CA18det Problems. Please Help!

[float_6969]

It's not a cleaning issue. The issue is with the internal electronics. I suppose if you're REALLY good with electronics, you could tear it apart and try to replace the transmitters, receivers and diodes inside the unit and see if that fixes it.

If you want the technical response, here is the issue when they fail. There are 3 infrared emitters inside the unit, all placed on one side of a disk with multiple slits in it. These slits in the disk correlate to various information about the position of the cam. On the other side of the disk are infrared receivers. So, when powered up, the emitters "illuminate" (it's infrared, so you can't see it). When the disk turns to a point where a slit is, the emitters signal passes through the opening to the receiver. The receiver then outputs a voltage.

But there is an issue in that the signals from these receivers are in a sine wave form. The ECU needs a square wave. So within the CAS is also a little bit of circuitry that converts these 3 sine waves into square waves, which are then outputted to the ECU as 3 separate signal a about the position of the camshaft (which is then used to make assumptions about the position of the crankshaft as well).

Obviously, there is a lot that can go wrong here. Although I've never tested a faulty unit, I would be willing to bet that the issue that causes them to fail is a problem with either an emitter or a receiver. If a failure occurred in the wave form circuit (the part that converts the sine waves to square waves) the ECU would pick this up and log a fault code.

Be cautious with used units though. This is not an uncommon issue and the used unit should only be purchased if it can be guaranteed to be in good working order.

[boost_boy]

Four areas of concern here! Could you please provide us a photo of your front timing cover area as it presently sits. Next area is the oxygen sensor and its circuirtry. It needs to be connected and with a functioning sensor. Next area is the AFM circuitry. Remember, it is an aftermarket harness, so you'll never know until you check it. Last, is the ECU. It could just very well be toasted. Just because it reads 55, doesn't mean it's not damaged. It's probably so banged-up that it can't monitor critical sensors, thus causing it to read like everything is normal. Oh, and did I mention the harness could be faulty too? You have a mess on your hands

[AustinHarbour601]

Well it's a brand new wiring specialties harness, replaced MAF with KA24e one, so I'm thinking CAS or ECU