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DavyG

Member Since: 23 Jun 2019
Location: Ireland
Posts: 10

Puma 2.4 hesitating & cutting out.

Hi folks,
Was out yesterday and noticed a slight hesitation when going up the gears. Once in 6th, it was struggling to hit 70mph. Stopped & checked all fluid levels and nothing obvious was hanging off. Over the next 30 mins of pottering about the hesitation got worse. The engine would just splutter under any acceleration. Got home (just about) and checked everything again. Filters are all good (serviced 300 miles ago).
Started up and the engine idled for just over 2 mins then cut out. Started up again...same thing. Started again, drove up the road, ran fine through 1st & 2nd but that was it. Into 3rd and it just spluttered and died. Started up again, limped home and that's that.
The engine was remapped a couple of years ago with the egr disabled.
Has anyone come across this before....it has me stumped.
Regards,
DG

23rd Jun 2019 6:14am

Diffy

Member Since: 04 Oct 2015
Location: Taunton
Posts: 6

2009 Defender 110 Puma 2.4 XS CSW Corris Grey

I had very similar symptoms- was water in fuel filter from perished tank breather hose - and from this a knackered VCV

23rd Jun 2019 6:52am

williamthedog

Member Since: 29 Dec 2012
Location: south wales
Posts: 3441

As said above, try changing the vcv valve. Easy enough to do. You're supposed to do a pump relearn after changing but they'll run fine without doing.

23rd Jun 2019 7:12am

DavyG

Member Since: 23 Jun 2019
Location: Ireland
Posts: 10

Cheers guys...I've been doing a lot of "googling" this morning both on the puma and transit forums. It seems that it could be a faulty VCV, SCV or PRV or a combination of all three. Some advise to replace all 3, as they do and will fail at some point.
Again....any advice is welcome.
Regards,
DG

23rd Jun 2019 8:39am

custom90

Member Since: 21 Jan 2010
Location: South West, England.
Posts: 20376

You should be okay with changing VCV only. Mine needs doing really. And fuel tank breathers as suggested. Hoping the latter isn’t an overly expensive job to get done. $W33T $0U7H3RN $UG4R
🇬🇧🏴󠁧󠁢󠁥󠁮󠁧󠁿🏴󠁧󠁢󠁷󠁬󠁳󠁿🏴󠁧󠁢󠁳󠁣󠁴󠁿🇮🇪🇺🇸⛽️🛢️⚙️🧰💪

23rd Jun 2019 10:20am

DavyG

Member Since: 23 Jun 2019
Location: Ireland
Posts: 10

Quick update...
Dropped the fuel tank today

not that pleasant a job, but had to start somewhere!!! A bit of sludge in the pick up pot, but nothing overly excessive. I did notice what seemed to be tiny pieces of red plastic about 0.5 mm thick. No metal at all. Any ideas where they are from? Changed the fuel filter also. Started up and ran for 2 mins on a smooth idle. Just before it cut out, there was a slight increase in rpm before it cut out. VCV and PRV on order, should be here in the morning.

24th Jun 2019 4:47pm

HardCharger

Member Since: 03 Mar 2013
Location: Manila
Posts: 737

2011 Defender 110 Puma 2.4 SW Stornoway Grey

Clean and dry out the tank before re-fitting and re-filling. You've already changed out the fuel filter, so that's good. Check that the fuel filter is seated properly and wobbling when tightly fitted.

Changing the VCV is good since you said you had sludge in the tank. You'll have to do the pilot correction and pump re-learn after you replace the VCV to ensure smoother operation.

Since you already have the PRV, I guess it couldn't hurt to replace it as well if it was suspect.

25th Jun 2019 1:31am

custom90

Member Since: 21 Jan 2010
Location: South West, England.
Posts: 20376

I thought you could change the VCV without relearn and eventually it will do it, it’s self. $W33T $0U7H3RN $UG4R
🇬🇧🏴󠁧󠁢󠁥󠁮󠁧󠁿🏴󠁧󠁢󠁷󠁬󠁳󠁿🏴󠁧󠁢󠁳󠁣󠁴󠁿🇮🇪🇺🇸⛽️🛢️⚙️🧰💪

25th Jun 2019 3:02pm

Swollock

Member Since: 16 Mar 2013
Location: Wellingborough Northants
Posts: 262

2008 Defender 110 Puma 2.4 XS CSW Bonatti Grey

Always worth unplugging the MAF sensor, I had all kinds of issues with cutting out, unplugging it will cause it to just run default values. On mine it stopped all the issues, then I just fitted a replacement and no more problems.

I was not getting any lights or alarms or codes. Just cutting out and poor running. 2008 Defender 110 XS CSW
Volvo S60 T8
Triumph 1200 Rally Explorer
G0UBX

25th Jun 2019 3:48pm

DavyG

Member Since: 23 Jun 2019
Location: Ireland
Posts: 10

Today’s latest...
VCV (SCV) & PRV FITTED. Now ticking over perfectly but still hesitating and losing all power when driven. Would an ECU re-learn be the problem now?
Slowly losing the will to live....

Regards,
DG

25th Jun 2019 5:54pm

Tomotomo

Member Since: 13 Feb 2018
Location: Bucks
Posts: 71

Did it carry out the full 're learn without problem?
Mine did what you describe, there was still some air in fuel line.
Have you checked drain screw and filter properly on.

25th Jun 2019 6:56pm

DavyG

Member Since: 23 Jun 2019
Location: Ireland
Posts: 10

I haven't had it plugged in to diagnostics yet....I thought it would have ran ok without much issue.

25th Jun 2019 10:44pm

HardCharger

Member Since: 03 Mar 2013
Location: Manila
Posts: 737

custom90steve wrote:
I thought you could change the VCV without relearn and eventually it will do it, it’s self.

You could, but things would be smooth sailing quicker if you could do the relearn after replacing the VCV.

Since he's still experiencing cut off issues, having the OBD scan tool plugged in can help him monitor the values to see if there is anything else he should be checking.

26th Jun 2019 2:08am

custom90

Member Since: 21 Jan 2010
Location: South West, England.
Posts: 20376

👍🏻 $W33T $0U7H3RN $UG4R
🇬🇧🏴󠁧󠁢󠁥󠁮󠁧󠁿🏴󠁧󠁢󠁷󠁬󠁳󠁿🏴󠁧󠁢󠁳󠁣󠁴󠁿🇮🇪🇺🇸⛽️🛢️⚙️🧰💪

26th Jun 2019 3:42pm

DavyG

Member Since: 23 Jun 2019
Location: Ireland
Posts: 10

The latest...PCM re-learn completed. No faults stored or showing. Now idling without cutting out. Still a very bad hesitation while driving, with a loss of power. Unplugged the MAP sensor and took it for a drive...loss of power. Disconnected the MAF sensor...made no difference.
Any ideas...?
Regards,
DG

28th Jun 2019 7:00am

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