Cmax 04 1800 pet cutting out at junctions - Ford C-Max Forum
 
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post #1 of 9 Old 06-05-2012, 12:36 PM Thread Starter
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Cmax 04 1800 pet cutting out at junctions

Hi there I've got a 04 1800 petrol zetec and when I come up to junction and dip the clutch the revs drop down to 500 revs and cuts out or nearly cuts out any ideas cheers
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post #2 of 9 Old 06-13-2012, 03:49 PM
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mine drops to about 850rpm at junc but dosent cut ..yet! tho its abit lumpy ticking over..has it been serviced recently

2004, 1.8 Zetec Panther Black 60k+ happy miles so far.
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post #3 of 9 Old 06-19-2012, 12:17 PM
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I have an 08 1.8 zetec & occasionally it does virtually the same thing when coming to a junction, but mine sometimes does cut out... Be interested to know if this is a common experience
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post #4 of 9 Old 06-25-2012, 07:52 AM
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I had exactly the same problem, there is a small pipe under the inlet manifold (can't remember the name of it) this pipe splits and causes the problem. If you spray some wd40 or similar between branches 3-4 of the manifold while the engine is running it should rev up if it does the pipe has gone. Good new is its a cheap fix but a bugger to fit. I found out the name of the pipe from this forum so just do a search and you should come across it
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post #5 of 9 Old 07-21-2012, 10:30 PM
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I had a similar problem with my Mazda 6 stalling at junctions, or whenever the clutch was pressed while the car was moving. Cleaning out the throttle body and (very carefully) cleaning the MAF sensor seemed to cure the problem for me.

More info here : Mazda 6 - 2l petrol Mazda 6 stalling at junctions | Technical matters | Back Room Forum | Honest John
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post #6 of 9 Old 07-30-2012, 09:59 PM
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@Beaverbeavo

I think the pipe you referring to is from oil separator.

One side goes to PCV valve and the other to inlet manifold.
I know cause i have just removed my manifold- what a pain in ass!

The pipes seems to be causing problems when it splits, however i have heard the revs go up rather then down when that happens...

I have inspected the pipe on mine and it seemed OK.
I am sure i have reconnected it properly.

I have cleaned the inlet manifold + throttle body. Put everything back and now my C-max suffers from 'throttle hang'.
For the first two minutes from starting the car every time i depressed the clutch the revs jump to 1500-2000 rpms for about 2-4 seconds...

It stops after two minutes and car continues fine.

Any ideas what may causing that?

04 C-Max Mk1 1.8LX Duratec HE 120 hp(engine code: CSDA) - written off by BMW driver
New 04 C-Max 1.8 Ghia Duratec HE 120 hp (engine code: CSDA) Mods: C-max Mk2 rear lights,
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post #7 of 9 Old 07-31-2012, 06:32 AM
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Hi lestat
When you removed the inlet manifold did you disconnect the battery?
As the ecu has a learning sector called the kam keep alive memory
This allows the ecu to save data about idle and fuel! This would have been reset if you remove the battery! And it will relearn.
From what you are experiencing it sounds like the cold start function of the ecu as modern cars dont have a choke the ecu ups the revs on cold starts

CMAX 05 reg
2.0 tdci ultima
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post #8 of 9 Old 07-31-2012, 07:44 PM
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@crash19999

Thanks for the quick response!

Yes, i did remove the battery completely before all other works.
I have heard about the ecu relearning stuff and i am still hoping this is going to stabilize finally at some point...

however i have just noticed the revs do not go to normal even after 2mins as i posted previously...after 2 mins they still hang above idle 850 ish rpms, roughly at 1200-1300 rpms when coasting when clutch fully disengaged... only when i stop completely the revs go to the idle 850ish when clutch disengaged...
tbh at this point i am confused what is the correct behavior.
unfortunately no other car in the household to compare against

Will post as soon as situation changes or i find the solution.

Regards.

04 C-Max Mk1 1.8LX Duratec HE 120 hp(engine code: CSDA) - written off by BMW driver
New 04 C-Max 1.8 Ghia Duratec HE 120 hp (engine code: CSDA) Mods: C-max Mk2 rear lights,
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post #9 of 9 Old 07-31-2012, 07:59 PM
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When you are coasting with the clutch depressed the revs will stay a fraction higher than when stationary as the ecu is anticipating you selecting gear and continuing drive its away to stop harsh gear changes and to stop stalling!

CMAX 05 reg
2.0 tdci ultima
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