A compress test should help to determin which cyl it is.
Good luck and keep us posted.

 

A compress test should help to determin which cyl it is.
Good luck and keep us posted.

 

well, the code means that it's cyl. 2.

So I get a new ignition coil and was going to change it out today. Which I did. But on my way back from work yesterday, I'm driving down the highway and it throws me another code. And as it does, when I slow down, I notice the rpms are staying high. Get home and it's a P0121 code. Something wrong with the Throttle Position Sensor. Crap. Now, the car idles at 3400 rpm, doesn't want to shift until it hits 5000 rpm and sits just under 2000 rpm when stopped. I have to jam the brakes and even use parking brakes to keep it from taking off at a red light.

I ordered a new TPS and it'll be in early next week. Until then, I have no idea if the original misfire is fixed and my car acts like an over-excited german shepherd. When it rains, it pours.

 

Could take the TPS out and get a meter to read it. Maybe cleaning the sensor with contact cleaner and the intake butter fly valve in the intake might help?
Good luck and thanks for keeping us posted.

 

I also have a mis-fire in Cyl #3. I'm about to change the wires and spark plugs...give it a cleaning and see if that helps. PLease post if you needed to replace the coil and what worked for you.

 

I changed the plugs, wires and coil. No help. I now have that TPS problem. Changed that, and no difference.

I'm at the end of my rope, so it's going to the dealer on Thursday. I just hope I don't obliterate my brakes before then.

Now I'm thinking that my original coil and my original TPS are fine. It's probably the harness or the ECU itself. I hope not cuz that means we'll be having a lean Christmas this year...

Anyone interested in a used ignition coil or TPS?

 

Ok, so my situation is a prime example of why we have trained professionals.

I took the car in to the dealer this morning at 7.30 am, expecting to be without it for approx. two days. Less than an hour later, I get a call from Hyundai saying I had blown the intake manifold gasket. That's it. They charge me $250 parts and labour and I get my car back good as new 3 hours after I take it in.

Goes to show that sometimes DIY isn't the way to go.

Hats off to Hyundai Brossard for being so courteous and professional.

Now I can have a beer and relax.

 

Nacho, I'm sooo happy for you! I saw that u were in a lot of pain lately. U really deserve that beer, or better - take whole box of them! Just curious: did u notice an erratic sound at the tail pipe when idling? Did u feel the engine shaking when idling? I'm just asking because I know s/b with Lantra that has these two symptoms.



cheers!
mark

 

Thanks Mark!

Well, there wasn't any weird sound from the tail pipe, although I don't know if I would have noticed with the engine revving so high. But there was some shaking from the cylinder misfire.

 

Thanks for the update.
Could you add for the record
Could you add how many miles/kmeter are on this car?
What year?
Have you ever had any overheating problems or had to change the thermostat?

From what I have read and seen the intake gasket does not go to often.
Hope you get many more miles out of it.

 

I'm up to about 137,000 km (you do the imperial conversion) and I've never had any trouble with over heating. As far as I know the thermostat is original.

Probably just a random failure. Dealer didn't mention any reasons for the gasket to go.

 

I have a similar problem, was only happening when i first drove the car it would make this noise like a pressure relase or something.But this morning it did it all the way home from work about every 2 miles.any ideas?

 

Can you be a bit more descriptive? Is there any way to find out where the 'pressure release' sound is coming from?

 

Nacho, I've reproduced your problem! I was just doin regular checkin'n'stuff when I saw a rubber cap on the back of intake manifold. I think an intake for evaporated gases from gas tank. So, what I did was that I removed the thing while idling and the engine revved up like crazy! I've quickly put the cap back on. Just wanted you to know.


cheers!

 

Cool, good to know. Hope this thread helps someone out in the future.

 

QUOTE (NachoDog @ Nov 27 2008, 07:04 AM) index.php?act=findpost&pid=203756

Can you be a bit more descriptive? Is there any way to find out where the 'pressure release' sound is coming from?

I wish i could be, i cant make it happen while idleing looking under the hood.Im thinking it may be a ac clutch fan.

 

Can you replace the ac clutch or do you have to get a whole new unit nacho?I think im going to try and replace the belts first then see what happens.

 

My car does the blow-off sound periodically while AC is on - normal I guess. Anyway, tell us what you feel while u're driving, give us some feedback info.


cheers!

 

OMG

Yes my engine misfires! :banana:
Yes my car throws the P0121 code! :banana:
Yes my tail pipe sounds erratic! :clap:
Yes my car stays revving at 3400rpm! :liebe011:

I truly thank you IF this fixes my problem! :beer:

WISH ME LUCK EVERYONE! :w00t:

 

Problem solved!!!!!
Thank you very much, I checked the gasket today and yes it was blown!
Your thread saveed me a lot of grief!|

 

I've been racking my brain for two days on this car. This thread lead me to the problem. Blown intake gasket at #2 cyl.go nacho go. Thanks for your replies.

 

QUOTE (ken2400 @ Nov 15 2008, 11:18 AM) index.php?act=findpost&pid=201807

From what I have read and seen the intake gasket does not go to often.

Quite a common occurance... Get an Elantra with mis-fire at 2 or 3............ break out the can of CARB and spritz the intake along the manifold to cylinder head seam...

Of course there is common occurance of fried plugs, and wire ends that are arcing out to ground..