Missfire after spark plug change

4.2 V8 40v biturbo - 450 bhp
4.2 V8 40v biturbo - 480 bhp (plus)
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Siph3r
1st Gear
Posts: 76
Joined: Thu May 20, 2010 9:04 pm

Missfire after spark plug change

Post by Siph3r » Thu Apr 11, 2019 7:49 pm

Good evening.

Had oil/filter change along with sparkplugs today (OEM)

Fired her up and she sounded the way she should. After a min or so she started to hesitate anc chasing rpms.

Below faultcodes.

Is it possible that the MAF's was not seated properly on reinstall and it's sucking in some air?
Just wanting to have some ideas before i start to remove everything again.

Really need to get this sorted tonight as we are bound for easter hollidays tomorrow :oops:

5 Faults Found:

16885 - Vehicle Speed Sensor
P0501 - 004 - Implausible Signal - MIL ON

17535 - Fuel Trim; Bank 1 (Mult)
P1127 - 002 - System too Rich - Intermittent
17537 - Fuel Trim; Bank 2 (Mult)
P1129 - 002 - System too Rich - Intermittent
17546 - Fuel Trim: Bank 2 (Add)
P1138 - 001 - System too Lean
17416 - Mass Air Flow Sensor 1/2
P1008 - 008 - Implausible Signal - Intermittent

Thanks :)
2003 RS6
2000 S8
1993 URS4

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Jayjay101
4th Gear
Posts: 879
Joined: Fri Dec 18, 2015 9:24 pm

Re: Missfire after spark plug change

Post by Jayjay101 » Thu Apr 11, 2019 8:02 pm

Sounds like maf seals to me


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c5 rs6 owner thats been known to cut the wrong wire.............

Ajc
4th Gear
Posts: 765
Joined: Sun Mar 27, 2016 7:27 pm
Location: Cheshire

Re: Missfire after spark plug change

Post by Ajc » Thu Apr 11, 2019 8:28 pm

Reseat the air box
Cheers Al

04 c5 rs6 , Ebony Black, Bare shell repaint , Milltek's, PSS9's,Hotchkis Arb's,Gutted precats, hybrid turbos, Bosch 044 ,And an annoying EML light

Ajc
4th Gear
Posts: 765
Joined: Sun Mar 27, 2016 7:27 pm
Location: Cheshire

Re: Missfire after spark plug change

Post by Ajc » Thu Apr 11, 2019 8:30 pm

Jayjay101 wrote:
Thu Apr 11, 2019 8:02 pm
Sounds like maf seals to me


Sent from my iPhone using Tapatalk
:jump: just noticed your sig
Cheers Al

04 c5 rs6 , Ebony Black, Bare shell repaint , Milltek's, PSS9's,Hotchkis Arb's,Gutted precats, hybrid turbos, Bosch 044 ,And an annoying EML light

Siph3r
1st Gear
Posts: 76
Joined: Thu May 20, 2010 9:04 pm

Re: Missfire after spark plug change

Post by Siph3r » Thu Apr 11, 2019 8:48 pm

Yes!

Airbox was to high, so removed and tried again and it dropped apx 3 cm further down.

Working like a charm :)

Thanks guys
2003 RS6
2000 S8
1993 URS4

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