CAS failures - How common are they??

[CA19DET]

when we first put together my engine the Crank Angle Sensor was fualty, i dont know if its because the haltech is sooo sensitive to ignition/timing signals that it was showing an error (cause it was working before) but it looks like i have another CAS failing on me...

the car revs under no load, but when it reached about 5000rpm or so the tach starts jumping all over the place...

under laod it does the same thing, but from about 3000rpm it backfires and doesn't rev... timing is all over the place... i am afraid of detonation so i am letting my tuner look at it.

thats one thing that sux about Stand alone EM, i can't do a diagnostics test to see if it is the CAS..

i pulled the plugs and they are all covered in soot/carbon showing that it is running rich .. no leaks in the interooler pipes...

cause the way the tach is reacting i think it is the CAS.. bloody thing

Anyone else have problems with CAS?? Boost_Boy i know you have allot of experience with CAS and Stand alones on CA's, any probs in the past??

[boost_boy]

Thes

when we first put together my engine the Crank Angle Sensor was fualty, i dont know if its because the haltech is sooo sensitive to ignition/timing signals that it was showing an error (cause it was working before) but it looks like i have another CAS failing on me...

the car revs under no load, but when it reached about 5000rpm or so the tach starts jumping all over the place...

under laod it does the same thing, but from about 3000rpm it backfires and doesn't rev... timing is all over the place... i am afraid of detonation so i am letting my tuner look at it.

thats one thing that sux about Stand alone EM, i can't do a diagnostics test to see if it is the CAS..

i pulled the plugs and they are all covered in soot/carbon showing that it is running rich .. no leaks in the interooler pipes...

cause the way the tach is reacting i think it is the CAS.. bloody thing

Anyone else have problems with CAS?? Boost_Boy i know you have allot of experience with CAS and Stand alones on CA's, any probs in the past??

These failures are common and as long you use a used unit, there's a big chance that it's possibly the CAS. I've seen problems with the haltec sensing nissan's crank angle sensors before, but then again I've seen have the same issues with Toyota as well. I would try one more CAS and then possibly switch to another trigger. Or better yet, totally check the harness's integrity to make sure nothing has been breeched. Hope this helps......

Dee

[CA19DET]

thanks D. i have already started checking the harness and have also swapped in another CAS, it didnt even start with the other one (looked more used than mine) oh well i got to look around... i was just wondering if this was just me mashing them up?

where can i get a new one from BTW?

thanks

[paul_s13]

I've had 2 fail on me, and many of my friends have had them die too,

[nismoplsr]

Make sure that the CAS wiring is still sheilded. You might be picking up some interference.

Also that problem seems alot like one that i had. But the problem was a loose engine ground. I would backfire/missifire under any kind of boost because of a poor spark. Also at idle the tach would jump all over the place. I then saw that my engine ground was loose and barely making a connection. I would check your grounds.

[CA19DET]

well i am thinking it is either the coil packs, plugs or wiring/ground.... it is doing the same thing here, as it hits boost, its not getting a clean spark, i rev it to about 3000rpm under no load, and you can see the rps fluctuating,a nd as you give it more gas, it fluctuates more...

under laod it is tessible.. i pulled my plugs and they all look good, i am thinking it is a ground or interference... (maybe coil pack) but is not one cylinder from the feel of it, it seems the entire ignition circuit is breaking up/shorting...

thanks guys.. i'll get my friend wiht the multimeter to come over and check some shizzle out.

[paul_s13]

Check the splines on the CAS and exhaust cam, if these are worn you have no chance of timing it right

[CA19DET]

well the exhaust cam is BRAND new TOMEI unit so i doubt that side is worn, BUT the CAS does have a little grub that i want to clean out with some electrical cleaner...

my tuner returns tom from texas, so i'll know between then and friday (i hope we can sort it, there is National Drags this weekend and i would love to enter)