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Author Topic: 2.5 td auto power issues  (Read 1668 times)

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philglasgow

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2.5 td auto power issues
« on: 09 March 2009, 11:40:15 »
Folks

After replacing my maf for a new pierburg original ( symptoms no power very poor mpg) the maf fault codes clear ok but when i put it into sport mode and try to drive it hard  it gets to about 3.5 k then starts to chug as if its a fuel issue. foot off gas and its normal again. I had an inline filter for veggie ( but to cold for that  so its removed) and the air and fuel filters are new and its been redxd etc and tank is full .

My mpg is around 22  mpg  and i drive like miss daisys dad
, no fault code flag up no pipes missing that i know of..Could it be the autobox slipping under hi revs? ( well hi for me lol)
any comments appreciated.
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TheBoy

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Re: 2.5 td auto power issues
« Reply #1 on: 09 March 2009, 13:02:06 »
mafs are normally reliable on tractor.  How does it drive with MAF unplugged?
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Grumpy old man

philglasgow

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Re: 2.5 td auto power issues
« Reply #2 on: 09 March 2009, 14:34:02 »
like really slow, i had to horse it to move compared to normal, the new maf definatelty makes a difference it pulls ok and idles well  but just when you try to work it hard it jurks a  bit till u ease off again but i usually drive with sports mode off as Im a stereotypical Scotsman so the poor consumption baffles me.

Rarely it may not change up if ive been driving for a couple of hours but selecting 3 then back sorts it . all sounds ok with the box . fluid was partially drained /topped up  about  5 k ago.



Thanks

Phil
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TheBoy

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Re: 2.5 td auto power issues
« Reply #3 on: 09 March 2009, 14:37:45 »
Sorry, not clear, is it better with MAF unplugged?
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Grumpy old man

philglasgow

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Re: 2.5 td auto power issues
« Reply #4 on: 09 March 2009, 15:13:12 »
sorry no power is reduced  
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TheBoy

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Re: 2.5 td auto power issues
« Reply #5 on: 09 March 2009, 15:39:53 »
OK, I think you need to paperclip it (if its paperclippable - some are, some aren't) or get codes read...
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Grumpy old man

philglasgow

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Re: 2.5 td auto power issues
« Reply #6 on: 09 March 2009, 15:48:17 »
hi

ive did that and it thru up 88/89 which relates to the maf i believe, but no other faults flagged since no eml lights etc but my inst mpg sits at 03/ 04 , on the old maf it showed up 0.1 is this significant??


cheers

Phil
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TheBoy

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Re: 2.5 td auto power issues
« Reply #7 on: 09 March 2009, 17:58:22 »
the bmw engine rarely brings on eml, despite detecting faults.

if its still flagging maf, i'd be suspicious of that, hence just drive around with it unplugged so it puts calculated values in.

mine idles at 0.3gph in d and 0.2gph in n
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Grumpy old man

philglasgow

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Re: 2.5 td auto power issues
« Reply #8 on: 10 March 2009, 09:18:57 »
 your readings are  not too far from mine now, maybe   i will do another paperclip test .

Thanks for the reply

Phil
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philglasgow

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Re: 2.5 td auto power issues
« Reply #9 on: 10 March 2009, 13:16:42 »
hi  i did paper clip test again  heres the results

92 cruise control o/c    i dont have cruise so this is normal i take it

96 egr valve     mine is blocked off at valve but pipe hanging loose not capped.   is this ok???

34  injector timing out of range  . What  governs this ?? is this bad news??



Any ideas welcome thanks


Phil


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TheBoy

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Re: 2.5 td auto power issues
« Reply #10 on: 10 March 2009, 13:23:19 »
Quote
hi  i did paper clip test again  heres the results

92 cruise control o/c    i dont have cruise so this is normal i take it

96 egr valve     mine is blocked off at valve but pipe hanging loose not capped.   is this ok???

34  injector timing out of range  . What  governs this ?? is this bad news??



Any ideas welcome thanks


Phil


92 - normal
96 normal if egr disabled

34 - not good.  might be worth checking chain hasn't jumped, or pump drastically moved.  Not something I've done, but to check chains, sump and head have to come off according to the docs :o
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Grumpy old man

philglasgow

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Re: 2.5 td auto power issues
« Reply #11 on: 10 March 2009, 13:27:28 »
    oh dear   , at the moment im getting 17 to the gallon so somethings gotta give..



Thanks again for your speedy reply?


Phil :(
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TheBoy

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Re: 2.5 td auto power issues
« Reply #12 on: 10 March 2009, 15:40:14 »
make sure all the connectors to pump injection pump are secure, and that the connector from injector 4 is secure.
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philglasgow

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Re: 2.5 td auto power issues
« Reply #13 on: 10 March 2009, 16:25:01 »
the fault code 34 never flagged till i replaced the maf for a  new pierburg. ive unplugged and will see how it is and what it flags, ive contacted the maf supplier who wasnt sure this was relating to fault, but  he suggested i check with a stealer   and go on their recommendation  .

cheers

Phil
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philglasgow

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Re: 2.5 td auto power issues
« Reply #14 on: 12 March 2009, 10:16:56 »
Guys

As the paper clip test thru up   34 injector timing out of range!

My local diesel expert said the pumps on its way out , can anyone  advise if its possible for the timing to shift  as i certainly havent touched it, can this be adjusted ??  although a few weeks back i did an oil change but didnt touch pump.

Its an old 1998 car so a new injection pump is false economy, can anyone offer any advice here please as i dont want to  get rid  but ive did 3/5s of a tank and only covered 164 miles .and its crippling me financialy

Also    any knowledgable members near Glasgow I wouild be more than willing to pay for their time.


Thanks

Phil   :-/


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