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Old 12-13-2012, 04:14 PM   #1 (permalink)
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Bizarre running problem

Its a long story!!!!

Hope some of you can help with my problem, my 07 300 has got a oil leak that I cannot find, and my mechanic also cannot pin point the leak, so 2 days ago he was trying to find the most obvious place, I have had the new seal and pipe fitted already being worried about the swirl failures, anyway he removed the guard on the turbo to check the turbo and thought it could be the sensor next to the turbo ( not sure what it is, looking at the engine it's on the right side of the turbo just where the guard has a cut out, 3 wires coming out of it, I think it's back pressure sensor? ) as it had a lot of oil on it, he removed the plug and sprayed a cleaning solution on the area and wiped down as much as possible, he replaced the plug and covers and said run it and we will look again in a couple of days and see if the leak shows itself? Any way driving home this is where the fun starts!

The car stopped on the way home and it kangarood a bit just before as if I was taking my foot of the pedal. It started straight up and was fine going home. Later staring work I had a right problem getting the car to run but then all of a sudden everything was fine again.

Yesterday the car was ok working but on a run to Manchester it felt a bit under powered, no limp mode just not as positive as normal, anyway got back ok and had a rest for an hour then went on another run and the car was really struggling to run smooth at all, any pressure on the pedal and it just started juddering, so I finished as soon as I could.

Today been to the garage and his code reader had about 20 fault codes,all various fuel, pressure, dpf levels sort of stuff. He replaced the fuel filter which left the car still feeling sluggish and driving it hard it's ok but soon as you get to 70mph cruise speed about 18-21,000 rpm zone where it's not hard accelerating, the car starts juddering like crazy. I've been back at the garage and he cleared all codes and it seemed to be fine, a lot smoother again like a different car, but now it's started to happen again. My mechanic is great but not a 300 specialist, he says he can read the data but a lot of the time the codes only say what sensor is faulty not why and what is faulty.

It's a bit long but please has any one ideas?
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Old 12-13-2012, 04:21 PM   #2 (permalink)
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If it is the back pressure sensor it should have a tiny hole in the centre and that can get blocked from all the crud that passes through, get your man to have a look and clean it out or replace it... What were all the codes you had? It might help us find the source
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Old 12-13-2012, 05:01 PM   #3 (permalink)
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Personally I would inspect all wires the wiring looms around the top and sides of the engine bay for signs of rubbing and bare conductors. There quite a few areas on 300C's where cables have been found damaged previously and cause all sorts of problems. It is also important that every trouble code is noted as an aid to fault finding.
If your mechanic hasn't made a note of every code for you I wouldn't be very pleased.

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Old 12-13-2012, 05:55 PM   #4 (permalink)
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No he didn't record any codes.

I have ordered a code reader tonight to make life easier, also some resistors just in case for the swirl motor. The only part he touched was the sensor, and I am convinced it must be related to that. He squirted gunk or something on the whole area including filling up the sensor. I do not believe in coincidence, it was literally perfect ( apart from the oil leak ) and then a completely bad drive after he had done it. Also that's all he did, it's not like he messed about with lots of things.

Is that the correct name of that sensor also.

Will have a check also of the wires around the engine in daylight tomorrow.

Thanks
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Old 12-14-2012, 03:48 AM   #5 (permalink)
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Check the wiring hasn't rubbed through on the air con pipes beside the engine, when they wear through they throw up loads of different codes. The EGR is to the right of the turbo (black box with about 3 wires) bolted to the intake manifold.
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Old 12-14-2012, 04:14 AM   #6 (permalink)
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Quote:
Originally Posted by john2195 View Post
No he didn't record any codes.

I have ordered a code reader tonight to make life easier, also some resistors just in case for the swirl motor. The only part he touched was the sensor, and I am convinced it must be related to that. He squirted gunk or something on the whole area including filling up the sensor. I do not believe in coincidence, it was literally perfect ( apart from the oil leak ) and then a completely bad drive after he had done it. Also that's all he did, it's not like he messed about with lots of things.

Is that the correct name of that sensor also.

Will have a check also of the wires around the engine in daylight tomorrow.

Thanks
Yes the sensor in the location you describe is the "EGR back pressure sensor" which if faulty can sometimes throw up the P0401 "EGR insufficient Flow" error code, amongst others.

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Old 12-14-2012, 10:42 AM   #7 (permalink)
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Been pretty busy but had a look round before it got too dark, yes the wires that go behind the air con pipes in front of the EGR look like they have worn a bit, I sprayed a little wd40 around and a little smoke came off, not a good sign??

I guess it a matter of cutting open the area and checking each wire and insulating is the best way?
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Old 12-14-2012, 11:35 AM   #8 (permalink)
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Quote:
Originally Posted by john2195 View Post
Been pretty busy but had a look round before it got too dark, yes the wires that go behind the air con pipes in front of the EGR look like they have worn a bit, I sprayed a little wd40 around and a little smoke came off, not a good sign??

I guess it a matter of cutting open the area and checking each wire and insulating is the best way?
Yes, that's probably the problem.
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Old 12-14-2012, 05:24 PM   #9 (permalink)
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Quote:
Originally Posted by john2195 View Post
Been pretty busy but had a look round before it got too dark, yes the wires that go behind the air con pipes in front of the EGR look like they have worn a bit, I sprayed a little wd40 around and a little smoke came off, not a good sign??

I guess it a matter of cutting open the area and checking each wire and insulating is the best way?
Yes just cut back the insulation binding and inspect and insulate each wire if necessary.
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Old 12-17-2012, 04:31 AM   #10 (permalink)
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Had a good poke with the wires now, I had 5 wires in total that were damaged, 1 of which had rubbed apart. I insulated them all and wrapped up the loom again. I have only run the car a little bit and it is still a bit dodgy, but I am guessing I need to see my man and get the codes all cleared out. Going to see if it betters itself without the codes cleared to save a visit to the garage.
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