2005 kenworth c15 acert in a 2006 western star - wont rev past 1500 rpms

White hall · Aug 22, 2019

uncle jack said: ↑

I got the problem fixed guys. Here is what happened. After trying to get the problem fixed with a regular truck mechanic, i got nowhere and decided to take the truck to caterpillar. The first thing they told me, was that i had to reprogram my computer to match the bsx engine. That cost about $350. The computer was still giving a speed sensor error, even after we changed both speed sensors. After this, i took the truck for a test drive but noticed it still would not rev past 1500 rpm and there was no torque. I took it back to caterpillar and the mechanic started to disconnect each sensor to see if the computer registered an error code while the engine was running. When we disconnected the boost pressure sensor, we noticed that no error code was generated and we also noticed that the boost pressor sensor appeared to be damaged after we removed it. We replaced the boost pressure sensor and then we noticed that the speed sensor error cleared immediately and wa la! The truck reved up to rpm limit. Apparently the boost pressure sensor failure caused the speed sensor readings to make no sense to the computer, which generated the error code. Why didnt the computer also generate a boost pressure sensor error code? I have no idea. But the problem is solved. Nuff thanks to everyone who provided insight on this. Hopefully this can help someone else in the future.
Uncle jack
Click to expand...

White hall · Aug 22, 2019

uncle jack said: ↑

I got the problem fixed guys. Here is what happened. After trying to get the problem fixed with a regular truck mechanic, i got nowhere and decided to take the truck to caterpillar. The first thing they told me, was that i had to reprogram my computer to match the bsx engine. That cost about $350. The computer was still giving a speed sensor error, even after we changed both speed sensors. After this, i took the truck for a test drive but noticed it still would not rev past 1500 rpm and there was no torque. I took it back to caterpillar and the mechanic started to disconnect each sensor to see if the computer registered an error code while the engine was running. When we disconnected the boost pressure sensor, we noticed that no error code was generated and we also noticed that the boost pressor sensor appeared to be damaged after we removed it. We replaced the boost pressure sensor and then we noticed that the speed sensor error cleared immediately and wa la! The truck reved up to rpm limit. Apparently the boost pressure sensor failure caused the speed sensor readings to make no sense to the computer, which generated the error code. Why didnt the computer also generate a boost pressure sensor error code? I have no idea. But the problem is solved. Nuff thanks to everyone who provided insight on this. Hopefully this can help someone else in the future.
Uncle jack
Click to expand...

Do you have a picture of the sensor that way I know they are giving me the right one I'm having the same issues on my c13 check engine light will start flashing at 1500 rpm

RustyBolt · Aug 22, 2019

White hall said: ↑

Do you have a picture of the sensor that way I know they are giving me the right one I'm having the same issues on my c13 check engine light will start flashing at 1500 rpm
Click to expand...

Uncle Jack made 3 posts in this thread 5 years ago and hasn't been back.

Doubt he will be sending you any pics. May want to start a new thread.

Wheeljack · Sep 16, 2019

RustyBolt said: ↑

Uncle Jack made 3 posts in this thread 5 years ago and hasn't been back.

Doubt he will be sending you any pics. May want to start a new thread.
Click to expand...

It was sure nice of him to come back and tell us what the problem was and the fix in this thread.

I notice many times where a person disappears and never know how they fixed their problems and just leaves everybody hanging.

AModelCat · Sep 16, 2019

Wheeljack said: ↑

It was sure nice of him to come back and tell us what the problem was and the fix in this thread.

I notice many times where a person disappears and never know how they fixed their problems and just leaves everybody hanging.
Click to expand...

Its definitely annoying. They get their free advice and then don't bother to share the fix. Some of us using this site are mechanics and we read this stuff to make ourselves smartener.

Wheeljack · Sep 16, 2019

AModelCat said: ↑

Its definitely annoying. They get their free advice and then don't bother to share the fix. Some of us using this this site are mechanics and we read this stuff to make ourselves smartener.
Click to expand...

I've noticed that some come on here that are mechanics and take time out of their busy day to help others. Thank you guys for that it's much appreciated.

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