Driving home today and the car stalls after 2K RPM. Engine light comes on and its Code 335 - crankshaft position circuit malfunction. So... I look under the hood and the crankshaft position sensor harness was unplugged. So I plug it back in and the problem still persists (even after many ECU resets). I am going to take the sensor out... but this is puzzling. Car won't go over 2K RPM.

The flywheel has those metal things for the crankshaft sensor pickup - if one or more of those turned somehow... its a problem, but I don't see that happening.

Any ideas?

Could the pickup go bad all of a sudden??!!??

 

Okay... I removed the flywheel cover under the tranny and noticed some scratches on the flywheel metal thingies used by the crankshaft position sensor. It appears that with some kind of expansion or something... it has EATEN AWAY at the crankshaft position sensor....

I will be informing Comptech immediately of this... this is ridiculous!!!

 

ouch.

so it has nothing to do w/ the install, the part is somehow defective?

 

Here's what I wrote Shad:

Shad.

I am greatly concerned right now. I removed the flywheel cover (under the tranny) and saw indentations on
the aluminum extrusions (used for the crankshaft position sensor pickup). There was also some scratches inside
the transmission housing. By this time I knew what is going on... I pulled out the crankshaft position sensor and
it is eaten away!! I am attaching pictures.

This has happened for the following reasons:

(1) The metal pieces screwed onto the flywheel are sitting too high and hence touch the crankshaft position sensor which
has been eaten away slowly

OR

(2) You did not calculate the thermal expansion of the flywheel when designing those pieces and hence this happens when
the flywheel is hot

This is absolutely ridiculous!! My car is not driveable and I am terribly upset. I know Steve Calbert of Atlanta
Georgia has had some product issues with you guys (the FMU to be exact). I hope Comptech is not compromising
its quality!! I have posted this issue at the www.acura-cl.com site where I am a very senior and respected contributor.

Here is what I want from Comptech USA:

(1) Acknowledgement of the problem
* There is NO WAY this is an installation issue. The flywheel bolts onto the crankshaft ONLY ONE WAY... if the crankshaft position sensor is hitting the flywheel, its a design issue!!
(2) Rental car while my car is being repaired
(3) New flywheel and clutch installed along with new crankshaft position sensor
* I live in Southern California by the way

If you are not willing to repair my car on-site. I will be forwarding all repair receipts for reimbursement.

 

Oh yeah.. the fucking part is defective!! The crankshaft position sensor is eaten away!! The flywheel bolts on ONLY ONE WAY... there is no reason for it to touch the CPS pickup.

 

All of you with the flywheel... take the CPS sensor out and look at it carefully.

 

Damn.... I can't believe this.... that is crazy.... I will notify Eric (TYPES1967) tomorrow... As of date, you and him are the only ones I know that have the lightweight flywheel and clutch assembly...

I feel for you Allmotor, I was about to make the purchase..

hmmmm a design flaw?.... Please keep us posted...

Good luck

Smitty

 

Here's a picture of the CPS assembly:

http://f1.pg.photos.yahoo.com/bc/gun...c=ph%26.view=t

 

Now there are pieces of metal flying around my transmission!!

I think I might sue Comptech for this.

 

Fuck... now the car isn't driveable. I can't just put another CPS sensor on there as it will get eaten up as well. Now I have to freaking put the stock flywheel back on - shit!!

 

Sorry to hear about that man. I hope everything turns out alright.

 

Holy shit that sucks to hear!!! Do you think Comptech rushed the release time for this product?? And can you tell me if the crankshaft position sensor is a common thing for all manual cars? (First time hears about this kind of problem) Because I'm about to take my S2K for a transmission TSB, and I have Toda flywheel upgrade, should I have them check this part also?

Thanks, and good luck Allmotor!!! You don't deserve this sh*t..

 

sucks when this stuff happens, give comptech a chance to make it right before flying off the handle at them.

Ya, I know I'd be just as pissed if I were you...


Good luck, I'll be interested to read your follow-up.

 

I was pretty stern with Comptech... but obviously did not mention anything such as a lawsuit or anything... its not the time for that right now. I will wait and see what their reply is. The flywheel is a great product... except for this flaw - now it could just be a one-time error on my particular piece!

Different cars have different CPS pickups... this one uses the flywheel.

 

have they gotten back to you yet

 

ill have to chk it but have over 5000 miles on clutch and no problems

 

Wow, Ramanan, that sucks...

I would definitlely give them a chance to make right on it, they ended up getting back with me and were responsive in the matter at that point on.

