it will simplify service for someone else.

BTW, just to help with the lingo, I think the phrase you are looking for is "pedal to the metal" as in throttle to the floor. Metal to metal doesn't really convey the idea for me without a lot of thinking, and I hate to think.

Good luck, and let us know what you find so we can all learn from it.

 

[madfast]

sjs,
thanks so much buddy for laying all down. that's exactly what I am going to do today. metal to the metal...hehehe funny I put it that way. your right pedal to the metal. I should just say WOT heheheeh Thanks buddy and I'll keep you posted with my findings.

p.s. I am using stock 93 rims and tires.

Regards,

Dave

 

[madfast]

first and foremost, I'd like to thank all the owners that posted here to give me advice as I am sure many know that I just acquirired this ride. Ok guys, everything is fine with the car. I first went to the Mobil 1 station and filled it up with 93 gas. I was using BP (amoco 93) b4...I guess that was the culprit. I gunned it all the way and did the same thing and there is no hesitation. It's normal now. yep, it was from detonation from cheap fuel. I am never going to use Amoco BP again. Thanks guys! I feel so relieved.

REgards,

Dave

 

[BadCarma]

Originally posted by madfast:
first and foremost, I'd like to thank all the owners that posted here to give me advice as I am sure many know that I just acquirired this ride. Ok guys, everything is fine with the car. I first went to the Mobil 1 station and filled it up with 93 gas. I was using BP (amoco 93) b4...I guess that was the culprit. I gunned it all the way and did the same thing and there is no hesitation. It's normal now. yep, it was from detonation from cheap fuel. I am never going to use Amoco BP again. Thanks guys! I feel so relieved.

REgards,

Dave

Mad, it was detonation? I was sure your syptoms were not that.well if you are sure that was it follow SJS advice and inspect your plugs,you will be able tell if any damage was done to one or all.make sure your plugs are still good.I would change them out if I knew it for sure (detonation)on my car.that can be severe on the plugs even to cause the strap to malform or in worst case break off.doubt that happened to you as you would have experienced far worse systoms
david

 

[madfast]

thanks for the advice. I was going to change out the plugs anywayz. I dont' think anything bad happened to the car cuz oil pressure is still the same about 6psi or so and the car pulls the same with no loss in power. I am sure the ecu just retarded the timing the protect the engine. Thanks so much buddy. and take care.

REgards,

Dave