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Discussion Starter #1
Hi folks,

I've got a 2006 1.8 TDCi with an intermittent acceleration issue.

When pulling away after starting from cold, the engine splutters and stutters a little for about 15 seconds and is rather lumpy for a few minutes after.

On general driving when fully warmed up, I frequently experience a loss of power, this is often when pulling away from stationary. The engine doesn't stall generally, although sometimes it will but usually you hit the accelerator and there's just no response. You bury the clutch and floor the accelerator and it appears to clear it.

On other occasions, when driving, if coasting along at an average speed and you then go to accelerate, again there is a loss of power sometimes.

Recent work on the car includes:

New Garrett turbo (changed because the old one had very worn & noisy shaft bearings)
New glow plugs
New air, oil & fuel filters
Oil change

I've cleaned the MAF meter and checked for error codes, there were none.

Before I changed the turbo and the glow plugs, I was getting an intermittent engine system error warning which cleared when you re-started the car. I've not seen it again since the above was carried out.

I wondered if the problem could lie with a throttle/accelerator position sensor or the equivalent for the diesel engine? Either that or a faulty injector?

Not sure if it's relevant but fuel consumption feels a little low to me. Best I can achieve is around 35-40mpg which for a diesel seems a little low to me.

Any help would be MUCH appreciated.

Many thanks in advance :)

Bob
 

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Hi

Hi,
injectors won't show codes unless electrical fault, you have to go by the smoke and you don't mention that.
A leak off test should show if any need changing. ( see that on you tube )
From work already done and symptoms, l would suggest checking for air entering the system, usually the quick release connectors fail and the pump sucks air in with the fuel.
lf you can fit a bit of clear pipe on the return line ( the thinner one on the o/s of engine ) you'll see if there are bubbles. l had this and
l replaced the connectors with 10mm pipe and clips cheap off ebay, until the bubbles stopped, the new pipes are expensive.
lt's a cheap fix, if that is the problem.
Let us know how you get on.
Bob.
 

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Discussion Starter #5
Thanks for the advice guys. Bob, can you give me a more specific location for this return pipe I need to check for air? I've not had the CMax long so not overly familiar with the engine bay layout yet. Is it just the pipe that needs replacing? Or do I need new quick release connectors (whatever they are!) too?

Thanks again,

Bob
 

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pipes

When you stand at the front, on the left hand side, up near the top where the engine mount is, you'll see 2 pipes coming into engine bay. The thicker one is the feed pipe from the tank, the thinner one is the return pipe.
Roll back the black outer sheathing on the return pipe, hopefully it's clear pipe and you can watch it while the engine's running, look for any bubbles.

For your symptoms this is worth checking.
lf you want to know the worst it could be, look up 'black blob' in the search button, see what l was up against.
Good luck
Bob.
 

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can't help really other than to say 1.8tdci is exactly the same as yours, when coasting up to a roundabout accelerating gently seems to have no effect at all, its as if the turbo is not kicking in or the accelerator sensors are not working, flooring the pedal gets you going. its quite unnerving nipping out at junctions as you accelerate but go nowhere.
 

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Discussion Starter #8
can't help really other than to say 1.8tdci is exactly the same as yours, when coasting up to a roundabout accelerating gently seems to have no effect at all, its as if the turbo is not kicking in or the accelerator sensors are not working, flooring the pedal gets you going. its quite unnerving nipping out at junctions as you accelerate but go nowhere.
Mine does exactly the same Paul. I've still not got to the bottom of mine, but the injectors are coming out next week and going to a specialist to be tested on their test rig. At least it'll either solve the issue or eliminate them so we can dig deeper.
 

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Discussion Starter #9
I note if I let revs drop too much and then go to accelerate, i get a shudder and the "Engine System Fault" warning comes up on the dash. If I restart the car, it vanishes. Most odd!
 

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Hi

l would have thought that if a message comes up, a fault code would be registered, probably intermittent.
Have you read the codes since, and are you now sure no air in system.
Bob.
 

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Hi does any 1 know where temp scensers are located on focus c max 17.98 2006 be great full if I cod get some help
 
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