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Stll got hunting problems with me TDCi


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#1 tdci stevie

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Posted 01 November 2009 - 06:50 PM

Ongoing problem ive got here sorry bout all the posts..
2004 2.0TDCi 103bhp 60,000miles.
full service 2,000 miles ago.
auxilary tensioner pulley and auxillary belt changed 400 miles ago.
bottle of wynns injector cleaner E.C.U reset and changed to shell diesel 200 miles ago.....!
EGR cleaned and MAF checked all nice and clean.
Have put it on a diagnostic hand held no DTC's present nor pending.
Problem is when on idle the engine hunts around and below the 750 r.p.m, when i have lights, wipers and blowers on it gets worse?
only happens on idle, runs lovely when driving plenty of power, drives really smooth.
Its only on idle this happens and if the Idle spped is sitting on 800 r.p.m when cold its good no problems.........?
Please and thankyou in advance to any one who can help or suggest the answer to my cars hunting idle problems.......?

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#2 chris bowman

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Posted 09 November 2009 - 09:57 PM

Ongoing problem ive got here sorry bout all the posts..
2004 2.0TDCi 103bhp 60,000miles.
full service 2,000 miles ago.
auxilary tensioner pulley and auxillary belt changed 400 miles ago.
bottle of wynns injector cleaner E.C.U reset and changed to shell diesel 200 miles ago.....!
EGR cleaned and MAF checked all nice and clean.
Have put it on a diagnostic hand held no DTC's present nor pending.
Problem is when on idle the engine hunts around and below the 750 r.p.m, when i have lights, wipers and blowers on it gets worse?
only happens on idle, runs lovely when driving plenty of power, drives really smooth.
Its only on idle this happens and if the Idle spped is sitting on 800 r.p.m when cold its good no problems.........?
Please and thankyou in advance to any one who can help or suggest the answer to my cars hunting idle problems.......?


check battery and alternator. could simply be that lights wipers etc are drawing to much juice and either the battery isnt too good or the charging circuit isnt supplying enough juice to cover these accesories. is the alternator light staying on or perhaps even glowing dimly?

#3 tdci stevie

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Posted 10 November 2009 - 09:53 AM

Battery is ok, no lights showing not even faintly...?
Since using shell diesel has improved the hunting (DOESNT HAPPEN ALL THE TIME AS BEFORE) but not got rid of hunting 100%
It idles smoothly at 800 rpm or just below 800 rpm (say 775rpm etc)
BUT when it drops it drops it goes as low as 716rpm-750rpm as recorded on live data test.! Thats when it makes the engine hunt :unsure:
Could this be an E.G.R problem but not showing a D.T.C up...?

#4 chris bowman

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Posted 10 November 2009 - 09:45 PM

Battery is ok, no lights showing not even faintly...?
Since using shell diesel has improved the hunting (DOESNT HAPPEN ALL THE TIME AS BEFORE) but not got rid of hunting 100%
It idles smoothly at 800 rpm or just below 800 rpm (say 775rpm etc)
BUT when it drops it drops it goes as low as 716rpm-750rpm as recorded on live data test.! Thats when it makes the engine hunt :unsure:
Could this be an E.G.R problem but not showing a D.T.C up...?


have same model same year and same mileage though mine has chain rather than timing belt. ihad stutter at 2000 revs but no probs with idle.
i cleaned the egr and that cured the problem. if ure egr is near the front of the engine on the left it will take less than an hour to clean yourself and put back on. well worth a try and possible it will cure ure problem. shell far excedes the euro standard for fuel whereas all the others only just achieve it. it is the best by far and if u have to use anything else add a tank treatment additive such as forte. this will help ensure clogging in areas such as the egr does not happen.

#5 tdci stevie

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Posted 11 November 2009 - 07:47 AM

Mine is also Timing Chain, its the auxliary alternator belt & tensioner ive changed.
Will look into this EGR... have cleaned it back in July this year when i purchased it maybe i didnt do a good job? or maybe its all the supermarket fuel ive used since july have covered about 5000 miles since...? :unsure:

#6 chris bowman

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Posted 12 November 2009 - 03:23 PM

Mine is also Timing Chain, its the auxliary alternator belt & tensioner ive changed.
Will look into this EGR... have cleaned it back in July this year when i purchased it maybe i didnt do a good job? or maybe its all the supermarket fuel ive used since july have covered about 5000 miles since...? :unsure:


clean that egr till it shines inside!
the manifold it bolts onto is also quite easy to take off and clean.

