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muggo

2.0 Tdci "surging" At Light Throttle

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My diesel Mondeo has just clocked up 140,000 trouble free miles.

Yesterday though, on a 300 mile journey, I noticed a problem I'd describe as surging.

On very light throttle, the power seems to come & go slightly. Sometimes it's bad enough for the rev counter to show a drop in revs too.

I've had this problem before & have posted a thread asking for advice but nothing useful was suggested. The intercooler hose isn't split.

Last week I had a "fuel service" including adding an additive to the fuel. I also had the fuel filter changed.

Power seems slightly down but i could be wrong here. MPG is 48-50 on a long run so it can't be that bad.

I've tried revving to max with a warm engine which kicked out some smoke but didn't solve the sensation I'm getting.

Could this be a problem with an injector? At 140k miles, is this to be expected?

Any advice gratefully received.

UPDATE

I've just been out & noticed lots of black smoke from the exhaust, most of the time (I must clean my back window!) Also noticeably down on power.

Will more fuel additive or an expensive diesel tankful help? Can I thrash it better?

Halfords who did the fuel service did a "before & after" emissions check but didn't give me the printouts as they usually do. Is this likely to be relevant?

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Looking further into this I see that the EGR is likely to be partially blocked.

I'll give it a go but I gather it should take about 45 mins to sort this. Is that about right? I can't afford to be without my car.

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Rather than get it to rev high once, you need to sustain a high rev for a longer period of time. Say 60-65mph in 4th gear rather than 5th. Minimum 15minutes, but the longer the better.

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Rather than get it to rev high once, you need to sustain a high rev for a longer period of time. Say 60-65mph in 4th gear rather than 5th. Minimum 15minutes, but the longer the better.

Sent from my iPhone using Ford OC

I did 290 miles at 60-80mph so it should have been clean & hot by then. Thanks for the reply though.

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UPDATE

I cleaned out the EGR which was very badly clogged up. However, it's still smoking & surging as before.

I'm going to take it for a thrash shortly, but does anyone have any suggestions about what to try next?

Many thanks.

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Maybe some fuel additive, like a ideal cleaner. Also make sure you are using premium fuel, not the standard stuff; this alone should make a difference. But again, you need to drive at a high revs, for a sustained amount of time. Motorway cruising for that distance wont always help; the high revs increases the temperature of the exhaust, burning any carbon build up.

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Could this be a problem with an injector? At 140k miles, is this to be expected?

Possible. can you get an injector leak off test done?

Halfords who did the fuel service did a "before & after" emissions check but didn't give me the printouts as they usually do. Is this likely to be relevant?

Possibly. If one, or more, injector(s) are leaking a little fuel when they shouldn't be, it will affect idle and low accelerator running most. Assuming an emissions test at idle, that might show something. The idle might sound uneven (not a constant speed).

In contrast, running at higher speeds/loads is probably less likely to be affected, so motorway running might be fine.

On the other hand, there are probably other things that it could be, such as partially blocked egr and leaks around the turbo.

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Thanks to all who offered advice but I think I've identified the problem:

I'm now getting poor economy, lots of smoke, surging, low power & a whooshing noise when accelerating, all of which point to a leaking intercooler/EGR hose. I've spotted a split just down from the EGR & have ordered a new one from eBay for £14.45.

I'll fit it on Saturday & hopefully have a trouble free trip to Devon on Sunday.

I'm hoping I can undo the bottom jubilee clip via under the bonnet as I don't have a ramp or axle stands to remove the tray. If not I'll struggle from underneath.

With my almost blocked EGR cleaned out & a non leaking hose, I'm hoping she'll fly! :D

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Hi Paul, sounds like the same problem as mine, would love to hear if it sorts your problem out, Brian

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UPDATE

After replacing the split EGR/Intercooler hose, it seems to have fixed the problem. Still plenty of smoke when accelerating hard but I imagine the exhaust must be full of unburnt fuel & a long journey should sort it.

Surging & continual smoke has gone anyway. Power restored & having a clean EGR valve should improve fuel economy. I'll update when I know more.

It was a bit tricky to remove the bottom hose jubilee clip without having a ramp, but using a 7mm socket on the clip sorted it. I removed the EGR valve to give me more room to work. Took about 75 mins in all.

Thanks to all that helped with this.

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I'd recommend a TerraClean to clear the engine and exhaust of the build up. Worked wonders on my Landrover Discovery

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I'd recommend a TerraClean to clear the engine and exhaust of the build up. Worked wonders on my Landrover Discovery

Sent from my iPhone using Ford OC

Thanks Sean

Not sure it's worth spending £144 or so on a 140k mile Mondeo.

I'm off for a 250 mile motorway trip tomorrow so the engine & exhaust will be nice & warm & hopefully burn off all the crap I've deposited in there recently.

Regards

Paul

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Thanks Sean

Not sure it's worth spending £144 or so on a 140k mile Mondeo.

I'm off for a 250 mile motorway trip tomorrow so the engine & exhaust will be nice & warm & hopefully burn off all the crap I've deposited in there recently.

Regards

Paul

OK. I see it might cost around £100 or so for a 2 litre diesel.

I'll still try an Italian Tune Up & intend to use Shell VPower Premium Diesel every few tankfulls.

The mileage I do means Premium Diesel would cost me about £75 extra a year if I used it all the time. If I use it 1 in 3 times it would cost as much as a Terraclean every 4 years. I can't see the car lasting that long...!

Cheers

Paul

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UPDATE

All seems relatively fine now. Performance is mostly back & economy is 48mpg on a long motorway run at 80mph.

Still get some smoke when accelerating hard & I think it has lost a little low down torque as I stalled it yesterday & that's unusual for me.

I'm still going to try VPower fuel & see what economy I got using a better fuel.

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UPDATE

I've now used a tank of Shell VPower super diesel & plan to stick with it.

It costs 5% more but gives me 5% more economy, lots more power & a much smoother drive.

I only have to touch the accelerator & she just takes off!

I imagine my emissions are much lower (no MOT worries) & it will only continue to get cleaner the more I use it.

What's not to like?

Many thanks to those who helped me in this thread. The least I can do is let you know the end result: an engine that feels like it has done 10k miles rather than the actual 141k.

Cheers

Paul

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Hi all, I've got an update on my focus 2.0l tdci mk 2.5, came back from Fords yesterday after a new Turbo control sensor & Maf sensor, she drives like a dream now & takes off like a rocket at the touch of the throttle, so not certain if I will blank the Egr value now, might wait & see how it feels after a few miles. Brian

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