"lumpy" throttle response

4.2 V8 40v biturbo - 450 bhp
4.2 V8 40v biturbo - 480 bhp (plus)
swannny
5th Gear
Posts: 1057
Joined: Thu Dec 29, 2011 7:15 pm
Location: cambridge

Re: "lumpy" throttle response

Post by swannny » Thu Mar 01, 2012 10:27 pm

i've got a lot to learn!

i've had vag-com for many many years, only really used it for fault codes, changing options, and even lowered my allroad, but all those figures really don't mean much at the mo!
I used to own a 6, now I'm just a lurker!

marv8
3rd Gear
Posts: 497
Joined: Sun Aug 01, 2010 5:55 pm

Re: "lumpy" throttle response

Post by marv8 » Thu Mar 01, 2012 10:41 pm

Will look at gettin the DV and N75 changed - is the N75 a big job? From what I have read on here N75 replacement is pretty much "maintenance"!
So add some waggers and I should be almost there (already done vacuum hoses), think silicone ic hoses come with/get fitted with the wagners.
Do you think an air leak somewhere could cause the stuttery mid range?

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Shoppinit
Cruising
Posts: 20282
Joined: Wed Dec 31, 2008 6:24 pm

Re: "lumpy" throttle response

Post by Shoppinit » Fri Mar 02, 2012 9:16 am

I normally like vacuum leaks for these kind of problems, but it doesn't look like unmetered air is getting in - quite the opposite in fact. IF unmetered air was being sucked in, I would have expected the ECU to be enriching the mixture to compensate and you've got the opposite.

DVs are extremely easy. N75 is too, just need to get the airbox off to access it. Cheap and easy jobs. Worth it for peace of mind.
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."

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