Question about 2005 Hyundai Tucson
VEHICLE IS HARD STARTING. AND ENGINE CHECK LIGHT IS ON. DIAGNOSTIC IS SAYING EGR SYSTEM INSUFFICIENT.
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Posted on Jan 02, 2017
SOURCE: check engine light
There are several things that could cause this, the quickest way to find the problem is using a code reader.
Under your dashboard, normally on the left side, there is a standardized connector made to plug a diagnostic reader into; it may have a plastic cover over it but the connector has a number of round pins recessed.
The code reader is plugged into this and the device reads the static memory that records error messages generated by the computer using inputs from numerous sensors on your car.
These are displayed on a small LCD and need to be noted so one can decode the numbers from a manual or installed software on a standard computer.
The code readers range in price from ~$30 to nearly $200 US and are available from any auto parts store or many stores on line.
If you have no urge to own one, any service shop will have them and charge you a couple of bucks to retrieve your codes and translate them.
Posted on Oct 07, 2008
Are you reset the stored codes there? The EGR (Exhaust Gas Recirculation) valve controls an engine's emission of smog-causing nitrous oxides, or NOx. Its job is to route a portion of the exhaust gases back into the intake manifold. That lowers combustion temperature to below 2,500 degrees Fahrenheit - the temperature at which NOx gases form.
EGR flow is controlled by the engine's computer, which opens or closes the valve as needed. The EGR system is, for the most part, in the "out of sight, out of mind" category, and typical doesn't require regular maintenance. But if it gets clogged with carbon deposits, you'll see your "check engine" light come on, and a code (perhaps P0401 or P0402 or P0403) will show that there is insufficient flow. That typically results from a vehicle being driven persistently on short trips that don't allow the engine to fully warm up. Flow problems also can be caused by carbon buildup due to failure to change the oil frequently enough.
A clogged EGR valve not only results in higher emissions, it can affect fuel economy and cause rough idling - even serious engine damage. Valves can usually be cleaned, but replacement is often recommended.
About thie generic fault code, I suggtes check this description and tips for solution information: DTC-P0401-Tests (keep in midn that this code applied for alot brands, Hyundai included).
Keep us updated.
Posted on Feb 09, 2011
Go to www.hmaservice.com and register( Vehicle by VIN). Afterward, you have access to shop manuals, service bulletins, wiring diagrams, etc. about your vehicle.
NOTE:.. EGR RESTRICTION POSSIBLE between exhaust manifold and EGR valve... check it out before replacing valve.... replacing the valve may not be the solution... having it properly diagnosed is!
Posted on Sep 23, 2009
There is an evap purge valve located in the back of the driver side of the engine. This valve needs to be replaced. Had the same code a couple weeks ago. Replaced that valve and the problem was fixed. Hope this helps.
Posted on Dec 29, 2010
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