Cam Position Sensor

[JCRowan]

I have a 91 NSX and I just took it in for service and was told that a code in the computer was stating that I have a cam position sensor problem. Anyone have an idea of how complex a job that is to get replaced? It was also mwntioned that I have the old style of water pump. What is the benefit of switching?

Thanks - You guys are the best! I am a new owner who is mechanically challenged.

 

[Briank]

If you have a 91 with the old style water pump you are over way over due for a timing belt and change. Timing belt service interval is 6 years or 90 thou mi. The water pump is normally done also just because every thing is apart. The crank angle sensor part cost is about $170 and should only add about am hour of labor to the t-belt and water pump price. My guess is you are looking at $1500 - $1800 by the time you get done.

Do a search here for "timing belt" and check the FAQ's for lots more info.

 

[JCRowan]

Thanks Brian,

It is my understanding that the timing belt has been done, but the water pump was left alone. Should I change it when the sensor get replaced? If the timing belt has been done, does that change the cost of the repair from your previous estimate?

Thanks

 

[Briank]

It's very strange to have the timing belt done and have not had the water pump changed. Do you have proof that the t-belt was done? If the belt was done at 7-8 years them it may be time to do it again. To change the Crank angle sensor its will be the about the same cost as a t-belt change.

 

[ak]

Did you happen to wash your engine bay or get water in there lately?

 

[JCRowan]

On Water in Engine Bay

Nope, no water in the engine bay as far as I know. I just purchased this 91 NSX and on the drive home was when I noticed the problem. I took it into a recommended NSX tech and this is what he mentioned. He said, it looks as thought the timing chain was done, but he couldn't fiure out why it still has the old style water pump. He them got into the computer and that's when he mentioned that the code (59, I think) was in the computer and that is for the cam sensor.

 

[Briank]

The Crank/cylinder sensor very seldom fails. Code 59 is for Cyl B sensor of the 4 sensors that make up that unit. The 8 pin connector for the sensor assembly is located by the rear of the alternator and can be unplugged and checked with a ohm meter. Should read 650 to 850 ohm. I would not assume it is bad just from the code. AJ's thought of water in the engine bay causing a problem is good. A through check and reseating of the connector could save you lots of money.

 

[ak]

I agree with Bryan. I'd check the resistance. It may be as simple as just disconnecting and reconnecting the connector.