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 B5 S4 - spluttering on overrun View next topic
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Robatron
Brand New, Welcome :)


Car: Audi S2
Power: 270bhp
Torque: 320 ft/lbs

Joined: 13 Oct 2008
Posts: 11


PostPosted: Mon Jul 17, 2017 12:00 pm  Reply with quoteBack to top

Hi all,

I have had a search on here but can't seem to find an awful lot.

The S4 has been recently acquired after sitting in a garage and not moving for 18 months. It felt dog slow so I took it to a friends workshop and he plugged it into Vagcom. This show an error message for one of the EGT sensors. I sourced some sensors through this forum and had them fitted and the codes wiped and it ran a lot better but is absolutely not what I would describe as quick. My wife's GTV V6 would mop the floor with it...

Next I replaced the MAF and the hose that leads to the Y pipe as the old one had a split in it. This has helped things a little but it still feels slow.

The thing I am currently trying to solve is why the car jolts/shudders on overrun. Has anybody had this issue? You can be approaching a roundabout or set of traffic lights so just lift off the throttle but it does not feel smooth and it definitely jolting/kangaroo-ing until I get back on the throttle.

Would faulty diverter valves cause this? Vacuum leaks? Dodgy N75 valve? I'm hoping whatever it turns out to be is also responsible for the lack of power.

Since it's come out of hibernation it's had 4/5 tanks of high octane fuel.

Any advice would be appreciated.
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stickertone
knowledgeable


Car: audi s4
Power: 340 ps
Torque: 526nm

Joined: 29 Dec 2009
Posts: 575

Location: hertfordshire

PostPosted: Mon Jul 17, 2017 5:38 pm Reply with quoteBack to top

Where abouts are you located mate? I suggest you run it to an audi specialist ( I use mrc) for a health check. Then it's sorted once and for all 👍👍👍👍

_________________
mrc stage 1 tune
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davey thomas
knowledgeable


Car: s4 2000 ko4 viper
Power: 460

Joined: 13 Apr 2013
Posts: 605

Location: newcastle upon tyne

PostPosted: Mon Jul 17, 2017 5:45 pm Reply with quoteBack to top

is that fuel 18 month + old edit ah just seen octane  
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Robatron
Brand New, Welcome :)


Car: Audi S2
Power: 270bhp
Torque: 320 ft/lbs

Joined: 13 Oct 2008
Posts: 11


PostPosted: Mon Jul 17, 2017 6:28 pm Reply with quoteBack to top

Cheers guys.

Yeah i think that ultimately it's probably cheaper to get it health checked at MRC than to keep replacing every sensor / component I can think of. I'm familiar with MRC as I've taken my old S2 to Doug in a number of occasions. I'm based in Greater London so a little bit of a trek.

Not sure if this helps diagnosis but I popped to the shops on the way home from work. When I turned off the car it was nice and warm (had just driven for 30 mins) and was feeling flat. Popped into Tesco for 5 minutes and hopped back in the car feeling a little fed up so gave it a couple of WOT runs and it felt much livelier.
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