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WestCountryPete



Member Since: 30 Sep 2023
Location: Wiltshire
Posts: 41
United Kingdom 2011 Defender 110 Puma 2.4 USW Orkney Grey
1100/1200 RPM power hesitation
After doing a good chunk of miles over the weekend (roughly 450), mixed motorway, A and backroads, my 110 drove without fault (ignoring drivetrain slack that I need to sort!!). Got home and popped out and noticed some hesitation at around 1100/1200 RPM. Went out again tonight to do some testing and it’s 100% there, hesitating for 1/2 seconds then suddenly picking up.

It doesn’t happen every time and can only notice it in 1st and 2nd gear. Can’t work it out at all! It’s like it’s just killing the power, but not enough to stall. Power after that is all good and pulls as normal.

Any ideas? Could it be my time to replace the VCV? From what I’ve read that has slightly different symptoms.

It’s a 2011 2.4 utility. Just about to order an ODB reader to see if it’s flagging anything, but no engine management light coming on.

Thanks in advance. Hoping I can nail/fix this before travelling France!
Post #1035933 28th May 2024 6:56pm
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WestCountryPete



Member Since: 30 Sep 2023
Location: Wiltshire
Posts: 41
United Kingdom 2011 Defender 110 Puma 2.4 USW Orkney Grey
Should have added. Engine temp doesn’t appear to make a difference to the behaviour.
Post #1035945 28th May 2024 9:16pm
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jbcollier



Member Since: 29 Apr 2024
Location: Edmonton AB
Posts: 92
Canada 2009 Defender 110 Puma 2.4 SW Alpine White
Definitely pull codes first. The warning light does not come on for every code.
Post #1035951 29th May 2024 4:22am
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blackwolf



Member Since: 03 Nov 2009
Location: South West England
Posts: 17391
United Kingdom 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey
As above, check for codes first. If there are no codes it could very well be a VCV issue.
Post #1035973 29th May 2024 8:52am
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WestCountryBob



Member Since: 04 Jul 2023
Location: West Country
Posts: 10
United Kingdom 2011 Defender 110 Puma 2.4 USW Stornoway Grey
Thanks for the replies.

Just ran some diagnostics with an OBDLink MX+ and their OBDLink app - no fault codes returned! Can’t decide if that’s good news or bad! Rolling Eyes

I was kind of hoping it would be the MAF sensor or another 5 minute job. I then ran ‘CarScanner’ which returned:


Click image to enlarge

Third app (FORScan Viewer) also returned no errors. So I’m baffled now!
Post #1036042 29th May 2024 9:12pm
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jbcollier



Member Since: 29 Apr 2024
Location: Edmonton AB
Posts: 92
Canada 2009 Defender 110 Puma 2.4 SW Alpine White
I'm a retired 35 year mechanic but I not an expert on Puma injection. Myself, I would check your battery connections and ground connections (as many as you can find), clear the codes, and try again. Reasoning? The fact "everything" was having trouble communicating leads me to think there's probably a common cause. The most common connection issue is grounds.
Post #1036052 30th May 2024 1:37am
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andy63



Member Since: 30 Jun 2023
Location: north east
Posts: 516
United Kingdom 
Those are old archived codes and not likely to be relevant to your current issue.. More likely from previous work and having something disconnected.. As said make a note and clear.. If the same return then you will know one way or other
If you could run your truck while watching live values, Fuel rail pressure would be a good one to start with.. 👍
Post #1036055 30th May 2024 5:23am
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WestCountryBob



Member Since: 04 Jul 2023
Location: West Country
Posts: 10
United Kingdom 2011 Defender 110 Puma 2.4 USW Stornoway Grey
Thanks all for the info. I’ll get some live data when I’m next out and feedback here.
Post #1036065 30th May 2024 8:02am
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WestCountryBob



Member Since: 04 Jul 2023
Location: West Country
Posts: 10
United Kingdom 2011 Defender 110 Puma 2.4 USW Stornoway Grey
Live diagnostics in hand, I went out for a drive today. Made sure I did plenty of stopping and starting. Did it misbehave? No, of course not Rolling Eyes

I’ve cleaned the MAP sensor as that was coated so let’s see how it behaves.
Post #1036260 1st Jun 2024 8:40pm
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