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LandyMarmy

Member Since: 02 Jul 2023
Location: Yorkshire
Posts: 6

2011 Defender 90 Puma 2.4 XS CSW Santorini Black

Defender hesitating / surging under load

Hi, New to the site and Martin gave me a few pointers to use it correctly, thank you Martin.
My 2011 90 2.4 has had a re map, a larger Allisport intercooler and 3" exhaust a few years ago. It's running great apart from it hesitates when put under load a couple of times then settles down until changing up a gear when it does it again. I've changed the MAF sensor, but no different. :blub: Any ideas, turbo sticking perhaps?
Any help would be appreciated. Thanks.

4th Jul 2023 10:22am

blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 17887

2007 Defender 110 Puma 2.4 DCPU Stornoway Grey

Check for DTCs, if none, replace the VCV.

4th Jul 2023 11:04am

LandyMarmy

Member Since: 02 Jul 2023
Location: Yorkshire
Posts: 6

Thanks for the quick reply. I'm OK with spanners, but no engine mechanic so could you please explain what CTC's are and what the VCV is. Thanks..

4th Jul 2023 11:19am

LandyMarmy

Member Since: 02 Jul 2023
Location: Yorkshire
Posts: 6

Read up on it, Diagnostic Trouble Code and Fuel Vapour Valve. I'll try those thanks..

4th Jul 2023 11:31am

Ianh

Member Since: 17 Sep 2018
Location: Essex
Posts: 2434

DTC = Diagnostic Trouble Code. You have an OBD2 port in the fuse box under the steering wheel. You connect a diagnostic tool to that port to read DTC’s . These codes are an alpha numeric format and each one points to a specific test that has not performed as it should and therefore a single DTC or combination of DTCs allows you to localise an issue with the engine, sensors, brakes etc.

Cheap ELM327 code readers coupled with a free phone app such as torque will allow you to read the codes, look them up on the internet or post on here and we can advise on what you issue probably is.

As Blackwolf states, the lack of any DTCs and the issue you have would point towards a VCV ( fuel volume control valve) issue, which is very common on the 2.4.

4th Jul 2023 11:44am

LandyMarmy

Member Since: 02 Jul 2023
Location: Yorkshire
Posts: 6

Thank you for that. I have a code reader knocking about somewhere, ill dig it out and check. No engine lights on at present, but something might come up. If the VCV is a common fault then I'll get my local to change it and report the findings. Cheers.

4th Jul 2023 11:59am

Ianh

Member Since: 17 Sep 2018
Location: Essex
Posts: 2434

If you are ok with spanner’s, and Allen keys then the VCV changeout s not technically difficult, just awkward due to restrictive access.

The key thing is to get a Genuine Denso VCV from a very reputable supplier as lots of fakes out there that just don’t work or fail very quickly.

See bell auto services site for instructions. Ps most don’t do a pump learn or pilot correction with diagnostics tools and all runs well after a few miles driving.

https://bellautoservices.co.uk/store/defen...our-valve/

4th Jul 2023 1:55pm

LandyMarmy

Member Since: 02 Jul 2023
Location: Yorkshire
Posts: 6

That's a good sight thanks and it seems easy enough to do. I tried to order one from Bell, but they are out of stock so I'll try and get a quality one elsewhere. Thanks for the advice and wish me luck. I'll let you know the result

4th Jul 2023 3:08pm

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