Blinking MIL on....running rough.....where to start with repair?

[Aronis]

Here is the VAG print out.

11 Faults Found:
17887 - Brake Boost Vacuum System
P1479 - 008 - Mechanical Failure
17863 - Exhaust Gas Temp Sensor 1 (G235)
P1455 - 008 - Implausible Signal - Intermittent
17865 - Exhaust Gas Temp Sensor 2 (G236)
P1457 - 001 - Open or Short to Plus - Intermittent
16825 - EVAP Emission Control Sys
P0441 - 002 - Incorrect Flow - Intermittent
16840 - EVAP System
P0456 - 002 - Very Small Leak Detected - Intermittent
16684 - Random/Multiple Cylinder Misfire Detected
P0300 - 001 - - MIL ON
16688 - Cylinder 4
P0304 - 001 - Misfire Detected - MIL ON
16686 - Cylinder 2
P0302 - 001 - Misfire Detected - MIL ON
17748 - Camshaft Position Sensor (G40) / Engine Speed Sensor (G28)
P1340 - 001 - Incor. Correlation - Intermittent
16685 - Cylinder 1
P0301 - 001 - Misfire Detected - MIL ON
16687 - Cylinder 3
P0303 - 001 - Misfire Detected - MIL ON
Readiness: 0000 0001


I cleared them and went for a drive, light came back on....Looks like Camshaft Position Sensor is dying and causing the rest? What do you think?

Thanks,


Mike

(make me an offer LOL)

[DHall1]

SJP

Call me in the morning

Replace the ARP while you have the intake off

suction jet pump
after run pump

[Aronis]

I replaced the suction jet pump when we had the engine out, but not the after run pump.

Why do you suspect the Suction Jet Pump with those codes?

Thank you,

Mike

[lswing]

Hope it's not a cam adjust pad. You had those done a few years back though? Look at blocks 70-74, how do your cam adjust degrees look at idle? I have a few threads on the numbers and details.

Edit, blocks 91-93. http://www.rs6.com/showthread.php/32...ht=#post283409

[Aronis]

Thanks Iswing!

I drove it around a bit today, running fine but the MIL is on steady. I was going to scan again tonight. I will log 70 - 74 and let you know.

The Cam adjusters were replaced at about 127k miles (13k ago). If those failed I'll scream!

I am hoping that it was just a loose connection,after all the wires were plugged back in.

Mike

[DHall1]

Well crap

the vac leak causes all those assorted symptoms.

Clear codes and monitor which code comes first

[Bigglezworth]

Easy to tell if you have a vacuum leak under the manifold by spraying some MAF sensor cleaner down under the manifold. RPM's increase? You have a leak.

[nubcake]

Did really noone notice that all those misfires are from just one (passenger side) bank?
I agree that it does look like cam tensioner. Or could be the CPS indeed.

[Aronis]

Easy to tell if you have a vacuum leak under the manifold by spraying some MAF sensor cleaner down under the manifold. RPM's increase? You have a leak.

That is very interesting! Is it dangerous??
So the cleaner gets sucked in and gets burned, increases RPMs! Sounds like an easy first test for a leak!

Mike

[Aronis]

Thank you for the input, you guys are great!

The knowledge on this site is amazing.

I'll check the codes tomorrow and then log 91-93 (saw the edit) and post my results.

Thank again.

Mike

[Aronis]

I rescanned.



Brake Boost Vacuum System Mechanical Failure....The brakes feel fine, but perhaps this is the culprit? It is only effecting one bank (cylinder 1 to 4) Passenger side? Most misfires are in cylinder 1 and 2.



What do you make of block 8?



Ross Tech has this....

17887/ P1479/005241 - Brake Boost Vacuum System: Mechanical Failure

Possible Causes
Fuse(s) faulty
if the blade wheel (rotor) in the vacuum pump is stuck, most probably a fuse will burn
Hoses from/to Brake Boost Vacuum Pump faulty
Brake Boost Vacuum Pump faulty
the blade wheel (rotor) in the vacuum pump is stuck
Possible Solutions
Check / replace fuses
check if the blade wheel (rotor) of the vacuum pump is stuck, otherwise the fuse will burn again
Check Hoses from/to Brake Boost Vacuum Pump
Check Brake Boost Vacuum Pump
check if blade wheel (rotor) is stuck
Perform Output Test
Perform Short Trip in Basic Settings. Group 008 is commonly the self test for this system and may be activated Key On, Engine Off. If needed activate basic settings using [On/Off/Next] and pump the brake pedal.
Special Notes
When this fault is stored in conjunction with misfire and system lean fault codes check the PCV system and any other possible sources of engine mechanical vacuum leaks. Although PCV failure is most common on the 1.8T engines equipped with the auxiliary vacuum pump, any engine with low vacuum can cause that electric pump to run excessively - resulting in this fault code.



The phase adjustment numbers are High???



Can the vacuum leak explain that?

From what I have researched today the cam chains may be off? Example diagram from Ross Tech for V6



So?

1. Vacuum problem effecting only cylinder 1 and 2 (most misfires)? Unlikely.
2. cam position sensor? again, only effecting two of the four cylinders on that same cam shaft, unlikely
3. BAD coil packs? I still have all 8 originals as best I can tell? Were these supposed be replaced routinely? I will check my records again but I did not list them in my tracking spread sheet, possible but does not explain the huge variance in the Phase Adjustment numbers
4. Cam not aligned properly? Sounds possible but why is just cylinder 1 and 2 mostly misfiring?

Looks like more than one problem. Vacuum system leak and ?

Thanks for all the input.

Mike

[Aronis]

I did the "Short Trip test"

Engine off, block 8 under section 4 basic tests, heard clicking when the display said Pump On, clicked off, Clicked on, but did not hear any pump running. When I pump the brake pedal I can see the pressure number rise and fall as I pumped. Looks like the booster pump is is stuck/Dead.....

I could not yet find the location of it's fuse, working on that next. I think the click is the relay that turns it on so that is getting power at least.

Mike

[lswing]

Your bank 1 and bank 2 adjustment numbers are awfully high, not sure why. Here's a note on the numbers from another site, and ours side by side, you can see my adjustment at bank 1/2 is minimal, car runs like a charm. Makes me wonder if your bank 1 is off by a tooth?

Block 091 is bank 1 by itself.
Block 092 is Bank 2 by itself.
Block 093 shows how far from what is expected the cam is. In my case I had -3 and -4 in all conditions. This number did not change during any throttle inputs while driving.



Edit; Did you take your screenshot with pedal depressed, or is your idle that messed up at 1600?

[Aronis]

Sorry, missed the image at idle, I have 91,92...

[Aronis]

I did the brake test again after reading in the Bently Manual a bit more.

Failed. LOL

[nubcake]

93 looks out of whack.

[Aronis]

93 looks out of whack.

Exactly what I was thinking LOL

[SteveKen]

This all just happened all of a sudden and you didn't do anything prior to this?

I can't recall how hard it is to put the crank at TDC and see where the two diamond shaped ears are clocked.

You might have a bad tensioner guide or your timing belt pulley might have slipped on one of the cams.