Help - 2002 Audi A3 1.8t Quattro ARY engine code - Rough Idle - Fault code P1340 - Help

[mumutley]

Hi All

Help - 2002 Audi A3 1.8t Quattro ARY engine code - Rough Idle - Help

A few days ago the tick over started fluctuating between 700rpm > 1200rpm and very rough - when driving above 2500rpm all seems good

Checked fault codes with Vagcom - P1340 Camshaft position sensor - Engine speed sensor - Incorrect correlation?

Checked cambelt timing all OK
Checked internal cam chain drive all OK

Replaced camshaft sensor - fault still there
Replaced crankshaft sensor - fault still there

Carried out oil and filter change - incase the oil pressure was affecting the internal cam chain tensioner - fault still there

Anyone got any ideas please?

Thanks

[mumutley]

Update been out to the car and it would not start!!
Checked fault codes and P1340 present!!
Clear code engine started and ran OK for a few seconds then the lumpy tick over returned
Drove the car round the block checked fault codes now I have:
(16725) P0341 Camshaft sensor implausible signal ?
(17748) P1340 camshaft position sensor / engine speed sensor - inco correlation
(16684) P0300 random multiple cylinder misfire detected
(16685) P0301 cylinder 1 misfire detected
(16686) P0302 cylinder 2 misfire detected

It looks like my poor car as going from bad to worse, please HELP

[Crasher]

Your sump pick up is blocked, stop running it or you will kill the turbo and then the engine, if you haven't already.

[mumutley]

Many thanks Crasher

Your sump pick up is blocked, stop running it or you will kill the turbo and then the engine, if you haven't already.

Sugar - OK thanks I will be busy this evening to then. Do I need any special tools to remove the sump?

A quick question though, how does this cause the fault/faults I am seeing? (I am just curious as to why)

[mumutley]

Hi @Crasher / All

Sump removed cleaned, oil pick up removed cleaned, pick up refitted, sump refitted. Clean new oil and filter
Start up left to run for 10>15 minutes same fault codes present:

Checked fault codes and P1340 present!!
Clear code engine started and ran OK for a few seconds then the lumpy tick over returned
Drove the car round the block checked fault codes now I have:
(16725) P0341 Camshaft sensor implausible signal ?
(17748) P1340 camshaft position sensor / engine speed sensor - incorrect correlation

Removed valve cover, inlet camshaft, cam chain, cam chain tensioner. Installed new cam chain and tensioner

Startup left to run for 10>15 minutes, same fault codes present:

Checked fault codes and P1340 present!!
Clear code engine started and ran OK for a few seconds then the lumpy tick over returned
Drove the car round the block checked fault codes now I have:
(16725) P0341 Camshaft sensor implausible signal ?
(17748) P1340 camshaft position sensor / engine speed sensor - incorrect correlation


Could it be there is a fault with the oil pump??

Please any help / suggestions

[Crasher]

You need to check the oil pressure at idle, I suspect you have damaged crank bearings, I have seen this a lot on the 1.8T and now we are seeing it on the 2.0T, twice last week alone, I have a 2012 TT 2.0T sitting at work ready for next week, low oil pressure caused the turbo to snap its shaft.

[FrenchAudi]

I seem to be hearing about more and more problems possibly related to 1.8T oil pickup problems.

I'm in the process of fitting an oil pressure gauge - don't know why so few cars seem to have them.

mumutley, could you please post your current mileage and what oil change interval you follow?

[Crasher]

For some odd reason it is more of a problem on the longitudinal installation engines than transverse, I can’t decide if it is air flow related or the shallow rear surface as that does seem to be where the sludge is generated but changing the oil every 9000 miles and using the best money can buy seems to stop it occurring.

[FrenchAudi]

For some odd reason it is more of a problem on the longitudinal installation engines than transverse, I can’t decide if it is air flow related or the shallow rear surface as that does seem to be where the sludge is generated but changing the oil every 9000 miles and using the best money can buy seems to stop it occurring.

Fingers crossed then. I'm using fully synthetic Shell Helix Ultra 5W40, and from now on intend changing the oil and filter every 8,000 km (5,000 miles), which for me is about once a year.

Changes so far have been made at 7,000, 5,100 and 4,400 miles.

[Crasher]

I do mine and Mrs Crashers once a year (both a 1.8T) and use Quantum Longlife which is now made by Fuchs, I do barely 3k and her about 5 and both engines are spotless inside the sump as I also use a probe.