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JimboD3

Member Since: 09 Apr 2013
Location: Ware, Herts
Posts: 55

Td5........lack of boost

Morning all,

My '53 plate Td5 110 seems to be lacking in power - it's never had a really high top speed, but has always been resonably quick in getting to 60mph, lately though it seems to be really 'sluggish' and whilst it still gets to 60+, it doesnt fly quite like it used to.

What I've done to investigate so far:

Disconnected the MAF sensor - no real difference in performance noticed
Replaced the MAF sensor - had a known working spare 'in stock' anyway - no real difference noticed
Changed the fuel filter - it was weeping a bit from the top, no difference noticed
Cleaned the MAP sensor - it didnt appear to be gunked up (EGR went walkies a long time ago)
Cleaned the AAP sensor - no difference noticed
Replaced the air filter - used an original, new LR one.
Checked that the turbo wastegate actuator moves (with a pair of grips)

Other than the EGR being blanked, the engine is standard - no remap, no big intercooler, no silicone hoses etc......and there's no smoke when trying to accelerate hard (which I thought there would be if one of the hoses was collapsing ?), but I do have a Safari RAI fitted (and it always has been fitted)

The engine starts fine, and idles fine, you pull away and there's virtually nothing........foot to the floor.....and not a lot, and then slowly it starts to pick up..........and then into 2nd and it feels 'flat' again, but eventually it begins to pick up - it's almost as if the turbo is not boosting (I think !)

I've got a first gen Nanocom - no faults are logged (other than the usual A/C ones etc) - I've searched all over the t'internet for some real time values to compare my readings against, but that sort of info seems to be really hard to find.

The reading that the Nancom gives for the 'turbo wastegate modulator' is zero at idle (which I belive is correct), rising to 40.00 with foot hard down in 3rd going up an incline on a dual carriageway - does anyone know what the value represents ?

Whilst having another prod around the engine bay this weekend, I noticed that the air inlet hose (the one from the air box to the turbo - with the MAF sensor in it) seems to be very 'squashable' at the sharp bend where the hose reduces to fit onto the turbo - is this ok, could it be squashing down as the turbo tries to spool up ?

Any ideas, suggestions, Nanocom values will be gratefully received.

Jim Td5 110 HD Hardtop.......not quite standard

20th May 2015 10:27am

mk1collector

Member Since: 17 Sep 2009
Location: West Yorkshire
Posts: 6769

Have you checked for oil in the red plug on the ecu? Ray
My build thread
http://www.defender2.net/forum/topic17615.html

20th May 2015 11:33am

K9F

Member Since: 12 Nov 2009
Location: Bournemouth
Posts: 9610

2008 Defender 90 Puma 2.4 XS CSW Stornoway Grey

Hose 'collapse' is an issue that has been experienced if you do a search on the internet and for a small outlay could be negated as the cause or even cure it perhaps? The issue of oil ingress in the injector harness is well documented on here as a cause of power loss too!

If you go through life with your head in the sand....all people will see is an ar5e!!

Treat every day as if it is your last....one day you will be right!!

20th May 2015 11:38am

JimboD3

Member Since: 09 Apr 2013
Location: Ware, Herts
Posts: 55

Hmm, oil in the injector harness...........I replaced the harness a couple of years back as it was just starting to leak into the multiplug on the underside of the head, but hadn't got to the ECU. It's not something I've checked for a while - will investigate that later today.

Remind me - do you need to disconnect the battery to remove/check the red plug ? Td5 110 HD Hardtop.......not quite standard

20th May 2015 11:46am

RF3777

Member Since: 10 Apr 2015
Location: Hong Kong
Posts: 144

Is there anyway to know if the turbo is dead?
Jimbo, I disconnect the negative cable every time I remove the red plug!

20th May 2015 4:29pm

JWL

Member Since: 26 Oct 2011
Location: Hereford
Posts: 3443

Whereas I never disconnect the battery, ignition is off though i.e. the key is out.

20th May 2015 5:52pm

Fatboy Slim

Member Since: 04 Feb 2008
Location: Bridgend
Posts: 1006

Take your cat off and give it a run down the road. See if it goes any better.

20th May 2015 9:54pm

Carlosbeldia

Member Since: 13 Oct 2013
Location: Cartagena
Posts: 43

fuel pump dying? stuck fpr? blocked fuel lines?

21st May 2015 12:41am

JimboD3

Member Since: 09 Apr 2013
Location: Ware, Herts
Posts: 55

Ok, so have spent some time investigating this problem a bit further........

1. No oil in the red ECU plug
2. No oil in the injector loom connector front left of the head
3. Turbo wastegate actuator linkage disconnected and confirmed that the wastegate moves freely in the turbo
4. All turbo/intercooler hoses checked for 'secureness'
5. EGR valve replacement tube removed and checked - I thought there was a small trace of oil leaking where the lump of billet joins the inlet manifold.......checked both surface for 'flat' and made a new gasket.
6. Got SWMBO to floor the loud pedal whilst I watched the I/C hoses - nothing appeared to collapse, but then maybe it needs to be under a proper load ?
7. Went for a test drive - still the same..........Nanocom readings were (from memory):
MAF - a max of around 450 (Kpa ?)
Inlet manifold pressure - a max of just over 200 (Kpa?) seen in 3rd gear foot flat on the floor

There's no rough idle or rough/lumpy running - it just doesnt pick up speed like it used to..............which to me doesnt seem like a fuelling problem - but could it be ?

Jim Td5 110 HD Hardtop.......not quite standard

24th May 2015 6:05pm

dorsetsmith

Member Since: 30 Oct 2011
Location: South West
Posts: 4554

fuel presser ?

is the tubo ok i.e not exces play or score marks as if the compressor rubbing and jamming ?

24th May 2015 6:36pm

K9F

Member Since: 12 Nov 2009
Location: Bournemouth
Posts: 9610

Could still be collapsing hoses perhaps? Under load as you mentioned which cannot be checked stationary unless you've a rolling road. are they in good condition with no 'soft spots' or delamination? If you go through life with your head in the sand....all people will see is an ar5e!!

Treat every day as if it is your last....one day you will be right!!

24th May 2015 6:59pm

Fatboy Slim

Member Since: 04 Feb 2008
Location: Bridgend
Posts: 1006

Take the cat off

24th May 2015 9:02pm

K9F

Member Since: 12 Nov 2009
Location: Bournemouth
Posts: 9610

I think he heard you the first time!

Catalytic convertor is not the main issue here though is it? Undoubtedly it will pick up quicker with the rapid spool up of the turbo but it could potentially mask the root cause of the problem. If you go through life with your head in the sand....all people will see is an ar5e!!

Treat every day as if it is your last....one day you will be right!!

24th May 2015 10:38pm

Fatboy Slim

Member Since: 04 Feb 2008
Location: Bridgend
Posts: 1006

I've had a few blocked lately giving the same fault. One was so bad it wouldn't even start.......

24th May 2015 10:55pm

grafty99

Member Since: 15 Aug 2012
Location: North Devon
Posts: 4784

Missed that sticky wastegate had been mentioned

2002 90 Td5 Station Wagon
1990 Vogue SE
Triumph Tiger Explorer 1200
Td5 90 Thread http://www.defender2.net/forum/topic50767.html
Tdi 110 Thread https://www.defender2.net/forum/topic69562.html
RRC Thread http://www.defender2.net/forum/topic54492.html
Instagram http://www.instagram.com/george_grafton

24th May 2015 11:28pm

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