A Hall Effect sensor will take some abuse but not wear. Can you shim a new sensor to give it a little more room?? That might be enough to get you back on the road until Comptech can get you replacement parts.

Thermal expansion could be an issue but maybe the sensor was installed slightly off from the factory?? Here is a long shot, is there any play in the crank??

 

Hey Steve. I am definately not as irate as I was late night... I think I was a little overboard - much calmer now.

To think of it... I don't think its thermal expansion... its not possible. I considered play on the crank... but that would mean my main bearings are gone and that signals very BIG problems, which I doubt at this time. If the crank is warped, that would be causing other issues as well. I am also trying to see if I did something during the installation... but I remember removing the CPS before putting the tranny back on.

My thoughts exactly on shimming a new sensor... I will continue to use the broken shroud and pull the sensor out 2-3mm - should do the trick. I suppose all the little pieces have found their 'home' inside my transmission housing I don't know the tolerance (or sensitivity) of the sensor (how far it can be moved before it doesn't function).

Bummer

 

You should be safe at about 2mm for these types of Hall Effect sensors. Since they are providing pulses, the trigger threshold is usually fairly generous. I'm sure you'll find out if it is too far.

 

Comptech update:

I spoke to Bob of Comptech and they are doing the following:

(1) Took the tranny off their CL-S 6spd
(2) Get another car from the dealer to remove ITS tranny
(3) Put the flywheel in the oven and heat it up
(4) Get their CAD guys on it

Supposedly their 'test-car' which they designed the flywheel on does not have this shroud covering the CPS pickup while mine has a shroud (metal covering)... so that's one thing so far. They also considered the 2mm shim... and will get back to me. I have already ordered the CPS sensor ($101) and will have it by Friday.

It's a good start so far at least.

 

Worst case its going to fire the injectors on the exhaust cycle

 

Another update from Comptech:

They had designed the flywheel based on a pre-production 6spd and the production 6spds have a different CPS sensor and shroud - voila!

So... they are making me an adaptor with a new sensor as a fix. They are also contacting all the owners of the flywheel and sending them the adaptor as well (or even the sensor if their sensors are broken).

It's a combination of thermal expansion and tolerance plus the fact that I run my car right upto 7400RPM.

Well... it should be running again by Friday. I will get it in writing from Comptech that they acknowledge the design issue and are fixing it... BUT there might be damage which could show up later on - I don't know.

 

wow that's a MAJOR FAWK UP! Hope they cover any long terms damages....should there be any....

 

could it be those fly wheel bolts they were waiting on??????????????????

 

damn, not like I have a 6 speed, but good info none-the-less.

 

Not the flywheel bolts... the sensor is different from the pre-production CL-S 6sds that Comptech did the prototyping on... hence the problem.

They have been quite helpful... so I am not that pissed. They are sending me the sensor ($100) and a shim to increase the tolerance - hope that works.

However, I want them to put in writing that they acknowledge the design flaw and that there was damage caused to my car.

 

sounds like they may of already known about the problem


good to see them jumping on the gun and getting it fixed

 

No... they didn't know of the problem - I diagnosed it last night and they verified it. However, neither of us knew the issue with the change in CPS design from the pre-production cars to the production cars!!

 

HOLY CRAP, I am late into this one but this is the biggest piece of news I have heard here to date! I am glad I held off on my flywheel purchase. I think they owe you something for contracting out and finding their problems, more than just a fix. I'm sure you will work something out. So is Comptech's plan to ship the adaptor with new flywheels or fix the design? It sure better not raise the price of one. Any chance at all the UR crank pulley had anything to do with it? Bearing wear... increased runout, *smack*?

 

I don't think the UR's had anything to do with it. If the bearings are gone... I'll be having major engine problems The car runs great otherwise.. so its just the flywheel. For the crank to move enough to get the flywheel to touch the CPS... that's a LOT of movement!!

They will be shipping the adaptor with the flywheels for now. Anyways... we'll see if that works. I will be checking the CPS every week from now onwards

 

thanx allmotor ill call comptech today!!!!!!!!!!!!!!! shit i better chk the cps.im glad that you called them allmotor why the hell did they miss that!!! im pissed

 

Maybe it doesn't affect your car!! The tolerances might be so tight that you have to really push the motor to close that little gap

 

ugh this doesn't give me any confidence at all...........

 

It will be fixed... so as long as there is no permanent or any case for 'infant mortality' here... I don't mind. I'll call them in a few hours and see what is going on.