Td5 power loss intermittent, any ideas?

Hi Lads,

just wondering if any of you have any experience with power loss on a Td5? I have a Defender 2005 and recently ive noticed when i start in the morning (any morning not a cold one) the power is down. only getting power after 2500rpm then after a few mins it get better. At high speed it will only manage 70mph BUT if i come to for a couple of seconds i get back to full power with excellent acceleration and can easily get up to 85mph. At first i thought it might me an injector issue but i cant be sure. I have a BBS Nanocom dignostic and ive run fault reading and i havent seen anything wrong. Ive also checked the injectors and they seem to be firing so im at a loss. Any advice would be appreciated.

Thanks

fuel filter needs changing? Oil in loom to the ECU?

Have you tried taking a live reading using the nanocom and storing it, then you could show the file here, may help show if there is a problem on start up or if something changes when you have the problem.

Cheers

Hey lads,

Did a check on the wiring loom and what do you know....



blew out the oil and had a replacement injector harness loom knocking round, installed it and ran it but still no change. Any more ideas?

Just for fun and to see if the problems can be seen , see my message above, would be good to see a report to see how it runs from cold start until it is good.

cheers

Yeah I suppose i could do that. Can you tell me what the process for recording the data on a Nanocom is? havent dont it before

Put an SD card in it.
Go to TD5 instruments mode and you will see a floppy disk.
press this and you should see a request to save and a request for a file name.
input a file name and press ok, it should say somehting like saving iinput data.
remember to press the floppy disk to end the saving of data.
put the sd card in computer and upload it, then load the file on here. or put it in an excel file to show the info.

cheers

excellent just formatting an SD card now/

ok so did a test drive and was able to get the data for full power and then for low on power. see if any of this makes sense

https://www.dropbox.com/s/fzrdu2kwsg56w54/TEST1.CSV?dl=0 (It was running tip top on this diagnostic)

https://www.dropbox.com/s/kfekty2bqpac4zj/TEST2.CSV?dl=0 (exact same road driven with the power low)

https://www.dropbox.com/s/dd8y5jdjz4nl7xl/TEST3.CSV?dl=0 ( a drive home with the power low)

in the CSV format it's hard to figure out things, open an excell page import the CSV file then put ; as delimiter, or open the file with excell, highlight the whole data, select ''text to columns'' and use the delimiter. then you get .xlsx format
i converted only one and it's enough for me to say that your MAF is fubar'd, did you try to see how it goes with it unplugged? ... it's clearely visible that the idle reading is too low (41) should be between 55-60 and the reading under load beetween pos 28 -34 is around 330 and should be between 600-650 there, unplug the MAF and drive it so cos i have the feeling it will run OK untill you buy a new one...get VDO only, if you still have EGR at least clean it but better bypass it...keep cleaning the red plug once a week untill all the oil leaves the harness

Thanks sierrafery, I am about to go on a spin which will take 1 hr. I will disconnect the MAF and see what happens. Thanks for the tips I will let you know what the out come is

Just a quickie from me, what is going on with the idle speed error, is it meant to show negative values like that, I know my TD5 disco does not. also there is a difference when the engine speed is the same / similar between the runs and the idle speed error.

Cheers

Hi lads,

Im on the road now and difference is night and day after disconnecting the MAF sensor. Will get a new one and report back

In a PDF so that you can see the differnces between the 3 runs, if you see the engine idle speed error to the engine speed there appears to be quite a fluctuation, if you do the maths between the two.

Cheers

as long as the sum of track 1 + track 2 = supply there's no problem with the TPS input cos the idle speed error is the difference between the driver demand and the real engine speed which is normal on a sluggish engine cos as the engine management is mixed up by a bad air flow input the engine will not pick up revs immediately as you push the throttle also the revs are not dropping immediately as you release the pedal... that "idle sped error" reading is quite feckless, there's no pattern with it to show a problem as long as all the other readings are OK it depends on each driver's right foot, there are cases when the throttle is a bit 'abused that the internal soft of the tester to be too slow to calculate well.... not a very relevant reading for diagnostic purposes

Hi All, only got round to getting a new MAF sensor and fitting it 2 days ago. Job is a gud'en done and dusted. All is running well and delighted with the result. Thanks again for the help lads.

Always great to see the full story and stow it away for when mine does the same (almost certain some time!) - good news and thx all for posting. A