Polo tdi high idle issue... going to Hatfield Thursday :)

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Re: Polo tdi high idle issue... going to Hatfield Thursday :)

Post by Neuk »

OettingerTDi wrote:Just a thought...

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. :grin:

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 :wink: But a fualty water temperature sensor could affect idle as the ECU "believes" the car is cold and adjusts to warm up...

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Re: Polo tdi high idle issue... going to Hatfield Thursday :)

Post by kripstoe »

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 :wink: 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).
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Re: Polo tdi high idle issue... going to Hatfield Thursday :)

Post by Neuk »

kripstoe wrote:
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 :wink: 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 :wink: Also remember that at colder temperatures teh EGR will be open more, feeding exhaust gas back into the engine to help with warmup...
Current Garage:
Daily Drive: 2014 VW Touareg 3.0 V6 TDi R-Line
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Previous Garage:
Roxy: 2015 VW Golf R
Vagon: 2005 Audi B6 A4 1.8T (140kw) Avant
Project XXXX: 1967 VW Type 3 Variant (Squareback)
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Re: Polo tdi high idle issue... going to Hatfield Thursday :)

Post by kripstoe »

Neuk wrote:
kripstoe wrote:
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 :wink: 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 :wink: 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.
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Re: Polo tdi high idle issue... going to Hatfield Thursday :)

Post by SoDub »

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...
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Re: Polo tdi high idle issue... going to Hatfield Thursday :)

Post by Neuk »

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...
Mine is pretty much identical...
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Re: Polo tdi high idle issue... going to Hatfield Thursday :)

Post by SoDub »

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!
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Re: Polo tdi high idle issue... going to Hatfield Thursday :)

Post by Neuk »

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!
Good to hear...
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Re: Polo tdi high idle issue... going to Hatfield Thursday :)

Post by MK2 G60 »

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.
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Re: Polo tdi high idle issue... going to Hatfield Thursday :)

Post by SoDub »

heheh G60 Golf - The other dealer had the car for 6 days. You guys had it for less than 2 hours and you found the problem easily!!!

After the other dealer insisted my car had a throttle body and they were going to change it I should have run to get my car out of there hehehe
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Re: Polo tdi high idle issue... going to Hatfield Thursday :)

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g60 golf wrote:Why the other place did not see that.We took a look and saw the falt in onboard and then check rmvb.
*sigh* No wonder so many people complain about VW service.
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Re: Polo tdi high idle issue... going to Hatfield Thursday :)

Post by ree1 »

Thanks 4 the update, now i can sort out my car
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Re: Polo tdi high idle issue... going to Hatfield Thursday :)

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ree1 wrote:Thanks 4 the update, now i can sort out my car
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Re: Polo tdi high idle issue... going to Hatfield Thursday :)

Post by SoDub »

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!
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Re: Polo tdi high idle issue... going to Hatfield Thursday :)

Post by MK2 G60 »

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.
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Re: Polo tdi high idle issue... going to Hatfield Thursday :)

Post by Neuk »

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 :crazy: Morne and the team at Hatfield VW Bryanston are legends :wink:
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Re: Polo tdi high idle issue... going to Hatfield Thursday :)

Post by ree1 »

Good news, howmuch will it cost
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Re: Polo tdi high idle issue... going to Hatfield Thursday :)

Post by sanelenanti »

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.
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Re: Polo tdi high idle issue... going to Hatfield Thursday :)

Post by SoDub »

Hi sanelenanti! Please see what G60 Golf diagnosed mine as. It seems to be an earth issue that causes the higher idle.
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