1997 Hyundai Excel Engine drop out

Tiny
BISCUIT106
  • MEMBER
  • 1997 HYUNDAI EXCEL
  • 4 CYL
  • FWD
  • MANUAL
  • 113,000 MILES
For a few months, yes I know that I should have dealt with the problem sooner, my car hesitates for about half a second, and then is fine. This can happen often during a trip, or not at all, and has recently been getting worse. The car has recently been serviced, new filters, ignition leads, fluids all done, a general safety check, and the timing belt, some driving belts and the crank shaft pulley done. There appears to be no mechanical problem at all, so I am assuming it is an electrical engine management problem. My mechanic is a bit stumped, as everything checks out on the testing equipment as OK, but the problem is still their and seems to be worse, probably because the engine is working better. Can you suggest where to look or what to start testing so that my car can be fixed?
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Tuesday, December 23rd, 2008 AT 12:01 AM

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Tiny
BLUELIGHTNIN6
  • EXPERT
Hello
Thanks for the donation

Sometimes if there are leaks in the intake plumbing(loose clamps, broken rubber or plastic intake parts), unmetered air enters the engine that the computer doesn't know about. Also suggest checking vacuum lines for any leaks as this too could cause hesitation.

Aftermarket oil saturated air cleaners can also damage heated wire Mass Air Flow sensors and trick wide band Oxygen sensors. If you have recently installed one of these, it could very well be part of your problem, but simply removing it will not fix the problem it caused. Often the MAF needs to be replaced.

Hope this helps.
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Tuesday, December 23rd, 2008 AT 1:56 AM
Tiny
SNB53
  • MEMBER
Had a similar experience with my wife's 98 excel. Sent into Hyundai dealership after we go sick of it, they said after putting it on the diagnostics machine that it was the oxygen sensor but after replacing that it made no difference. After testing again it showed up as the Cam Angle Sensor that was causing the problem but not showing up under any diagnostic analysis. They thought that they were being generous by taking the new oxygen sensor out and not charging for it but still charging some $290 for the other work and sensor.
Hope this helps

I would check for a vacuum leak. Have the injectors been cleaned?
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Saturday, December 27th, 2008 AT 5:33 PM

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