Technical 2007 Fiat Ducato 3.0 fault code P0340

[panutt]

Hi. Some weeks ago I got the yellow engine lamp on dash. Code reader said P0340. Deletetd the code and move on. After a 5-6 faults, it starts works witout codes, but I want to change sensor anyway. . I ordered a new camshaft position sensor from Hella. Installed it, but engine will not start, sometimes ignite for 1-2 sek. So I think the new sensor was faulty. Innstalled the old sensor and engine starts fine. Ordred an expencive Bosch sensor. Same with tis one. Engine will not start. Code P0340 every time I try starting. (yes I have the OBD2 scanner). When I put the old sensor back, then the engine starts without problems. But ! : I tried the new Bosch sensor AGAIN, pressed the trottle pedal to the bottom, and yes, the engine starts. Idling fine, but with code P0340. So I drive it for a trip, but when home the starting problems still there. Now, I innstalled the olde sensor, and guess what. Even problems with the old one. Starting problems, starting sometime, some with code, some without code. What is wrong. Is it ECU that dont read/save the new sensor or similar? Someone understand something?

 

[panutt]

It is possible to have a worn chain and not hear rattle of tensioner working correctly and not yet reached end of its working limit.

Remember your engine has 2 chains subject to potential wear

Yep, I know. And as you said, if they have locked the crankshaft with the locking tool, they can check the chain slack on lower chain.
And when taking of the plastic cover over cam sprockets they kan see the upper chain....

 

[jackwhoo]

Yes, but what I have experienced after phone calls to other Ducato specialist workshops today, 8and there has been a lot) is that the sprockets is NOT of the floating type. That said, there should be impossible for the sprockets to rotate on the camshaft. (if not the guide pins, keys or other thing I cant imagine.

I understand, I have no experience of the specific camshafts in question.

 

[jackwhoo]

A quick Google image search for the specific camshafts shows your research is quite correct and the sprockets are not "floating" but are keyed to the camshaft using an unusual round "pip" on the camshaft mounting flange.

 

[panutt]

I understand, I have no experience of the specific camshafts in question.

Anyway, nice to discuss with you, and read your thougts. I will visit the workshop tomorrow morning and have a talk with them. Ask for all what we have discussed. They will presumably hate me when done.

 

[panutt]

A quick Google image search for the specific camshafts shows your research is quite correct and the sprockets are not "floating" but are keyed to the camshaft using an unusual round "pip" on the camshaft mounting flange.

Thank you. I wasnt able to find this myself. But then, IF the chain is worn out, Its the first time ALL of the Fiat Ducato spesialist workshop I have talked to, had heard about anything like this. BUT, of course, if the overhauled engine had run 4-500.000 km and they dident replaced the chain..... :-(

 

[jackwhoo]

I would check for any chain wear or bad timing or broken chain guides by locking the crank correctly then lightly turning the cam sprocket in reverse direction ( to tension both chains )
Looking where the cam locking slots end up.

I don't think they will hate you , fingers crossed they will appreciate your interest .

 

[panutt]

I would check for any chain wear by locking the crank correctly then lightly turning the cam sprocket in reverse direction ( to tension both chains )
Looking where the cam locking slots end up.

I don't think they will hate you , fingers crossed they will appreciate your interest .

I will ask, but so far, they HAVE locked the crankshaft, and the cam sprockets is NOT in position, where they should be. Another fun thing: Also when engine first starts, it runs like a dream. So I wonder....

 

[panutt]

I will ask, but so far, they HAVE locked the crankshaft, and the cam sprockets is NOT in position, where they should be. Another fun thing: Also when engine first starts, it runs like a dream. So I wonder....

Thanks anyway. And when all is repaired, I will post what they found.

 

[Techmani]

Workshop finnsished the troubleshooting on the engine. They say it is a timing problem, and want to change the timing chain. Engine must out of vehicle....Mecanics have locked the crankshaft in position and the camshaft sprockets is´nt in their place (out of timing). Is there anyone who nows for shure if the camshaft sprockets are of the floating type, without a key. If so, locking crankshaft and install timimg tool on crankshaft, and loosen nut on sprocket/camshaft and re-time will soolve the problem?

Hello, did you manage to get the problem, P0340 code resolved and how as I have same issues

 

[panutt]

Hello, did you manage to get the problem, P0340 code resolved and how as I have same issues

No ! The engine was a overhauled by "a professional workshop" and installed by ordinary car worshop in November 2022. This worshop has take over the responsibility for repairing the engine/problem. That said, the mechanics didnt manage to take of the pully fromm the crankshaft.... and no one beleive it can be a worn timing chain. Now, the car will be sent to another spesialiced workshop for extended troubleshooting. That said, In my thoughts there could be at least four cases: 1.Streched timing chain, worn out. 2.Bad wiring 3. Faulty ecu. 4. the sprocket on crankshaft has loosened and twisted somehow.... I cant see any other possibilities.

 

[panutt]

Problem solved. The mechanics starts over again, first removed the pully from crankshaft and find the timing out of limit. They have now removed the engine from the car, and yes....a worn out timing chain !! (and that, on a complete overhauled engine???)
The engine are repaired/new chain, and I will have the car back in next week.