ABF Spluttering/ misfiring

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Burn
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ABF Spluttering/ misfiring

Post by Burn » Sun Apr 08, 2018 7:09 am

Hi All

Need some help urgently on my mk1 ABF, Once vehicle reaches optimum temperature it starts to splutter or like reach a dead spot and then misfired back fires and is back to normal. 1st and 2nd can pull through rev range with no issue, problem comes in from 3rd after 3000rpm

I have changed fuel pump. Velo pump
Dizzy cap and rotor
All leads and Bosch coil
Fitted a new module ( Tp100 if I am not mistaken) last week and the problem has reduced substantially but is till present.
I also changer power and earth for the managment and redone vehicle earth.
Changed relay for fuel pump.
Car was tuned 2 weeks back at RBTS. Ross said it wasn't the map.

Any and all help will be highly appreciated
Last edited by Burn on Sun Apr 08, 2018 5:35 pm, edited 1 time in total.
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Re: ABF Spluttering/ misfiring

Post by panic-mechanic » Sun Apr 08, 2018 3:09 pm

sounds like a tuning issue. Remeber things like water temp compensation and dwell time could cause what you are finding.
Also have you changed the plugs. You don't say.
Also try changing the plug gap - make it smaller.
Stephan van Tonder - Jhb - Putfontein Benoni
'07 Audi S6 V10 - beast !!!!!
'05 Audi A6 3.0L TDI Avant
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Burn
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Location: Midrand JHB

Re: ABF Spluttering/ misfiring

Post by Burn » Sun Apr 08, 2018 5:36 pm

Hi Stephan yes plugs were changed. Will try change gap, if that doesn't work I'll call u and see when we can arrange for a tune
12 Polo Tsi
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Ex:
04 Caddy
79 2 door
98 Caddy
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PapaJo
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Re: ABF Spluttering/ misfiring

Post by PapaJo » Sun Apr 08, 2018 7:30 pm

How is the fuel pressure?
Burn
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Re: ABF Spluttering/ misfiring

Post by Burn » Sun Apr 08, 2018 9:23 pm

No I did not test fuel pressure. Assumed it would be 100% since I put a new pump.
Should I add a Fuel pressure regulator ?
12 Polo Tsi
84 MK1 GT

Ex:
04 Caddy
79 2 door
98 Caddy
04 Dot Com
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Re: ABF Spluttering/ misfiring

Post by panic-mechanic » Tue Apr 10, 2018 10:13 am

There is already a fuel pressure regulator. He is suggesting that you just check it. Not saying you should add one. There could be other reasons why the pressure drops.
Stephan van Tonder - Jhb - Putfontein Benoni
'07 Audi S6 V10 - beast !!!!!
'05 Audi A6 3.0L TDI Avant
'09 Audi Q5 3l tdi
'95 Audi 90 coupe quattro
'13 VW CC 2l tdi (repair project)
'05 Touareg v10

Perfect Power dealer. I do dyno tuning.
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