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2008 Hyundai Verna CRDI : Poor pickup


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vsgiri
New User

Mar 24, 2014, 7:15 AM

Post #1 of 3 (3573 views)
2008 Hyundai Verna CRDI : Poor pickup Sign In

Hi everyone,
I own a Hyundai Verna CRDI (1.5L), and I have been observing low pickup issues for a while. The car has run around 60000kms. I'm trying to narrow down the problem myself - so I bought an OBD 2 scanner and coupled it to my tablet with Torque Pro.

One thing that caught my attention is the EGR. When engine is idle, the EGR commanded is 5.4% (should have been 0 - but 5% is probably good enough). However, my EGR error rate is 99.7%. This didn't seem normal. Now when I rev up the engine to around 2000rpm, I see that the EGR % is going to around 50-60% while the EGR error suddenly drops to -99%.

The observation tells me that the EGR is in open loop control, however either the EGR valve position sensor is faulty or the valve itself could be stuck open?

Can someone guide me on how I can go about diagnosing the problem further?

I'm a bit of an enthusiast, but I haven't got my hands dirty yet - are there any other experiments I can run using Torque to diagnose this further?

The scanner shows that no error codes were registered. Also I don't see black smoke - not through my rear view mirror at least. Efficiency has gone down as well - but I'm really concerned about the pickup.

The problem has been around for a year and started off quite abruptly when I felt I lost some power while driving on the highway. Ever since, the problem has persisted. Sometimes, all of a sudden the car comes alive and has excellent pickup. After an overnight rest, it returns to normal. The problem is quite confounding. Any ideas appreciated.

Thanks,
vsgiri


Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

Mar 24, 2014, 9:05 AM

Post #2 of 3 (3553 views)
Re: 2008 Hyundai Verna CRDI : Poor pickup Sign In

This forum mainly deals with stateside vehicles, so advice may be limited.

EGR won't cause loss of power on acceleration. The EGR valve should never be open at idle or while reving the engine in park or neutral. The command and error values your seeing on your scan tool may not be right due to software bugs in your tool. If the error was that much when the PCM was actually commanding the valve it would certainly set an EGR code.





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vsgiri
New User

Mar 24, 2014, 9:24 AM

Post #3 of 3 (3548 views)
Re: 2008 Hyundai Verna CRDI : Poor pickup Sign In

Thanks for your response. Would you mind sharing some ideas on how I could approach solving the poor pickup problem? Could it be related to the MAF sensor/fuel flow/pressure? Any parameter from the scan tool that might help diagnose this problem? What would be very helpful is some approximate range of values of parameters under idle/load/cruise conditions so at least I can know if something is really off. Right now I'm hunting in the dark. From what you mention, it appears I should set aside EGR for the moment?

Thanks in advance once again for your help.

vsgiri






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