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Engine shuts off

Tiny
BUDDY4408
  • MEMBER
  • 2003 HYUNDAI ELANTRA
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 110,595 MILES
My 03 elantra was bought new. It has developed a problem with the electrical system. The car shuts off due to loss of spark, then most of the time restarts. I first lost the cruise control then the tach stopped working and then the stalling started. I replaced the crank sensor even though it wes testing good. I suspect the computer but I have no way of testing it. There are no codes showing. This is all I have for you, what do you think?
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Tuesday, March 30th, 2010 AT 7:49 AM

11 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Hi buddy4408, Welcome to 2carpros and TY for the donation

Test the coils and also the engine control relay and comeback with some results
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Wednesday, March 31st, 2010 AT 4:23 PM
Tiny
BUDDY4408
  • MEMBER
  • 7 POSTS
The coils are good and I replaced the ecm. The tach and the cruise still dont come online. Cant find a listing for a ingnition module. That would be the first place I would go. Double checked all the fuses and found all good. The car runs perfect 95% of the time. I am stumped.
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Wednesday, March 31st, 2010 AT 6:01 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Do you have power on the white wires on the coils? The engine control relay is in the engine compartment relay and fuse box ( in left front corner of engine compartment behind battery.
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Thursday, April 1st, 2010 AT 2:09 PM
Tiny
BUDDY4408
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  • 7 POSTS
Ok, the coils go dead. Then in a few minutes or more it starts and runs fine. It may run for several hours or for ten minutes then shut off. Some times it cranks right up and other times it may take awhile. I cant get it to stay off long enough to track down the problem. Is the power control module in the fuse box? And if so what position. An why have the tach and cruise gone out at the same time? Are these all tied together?
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Sunday, April 4th, 2010 AT 1:03 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Sounds like you have a computer problem get it tested

Engine control module


https://www.2carpros.com/forum/automotive_pictures/12900_ecm_13.jpg



Engine control relay at no.17


https://www.2carpros.com/forum/automotive_pictures/12900_relay_28.jpg

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Sunday, April 4th, 2010 AT 4:36 PM
Tiny
BUDDY4408
  • MEMBER
  • 7 POSTS
As I said earlier I already replaced the computer and the crank sensor. I was wondering what you meant by the engine control module. I thought you were referring to another part as such. (Ecm, computer, brain, control module are general phrases for the engine control module) I am very well trained in automotive, retired 4 years ago after 30 years in the biz. But this one has me stumped and I was hoping for a fresh idea. I have swapped the main relay out thinking it was getting hot and opening up. Other than that I am out of ideas. Your turn!
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Sunday, April 4th, 2010 AT 8:01 PM
Tiny
BUDDY4408
  • MEMBER
  • 7 POSTS
Sorry I reread my messages to you, failed to tell you I replaced the computer.
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Sunday, April 4th, 2010 AT 8:04 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
No spark:

Check and test the coil's
primary and secondary windings if okay were right back to the computer-it tells the coil's to fire the plugs. You've replaced the CPS -I'm stomped too!
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Monday, April 5th, 2010 AT 5:29 AM
Tiny
BUDDY4408
  • MEMBER
  • 7 POSTS
Well Thanks for trying. I have went through all the steps and came up empty. I get no codes and the problem is intermittent Its hard to fix it when it aint broke! LOL
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Monday, April 5th, 2010 AT 10:50 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
This is my last place test the ignition switch could be breaking open when it gets hot and losing the ignition circuit on it
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Saturday, April 10th, 2010 AT 1:00 PM
Tiny
BUDDY4408
  • MEMBER
  • 7 POSTS
Dont mean to stress you. I will take your advice on the switch and if that dont fix it well you tried, and thank you.
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Saturday, April 10th, 2010 AT 6:27 PM

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