My Jetta had a fast idle problem too, but at around 1200 r/min. It would happen at rondom, but particularly at start, but got worse to include hot starts too. It would burst into life with a cloud of soot and idle at 1200. With the Oettinger computer, pulling off and going round traffic circles was particularly interesting.
Turned out to be a faulty water temperature switch. The guage did not read 90 degrees as normal, slightly below. If you started the car at anything below a reading of 90 degrees, it idled at 1200.
Interesting Anton, because my TDi according to VAGCom and my RD gauge my Polo water temperature normally sits at aroun 80 - 81 degree's But a fualty water temperature sensor could affect idle as the ECU "believes" the car is cold and adjusts to warm up...
Neuk wrote:Interesting Anton, because my TDi according to VAGCom and my RD gauge my Polo water temperature normally sits at aroun 80 - 81 degree's But a fualty water temperature sensor could affect idle as the ECU "believes" the car is cold and adjusts to warm up...
Correct my if I'm wrong, but would a TDi warm up by idling faster? I know they only get warm by driving after cold start. The only difference I notice with a cold start is that the diesel consumption (1l/h down to 0.7l/h when cold) is higher for a while until it gets warm (0.4 - 0.5l/h).
Current: '21 Audi 8V S3 Sedan S tronic Ex: '15 Mk7 Golf 2.0 TSI Performance Pack DSG® Ex: '13 Mk7 Golf 2.0 TDI Comfortline Ex: '10 6R Polo 1.6 TDI Comfortline Ex: '06 9N3 Polo 1.9 TDI Highline Ex: '98 6N Polo 1.8i Lux Ex: '96 Chico 1.3... it was green
Neuk wrote:Interesting Anton, because my TDi according to VAGCom and my RD gauge my Polo water temperature normally sits at aroun 80 - 81 degree's But a fualty water temperature sensor could affect idle as the ECU "believes" the car is cold and adjusts to warm up...
Correct my if I'm wrong, but would a TDi warm up by idling faster? I know they only get warm by driving after cold start. The only difference I notice with a cold start is that the diesel consumption (1l/h down to 0.7l/h when cold) is higher for a while until it gets warm (0.4 - 0.5l/h).
Possibly true - A TDi generally cannot warm itself up by just idling, but I am not sure at what point it will start generating excess heat that can be used to warm up Also remember that at colder temperatures teh EGR will be open more, feeding exhaust gas back into the engine to help with warmup...
Neuk wrote:Interesting Anton, because my TDi according to VAGCom and my RD gauge my Polo water temperature normally sits at aroun 80 - 81 degree's But a fualty water temperature sensor could affect idle as the ECU "believes" the car is cold and adjusts to warm up...
Correct my if I'm wrong, but would a TDi warm up by idling faster? I know they only get warm by driving after cold start. The only difference I notice with a cold start is that the diesel consumption (1l/h down to 0.7l/h when cold) is higher for a while until it gets warm (0.4 - 0.5l/h).
Possibly true - A TDi generally cannot warm itself up by just idling, but I am not sure at what point it will start generating excess heat that can be used to warm up Also remember that at colder temperatures teh EGR will be open more, feeding exhaust gas back into the engine to help with warmup...
True. Would be interesting then to hear from veedubbed what the consumption (l/h) indicates when the high idle issue manifests itself.
Current: '21 Audi 8V S3 Sedan S tronic Ex: '15 Mk7 Golf 2.0 TSI Performance Pack DSG® Ex: '13 Mk7 Golf 2.0 TDI Comfortline Ex: '10 6R Polo 1.6 TDI Comfortline Ex: '06 9N3 Polo 1.9 TDI Highline Ex: '98 6N Polo 1.8i Lux Ex: '96 Chico 1.3... it was green
hey guys.... at 800 revs which is where the idle sits now after it was changed to by the dealer I took it to : 0.6/0.7l
when the idle decides to sit at 1000 its exactly the same 0.6/0.7l
With the aircon on its at 0.9/1.0l at 1000 revs...
