?'s about CAS

[Anand]

1) is Cam anfle sensor the same as Crank angle sensor??? I've heard it is but I don't know for sure (this is on the SR BTW)

2) would a bad CAS cause me to miss when I'm cruzing along at any speeds???

My SR runs absolutely perfect except for this one little issue, it runs fine when I punch it but when I am cruzing it misses and I have to press the gass and it will come back alive.

so one shop told me that my Crank angle sensor is bad which is causing it but I want to be sure and see if I can change it myself and save $$$ by not having the shop do it since they will charge me a lot of $$ to do it..

thanks

[SpeedRacer1]

CAS= Position of the cams, but some call it crank angle sensor, they refer to the same thing. Nissan calls it a camshaft position sensor but CAS sounds cooler than CPS.

I dont really see CAS's as a part that goes bad, if its bad the car probably wouldnt run at all. The CAS could cause the missing at high RPM's if the ignition timing is off though.

Another possibility is if you have a BOV. My BOV will release air if I come off the gas at 85+ MPH. So I can cruise at like 65 with the BOV and fluctuate the throttle, but if I am above 85 and release the throttle the boost is released, causing a semi bucking because its like stalling the engine at high speed. Then when I give it gas again the BOV closes and the car runs fine again.

[Anand]

hmmm.... so you don't think it is the CAS that's causing this??

IT's really weird... it doesn't matter what speed I am at thought.. I could be cruzing at 35 and the car sputters!?!? but once I step on it, it goes away... it's not enough to make a big difference but I don't want it there.. I want my engine to run smooth at all times...

I don't havea n after market BOV. I am running the stock sidemount with the stock BOV...

[SpeedRacer1]

Could be an issue with your idle air control valve that feeds extra air into the engine above what the throttle body feeds. If the car is running then the CAS is most likely fine, its the ignition timing that could be off. But if you want to see if the CAS is damages, take off the black cap and look to see if the CAS disc is bent.

[Anand]

cool.. thanks.... I had my car checked out by Autolink here in towna dn they are very good at what they do and that's what they told me is wrong with my car...

I'll take it off and see if the disk is bent. thanks for the help..

another thing is, do you think my BOV could be leaking??

[SpeedRacer1]

If its a stock recirc valve, its doubtful, though I did have one go out on me. But even if it was broken this wouldnt give the symptoms you are describing. Your car recirculates the air, mine bucked because it was venting to the atmosphere and the air the engine expected to be in the system simply was not there.

[Phax]

You can almost certainly rule out the CAS. That is an integral part of the engine. If it goes bad, the car will not run. My buddy had his 2002 Sentra go down on him when the CAS went out. It simply would not turn over. Nissan had to recall a bunch of cars because they all used the same model Hitachi CAS.

Do you have an FSM? There might be a procedure in there on how to test it. I have an FSM, but it's in Costa Mesa and it will be a few days before I'm in that part of the world again. You have an S14 motor, right?

[Hijacker]

some Cas's break down in a way to where the car will run, but poorly. From what anand was saying, it just sounds like his timing's off. i had a similar problem where i was misfiring while cruising and found out i was running like 3 or 4 degrees BTDC.

[Anand]

hmmm..... you guys gave me some good advise, I will just have to roll up my sleeves and check a few things out. I will check the timing and see if that helps...

I have a S13 Redtop in to my S14 chasis.... unfortunetly I do not have a FSM..

Pax, thankx for your help... I am not in that much of a hurry since my car does run and all, so when ever you get back to this part of the world, let me knwo and maybe I can come down and check it out??? if not, it's cool...

thanks everyone for your help!

[Phax]

My FSM is for the S14 SR20DET. I bought it though because there are many similarities between the motors. I'll check it out and see if there are any directions for testing the CAS. If there are, I bet they'll be applicable to the S13 too.

[Anand]

cool..thanks..