I think I might have a vac leak p2179
09-25-2018, 08:46 AM
#2
AudiWorld Junior Member
I have had this error on my 2007 A8L for several years, and goes away most of the summer and often during the winter. This is a parametric failure giving a message of bank 2 lean off idle, that is when you are driving.
Doesn't seem to affect anything except for the CEL being on. I suspect the EGR valve not closing completely due to dirt or wear. I will eventually get a used one from ebay or somewhere and swap it out.
I also tried blowing smoke into the inlet system using a disco smoke machine but no external leaks showed themselves.
Doesn't seem to affect anything except for the CEL being on. I suspect the EGR valve not closing completely due to dirt or wear. I will eventually get a used one from ebay or somewhere and swap it out.
I also tried blowing smoke into the inlet system using a disco smoke machine but no external leaks showed themselves.
09-25-2018, 06:32 PM
#3
AudiWorld Wiseguy
Assuming by EGR valve you mean Exhaust Gas Recirculation valve. In which case the gas V8’s don’t have them. It has a Secondary Air Injection system which is different, and has specific trouble codes.
On a DI engine, lean off idle fault is often associated with coked up inlet valves, dirty injectors, or faulty high pressure fuel pumps.
On a DI engine, lean off idle fault is often associated with coked up inlet valves, dirty injectors, or faulty high pressure fuel pumps.
09-25-2018, 07:42 PM
#4
The EGR Valve is...
Assuming by EGR valve you mean Exhaust Gas Recirculation valve. In which case the gas V8’s don’t have them. It has a Secondary Air Injection system which is different, and has specific trouble codes.
On a DI engine, lean off idle fault is often associated with coked up inlet valves, dirty injectors, or faulty high pressure fuel pumps.
On a DI engine, lean off idle fault is often associated with coked up inlet valves, dirty injectors, or faulty high pressure fuel pumps.
https://smile.amazon.com/gp/product/...?ie=UTF8&psc=1
Secondary Air Injection has nothing to do with crankcase ventilation.
09-26-2018, 04:55 PM
#5
AudiWorld Wiseguy
...or in AUDI speak "bypass valve" is integrated into the oil separator. Aftermarket ones be cheap:
https://smile.amazon.com/gp/product/...?ie=UTF8&psc=1
Secondary Air Injection has nothing to do with crankcase ventilation.
https://smile.amazon.com/gp/product/...?ie=UTF8&psc=1
Secondary Air Injection has nothing to do with crankcase ventilation.
Also not sure how anyone who knows what they’re talking about would confuse the crank case breather with an EGR valve either. Again totally different system, and not “Audi speak” either.
01-13-2019, 09:16 AM
#6
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Short background: I systematically and routinely receive 2177, 2179, 2187, 1009 & 010B codes (lean off idle banks 1 & 2, and various MAF). I have replaced MAFs, spark plugs, coil packs, and did a smoke test last week that netted VERY little. A VERY faint amount of haze was seen (VERY faint) coming from an unknown place behind the engine against the firewall somewhere low.. we couldn't tell where it was coming from because it was so faint, but I have dismissed this from being enough to cause all the troubles I am having). This vehicle has a LIST of other issues (fault codes) too- But I will spare that detail.
Thank you in advance!
~George
Last edited by George Trudeau; 01-13-2019 at 09:19 AM.
01-13-2019, 09:57 AM
#7
AudiWorld Super User
Check to make sure the intake is properly affixed to the manifold and throttle body. I had a whole lot of codes and that's where my vacuum leak was causing all of them. It can be dislodged if working on other things in the area.
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01-13-2019, 10:01 AM
#8
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Thanks Dave!
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