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    Thread: PUC/Emission test problem

    1. #1

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      PUC/Emission test problem

      My Vento Highline TDI turned 1 year this November. Insurance renewal and servicing done and it's now time to do emission test.

      I visited a PUC test centre last week in Bangalore. for doing PUC, earlier they used to dip a steel rod into the engine oil to measure Engine oil temperature. Looks like now the method is changed. He opened the bonnet & connected two plug points one at the battery and one another at the engine. He then sat inside the car with a meter to measure the oil temperature. The PUC readings have to be taken for min RPM and max RPM. He started accelerating my vehicle for min and max RPM. My heartbeat started pumping. OMG what the heck is he doing to my engine? Can't do much as I need the PUC certificate

      After doing tests for about 15 minutes i.e. t
      est Cycle 1 to Test Cycle 10 and each with Min RPM & Max RPM, he completed all of these and while printing the results, the system throws some error and it doesn't go through. He tried to repeat the test twice but nothing happened.

      Then he told me that the Min RPM should be atleast 1000, but for all VW cars the min RPM is around 750 only. So he is not able to do the emission test. I was surprised to hear this. I asked him again do you mean ALL VW cars and he said "Yes sir, ALL VW cars".

      Frustrated to the core I reached office. Then I decided to visit another PUC centre in the evening and even he struggled and about 15 mins he was able to capture the readings and PUC was done for my Vento. So no worries for the next 6 months atleast

      The meter he had clearly showed the error message that "Min RPM < 1000, test failed". These days most of the diesel cars can accelerate well under 1000RPM and so for most cars the min RPM is less than 1000. Even for Punto it's around 800-850 only. Also they have to take the PUC reading for max RPM 5000 which is ideally not possible when the vehicle is not running and it is idle.

      I am not sure how come the PUC norms/rules have that the min as 1000 and max as 5000.

      Has anyone else faced similar situation?
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      Quote Originally Posted by mari.parthi View Post
      Has anyone else faced similar situation?
      Almost all cars will have Idle RPM as 750. Even my truck idle rpm is around the same range.

      Till date for me within 5-6 readings everything is set. May be he was doing it for the first time. Here the catching of the rpm when he is pressing the accelerator pedal is important. If not then you will get more than 10-12 readings on the PC certificate.
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      How diff is the Pertol and Diesel PUC procedure?

      Have been getting my Petrol Vento's PUC done for over a year now. Now issues faced.
      Just the first time, the attendant somehow couldn't connect to the battery terminal. Drove to a diff one and he knew his job. No issues hence.

      As far as I know, all cars have idle rpm below 1000 (?). That is why they tell us to rev a little.
      VW also has an idle rev limiter at 3.5k I think.

      Do you have prior experience with this PUC guy? If not, visit someone in a diff vicinity.
      Last edited by Ironhide; 10th Dec 2012 at 15:04. Reason: duplicate post removed
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      Quote Originally Posted by shishirbn View Post
      Till date for me within 5-6 readings everything is set. May be he was doing it for the first time. t
      Quote Originally Posted by NFSpoet View Post
      Do you have prior experience with this PUC guy? If not, visit someone in a diff vicinity.
      For my old car (Tata Indica Xeta Petrol) I have always taken the PUC from this guy only. For my Vento this is the first PUC so visited him again. Not only for VW, even for Etios Diesel, one of my friend faced the same issue. My Vento's idle rev did not cross beyond 3450.

      The PUC guy in two centers I visited told me the same thing. I thought of talking to VW Service Centre but since I was able to get the PUC done from the 2nd centre I did not talk to service centre. This new procedure is introduced recently only it seems.

      Quote Originally Posted by NFSpoet View Post
      How diff is the Pertol and Diesel PUC procedure?
      For petrol they used to insert a needle in the rear exhaust of the vehicle but for diesel they don't and they have a new meter to take PUC (oil temp, min max rpm etc.)
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      Quote Originally Posted by mari.parthi View Post
      My Vento's idle rev did not cross beyond 3450
      This is news to me. I have never seen the PUC guy taking it beyond 2000rpm IIRC on any cars whenever I have gone there.

      May be you change the test centre
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      Quote Originally Posted by mari.parthi View Post
      The PUC readings have to be taken for min RPM and max RPM.
      This is news to me.

      I've done emission test back in Chennai (in Oct) for my Vtec.
      Test was done at idling rpm only and it not 1000rpm around 900

      and and I've done testing for my dad's Swift VDi then too test was done at idle no revving the nuts off business.
      Last edited by yzfrj; 10th Dec 2012 at 15:03.
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      Quote Originally Posted by NFSpoet View Post
      VW also has an idle rev limiter at 3.5k I think.
      Quote Originally Posted by mari.parthi View Post
      My Vento's idle rev did not cross beyond 3450.
      It won't cross 3500 RPM. VW and a few other manufacturers have a fail safe mechanism that prevents a car from being revved to redline in idle to prevent damage to the engine.

      Not sure what this new procedure for PUC testing for diesels is. However, I need to get a test done for my car soon. Will post more details when I do.
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      Quote Originally Posted by mclaren1885 View Post
      Not sure what this new procedure for PUC testing for diesels is
      I just did PUC last week for my Safari and what he did is kept some kind of a rod near the exhaust and asked me to accelerate and after few seconds he asked me to turn of the engine. Below is the certificate

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      Quote Originally Posted by mari.parthi View Post
      He opened the bonnet & connected two plug points one at the battery and one another at the engine
      I too had the same issue with Ford Classic. One of the places, they tried multiple times by revving in various RPMs, but could not get the data. He asked me to wait, but I was in a hurry and left the place.

      I tried a second station, the lady out there used the same method, but managed to get the reading. Also, I was told that the system is online with RTO network and the data are uploaded.

      For diesels, I think the old method if inserting a rod inside exhaust pipe and reading is no longer valid at least in Bangalore.

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      Quote Originally Posted by turbokick View Post
      For diesels, I think the old method if inserting a rod inside exhaust pipe and reading is no longer valid at least in Bangalore.
      Yes correct, what I am not sure is that how come the new PUC testing is introduced without taking a note on how modern diesel cars are operated.
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