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garryc

Member Since: 12 Jan 2017
Location: Durban
Posts: 6

Puma 2.4 power lag

Ok guys my first post here I need some guidance as I have a problem with my 130 defender puma 2.4 it has 240000km on the clock. It has a few problems with diff needs to be reconditioned, transfer case also needs and overhaul but my current concern is that when I pull away it has no guts bellow 2000 rpm after 2000 she pulls well but as a result to keep momentum I am having to rev it to 3500 before changing gears otherwise power drops and lose momentum.

I have a 2.4 110 sw with 80000km and it does not exhibit this problem. It pulls well throughout the rev range and I don't have to over rev it to keep it going.

The other concern on the 130 is that between 1700 and 2000 rpm there seems to be a slight knocking sound when driving I don't hear this sound if I rev her up without any load. Other than the power lag and the slight knock she runs very well.

Both vehicles have Alisport intercoolers and the 130 has cat removed but cat box still on don't know if this could be a problem as it gives the exhaust a very hollow sound compared to my 110. I want to take this off some time and put a through pipe as I don't like the sound it has.

any advise or guidance welcome. I an a competent diy mechanic and have had a TD 5 for some time puma is new to me though.

regards
Garry

13th Jan 2017 6:19am

blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 17432

2007 Defender 110 Puma 2.4 DCPU Stornoway Grey

Do you know if there are any DTCs (fault codes) stored in the ECU?

There are many things which could cause a loss of power like this and checking for DTCs would be a logical first step to try to narrow it down.

My intial suspects would be MAF/MAP sensors, EGR valve, VCV, or turbo actuator malfunction. Some of these will/may produce DTCs, others won't.

Power lag and knock could well be related since the most likely cause of the power lag is some form of fuel/air management problem, which could very well cause slight knocking.

13th Jan 2017 8:51am

garryc

Member Since: 12 Jan 2017
Location: Durban
Posts: 6

Ok checked with icarsoft following DTCs
P1935 Brake switch / sensor this is probably why my brake light is flickering
P1643 Can link engine control module / transmission control module / network malfunction
U0001 High speed CAN communication bus
P0404 Exhaust gas recirculation control - circuit range / performance (possible problem ?)
U0100 Lost communication with engine control module / power train control module
U 3000 control module
P1602 Immobilizer / engine control module communication error

I cant seem to clear these faults so can check which ones are current or not.

to add that on the 130 I also have a UltraGauge plugged in to ODB2 port which give live data on various reading most of which I have no clue what they mean or should be.

Regards
Garry

13th Jan 2017 9:50am

blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 17432

The one that initially jumps out from that list is the EGR fault.

Has the EGR valve become noisey recently, or stopped being noisey recently? A malfunctioning EGR valve could be the culprit but is not easy to diagnose except by replacement.

13th Jan 2017 12:19pm

ericvv

Member Since: 02 Jun 2011
Location: Near the Jet d'Eau
Posts: 5816

2009 Defender 110 Puma 2.4 SVX Station Wagon Santorini Black

^^ Not sure about EGR being at fault here. I once had a malfunctioning EGR and truck would only go into "safe" mode with "check engine light" on, meaning quite limited power, so I could not even get it to rev above 2000rpm. So it surely would not pull up to 3500 as seems the case here.
Eric You never actually own a Defender. You merely look after it for the next generation.
http://youtu.be/yVRlSsJwD0o
https://youtu.be/vmPr3oTHndg
https://www.youtube.com/watch?v=_GtzTT9Pdl0
https://www.youtube.com/watch?v=ABqKPz28e6A
https://www.youtube.com/watch?v=rLZ49Jce_n0
https://www.youtube.com/watch?v=XvAsz_ilQYU
https://www.youtube.com/watch?v=K8tMHiX9lSw
https://m.youtube.com/watch?v=dxwjPuHIV7I
https://vimeo.com/201482507
https://www.youtube.com/watch?v=ZSixqL0iyHw

13th Jan 2017 12:37pm

garryc

Member Since: 12 Jan 2017
Location: Durban
Posts: 6

I don't here any noise from the egr in fact my 110 has this irritating chi chi chi sound when shutting down which I doubt hear on my 130. I can swap egr valves but will be cleaning sensors and checking boost first as I believe the egr is a bit of a b!tch to access on these 2.4s.

14th Jan 2017 11:52am

ericvv

Member Since: 02 Jun 2011
Location: Near the Jet d'Eau
Posts: 5816

That "chi chi chi" sound on shut down is exactly what you should hear with a 2.4 TDCi. That is the sound of the EGR cleaning cycle. Something would be wrong if you would not hear that.
Eric You never actually own a Defender. You merely look after it for the next generation.
http://youtu.be/yVRlSsJwD0o
https://youtu.be/vmPr3oTHndg
https://www.youtube.com/watch?v=_GtzTT9Pdl0
https://www.youtube.com/watch?v=ABqKPz28e6A
https://www.youtube.com/watch?v=rLZ49Jce_n0
https://www.youtube.com/watch?v=XvAsz_ilQYU
https://www.youtube.com/watch?v=K8tMHiX9lSw
https://m.youtube.com/watch?v=dxwjPuHIV7I
https://vimeo.com/201482507
https://www.youtube.com/watch?v=ZSixqL0iyHw

14th Jan 2017 12:55pm

garryc

Member Since: 12 Jan 2017
Location: Durban
Posts: 6

Can the egr be blanked off on the puma 2.4 have done it on my td5 and BMW e46 in the past. Will it result in engine light coming on?

6th Apr 2017 7:09am

blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 17432

Simply blanking it will cause problems (MIL illuminated), it needs to be disabled in the map. Many people then also blank it off.

6th Apr 2017 7:40am

Thon

Member Since: 22 Nov 2015
Location: Salisbury Plain
Posts: 696

Just For information, EGRs can be faulty even if they do make the shutdown noises as they are supposed to.

Mine started misbehaving and driving horribly, stuttering, lurching, throwing up errors, etc, but later turned out that it wasn't opening/closing when it was supposed to - I guess it was dying/seizing partially. However it always made the shutdown noises it was supposed to. The biggest clue for me was that the induction noise (from the side air intake) would vary in volume without any change in engine load, so something was obviously adjusting itself incorrectly.

My workshop recommended not blanking it out, and personally I would prefer to keep any emissions-reducing equipment fitted. One EGR every 10 years isn't going to break my bank.

6th Apr 2017 9:48am

custom90

Member Since: 21 Jan 2010
Location: South West, England.
Posts: 20430

Probably EGR stuck open. $W33T $0U7H3RN $UG4R
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6th Apr 2017 10:38am

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