Question about Hyundai Tucson

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We have 94 Terracon 3.0L V6. The car continues to stall even at speed and all power systems go down - AC, Instruments, Radio. We also have engine warning lit - when checked in service manual light indicates exhaust manifold fault. Hyundai dealer has car for over 6 weeks and so fay have replaced - fuel pump, battery, alternator, seals in fuel pump, timing pulley seal to crank, spark plugs, fuel filter, transmitter, removed and cleaned fuel tank. They now have the manifold off as noise developed in top on engine while in their car and are replacing intake butterflies, sent manifold off to a specialist and so on... They advise computer shows no faults during this saga! All thoughts are appreciated.

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  • mike_nunweek Oct 08, 2010

    Thanks Greg, engine dyno was done only on 5th (current) visit. Don't know results as yet nor do I know of a PCM. Not aware of any checks to throttle position sensor but this sure sound like is worth a look. I will keep you posted. Regards Mike

  • mike_nunweek Oct 09, 2010

    Thanks for the help. I will try this for sure. Sorry you're correct - the year is 2004. Regards Mike

  • mike_nunweek Aug 18, 2011

    Thanks for your advise of 10mts ago. Still havent got to the bottom of this, the dealer has had the car since November 2010, just last week replaced CPS but previously done crankshaft & bearings at their own cost, oil pump, checked wiring loom and believe me the list goes on…..
    They remain unconvinced to test the main fusible link but I will speak to them again today and give them a further copy of your previous advise. By the way, the YOM is 2003 - sorry.

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If the engine warning light indicates exhaust manifold fault, then it seems to me that that's where they should be concentrating. There could be a crack in it causing the sensors not to regulate fuel delivery properly.

When all power systems go down, that would indicate a battery/ alternator problem or a wiring harness problem to me.

I would stick with the dealer though, since they have more experience than other garages in diagnosing and repairing problems on Hyundai cars.

Good luck with this repair.

Posted on Oct 09, 2010

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Hello! You have certainly been "through the mill"...I'll need a little clarification to get started...I believe the year of your Hyundai Terracan is incorrectly stated as 1994...That SUV was not manufactured until 2001...Please send a comment and I'll fix your vehicle...

Guru..................Saailer

Posted on Oct 08, 2010

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  • David Burbee
    David Burbee Oct 08, 2010

    Hello! After a bit of research it looks like the year (1994) is correct but the model (Terracon or Terracan) is in error...Irregardless, I have a solution for your Huyndai's 3.0L fault...The White wire that multiples battery from the 50A Main Fusible Link Box to the Fusible Link Box is going open...It is the +12 volt power feed to the; Electronic Control Module (ECM), A/C, and the Ignition Key...When the fault occurs it is much like shutting off the key...These are very difficult faults to point at the actual break, loose joint, Loose Fusible Link or corrosion which causes the lead to go open...I would suggest running an 8 Gauge wire across the mentioned points and see if the problem is repaired...If so make the connection permanent...

    The Main Fusible Link Box is located near the battery...The Fusible Link Box Is also under the hood...In this box are two links (Large Fuses); Link D...20A... (ECM) and Link F...30A (ignition)...If either one are loose or or corroded it will also cause the fault...If you have any questions don'1 hesitate to ask...

    Guru...............Saailer

  • David Burbee
    David Burbee Oct 09, 2010

    Hello! Let me know what you find...If you have a voltmeter it would be a great help...Alligator clip the meter in place and jiggle that White multiple and those fusible links...See if you can get it to fail...There is a remote chance that the ignition switch is failing...Just keep that thought tabled until we can clear the wires and links...This is a dangerous fault to road test...Saailer

  • David Burbee
    David Burbee Aug 19, 2011

    "They remain unconvinced to test the described link"? The customer is always right...Tell then to test the link and eliminate it as a fault. The fact it is a 2003 does not change anything. good luck and keep me informed...Guru Saailer

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T was a typo,please disregard.This will require much thought.It's late now but i will review this tomorrow afternoon.Did they do the engine?PCM analysis first?If they didn't,they should have after the first couple things didn't work.It may cost $90 but could save much more.I am looking at a diagram for another car,many engine operations have mainly the same components,1 thing not mentioned is the throttle position sensor.Took about a minute to see.That would affect the stall at least.If that fixes it,you move on to the next problem.Car repair is a systematic elimination of causes.The throttle position sensor is also an input to the PCM(powertrain control module)which directly affects the rest of the engine operation.Worth a shot at this point.Please keep me up to date if you hear something.When you comment here I will get an auto link to your post and reply ASAP.Good luck! Greg

Posted on Oct 08, 2010

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