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Discussion Starter #1
Hi all im a newbie hyundai owner and really need help..heres my situation: oh yeah the car is a 96 elantra 1.6gls(j2)

Purchased the car two days ago, test drove it and was impressed with everything including the nippy motor. But NOW, its causing me headaches.

Initially it would start up, but refuse to rev over 1000rpm. Now it just keeps on cranking. I checked for spark at the plugs ...nothing. I cant even smell any petrol so i dont think the injectors are pulsing.

Things changed: plugs, plug leads, something called a TDC sensor that plugs in near the head, and coilpacks checked. Still problem persists.

Ive read another users post whereby he had the same symptoms. His cure was a new crank sensor. Where exactly is the crank sensor? Is that the same thing as the TDC sensor?

Secondly would a faulty crank sensor cause the injectors not to pulse at all and also no spark? Would it make it possibly impossible to start the car?

All replies welcome. Im relying on you guys expertise instead of shelling out any more moola willy nilly:-(
 

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The crankshaft sensor is on the front of the engine, low down near the clutch end. It is held in by a single bolt. while the sensor is removed, just feel inside for the ring of 'triggers' that fire the sensor; some people have reported this breaking loose from the flywheel. The crank sensor would be a possible cause for your engine not running and would cause no spark and the injectors not to fire. Unfortunately without specialist equipment, you can't test the sensor so will just have to try another one. The electrical connector is a bit of a pain to get apart ! Good luck, Ed
 

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Thanks for the reply Ed:)

Update: Bit the bullet today and went and bought a brand new genuine Hyundai crank position sensor. Got home, fitted it on, started her up...and she starts now! ....but then i put my foot on the gas, and shes menopausal again...dohhh!

Whats going on with this car? Starts and purrs perfect at 1000rpm...but as soon as i tap that pedal....

It doesnt switch off, just wont rev up....any ideas? Tomorrow im gonna remove the crank sensor and check for those teeth you mentioned...im guessing they should feel like the teeth on a circular saw? Also gonna change the fuel filter...cant hurt to try


Im hoping it isnt another sensor somewhere. . if the timing belt has jumped a tooth or two...can that cause this no rev up prob?
 

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The ring of triggers should be a ring of metal pieces (spikes) that pass the crank sensor and should be firmly attached to the flywheel so you should not be able to move it with your finger through the sensor hole.

Glad it starts now; don't know why it won't rev. You could try disconnecting the battery negative; press brake peddle to drain any capacitors to reset the ecu, leave for 20 minutes, and then reconnect battery negative. This will make the ecu 'relearn' the sensors (it may have become set for your faulty crank sensor).

If you have a volmeter, you could backprobe the throttle position sensor (TPS) to make sure the voltage increses as the throttle moves. It is located near where the throttle cable ends but on the other side of the throttle flap to the cable. It has a three-pin connection.

Keep us posted, Ed
 

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update: today i removed the crank sensor and checked for those teeth you mentioned....i cant see or feel anything except for the normal teeth on the flywheel...if theyve broken off...woudnt they make some sorta noise twirling around the bellhousing?

How does this ring of triggers look exactly....the same continuous row of teeth as the flywheel...or just four teeth?...should i rotate the crank by hand and check?

The tps i;ll get an auto electrician to test out....i know squat about voltmeters lol.

Tomorrow gonna change the fuel filter and get the tps tested

Thanks again
 

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Discussion Starter #6
one more thing...the cambelt cover is off now..how can i check if the timing is spot on...all i see are two markings on the cam pulley...what should they line up to?
 

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I havn't personally seen whats underneath the crank sensor but here is the thread regarding the problem of broken triggers or tone wheel:

http://www.hyundai-forums.com/index.php?sh...28&hl=crank

I doubt very much that you have that problem but was just worth checking while replacing the sensor.

Have you tried resetting the ECU? It fixes a lot of problems. (Just disconect the battery or pull the fuse in the engine bay; same one that does the radio and alarm/immobiliser; then press the brake pedal)

There will be nothing wrong with the timing unless the timing belt is exceptionally loose. If it was running fine then the timing must be OK as regards the timing belt.

Ed
 

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Discussion Starter #8
SOLVED!!!


well its been a while...but finally got the problem fixed:) any guesses....















it turns out that the crank sensor that was supplied to me ( by Hyundai after the stringent VIN number/part number checks) wasnt the proper one as id noticed that it wouldnt go all the way into the block..there was probably a 3mm gap. Tried returning it, but they wouldnt hear of it. My original sensor would sit flush on the side of the block and was a quality metal type. This new one is a piece if crap plastic type.
But what was i to do....

I took the new sensor, filed of the "ridge" just below the rubber oring and shoved it back into the block..perfect. Started her up and she came to life...and revved! :banana: I could almost cry...

Thanks to all and especially EdGasket :thumbsup:
 
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