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Model specific boards => Golf mk4 => Topic started by: Petehewitt on 08 April 2014, 22:08

Title: Judder at low revs
Post by: Petehewitt on 08 April 2014, 22:08

Any help much appreciated- 2001 1.8 turbo with aum engine has an intermittent fault where from cold the engine judders and surges when driving at low revs. I changed the mam but still does it. I've seem a variety of ideas but means spending a lot of ££ on coil packs, sensors etc and want to know what order I should do things in to try and track it down. It's an intermittent fault and once the engine has been driven a while seems much improved but can still be present. Also if I drive at a constant speed some times booting it puts the traction control light on and epc and have to turn the engine off and back on as I have no power what so ever- again this is intermittent . Plugged in vagcom but no fault codes- any ideas guys?

Title: Re: Judder at low revs
Post by: XMC1980 on 08 April 2014, 23:13

My previous AUM did that too and it was a 2001, I did the ultimate delete sai pump and N deletes, this did sort it out.

Title: Re: Judder at low revs
Post by: Petehewitt on 09 April 2014, 17:33

What is sai and n?

Title: Re: Judder at low revs
Post by: dom on 09 April 2014, 20:10

Quote from: Petehewitt on 09 April 2014, 17:33

What is sai and n?

Secondary Air Pump and N249/N112 valves