Hi,
My Focus TDCi loses power under load...
- up hills
- along flat straights
- on twisty roads
- any time when power / boost is being generated.
No warning lights or fault codes.
AIR FLOW SENSOR?
THROTTLE POTENTIOMETER?
EGR VALVE?
Would be forever grateful for any advice.
Cheers,
Martin
Edited by Dynamic Dave on 26/09/2009 at 13:57
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Smarty
Start with the basics.
Is it diesel in the tank - or some awful concoction?
When was the fuel filter last changed?
Does it smoke under load?
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I have the same problem on mine, a 2004 focus TDCi 115 as well. NO fault codes at all. 2 years ago they found a snapped wire from the MAF sensor to the throttle potentiometer and it was fine...for a few months. I bet it doesn't smoke...first of all the catalyzer absorbs most of the soot anyway...but i think this problem is a perennial one on this model. Forget anything mechanical in my opinion. It's just some dodgy electronics. My local agent argues that there is no problem given that there is no fault code. If the fault is intermittent there is a good chance nothing will show up eventually since the ECU is programmed to erase most fault codes if for a certain pre-programmed interval, say, 100 km, nothing out of norm is detected.
This Tuesday I am booked at an independent specialist since the local agent has practically given up. I shall keep you posted.
PS - After less than 3 years (I was lucky it was still under warranty for a couple of weeks), it started erratically and even turned off due to weak idling. They diagnosed the dual-mass flywheel gone wrong. The bill (had I been obliged to pay) turned out to some £2k!
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No mechanic needed...just removed the connection from the ECU to the common-rail, sprayed some contact cleaner (stuck the performance chip from my Clio dCi - yes they DO fit) and the problem just disappeared!! I ran it for a whole week with the engine never missing a beat. I shall soon remove the chip and retest to see what cured it - although I strongly doubt it was the chip that fixed it!
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