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Something strange happening with my Q7

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Something strange happening with my Q7

 
Old 07-10-2019, 08:20 AM
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Default Something strange happening with my Q7

Hey guys,

So recently grabbed a 2007 Audi Q7 4L, and I feel like something's wrong with it. It takes about 2 seconds to start up and then idle at about 900-1000 rpm with the check engine light on. After about 15 seconds of idling it drops to about 600 rpm and the light goes away. No codes pop up when I hook up the scanner and the Intake Manifold, Airbox and Intake piping are all clean.

Any Ideas?
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Old 07-10-2019, 09:17 AM
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What Engine? What Scanner? does CEL flash at all?
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Old 07-10-2019, 01:15 PM
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Are you using an VAGCOM scanner or a generic ODB2?
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Old 07-11-2019, 08:11 AM
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It's a generic OBD 2 Scanner, I was contemplating on buying a VAG-COM scanner.

Also, the engine size is the 3.6 EA390 VR6.
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Old 07-11-2019, 08:12 AM
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Originally Posted by dreadlocks View Post
What Engine? What Scanner? does CEL flash at all?
Nope CEL doesn't flash when it's on. Just stays on solid and then disappears.
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Old 07-11-2019, 08:14 AM
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You should get it scanned with a VCDS/OBDEleven before we determine there are 'no codes', but if I had to guess I would say it sounds like the SAI, or some other emissions component thats active on a coldstart.
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Old 07-11-2019, 08:19 AM
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Originally Posted by dreadlocks View Post
You should get it scanned with a VCDS/OBDEleven before we determine there are 'no codes', but if I had to guess I would say it sounds like the SAI, or some other emissions component thats active on a coldstart.
Alright good to know. Where would I find my SAI?
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Old 07-11-2019, 08:23 AM
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its Secondary Air Injection, its a little pump on the front of the motor that pumps air into head when its starting up to force it to lean out until the oxygen sensors and stuff have a chance to warm up and take over the fueling loop.. they are notorious for having issues on the VR6 and are testable via VCDS.. they can be rather hard to get too, at least in a little Golf.. with a Q7 its going to be inline and not traverse, so the front of the motor is facing drivers wheel.. could be much easier to reach.

With your dumb scanner, can you check readyness? SAI would have to pass self test to have passed all readyness checks.

Last edited by dreadlocks; 07-11-2019 at 08:27 AM.
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Old 07-11-2019, 08:35 AM
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Originally Posted by dreadlocks View Post
its Secondary Air Injection, its a little pump on the front of the motor that pumps air into head when its starting up to force it to lean out until the oxygen sensors and stuff have a chance to warm up and take over the fueling loop.. they are notorious for having issues on the VR6 and are testable via VCDS.. they can be rather hard to get too, at least in a little Golf.. with a Q7 its going to be inline and not traverse, so the front of the motor is facing drivers wheel.. could be much easier to reach.

With your dumb scanner, can you check readyness? SAI would have to pass self test to have passed all readyness checks.

My Scanner does support readyness and oxygen sensor testing but for some reason, nothing pops up on this dumber scanner. I was thinking about checking the Secondary Air Injector, and probably cleaning it, if that doesn't work I'll probably have to grab a VAG-COM cable, and the VCDS software from Ross-Tech.
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Old 07-11-2019, 08:43 AM
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