Header/engine jumping problem please help!

[goldNSX]

I've installed a taitec header yesterday (actually my garage did it with the 60000 miles service). Cantrell AIS was added too. I've tried it out for about 20 km with no problem. But today I ran into a serios problem: After 30 km nonstop runing (low rev) I had throttle/gas problem after a short (5 minutes) break. I pulled the throttle but it was not accelerating, after 2 seconds it pushed but not linearly. It's was like having no fuel for 2 seconds. I drove very carefully, after 2 minutes the car was ok. I've done some 2nd gear rev-outs and the cars felt very strong. 20 minutes later I had the engine light coming up. So I stopped it and restarted it and it was fine for 30 minutes when the same problem came back.
The problem came back everytime I made a 5 minutes stop or while I was driving very slowly in a town (red lights stop and so on). After driving a while with more than 40mph the problem went away.
I've completed 140 km today.
My first thought was O2-sersor as they have been taken away from the mainfold and transferred into the header. I've read about it in the FAQ. The second thought was main relay. But the car is starting fine.
What shall I do? Driving and cleaning some possible WD-40 from the O2-sersors away or drive back directly to my garage? :confused

Is it possible that the O2-sensor can be too hot? :confused

Thanks in advance,
Thomas

 

[goldNSX]

add-on
I've the same problem as described in the FAQ. What shall I do cleaning or driving or exchanging the O2?

Thanks in advance.
Thomas

 

[Larry Bastanza]

If the shop used WD40 to remove them from the old exhaust manifold this is not too good . You can try for sure driving it a while and see if they clear up.

Also do you have an engine check light?? I am wondering why if you do not. This would be a sure indicator of an 02 Sensor issue.

What year is the car? Earlier cars may not throw a code.

HTH,
LarryB

 

[goldNSX]

Also do you have an engine check light?? I am wondering why if you do not. This would be a sure indicator of an 02 Sensor issue.

What year is the car? Earlier cars may not throw a code.

HTH,
LarryB

The engine light came up three times on the same run. I stopped and restarted the engine. After a while it came back. Should I clean them with something or drive?

Also: a year ago I had the engine light coming up after starting the engine for 30 seconds, then didn't drove it for one week. After that on the first run I had the light, I stopped and restarted and it never came back. But this was a year ago. I think there was little contamination on the O2-sensors which cleared away.

The car is Nr. 635 of 1991. What color is the service connector? How to get the codes?

Thanks in advance,
Thomas

 

[Gerard van Santen]

Look in the service manual. You can download it here:

http://www.nsxprime.com/FAQ/Reference/1991_svcman/1991_svcman.htm

Look at page 11-18 for the connector and page 11-20 for the codes.

Gerard

 

[Barn Man]

When you say you pulled the throttle and it didn't respond are you talking about manually opening the throttle plate with your hand?
Definitely check the codes. You can do so with a piece of wire in the service check conector. (look in the manual).
Turn the key on after jumping the conectore and count the flashes. (again see the manual for description of flashes).
If the 02 sensors have been contaminated, there's a good chance you will have to replace them. The only thing that should be used on 02 sensors is anti seeze. This should only be used on the threads to make them more user friendly.
Definitely take it back to the shop and see what they find.
I'm almost wondering if it's possibly something on the 60k that caused the issue.
Barn

 

[RichJacobs]

Wireing harness

After installing the Taitec headers several weeks ago, I also had a "sputtering" issue. We found it to be the rather cheaply made O2 wiring harness provided by Taitec. Changed it out to the Comptech harness, and it worked fine.

 

[goldNSX]

Re: Wireing harness

After installing the Taitec headers several weeks ago, I also had a "sputtering" issue. We found it to be the rather cheaply made O2 wiring harness provided by Taitec. Changed it out to the Comptech harness, and it worked fine.

That's really good news! I called the shop on the same day as the sputtering occured and he told me that they had to put the wiring harness on another route maybe to near the engine. He thought he will check this first.
Did you have a problem with the isolation of the wiring? The Taitec wiring harness looks really cheap indeed.

Thank you very much for the help,
Thomas

 

[goldNSX]

When you say you pulled the throttle and it didn't respond are you talking about manually opening the throttle plate with your hand?
Barn

Hi Barn

I ment by pulling the thottle with my foot. It was like having no fuel or water or air in the tank. I think they've changed the fuel filter. Could there be a problem with air bubbles? The problem arose more frequently when the car stopped or moved slowly and the engine cabin was hot.

Thanks in advance,
Thomas

 

[Cees-Jan]

The only way to start solving this ,is by reading out the codes (see manual how).

If the garage used wd40 or simular on the O2 sensor it is broken...

So check your codes......

 

[Barn Man]

Hey,
The wire issue is more than likely the problem. I've heard of this before. I had a customer once that had a service done at their local dealer and the valves had been adjusted incorectly causing the car to run TERRIBLE. But this is more than likely not the issue. Take care of the wires and see if you still have any issues with the performance/running of the car.
Unless they have left a fuel line loose, the fuel filter is not the issue. And if they did leave a fuel line loose, you would know very quickly. The smell would be VERY evident.
Take care all,
Barn Man...

