Question about Hyundai Elantra

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I recently purchased a 2003 Hyundai Elantra. As part of the purchase contract the dealership agreed to put in a new timing belt, as the one in the car had never been replaced when it was supposed to. Ever since they replaced it it idles really rough and "lopes" when stopped at a stop light. Only does this when in drive. Could this have anything to do with the timing belt not being installed correctly? The check engine light has not come on. I brought it back to the dealership and they supposedly rechecked everything and didn't find anything wrong but the problem is getting worse!

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Hi! Its gonna be a simple fix. The timing belt has nothing to do with it, but I suspect the MAF (mass air flow) sensor. The MAF has big contribution on engine performance specially on the idling. Have it replaced and it it will be resolved. Hope this helps and have a good one!

Posted on May 13, 2010

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TECHNICAL SERVICE BULLETIN

Group
90 - ELECTRICAL

Number
03-90-020

Date
October, 2003

Model
Elantra 2001-2004, Santa Fe 2001-2004, Sonata 2002-2004, Tiburon 2003-2004, XG(NNN) NNN-NNNNand XG(NNN) NNN-NNNN2004

Subject
SECURITY SYSTEM KEYLESS ADAPTER CABLE

This bulletin supersedes TSB # XXXXX
DESCRIPTION:
The security system keyless adapter cable (SPX/Kent-Moore P/N 09900-21300) is a special service tool (SST) that is used for programming new keyless entry remote transmitters to the factory security systems. The keyless adapter is used in conjunction with the Hi-Scan Pro (with Hi-Scan SOL Pro Software Version 09-29-03 or newer) and Data Link Connector (DLC) Cable.
SERVICE INFORMATION:
The keyless adapter cable can be used on the following vehicles:
^ 2001 -2004 Elantra
^ 2001-2004 SantaFe
^ 2002 - 2004 Sonata


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