Thread: So the PUMA goes back to the garage again tomorrow

ours scanguarge is also premantly set on the dash

ours reads ambient, water, revs and ltrs per k......

Tim if we have a similar problem might be worth setting them the same and comparing figures.

It would be interesting to plumb in warm-over-exhaust air like many petrol vehicles and see if it still happens.I'm still thinking the ECU is trying to get the motor to do what it wants it to do before it's warmed up and able to deliver,that would cause knocking as the fuel is not burning in a smooth wave but pulses and thats the ''knock'' you hear.Every owner so far has posted that the problem never happens at operating temp. Pat

sorry guys but its not going to be an individual item that causes it IF its what Im suspecting it is.

the short version is.

its a cumulative error thing. several things have to be slightly wrong at the same time for it to happen. the kicker is no individual thing will be far enough wrong for the ECU to log a fault....

the long, sort of close enough but not technically exactly how it happens version is

think of it as measurements, each sensor or factor represents one measurement

if we define 1 cm to be 1cm +/- .2mm then if we make 5 measurements using 5 ipoints and let the ECU do the maths then

.8+1.1+1.1+1+1=5

1.2+1.2+1.2+1.2+1.2=5

.8+.8+.8+.8+.8=5

so if each one of the factors (represented by one measurement) is out then you get a cumulative error but if you check each sensor/factor one by one then its within spec .

but if you make one overall measurement then you should come up with 5,6, and 4 for the examples above. we can see that the maths isnt right but because the info isnt being flagged as erroneous the ECU can keep working with it.

very roughly thats what the knock sensor (or its equivelent) does for you

all the other sensors give their input, the ecu makes its determination based on the info its got and then if it gets it wrong the knock sensor makes an overall measurement and tells the ECU "thats wrong" and then it makes adjustments as needed.

Originally Posted by muddymech

...on another note the dealer is in talks with landrover and has said fault codes were logged and they have been supplied to landrover, first i had heard of it, but asked for the codes and should have them tomorrow. hopefully some one on here will help diciffer them.
ian

I'm also very interested to see what fault codes they got. When my dealer informed me that they had found a fault code, that's when they decided to replace the EGR. I wonder if your's will have the same one.

Still not convinced that it has totally fixed mine, but it is certainly better. (refer other Puma rattle thread post regarding my changed morning routine).

we have had fault codes before when its happen...most of them being realted to fuel pressure valve thingy on the common rail...

Originally Posted by dullbird

we have had fault codes before when its happen...most of them being realted to fuel pressure valve thingy on the common rail...

Ahh.......... the "ol fuel pressure thingy on the common rail trick again".




Will you hurry up a get this sorted DB, I want to buy one!

hey if it was up to me I would of had it sorted last year unfortunately we have to wait for these mechanics to do it......A mechanic that might I add blamed a bolt missing out of our rear anti roll bar for our pulsing problem anyone else that has had the pulsing got a bolt missing? ...if so thats your fix

Had a mate who had the same problem with a D3. The garage had it more than he did . In the end he wrote to land Rover Uk and faxed it to them and the dealership, the dealership owner and anybody he could think . He did this when it was in the garage saying that he wanted the car fixed by a certain date or a new car or his money back in cash waiting for him.

Land rover gave him a brand new D3 as they could not fix his D3