#7 click cluck

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Posted 09 March 2010 - 08:52 AM

Why bother about this low ( 750 ) idle - If everything fine at 800 - idle at 800!!? - mine idles at 800 ( 2l tdci 130 ) but is rough even then - smooths out once it gets going.

#8 artscot79

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Posted 09 March 2010 - 07:28 PM

Why bother about this low ( 750 ) idle - If everything fine at 800 - idle at 800!!? - mine idles at 800 ( 2l tdci 130 ) but is rough even then - smooths out once it gets going.



the heated screens front and rear are what are called high drain circuits they use a lot of juice withthe car idling these switches are provided with only the current from the battery so when you idle it gives the feeling its hunting its not though its a normal situation when you accelerate the alternator kicks back in and all the electrics are running as they should be simply put at idle the alternator is turning at it lowest speed giving the minimum output when you accelerate the alternator turmns faster to the higher output.

simply if it only does it at idle stoppingf at lights then waht you have is normal the fords are low revving engines many cars run at a higher idle speed 900rpm to compensate for this effect fords dont so its more noticeable than on another car. ive test driven many fords and they are all the same the ford engines particularly zetec were not great at idle speed and low revs hence why ford used dampers and hydraulic mounts to try and hide it

#9 tdci stevie

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Posted 10 March 2010 - 09:42 AM

Yeah sounds about right.
At lights normally ok, it when im idling in trffic for say more than a minute or 2 then it happens... soon as pull away its fine.
I thought it may be E.G.R related as to sitting idling a while.
Just ford for you then, cheers mate.

#10 artscot79

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Posted 10 March 2010 - 08:51 PM

Yeah sounds about right.
At lights normally ok, it when im idling in trffic for say more than a minute or 2 then it happens... soon as pull away its fine.
I thought it may be E.G.R related as to sitting idling a while.
Just ford for you then, cheers mate.



yeah its a ford thing mate just down to the low idle on fords all cars do it but there idle speed is higher to even it out so you dont notice you get used to it

#11 chris bowman

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Posted 11 March 2010 - 08:01 AM

i dont think any 16 valve engine diesel or petrol likes sitting in traffic on idle anyway.

#12 artscot79

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Posted 11 March 2010 - 06:52 PM

i dont think any 16 valve engine diesel or petrol likes sitting in traffic on idle anyway.



no they dont isnt an issue with 8 valve units but 16v units dont like it nor does it help ford set the idle so low for emission purposes

#13 tdci stevie

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Posted 15 March 2010 - 06:57 AM

Had another inspection of the EGR yestertday and while cleaning it i noticed the black hose/pipe had a split in it so taped it up put all back, and when i was tighting the inlet manifold to EGR 2 bolts down one of them snapped, so off to fords today to see if can get a replacement bolt.
If this split was the cause of my hunting will post as soon as the bolt on and test driven.

#14 chris bowman

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Posted 15 March 2010 - 04:02 PM

if this is the big hose it will cause warm air to get to the turbo which affects the efficiency of diesel burning. u get black smoke when u put ure foot down which is unburnt diesel.

#15 artscot79

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Posted 15 March 2010 - 04:58 PM

if this is the big hose it will cause warm air to get to the turbo which affects the efficiency of diesel burning. u get black smoke when u put ure foot down which is unburnt diesel.



trust me youll replace the whole engine and never change the hunting its a design characteristic of the zetec engine which is why on the newer models etc the idle speed was increased to 850rpm to flatten the effect out ive seen people replace idle control emidssion pipes egr valve pcv valve maf air filter throttl;e body coil pack leadfs plugs etc etc etc yet every car ive ever driven at work thats a ford zetec has the exact same charecteristic some better/worse than others

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