Discovery TD5 lacks guts at around 15 to 18 100rmp....Need help!!!

Hello
Just need a little help
I have a 2001 disco TD5 in 5 years never a problem.....now very poor acceleration in lower band RPM. Also generally poor MPG.
Used to be able to get up to 36 MPG now around 25 MPG on similar journeys.Between 1500 and 2200 ish.....RPM absolutely crap acceleration accompanied by a droning sound as if exhaust is blowing-but it is not blowing just sounds like it is-

Any help you could give me on this would be very much appreciated.

Kind regards Clive Jones

Possible EGR valve issue.

Try cleaning or replaceing your Maf (Mass Air Flow)
It's a doo dar with wires going to it in the black pipe from your air filter to the engine.
They can get all caked up and not send correct air flow readings to your ECU which in turn dunt put enough gas through!

hi have you checked the pipes from the turbo
it sounds like one of them if you can hear a blowing nose

Possible EGR valve issue.
Hi there,
Thank you for your input.
Will be going down the EGR blanking route any way. Cheaper than replacing EGR.
Will let you know the outcome
Thanks again.!

Clive

hi have you checked the pipes from the turbo
it sounds like one of them if you can hear a blowing nose

Will try out with wifey on throttle while i listen this weekend.
Thank you

Try cleaning or replaceing your Maf (Mass Air Flow)
It's a doo dar with wires going to it in the black pipe from your air filter to the engine.
They can get all caked up and not send correct air flow readings to your ECU which in turn dunt put enough gas through!

Have had a look and looks perfectly clean. May have to get diagnostic check before replacing if this is trhe problem.
Thank you!

Thank you all once again,
Clive

Try cleaning or replaceing your Maf (Mass Air Flow)
It's a doo dar with wires going to it in the black pipe from your air filter to the engine.
They can get all caked up and not send correct air flow readings to your ECU which in turn dunt put enough gas through!

Have had a look and looks perfectly clean. May have to get diagnostic check before replacing if this is trhe problem.
Thank you!

Thank you all once again,
Clive[/quote]

It might look perfectly clean but if you get a few cotton buds and pipe cleaners dipped in petrol into them orifices you will probably see that it's not as clean as you thought!!!!!

If you are having a diagnostic check done get them to check the boost - this can only be done while driving, best up a hill in 3rd at about 2750rpm. This will show up problems with the turbocharger and related parts and pipes.

I have a 2002 TD5 Disco, 96k miles. Just recently I had the Turbo pipe replaced as it had corroded. The pipe goes from the Turbo forwards to the radiator area, a flexi pipe at each end, and a 2" metal pipe in the middle). Apparently they corrode and need replaced every few years (there's also aftermarket ones made of stainless available). Worth a look?

I agree, sounds like a turbo problem to me - especially if you can hear a blowing sort of noise. Had something similar on a BMW - the pipe on the intercooler was loose and blowing.

Matt

Hi
I'm new but decided to register when I saw this thread as my 2002 TD5 is doing the same thing.

It seems its fine when cold, but once warm runs really badly at low revs (below 2000).

My Mate borrowed it to tow his caravan at the weekend (his Jeep died I was so smug at the time!!) and it developed the problem whilst he was using it

Someone else suggested the intercooler / turbo pipes breaking down inside so I have ordered them, I'll let you know if that works

Update on mine that might help the original poster

I took it to a specialist for a diagnostic this morning. The fault code displayed was for intermittent injector fault.

This turned out to be degradation of the part of the wiring loom that resides in the top of the engine and delivers current to the injectors. This goes brittle over time and eventually gives trouble.

Running beautifully now.

Hope you get yours sorted soon if not already

That is a common problem - full details are listed here -
Web Rover

Thanks all
egr blanked and maf cleaned. Also oil changed- well overdue. Runs well but still same exhaust blowing type noise at 1500 to 1800 rpm. will be checking out turbo/ intercooler hoses this weekend.Convinced also that u have to give it some really hard right foot now and again to keep things clean.
To this end I buggered the fuel cost and gave it some serious rice over a 5 mile sprint at just touching 98 mpg(frightening but rewarding) down M53. For economy reasons ive been doing a steady 55 mph over last 3 monyhs on new job of 100 mile round trip per day.Loads of crap out of exhaust initially but now clean and running well-bar the 'blowing exhaust type note'
Its more annoying now than performance/ economy related but keen to sort.
Im a tight git so not letting LR go down testbook route yet. Any more ideas?
clivey

clivey said:

Convinced also that u have to give it some really hard right foot now and again to keep things clean.

