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Author Topic: Loss of acceleration (tractor)  (Read 3080 times)

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Flicc

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Loss of acceleration (tractor)
« on: 12 July 2007, 20:21:29 »
My 2.5 diesel will accelerate quickly  :y up to 75 mph (4000 rpm) then will not increase speed unless I accelerate gently but then it won't go over 95 mph! Any ideas what I should be fixing? I don't want to use the car's top speed but I do need to rely on it getting up to speed when I want it to!
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TheBoy

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Re: Loss of acceleration (tractor)
« Reply #1 on: 12 July 2007, 21:08:44 »
Check fuel filter (near expansion bottle) as a first port of call.  Some diesel injector cleaner as well.  Has it been serviced properly - remember its a 4.5k MAX service interval....
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Flicc

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Re: Loss of acceleration (tractor)
« Reply #2 on: 12 July 2007, 21:15:06 »
Thanks. I have just run through a bottle of injector cleaner but I will check the fuel filter next.
I have heard there is a vacuum pipe to the auto box. Could that affect the problem?
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TheBoy

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Re: Loss of acceleration (tractor)
« Reply #3 on: 12 July 2007, 21:23:34 »
Quote
Thanks. I have just run through a bottle of injector cleaner but I will check the fuel filter next.
I have heard there is a vacuum pipe to the auto box. Could that affect the problem?
No vacuums to autobox.

The fuel filter should be changed regular, and have the water drained very regular (hence the drain on bottom of filter) - diesel tends to trap water, and water will badly score the injectors...
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Kevin Wood

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Re: Loss of acceleration (tractor)
« Reply #4 on: 13 July 2007, 09:14:47 »
Haven't still got the plough on the back, have you? That tends to make 'em sluggish!  ;D

Sorry. Just noticed your location and it brought back some memories. I used to be a member of the gliding club at Wormingford when I was at uni in Colchester '89-'92.


Kevin
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Flicc

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Re: Loss of acceleration (tractor)
« Reply #5 on: 21 July 2007, 12:16:08 »
Thanks for that comment. I wondered what the clanking noise was! :-/ Perhaps I should change my name to Mr Plow?  ::)

Anyhoo ... I have changed the fuel filter but I still get this sudden loss of acceleration. Could happen anytime above 3500 rpm but is not predictable.
Anybody got any ideas on what I should check next?  :(
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Re: Loss of acceleration (tractor)
« Reply #6 on: 21 July 2007, 20:22:57 »
Quote
Thanks for that comment. I wondered what the clanking noise was! :-/ Perhaps I should change my name to Mr Plow?  ::)

Anyhoo ... I have changed the fuel filter but I still get this sudden loss of acceleration. Could happen anytime above 3500 rpm but is not predictable.
Anybody got any ideas on what I should check next?  :(
Inlet hoses tight, not leaking under boost?
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Flicc

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Re: Loss of acceleration (tractor)
« Reply #7 on: 14 August 2007, 19:58:07 »
More to add, I have been towing a trailer with a good load (1/2 tonne+) and I still get the symptom of losing acceleration but this time it was at low speed (40 mph) going uphill out of a Welsh valley loaded. Lots of power for 5 secs. then no more! Does anyone think I have a problem with my low pressure fuel pump?
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Re: Loss of acceleration (tractor)
« Reply #8 on: 14 August 2007, 20:08:06 »
Omegatoy is the man, but worth checking the inlet for leaks, and check the EGR is OK.
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Flicc

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Re: Loss of acceleration (tractor)
« Reply #9 on: 14 August 2007, 20:20:30 »
You're talking to someone who learnt cars before they had overhead cams! :-? What's an EGR?
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Re: Loss of acceleration (tractor)
« Reply #10 on: 14 August 2007, 20:23:30 »
Quote
You're talking to someone who learnt cars before they had overhead cams! :-? What's an EGR?
Exhaust Gas Recirc - an emission thing so that on cruising, it lets exhaust gases (inert) back into inlet, thereby in effect reducing cylinder capacity.

On TD, EGR valve is on front of inlet - the bit behind the large rubber pipe behind the 'Turbo Diesel' plastic. It has a small pipe that goes in front of the engine to the exhaust manifold.
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Re: Loss of acceleration (tractor)
« Reply #11 on: 14 August 2007, 20:43:53 »
Try Forte diesel injector cleaner, but put it in the diesel filter, drain out the diesel in the filter housing first, add in the Forte and replace the filter. Run the engine as normal, this will clean the injectors alot more than sticking stuff in the fuel tank. Yes the engine will run fine on the Forte ;)
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Flicc

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Re: Loss of acceleration (tractor)
« Reply #12 on: 14 August 2007, 20:51:25 »
Lots to look at. Thanks for the tips guys. L8r. :)
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Omegatoy

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Re: Loss of acceleration (tractor)
« Reply #13 on: 14 August 2007, 21:07:12 »
sounds like the pump in the tank isnt keeping up with demand from the injector pump? when it hapens and you release the throttle does it then tke a few mins to run properly again?
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Flicc

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Re: Loss of acceleration (tractor)
« Reply #14 on: 14 August 2007, 21:19:50 »
It recovers quickly, within 3-5 secs and then will accelerate but slowly. :-?
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