 

[goldNSX]

They told me that they haven't adjusted the valves as they did it 20000 km ago. The valves are ok.

I drove it today for about 20 miles without the problem. Maybe this was too short but the engine light came up twice so the problem still exists. I'll bring it back to the shop tomorrow. I'll let them change the wiring.

Greetings,
Thomas

 

[RichJacobs]

Taitec harness...

Bottom line is the Taitec harness is a POS. If you look at it closely the connectors are not even soldered, just "crimped." And there not even insulated. It's actually a shame the even sell it with them.

Just put the CT one on and I bet your issues dissappear.

And as other posts have stated, the bad harness may caue your mechanic to search for other issues like the O2 sensors... and by the time he takes the sensors in and out he is bound to screw one up, as they're quite sensative.

 

[Barn Man]

Rich,

What kind of mods are on the old surfboards?!
Barn Man...

 

[RichJacobs]

no mods...

Just a little wax... some 6'-8' swells... just as fun as bang'n thru the gears on the X !!!

 

[goldNSX]

Update: My garage fixed the problem today by soldering it. I told them about the cheap wiring harness of the Taitec. He already thought this would be the problem and luckily not the O2-sensors. The code reading said O2-sensors that was sure enough. I'll try it out on a long distance running. I'm very confident that the problem doesn't exist anymore. I'll report it in a week or two.
Many thanks to all advices!
For future Taitec buyers: Get another wiring or get the Taitec soldered will beware you of frustrating waiting for the cause.

Greetings,
Thomas

 

[goldNSX]

After a 150 miles test drive I didn't have any problems at all.
Only good news! Definitly stronger pull and very nice sound with the AIS
For future Taitec buyers: Get another wiring or get the Taitec soldered will beware you of frustrating waiting for the cause.

Greetings,
Thomas

 

[RichJacobs]

Frankly... shame on supplier...

Frankly I think at least if Taitec isn't going to fess up that their POS harness will cost each of us another 2 hours of "hunting down the problem" the resellers that sell their headers should AT LEAST warn us, or better yet, supply a decent workable harness.

I will not say where I bought my Taitec headers, but I WILL NOT buy from that guy again and would highly recommend that other "prime'rs" avoid this guy. He cost me an additional $120 in my mechanics time for him to figure out that is was Taitec's joke-of-a-harness. If he is a dealer of their stuf he should have know this.

I will also say that I found out after-the-fact that had I bought my Taitec headers from SoS they would have offered and sent me a suitable harness. As they are aware of this problem. Of course the guy I bought my headers from, proudly stated that he was $100 cheaper than SoS... only did I find out why later.. I had to buy a harness from SoS for $100, as my seller didn't "know of this problem". So once again, a deal is not always a deal!

I also ordered a set of "as good as brand new" set of B&B exhaust from the same guy. As he told me, "I just put them on my car to get a sound clip sample and took them right back off" (>200 miles on it and would save me $200)... well what did I get was but a badly dented and bent exhaust tip. Of course He claimed this "must have happened in shipping". I personally unpacked the exhaust and there was no way it happened in shipping as the tip was well wrapped and deep in the middle of the carton. So the $200 I saved on my B&B exhaust, I will now spend on trying to get ONE drivers side tip replaced. I have not even got this guy to help me get a new tip... he's got my money and now he's adios.

So all said and done, I spent $120 more than I would have had I gone thru a relaible source like SoS for my headers, not to mention the time and headache. And I have yet to find out if and how much it will cost to get a new tip for my B&B setup.

They (SoS and other reputable suppliers) may not always APPEAR to by the best price. But in fact may be in the long run. Be cautious of those who's only claim to fame is "best price". We all own a fine sports car and maybe this is one area where we are better off just realizing this when we buy and deal with after-market suppliers. Just maybe Speed is not Within Reach !!!

 

[goldNSX]

Re: Frankly... shame on supplier...

Frankly I think at least if Taitec isn't going to fess up that their POS harness will cost each of us another 2 hours of "hunting down the problem" the resellers that sell their headers should AT LEAST warn us, or better yet, supply a decent workable harness.

Full acknowledgement! Taitec MUST sell better wiring!!!

...not to mention the time and headache.

The headache was the most horrible thing! I started to read about it in the FAQ several times like I already did BEFORE I bought it and was horrified by a possible O2-sensor problem. I don't tell my supplier either as I don't want to judge him in the public. My garage made a fault too because they thought there MIGHT be a problem with the wiring. So why didn't they fix it the first time?
And at least: The FAQ didn't state any information about it.
SO QUOTE THE POSSIBLE TAITEC PROBLEM IN THE FAQ PLEASE!

As a very patient man after all I'm happy with the header.

Greetings,
Thomas