bukko · Aug 13, 2019

This issue has come on recently. A quick search says the MAF sensor is the likely culprit but I didn't think my 2002 model had one.
Should it be on the air intake pipes like they usually are?
If it isn't that, what else might it be? (It doesn't have an EGR).
Thanks

GrumpyGel · Aug 13, 2019

Sure all TD4s have a MAF and it will use it for fuelling as well, not just for EGR which is what the L Series uses it for.

Nodge68 · Aug 13, 2019

The MAF is under the air filter top cover. If the MAF signal is low, then it will limit power output of the engine. You can test this by unplugging the MAF and driving it to see if there's an improvement. If power is restored, then the MAF signal is weak enough to trigger the anti smoke program on the EDC, hence the limited power.

If unplugging the MAF makes no difference (other than putting the MIL on), then the problem generally lies elsewhere.

hd3 · Aug 13, 2019

bukko · Aug 13, 2019

Thanks for the replies all, will give it a go and update on progress.

bukko · Aug 17, 2019

The MAF sensor appear to be held in with some kind of Torx security bolts with 5 pointed stars instead of 6.
Anyone know where to get some bits like that?

[Edit] Arriving tomorrow from Amazon [/Edit}

teddywood1 · Aug 17, 2019

any good car shop should have them as they are put on a lot of cars and all called security bolts .

bukko · Aug 20, 2019

teddywood1 said:
any good car shop should have them as they are put on a lot of cars and all called security bolts .

Strangely the ones I asked in only had 6 pointed security bolts. Got them ok online though.

bukko · Aug 20, 2019

I replaced the MAF sensor but this hasn't made any difference.
While on the drive with the engine running it won't rev over 2000 rpm, then it starts to misfire.
What else could it be? Turbo solenoid maybe?

Madmustang · Aug 20, 2019

bukko said:
I replaced the MAF sensor but this hasn't made any difference.
While on the drive with the engine running it won't rev over 2000 rpm, then it starts to misfire.
What else could it be? Turbo solenoid maybe?

Was it a new OEM One or a new cheaper one or Second hand?

bukko · Aug 20, 2019

Madmustang said:
Was it a new OEM One or a new cheaper one or Second hand?

New OEM, allegedly.
But, to be fair, I didn't try it without one at all as advised. Maybe I should just do that

hd3 · Aug 20, 2019

While on the drive with the engine running it won't rev over 2000 rpm, then it starts to misfire.
What else could it be?

how many miles on the current low press. fuel pump ?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

bukko · Aug 20, 2019

hd3 said:
how many miles on the current low press. fuel pump ?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

I've only had the car around 4-5 months but the car has done about 98k, so it could be as much as that.

hd3 · Aug 20, 2019

but the car has done about 98k, so it could be as much as that.

if it is the original pump .. then it's at the final stages of its life ( i reckon )

my original factory one lasted 71k miles ..
death throws: revs hitting a brick wall at 3k rpm ..
then soon after .. next day .. brick wall at 2300 rpm ..
changed the lp pump quickly before it quit for good
replaced with an oem part
~~~~~~~~~~~~~~~~
the replacement lasted 105k miles
death throws: intermittent lack of power ..
i.e. not every journey .. some days ran great ..
then it would go limp ( no dash warning light )
turn off motor .. restart .. and all would be fine .. until next time
then one day it simply quit dead
( didn't have the rpm.brick-wall effect ..
( just slug-like behavior on trying to accelerate
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Nodge68 · Aug 21, 2019

bukko said:
While on the drive with the engine running it won't rev over 2000 rpm, then it starts to misfire.

Sounds like the LP pump to me. But check the rail sensor for corrosion on the terminals first.

bukko · Aug 21, 2019

Nodge68 said:
Sounds like the LP pump to me. But check the rail sensor for corrosion on the terminals first.

Thanks will look it up.

Nodge68 · Aug 21, 2019

bukko said:
Thanks will look it up.

You want to check the live data while driving it. The LP needs to stay above 325 Kpa, or the EDC limits power output.

websun · Aug 23, 2019

bukko said:
The MAF sensor appear to be held in with some kind of Torx security bolts with 5 pointed stars instead of 6.
Anyone know where to get some bits like that?

[Edit] Arriving tomorrow from Amazon [/Edit}

Those are TS25

LE: I saw it was already removed. Check LP pump and all them small hoses for a split.

bukko · Aug 25, 2019

Had a go recording some live data.
Can't see anything to do with low pressure fuel pump though.
I can see:
- Throttle Position
- Coolant Temp
- DTC code generated (none)
- MAP
- RPM
- VSS (speed)
- Air temp

Do I need a LR specific reader for that?

bukko · Aug 25, 2019

websun said:
Those are TS25

LE: I saw it was already removed. Check LP pump and all them small hoses for a split.

Looks like I've got some time tomorrow afternoon so I'll check all the hoses then.

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