Construction and Road Equipment
Construction and Road Equipment repair questions? Ask a mechanic ASAP
Thanks for asking your question. I will try and help you out.
There are several things I have seen cause a C15 to surge like this.
The first is a fluctuating fuel pressure. If it fluctuates below 70 psi and back. It can cause this.
Second is a faulty cam or crank sensor signal. This can be caused by a faulty sensor or harness.
And lastly is a faulty injector. To determine which injector it is you would need to use Cat ET to cut out each one until the surge stops. When it stops that's the injector that's faulty.
Please reply back if you need more help or have more questions. I am happy to assist.
Thanks for the information.
If there is smoke then I would suspect a cylinder problem. It could be an injector or an Iva housing sticking holding open an intake valve.
I would have someone ride with Cat ET to cut out each injector when this is happening.
From experience I find a faulty Iva housing most often.
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