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Citroen C4 1.4 P0170 and P0011

Posted By darrenwrx Wednesday, March 07, 2012 10:09:27 AM
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darrenwrx
 Posted Wednesday, March 07, 2012 10:09:27 AM
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Hi,

I hope someone can help shed some light on this on-going saga I am stuck with.

I have a customers Citroen 2006/56 C4 1.4 (vvt) KFU engine code. Symptoms are a hesitation when pulling away from stationary with low engine revs during all engine temperature ranges, but is at its worst when the engine temp is low (stood overnight, or for a few hours). At its worst it will stall, but usually it just feels like a severe misfire/chugging that doesn't always cause a stall. It also struggles to accelerate at low RPM (25mph 4th gear for example, it holds back for a few seconds, coughs, and gets going) Having read the codes with my Solus Pro, I had 3 original codes, P1336/P0170/P0011.
Having changed the coil pack and the plugs I now have 2 reoccurring codes, and all the above symptoms are remaining. First is P0170-fuel injection system fault, and the other is P0011-VVT control stuck in high position. It can take a couple of days for the codes to reappear once cleared. I have carried out the following tests to date:-

Oil changed as part of service along with the plugs and coil as detailed above
Oil pressure test..........5.5 bar @ 3000rpm......changed pressure valve and housing, pressure is now 4 bar @ 3000rpm but problems remain
Timing.......................Checked with timing pins, all lined up correctly
Inlet manifold.............Removed, checked for blockages and damage but no problems found
VVT solinoid...............Replaced with new genuine part
Cam position sensor replaced.

It went to a Citroen main dealer for diagnosis and they advised the customer that they would need to have the timing checked and clean out the inlet manifold (both of which have been done) but have not given anything fresh to go on.

Anyone got any thoughts?

Thanks in advance for your time, but I am at my wits end with this one now.

Regards

Darren



Angus
 Posted Wednesday, March 07, 2012 11:05:59 AM
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Darren

If the cam is stuck fully advanced, then that will cause all your problems. Pinning the belt pulleys won't show that.

Have you measured the inlet vacuum?


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oldford
 Posted Wednesday, March 07, 2012 11:09:28 AM
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P1336 Crank/cam sensor range performance - That could mean problems with the distribution.
OR when the ecu is a Sagem S2000 - High misfire on several cylinders.
The last would be consistent with a lean mixture that will also generate a P0170.

What ecu make do you have?

What are the fuel trims on? At idle, raised idle and under load?

Wednesday, March 07, 2012 11:12:54 AM by oldford
darrenwrx
 Posted Wednesday, March 07, 2012 1:23:47 PM
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Hi Angus,

Thanks for your reply, I have not meassured the inlet vacuum, so will try that. Would you have any idea what kind of readings I should expect to find?

Darren
darrenwrx
 Posted Wednesday, March 07, 2012 1:31:09 PM
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Oldford,

The P1336 fault code is no longer present since changing the plugs and coil pack some time ago, its the other 2 fault codes that are re-occuring, P0170 and P0011. I may have to look at the cam position in relation to the pully though, as I had assumed that the timing pin would not have located if this were in-correct, so thanks for pointing that out to me.

Darren
darrenwrx
 Posted Wednesday, March 07, 2012 1:38:07 PM
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Oh, and the ECU is a Sagem S2000.

The P1336 code was described as misfiring on multiple cylinders as you said
K And R
 Posted Wednesday, March 07, 2012 1:48:09 PM
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Darren

. "Would you have any idea what kind of readings I should expect to find?"

Are you serious w00t

Kev.


"If you dont KNOW how it works, don,t try to test or fix it"
Angus
 Posted Wednesday, March 07, 2012 2:28:29 PM
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Kevin

You have to remember that a vacuum gauge isn't the first diagnostic tool people reach for these days. We used one every day in our youth, so know what to expect. Heck; we even fitted one as a dash gauge, so that we could monitor the engine full-time.



Darren

Don't know what your gauge is calibrated in; but no less than 13-15 in/Hg or around 0.45 bar (45kPa) absolute; minus 0.55 relative.

Compare to the MAP reading in live data; MAP sensor signal voltage should be 1.3 - 1.7v at idle, 0.8 - 1.2v at 2000 rpm.


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K And R
 Posted Wednesday, March 07, 2012 5:52:09 PM
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Angus

You are correctBigGrin but reaching for a Vac gauge should be a BASIC.

This is customer car after all.

Kev.


"If you dont KNOW how it works, don,t try to test or fix it"
Angus
 Posted Wednesday, March 07, 2012 6:26:02 PM
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Kevin

I wonder if today's trainers even mention them - let alone know just how much they can divulge.


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