Click to expand...

Actually, a very good specialist I used to go to said that I should give the P38 (diesel) a good blast now and again as it does them good to blow out the crud! - so you're not far wrong!

Matt

please do let me know how you get on with new pipes. Where did u get them
from and how much£
cheers

Turbo pipes made no difference but as we know now something else was up with mine.

They were delaminating inside though so probably best to have done them

I paid £86 for the two pipes including VAT from a dealer....not cheap

Well just to back up what a lot of has been said on here my LR dealer failed to spot anything wrong and the car has been bad for about 6 months, so much so that it has just spent two weeks at LR with their technical boffins. OH what a surprise when they say extensive tests have shown nothing wrong but agree it is not right. They suspect but cannot prove it could be the injectors but say that is a very expensive job.

Anyone got any ideas on whether it is worth going down the expense of that route (and what sort of expense I can expect), especially as they "only suspect".

scolliss said:

Well just to back up what a lot of has been said on here my LR dealer failed to spot anything wrong and the car has been bad for about 6 months, so much so that it has just spent two weeks at LR with their technical boffins. OH what a surprise when they say extensive tests have shown nothing wrong but agree it is not right. They suspect but cannot prove it could be the injectors but say that is a very expensive job.

Anyone got any ideas on whether it is worth going down the expense of that route (and what sort of expense I can expect), especially as they "only suspect".

Click to expand...

Scollis, having the wiring changed to the injectors will not break the bank and made all the difference to mine. Check out the post above following mine where someone posted a really useful link on the problem with a desription on how to rectify it. Mantamad's post has the link you need. If I had known what the problem was I would have performed this fix myself, it looks very easy.

right. Not been on here for a while. Thanks for everybodys contribution.

Got around to changing injector loom. Easy job. I know this has previously been covered but i thought id add my experiences if it can help anybody.

Remove three bolts from engine cover.Remove engine cover-no brainer.

Unbolt 13 (I Think) rocker cover bolts. The bolts run through metal insert pegs/guides with a rubber washer on top. Remove the locators to a safe place.The back two bolts are a bit difficult to get at with a wrench. Got around this by using a suitably sized allen key with short end plugged into socket.The bolts only need slight hand pressure with a small socket bar.

When bolts removed cover lifts off fairly easily, with a bit of juggling needed where rear of cover tucks under the bulk head sound attenuation cover.

On each 5 injector connections just push back metal spring locator thingy and lift connector off.Push the body of the round connector upwards and out. Loom is now free.

Replacement is reverse.

Didnt need a new gasket-its rubber and stayed in its location grooves on underside of rocker cover. Just push in to reseat if neccessary before relocating on engine.Careful that you dont unseat rear of gasket when your juggling back in. put in location pegs, insert and hand tighten bolts.reconnect engin loom plug to injector loom plug.

Job only takes about half an hour as somebody has previously stated...and a monkey could do it.

However the humming blowing exhaust type note persisted at low revs under load.(Annoying Ba***d thing)

Next checked for oil in ECU. You may think that you may have to remove negative lead to battery to get out. Not so- again a bit of juggling will get it out.

Unplugged red ECU connector and of course guess what. Full of engine oil. Drained out and blasted with wd40. Same with red female connector. Left apart for an hour to drain further. Reconnected. Test drove and definite reduction in this 'blowing noise'. Performance noticeably better aswell.

Will continue each week to drain any further oil from ECU untill no more appears- rather than change engine loom.(Tight git remember) Reckon this will sort it 100%.

Cost of injector loom £40 inc pp from beamends.and 10 pence worth of wd40.(quote from local LR dealer- suggested that engine loom will have to be replaced- fair comment.£450 + plus an ecu if neccessary... and im certain they would say it was needed .. another £600. Bargain !
Clivey