PX Ranger revving up and down while driving

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The Pariah
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Posts: 4
Joined: Tue Mar 18, 2014 8:07 pm

PX Ranger revving up and down while driving

Post by The Pariah »

Hi have a 2013 Ranger with no fault codes and everything is running fine - except it revs up and down constantly while driving - pls see clip https://youtu.be/4HH8d_t1ywI
Once you settle at a cruising speed it starts. It stops over 2000 rpm. Idling is fine, accelerating is fine. Starts & runs well.190,000km
MAF and MAP sensors are clean. Have read it could be EGR or SCV. Ford dealer says they have no idea where to start and I can see this costing a ton as they work through it crossing things off the list.
I have combed forums looking for exact same problem but no luck. Thought I should ask if anyone has had this exact same problem? before I let the dealership go HAM on it.
Any input welcome
Trublu
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Joined: Thu Oct 24, 2013 12:54 am
Location: Melbourne

Re: PX Ranger revving up and down while driving

Post by Trublu »

Do you actually here the engine altering revs or is just tacho fluctuating?

Possible causes could be vacuum leak, fuel delivery problems such as pressure, regulation, fuel pump, filters or injectors etc.
The Pariah
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Posts: 4
Joined: Tue Mar 18, 2014 8:07 pm

Re: PX Ranger revving up and down while driving

Post by The Pariah »

Thanks for the reply, Sorry didn't mention that the revs of the engine are rising up and down in synch with the tacho
george87
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Joined: Tue Feb 07, 2012 12:23 am
Location: Brisbane QLD

Re: PX Ranger revving up and down while driving

Post by george87 »

Take it to a diesel specialist and get your fuel pump tested and fuel filter inspected for metal filings.


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The Pariah
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Posts: 4
Joined: Tue Mar 18, 2014 8:07 pm

Re: PX Ranger revving up and down while driving

Post by The Pariah »

Thanks George hadn't considered that option
The Pariah
Member
Posts: 4
Joined: Tue Mar 18, 2014 8:07 pm

Re: PX Ranger revving up and down while driving

Post by The Pariah »

Just an up date for anyone who is interested
Problem solved - the auto transmission fluid was totally shot, completely cooked, the transmission cooler bypass valve needed replacing, probably a looong time ago by the state of the trans fluid.
Also they cleaned the EGR - absolutely filthy, completely choked up - something I knew should be done but never got around to it.
Cheers
2013fordranger2013
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Posts: 1
Joined: Wed Dec 30, 2020 3:29 am

Re: PX Ranger revving up and down while driving

Post by 2013fordranger2013 »

Hey mate did you find it only did this when warmed up ? Having the same issue so hope it's an easy fix with a service and new bypass valve
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