Hello all,

My tiburon has been to the dealer twice and they can't find anything wrong with it. (of course). The car starts fine but once I start going, each time I come to a stop, it will rev between 2500 down to about 1500, up and down and up and down a few times and will then settle down to 800-1000. Sometimes it will just keep going down and stalls. It always starts back up again right away. Sometimes I'll just press the clutch and the RPMs just plummet and the car stalls.

The other day I was going down a major hill and clutched to come to a stop, the car stalled right away and then I could not press the brake pedal down at all. Good thing the e-brake worked.

The dealer said it could be the oxygen sensor and that they can change it but if it doesn't work I can't return the part.

I don't see any difference whether it's been driven for 5 minutes or hours.

Any ideas???

This post has been edited by chrismont: Jun 22 2007, 12:54 PM

I wish that I could help you...I have a 2000 tib that is doing the same thing so I get to spend all day tracing the problem. When I find it I will let you know what the problem is.

ARGH! spent NINE hours at the dealer. Went for an hour drive with a mechanic and a computer hooked up to the car. They found nothing. No error codes showed up.

I think they are just guessing. They ended up changing the crank position sensor (?), told me to come back if it didn't work. I was back within minutes. Then they said maybe it's the Throttle Position Sensor. Haven't been back yet for them to try that.

What a pain. The car stalled the other day when coming to a stop and this guy started laughing at me.

"No, NO! It's the car! I really CAN drive!"

Dear chris,

ARRGH, I hate the dealer too.

It is not your oxygen sensor!

See attachments to correctly diagnose.

Byron

Attached File(s)
 2001_Tiburon_2.0_Emissions_Control_Troubleshooting_SERVICE_MANUAL.doc ( 32k ) Number of downloads: 118
 2001_Tiburon_Ignition_System_Troubleshooting_SERVICE_MANUAL.doc ( 137k ) Number of downloads: 130

Thanks Byron, but I can't find anything in there that directly relates to my problem. So for now the car is just sitting in the driveway gathering dust.

Dear chris,

Hate for you to park your Tib.

Since you have an older Tiburon, I really think you have a vacuum leak. the symptoms sound like a vacuum leak. And vacuum leaks can be intermittent faults it you have a hose with a crack, the crack widens when you hit a bump or turn the car a certain way, air leaks in.

Please check every vacuum hose from the MAF sensor back on your Tib. Move each hose up and down, back and forth, looking for any cuts or tears. You are looking for a hose that appears good, but reveals a split or crack when moved.

Seriously, I had a vacuum leak on my Tib that is newer and a different engine. than yours. I was changing the spark plugs, removed the intake plenum for access to the rear bank, forgot to connect this one small vaccum hose, and the car would not hold idle or stay running unless I pumped the accelerator. Found the hose, connected it, everything fixed.

Byron

This post has been edited by byronguidry3732: Jul 17 2007, 05:14 PM

Thanks Byron!

I'm going to check the hoses this weekend and we'll see what happens.......

Checked the vacuum hoses, they are all fine. Changed the throttle position sensor, still the same thing. Brought it to another place where they tested the computer looking for error codes and it still showed up no codes.

I want to sell the car but won't be able to with this problem! Any other ideas? anyone?

having same problem with my 1997 tib, 1.8. but mine is automatic, it doesn't stall but when going up hill it looses tremendous power, and I'm going up the hill at 5mph!! with the throttle mashed. the car won't go above 2,000rpm w/o engaging overdrive, and when I did I blew a spark plug, I was meesing with the vacuum hoses too cause it wans't idleing right and when we bent it a certain way it seemed to smooth the idle, and as soon as you let go of it, it goes bad again checked the vacuum hoses, they are all fine, what the heck is it?

Just curious but has anyone checked the fuel lines and pressure? I got a 00 Tib but not having these problems, yet, and I would like to know before hand. Thanks.

have any of you replaced or had replaced the throttle positioning sensor / switch? been on other forums and this seems to be the "norm"
when the engine is over revving / stalling as you have descibed.

hope this helps

phill

Throttle Position Sensor has been changed. Made no difference at all.

Any other ideas?????

Probably an intake air leak. Check for air leaks and with the car idling spray brake cleaner around all intake manifold gaskets and throttle body gasket if the idle suddenly goes up you have found your problem. Or it could be your idle air control valve

This post has been edited by Erikgsi: Mar 8 2008, 01:58 AM

hey man,
got a 01 and im having the same problem...same exact thing happens to me. ill be coming to a stop press the clutch and immediately start hearing the rev...been the mechanics and same deal..."everythings fine, but lets try this...blah blah"

I read some of the replies here to see if it could be any of those and just the same...everything is fine but still it revs.

Talked to my grandfather, whos a mechanic and said to check my Gas Filter. Idk if that might help u but ive yet to check mine to see if it works but if u do it before i get a chance and works...please let me know.

Hope that helps and might give u a new way to solve the problem.

Dear davila,

A clogged fuel filter that allows the car to start normally limits the volume of fuel flow. The symptoms above talk to a car revving to 2500 rpm, then dropping back down to a stall speed. this is not a clogged fuel filter. Now, if your car would not drive faster than 20 miles per hour it could be the fuel filter.

The causes for the sudden high rev still are:

a) possible vacuum leak or loose hose
B) throttle position sensor


You can use the method Eric suggested as this works. The sudden high rev problem really sounds like a vacuum leak.

Byron

thanks man. haha