Current El Toro 2009 Seat Ibiza Cupra 1.8T(El Toro)
veedubbed wrote:hey guys.... at 800 revs which is where the idle sits now after it was changed to by the dealer I took it to : 0.6/0.7l
when the idle decides to sit at 1000 its exactly the same 0.6/0.7l
With the aircon on its at 0.9/1.0l at 1000 revs...
So took the car in to Frans this morning at Hatfield. Got a call now saying he has checked the car and the problem is electrical. Seems to be the wiring from the control unit to the alternator. They changed the control unit and car still did the same - So it must be the wiring causing the alternator to think the battery is low on charge- They have to rebook the car in with the auto elec at the dealer as he is fully booked for a while. They said its ok to drive the car like this until it goes back in. Shew! Im okay now that the car is in hands of peeps who know!
Current El Toro 2009 Seat Ibiza Cupra 1.8T(El Toro)
veedubbed wrote:So took the car in to Frans this morning at Hatfield. Got a call now saying he has checked the car and the problem is electrical. Seems to be the wiring from the control unit to the alternator. They changed the control unit and car still did the same - So it must be the wiring causing the alternator to think the battery is low on charge- They have to rebook the car in with the auto elec at the dealer as he is fully booked for a while. They said its ok to drive the car like this until it goes back in. Shew! Im okay now that the car is in hands of peeps who know!
The on booard electronics only see's 12.3v while all other ecu's see 13.7v.
So on board will jack up idle atuo to try chrge battery and supply current to other ecu's.
Why the other place did not see that.We took a look and saw the falt in onboard and then check rmvb.
G60 16V GOLF
WHAT WE LEAVE BEHIND IS NOT AS IMPORTANT AS HOW WE LIVED.
IT IS NOT UNSAFE IT IS OLD SCHOOL!!!!!!!!!
ALDO IS THE MAN WITH A GUN.
THATS HOW WE ROLL [SAINT-J]
GTS KNOWS HOW TO MAKE A STICKER.
Hey guys. Got my car back today! Missed it for a few days All is back to normal. Big thanks to Morne and Frans at Hatfield VW for the great service. From what I understand(I need a course in engine jargon) it was the earth straps on the harness that were acting up so that's what caused the car to read less voltage back from the alternator. All is sorted and the car is happy!
Current El Toro 2009 Seat Ibiza Cupra 1.8T(El Toro)
The onboard electronics has 6 power supplys and a number of earths.
The power supplys was there but not the one earth so the ecu only read 12.3v.
The ecu then would tell the engine ecu to pick up idel on the car so the alt can charge more.
The new systems drive me up the wall sumtimes.
G60 16V GOLF
WHAT WE LEAVE BEHIND IS NOT AS IMPORTANT AS HOW WE LIVED.
IT IS NOT UNSAFE IT IS OLD SCHOOL!!!!!!!!!
ALDO IS THE MAN WITH A GUN.
THATS HOW WE ROLL [SAINT-J]
GTS KNOWS HOW TO MAKE A STICKER.
veedubbed wrote:Hey guys. Got my car back today! Missed it for a few days All is back to normal. Big thanks to Morne and Frans at Hatfield VW for the great service. From what I understand(I need a course in engine jargon) it was the earth straps on the harness that were acting up so that's what caused the car to read less voltage back from the alternator. All is sorted and the car is happy!
BAM - That just happened Morne and the team at Hatfield VW Bryanston are legends
Guys, I have a similar problem with my Polo Classic 1.9 tdi. When I start the car in the mornings the rpms sit at 890-900 for few seconds then go up to 1000. I have been to 2 different places for diagnostics where the 1st one couldn't find anything and the second one said calibration needed to be done, did the calibration and the rpms are now at 980 but it is still doing the same thing of starting slow and then rev up after few seconds. Please assist me guys I'm still new to the family and this is now frustrating. I'm in Pretoria.