Surging Issues - Not Typical Cold Start - In Gear When Warm

[AK Bob]

Check the exhaust pressure sensor and tube for soot restriction.

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[Scully Motorsport]

Thank you, guys, for the quick reply.

I will start with the free suggestion, and then that actuator is not too expensive to try next.

There is no pressure on the low side when the truck is off, right?

I can pop that thing out, correct?

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[AK Bob]

Thank you, guys, for the quick reply.

I will start with the free suggestion, and then that actuator is not too expensive to try next.

There is no pressure on the low side when the truck is off, right?

I can pop that thing out, correct?

Correct, there is no pressure on the exhaust pressure sensor with the engine off.

Since the fuel rail pressure is commanded high and low when surging, I would start with that.

If there is no blockage, it could be a bad sensor.

You could also try the free WD40 test on the FCA to see if it’s sticking.

See the attached video.

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