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Omega Help Area => Omega General Help => Topic started by: zirk on 20 August 2008, 18:15:34

Title: 2.5TD Tractor sudden drop in MPG ??
Post by: zirk on 20 August 2008, 18:15:34
Mainly drive the Estate in and arround London, Fully Loaded with bits and Stuff on the Roof. Was averaging 37 to 40 MPG.

Last couple of weeks Im down to 30 - 33 MPG. Checked for Petrol leaks, Oil and Water all Ok, No change in driving style and no apperent loss in performance (just as slow). Also tried variants of different Petrol Co.s

Any thoughts on what I could be looking for?  
Title: Re: 2.5TD Tractor sudden drop in MPG ??
Post by: TheBoy on 20 August 2008, 18:50:45
temp normal?

Can you read codes?
Title: Re: 2.5TD Tractor sudden drop in MPG ??
Post by: LFF64 on 20 August 2008, 18:55:22
Diesel or petrol  :D
Title: Re: 2.5TD Tractor sudden drop in MPG ??
Post by: TheBoy on 20 August 2008, 19:02:15
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Diesel or petrol  :D
no petrol leaks, but a rather great diesel leak ;D
Title: Re: 2.5TD Tractor sudden drop in MPG ??
Post by: TheBoy on 20 August 2008, 19:02:31
worth checking leak-off pipes
Title: Re: 2.5TD Tractor sudden drop in MPG ??
Post by: zirk on 20 August 2008, 19:25:45
Quote
temp normal?

Can you read codes?

Its a pre Maf type, I didn't think you could clip TD's?, I'll try it, remind me pins 4 and 5?
Title: Re: 2.5TD Tractor sudden drop in MPG ??
Post by: Omegatoy on 20 August 2008, 20:13:47
as stated by the boy leakoff pipes are favourite here BUT  dont forget to check the kong one that returns to the pump as it goes under the inlet manifold out of sight is a favourite place for leaks to hide!!! :y
Title: Re: 2.5TD Tractor sudden drop in MPG ??
Post by: zirk on 20 August 2008, 20:18:42
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as stated by the boy leakoff pipes are favourite here BUT  dont forget to check the kong one that returns to the pump as it goes under the inlet manifold out of sight is a favourite place for leaks to hide!!! :y

Thx :y
Title: Re: 2.5TD Tractor sudden drop in MPG ??
Post by: osealy on 20 August 2008, 22:40:31
I had one with leaky injector 4? the one with the wire. It used to leave bad stains whenever it was wet on the ground, Mpg was no worse than 30-34 same as previous and post MAF noMAF. Are you going by the computer,or tankfull. I do not believe a laden est will do 37-40 with stuff on the bars.
Title: Re: 2.5TD Tractor sudden drop in MPG ??
Post by: zirk on 21 August 2008, 11:13:25
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I had one with leaky injector 4? the one with the wire. It used to leave bad stains whenever it was wet on the ground, Mpg was no worse than 30-34 same as previous and post MAF noMAF. Are you going by the computer,or tankfull. I do not believe a laden est will do 37-40 with stuff on the bars.

I cant find any leaks or stains any where, checking the MPG with both MID and Tank, the Mid seems to be spot on.

Must point out mine is a Manual, makes a big difference over a Auto when driving fully loaded in stop start London. :y
Title: Re: 2.5TD Tractor sudden drop in MPG ??
Post by: andyiow on 22 August 2008, 15:27:39
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worth checking leak-off pipes

I am assuming that these are the ones that link all the injectors together. Also do they have a oneway system inside themand if they do I assume that it would go from the back injector (no 6) to the front. Only asking as I will be replacing these pipes this weekend as I always seem to get air stuck in the no 5 injector.

Got told my an ex-mechanic if you place a rod on the injector you can hear the difference between one with air trapped and one not. Doing the Diesel Magic on it as well to try and stop the intermittant EMl I get.
Title: Re: 2.5TD Tractor sudden drop in MPG ??
Post by: TheBoy on 22 August 2008, 16:15:43
just by feel you can tell if there is air in it
Title: Re: 2.5TD Tractor sudden drop in MPG ??
Post by: zirk on 22 August 2008, 16:40:49
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just by feel you can tell if there is air in it

I assume you mean the Tank?, if so will check 2morrow as been driving the MV6 arround last couple of days because of the problem.
Title: Re: 2.5TD Tractor sudden drop in MPG ??
Post by: TheBoy on 22 August 2008, 16:42:15
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Quote
just by feel you can tell if there is air in it

I assume you mean the Tank?, if so will check 2morrow as been driving the MV6 arround last couple of days because of the problem.
Sorry, I was referring to the post about air in injector feeds...
Title: Re: 2.5TD Tractor sudden drop in MPG ??
Post by: MickAP on 22 August 2008, 17:29:28
Quote
Mainly drive the Estate in and arround London, Fully Loaded with bits and Stuff on the Roof. Was averaging 37 to 40 MPG.

Last couple of weeks Im down to 30 - 33 MPG. Checked for Petrol leaks, Oil and Water all Ok, No change in driving style and no apperent loss in performance (just as slow). Also tried variants of different Petrol Co.s

Any thoughts on what I could be looking for?  

Wish I got that MPG on short city driving journeys, mine is always around the 33 mpg.......longer motorway journeys around 42/45 mpg, are you sure the figures are correct?

Mick
Title: Re: 2.5TD Tractor sudden drop in MPG ??
Post by: dieseldean on 23 August 2008, 16:06:26
wish i hadn't retired my 1994 2.5td it took me to work around 45mpg whereas its repacement 1998 2.5td only manages 33 on same run