Engine Ping

ANMVQ · 05-23-2016, 07:18 AM

vacuum leak will cause this also, lean condition with pull timing. I had this happen to me 09 also my it was my intake mani was leaking, re tightened it and it went away.

nis350 · 05-23-2016, 09:21 PM

where was the leak on the manifold?

I would think that vacuum leak would effect the idling as well.

Quote:

Originally Posted by ANMVQ

vacuum leak will cause this also, lean condition with pull timing. I had this happen to me 09 also my it was my intake mani was leaking, re tightened it and it went away.

Jhill · 05-24-2016, 01:42 AM

Quote:

Originally Posted by nis350

where was the leak on the manifold?

I would think that vacuum leak would effect the idling as well.

Not always. You would be amazed at how far modern cars can compensate now days. A big clue would be if you reset te ECM and ten it runs like crap. If the vacuum leak comes on slow and gets larger over time then the ECM can constantly compensate and in theory should throw a code for fuel trim out of spec but not always. A good example is vw 1.8t, they always crack at the PCV elbow and develop a leak yet no code and no obvious poor running. Disconnect the battery to work on something unrelated and next thing you know it won't run (starts and dies).

nis350 · 05-24-2016, 11:07 PM

we have reset the ECM and nothing really changed.

Other than the occasional engine pings during off idle, the car runs/idles fine.

Quote:

Originally Posted by Jhill

Not always. You would be amazed at how far modern cars can compensate now days. A big clue would be if you reset te ECM and ten it runs like crap. If the vacuum leak comes on slow and gets larger over time then the ECM can constantly compensate and in theory should throw a code for fuel trim out of spec but not always. A good example is vw 1.8t, they always crack at the PCV elbow and develop a leak yet no code and no obvious poor running. Disconnect the battery to work on something unrelated and next thing you know it won't run (starts and dies).

ANMVQ · 05-24-2016, 07:39 AM

Quote:

Originally Posted by nis350

where was the leak on the manifold?

I would think that vacuum leak would effect the idling as well.

Back bolt at the manifold, the one near the fire wall.

nis350 · 05-24-2016, 11:09 PM

did you have similar engine pings only under off idle condition?

How did you find the manifold leaks, smoke test?

Quote:

Originally Posted by ANMVQ

Back bolt at the manifold, the one near the fire wall.

05-23-2016, 07:18 AM	#1 (permalink)
ANMVQ A True Z Fanatic Join Date: Mar 2011 Location: Framingham MA Posts: 2,732 Drives: 2014 Q50 AWD Rep Power: 20	vacuum leak will cause this also, lean condition with pull timing. I had this happen to me 09 also my it was my intake mani was leaking, re tightened it and it went away. __________________ 14 Q50 AWD, ARK, ECUTEK (SEB), Takda,

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