excessive fuel consumption rd2!

[discowhite]

buggered if i know!
after i thought i had gotten somewhere with my fuel consumption issue in the D2 it appears i havnt:mad:
replaced every sensor except the map sensor...
the last 2 tanks showed 11-11.8L/100k
this tank i got 17.49L/100k

and that was with the wife driving all of it bar one 80klm trip on sunday.

so ive just changed out number 2 injector as it was showing -7 to +7 on the nanocom while the other 4 showed -3 to +5..
oh and im off to QLD on wednesday, hope im not looking for fuel every 500k's:mad:

stupid brilliant motor

cheers phil

[stig0000]

17-18 LPH thats just crazy,, if i flog it,, 13-14 at worst,,, if i drive normal,, 10-11,, im prity bang on 1L for 10km, and thats with the MAF disconected,;);)

[Disco_owner]

buggered if i know!
after i thought i had gotten somewhere with my fuel consumption issue in the D2 it appears i havnt:mad:
replaced every sensor except the map sensor...
the last 2 tanks showed 11-11.8L/100k
this tank i got 17.49L/100k

and that was with the wife driving all of it bar one 80klm trip on sunday.

so ive just changed out number 2 injector as it was showing -7 to +7 on the nanocom while the other 4 showed -3 to +5..
oh and im off to QLD on wednesday, hope im not looking for fuel every 500k's:mad:

stupid brilliant motor

cheers phil


That's your problem , you let the missus drive it , sure she hasn't got Lead inside her show:angel:

[crossy999]

Out of curiosity, have you looked at/changed the crank angle sensor ?

I'm not sure if this would affect your fuel economy but was the cause of my TD5 showing excessive injector +/- figures on the nanocom.

[discowhite]

Out of curiosity, have you looked at/changed the crank angle sensor ?

I'm not sure if this would affect your fuel economy but was the cause of my TD5 showing excessive injector +/- figures on the nanocom.

was that on all injectors or just one?
it was only #2 that showed the major differance the others were almost the same range.

cheers phil

[discowhite]

17-18 LPH thats just crazy,, if i flog it,, 13-14 at worst,,, if i drive normal,, 10-11,, im prity bang on 1L for 10km, and thats with the MAF disconected,;);)

i know! the 90 towing 3.5t got 15.5L/100, floggin it with out the trailer still got 13's:eek:

cheers phil

[stig0000]

its not underpower is it, have you tryed updating your ECM, unless you have a chip?

[discowhite]

its not underpower is it, have you tryed updating your ECM, unless you have a chip?
nothing i own is ever standard or underpowered;)

cheers phil

[Tombie]

nothing i own is ever standard or underpowered;)

cheers phil

Yes, like several of us... Phil is a sufferer of A.S.C.D.

A debilitating disease known to ruin a man.

[crossy999]

I couldn't find a pattern to the +/- injector readings, they were all prone to large readings (anywhere from +/- 5 to 17); a much different scenario to that of yours if you were only experiencing a single injector out of whack.

[stig0000]

Yes, like several of us... Phil is a sufferer of A.S.C.D.

A debilitating disease known to ruin a man.

god,, im about to get that big time:o:D

[discowhite]

well i think ive finall sorted out the rough idel and the high fuel consumption!!!

the only thing left to do was a compression test....but no one has ever done one around here on a TD5, so i got hold of an old TD5 injector pulled it apart modified it and performed the test!
cyl#1 240psi all the rest 260psi...hmmm no compression. 19.5:1 comp ratio should be closer to 400psi static!
so i wipped the head off and found 2 broken PLASTIC head dowles. they
had allowed the head to move backwards by about 3mm, that was enough to let the steel ring on the head gasket to cross over the cut out for the exhaust valve not sealing each cylinder:eek: so the compressed gasses were jumping between cylinders. the head gasket rings have damaged the alloy head, but hopefully the head shop can skim enough off.

so all in all im pretty impressed as i had the disco on the dyno a few months back and with a tombie chip and no compression and she still made 86.9kw at the wheels:eek:

i put the excessive fuel consumption down to using more right foot to compensate for the loss of compression/power.

cheers phil