Help diagnosing via DTC's

[Silk90]

16486 - Mass Air Flow Sensor (G70): Signal too Low
P0102 - 35-00 - -
17544 -
P1136 - 35-10 - Long Term Fuel Trim Add.Fuel,Bank1 System too Lean
16684 -
P0300 - 35-00 - random/Multiple Cylinder Misfire Detected

16690 - Cylinder 6 Misfire Detected
P0306 - 35-00 - Intermittent
16689 - Cylinder 5 Misfire Detected
P0305 - 35-00 - Intermittent
16688 - Cylinder 4 Misfire Detected
P0304 - 35-00 - Intermittent
16687 - Cylinder 3 Misfire Detected
P0303 - 35-10 - Intermittent
16685 - Cylinder 1 Misfire Detected
P0301 - 35-00 - Intermittent
16686 - Cylinder 2 Misfire Detected
P0302 - 35-00 - - Intermittent
17861 - Exhaust Gas Temp Sensor 1 (G235): Open or Short to Plus
P1453 - 35-10 - - - Intermittent
17536 -
P1128 - 35-10 - Long Term Fuel Trim mult.,Bank1 System too Lean
17538 -
P1130 - 35-10 - Long Term Fuel Trim mult.,Bank2 System too Lean




Does a new maf sound right...?

Car was running good until i hit a misfire while driving one day, began idling 800ish not nicely had a small shake to the car, stopped at advanced checked the plugs, plugs where all good, attempted troubleshooting coil packs although did not seem to find one to be faulty, by doing this it may have thrown a few misfires on cylinders which may have not had misfires though

Idea's or suggestions?

Thanks in advance

-Zac

[The_Jerbel]

A new MAF sensor and a new pass. side EGT sensor sound about right...

[Silk90]

A new MAF sensor and a new pass. side EGT sensor sound about right...

done today, no change....

would re-run codes although my monitor shit on me and my laptop is a mac :-\ (not supported)

any other ideas?

[RolledMySTi]

Have you pressure tested?

[The_Jerbel]

Clear the codes and see how it runs.

[Silk90]

replaced maf, cleared codes still runs like garbage, was unable to re-run codes though because my monitor went bad now (worst luck)

is there supposed to be 5 wires on the pigtail for the maf? ive got 4 and the place where the 5th pin fron the maf would go into the pigtai ls broken although there is no wire going to the 5th port, could this be my problem?

it has to be the maf in my opinion being as the maf code + the lean o2's, and i believe it showed something in common in betley between the maf and the EGT which also threw a code.....

Thanks in advance

-Zac

[Affinitive]

That fifth wire is for the Intake Air Temp Sensor incorporated into the MAF sensor, but most of the time (as in your case) Audi/VW uses seperate Air temp sensors, so only 4 wires hooked to the 5 wire sensor.

I would take a real good look at the plastic crankcase breather hose assembly. The 00 model S4's had the REALLY shity breather hose assemblies. Depending on where it may be broken, it would/could produce a massive vacuum leak.

C

[RogueStatus]

That fifth wire is for the Intake Air Temp Sensor incorporated into the MAF sensor, but most of the time (as in your case) Audi/VW uses seperate Air temp sensors, so only 4 wires hooked to the 5 wire sensor.

I would take a real good look at the plastic crankcase breather hose assembly. The 00 model S4's had the REALLY shity breather hose assemblies. Depending on where it may be broken, it would/could produce a massive vacuum leak.

C

x2. check this out,they tend to go on 00's frequently.

[The_Jerbel]

Even if that was the case, it certainly wouldn't cause a bad MAF and a bad EGT code...

[mholme]

I'd pressure test the car if I were you. The MAF signal too high can be caused by a boost leak, which could explain your lumpy idle. I like to pull the ECU while changing the EGT sensors. Get your VAG-COM up and running too, otherwise, you're flying blind

[Affinitive]

Vacuum leaks most certainly will cause false MAF faults and fuel trim faults. As far as leaking boost pressure type of problems, that would generally produce fuel trim boost leak faults as that would be an unmetered air leak and boost leak when developing boost. Unmetered air leaks and straight vacuum leaks can be a little decieving. Straight vacuum leaks will oftentimes produce both MAF faults and Fuel trim faults if the vacuum leak is severe enough. Unmetered Air leaks (leaks in the intake plumbing before the throttle) will often times only produce fuel trim faults. I would not suspect a boost leak mainly because there is no boost leak fault. These cars are pretty good about monitoring target and actual charge air pressures and there is not much tolerable difference allowed before faults start setting for charge air pressure leaks. Again, I would first suspect a considerable vacuum leak behind the throttle in terms of air flow. On a 00 model, the breather hose assembly routes all the to the front of the manifold next to the throttle.
Definitely get vagcom going again as stated. When you do, post what kind of g/s you're getting at idle and load and the fuel trim numbers as well.

C

[mholme]

I would not suspect a boost leak mainly because there is no boost leak fault. These cars are pretty good about monitoring target and actual charge air pressures and there is not much tolerable difference allowed before faults start setting for charge air pressure leaks.

I've had eleventy billion boost leaks and not one single charge air pressure code.

I'd still do a pressure test, it's cheap and easy and will save you a lot of guess work.

[The_Jerbel]

Vacuum leaks most certainly will cause false MAF faults and fuel trim faults. As far as leaking boost pressure type of problems, that would generally produce fuel trim boost leak faults as that would be an unmetered air leak and boost leak when developing boost. Unmetered air leaks and straight vacuum leaks can be a little decieving. Straight vacuum leaks will oftentimes produce both MAF faults and Fuel trim faults if the vacuum leak is severe enough. Unmetered Air leaks (leaks in the intake plumbing before the throttle) will often times only produce fuel trim faults. I would not suspect a boost leak mainly because there is no boost leak fault. These cars are pretty good about monitoring target and actual charge air pressures and there is not much tolerable difference allowed before faults start setting for charge air pressure leaks. Again, I would first suspect a considerable vacuum leak behind the throttle in terms of air flow. On a 00 model, the breather hose assembly routes all the to the front of the manifold next to the throttle.
Definitely get vagcom going again as stated. When you do, post what kind of g/s you're getting at idle and load and the fuel trim numbers as well.

C

It would take a HUGGGGE vacuum leak to throw a MAF code. I've never seen it happen personally. Also, VERY rarely does a boost leak throw a code unless it's massive. The deviation has to be by ~3 psi before it'll throw a code.

[Rated S]

Is the MAF rubber ring tightly fit inbetween the MAF housing and the airbox with both clips to hold them together. I'm missing mine at the moment (along with 1 clip) and those codes look the same as what I have right now minus the EGT Sensor.

[Jayco88]

Is the MAF rubber ring tightly fit inbetween the MAF housing and the airbox with both clips to hold them together. I'm missing mine at the moment (along with 1 clip) and those codes look the same as what I have right now minus the EGT Sensor.

My MAF is also missing the O-ring and the bottom clip and I don't have a DTC.

[Rated S]

My MAF is also missing the O-ring and the bottom clip and I don't have a DTC.

Maybe because your not Stage 3? I had been missing it since a long time, but the DTCs only came up when I went full Stage 3. I can't really explain it.

[Silk90]

will check the crankcase breather and boost leaks today, just got the new connector in for the maf......


i cleared my codes after replacing the maf and the only code that still came up was still low maf signal, and i do have the o ring and what not on the maf itself.

will post up results later.

thanks alot

-Zac