|
|
03' Tiburon, Low Idle With A/C On?
|
|
|
| |
|
|
devon_t_2007
User
Jul 3, 2011, 11:16 AM
Post #1 of 20
(4523 views)
|
|
03' Tiburon, Low Idle With A/C On?
|
Sign In
|
|
Hello all, I have recently been driving around an 03' Hyundai Tiburon, 2.0L 4cyl and I noticed an issue when sitting at idle with the air conditioner on. When the car is started/at idle with the A/C on the car starts shaking like crazy and the RPMs drop down to 500 and feels like the cars going to die. If I give the car some gas or turn off the A/C the car runs perfect at 750rpm with the A/C off. It seems to me that for some reason the car is not compensating for the increased load on the engine? I know very very little about this car and have no idea where any of the sensors are. Also, there are no check engine lights currently. Thanks for any help I receive!!
Some more information I can tell you is that this car is a salvage title car that has been rebuilt, it has just had bent motor mounts replaced but overall it runs very well.
|
|
| |
|
|
Discretesignals
Ultimate Carjunky
/ Moderator
Jul 8, 2011, 6:58 PM
Post #2 of 20
(4485 views)
|
|
Re: 03' Tiburon, Low Idle With A/C On?
|
Sign In
|
|
Obviously the PCM is getting the ac command because the compressor is coming on. That means the PCM should open up the ISA to compensate for the load. Does the cooling fan kick on when you turn on the AC compressor?
Are there any trouble codes being stored? Have you attempted to clean the throttle body?
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
|
|
| |
|
|
Tom Greenleaf
Ultimate Carjunky
/ Moderator
Jul 9, 2011, 4:05 AM
Post #3 of 20
(4477 views)
|
|
Re: 03' Tiburon, Low Idle With A/C On?
|
Sign In
|
|
Quote">>Some more information I can tell you is that this car is a salvage title car that has been rebuilt, it has just had bent motor mounts replaced but overall it runs very well.<<"
Will A/C work well and quietly if you give this higher idle or while driving along? Car was totalled once with salvage title and bent motor mounts! No telling unless you know how hard it was hit and what it took to fix up and even then stuff happens. Compressor may be on it's way out and dragging so hard that compensation for normal load expected can't be covered or improperly tended to or left open with a hard hit to front it seems would have opened the system up to air and if left too long like that oils used (PAGs) can become acidic but would take a while to begin to wreck the system.
With a helper holding idle up see if you can detect compressor struggling. If so I'd disconnect it at its clutch and tie the wire away to a harmelss area,
T
|
|
| |
|
|
Tom Greenleaf
Ultimate Carjunky
/ Moderator
Jul 9, 2011, 5:12 PM
Post #6 of 20
(4457 views)
|
|
Re: 03' Tiburon, Low Idle With A/C On?
|
Sign In
|
|
If engine is idling too low for any reason it would stumble a bit before stalling. Why are you "excessively" pumping brakes? Should have ABS and not require that style of braking. Also asking a window to go up when already done is sucking up juice and alternator is a load too.
There may be codes stored leading to why it won't hold a proper idle with loads as it should even without the light on so should be checked. It obviously isn't sending the signal to cover loads. Pumping brakes is taking up engine vacuum if repeated doing that but should be covered too so I think this is one fault. Finding it is the hard part,
T
|
|
| |
|
|
Discretesignals
Ultimate Carjunky
/ Moderator
Jul 10, 2011, 10:10 AM
Post #8 of 20
(4440 views)
|
|
Re: 03' Tiburon, Low Idle With A/C On?
|
Sign In
|
|
Generic OBD2 data stream information. Don't really see anything unusual in those two data streams you provided other than the difference in RPM signals.
Did you attempt cleaning the throttle body to see if it resolves your issue? That would be the first place I would start. Inspect the idle speed motor. I had one on an Elantra that had a crack on the bottom of it that showed up during a smoke test. The crack was messing around with the fuel trims. Your trims look normal.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
|
|
| |
|
|
devon_t_2007
User
Jul 10, 2011, 11:37 AM
Post #9 of 20
(4433 views)
|
|
Re: 03' Tiburon, Low Idle With A/C On?
|
Sign In
|
|
I've never had to clean the throttle body on a car before, what is the best method?
|
|
| |
|
|
Hammer Time
Ultimate Carjunky
/ Moderator
Jul 10, 2011, 12:21 PM
Post #10 of 20
(4426 views)
|
|
Re: 03' Tiburon, Low Idle With A/C On?
|
Sign In
|
|
Remove the intake snorkel, have someone hold the throttle wide open for you and scrub the back side of the throttle plate and surrounding bore with an old tooth brush and some carb cleaner. Be sure to spray some into the small holes next to the throttle plate. That should help stabilize the idle. If it still has a problem, replace the IAC.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
|
|
| |
|
|
Discretesignals
Ultimate Carjunky
/ Moderator
Jul 11, 2011, 8:39 PM
Post #13 of 20
(4392 views)
|
|
Re: 03' Tiburon, Low Idle With A/C On?
|
Sign In
|
|
If you think the compressor may be bogging the engine down, you could hook up a set of ac gauges to the system and monitor pressures. If the compressor has 350 psi or more on the high side, that could bog the engine down.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
|
|
| |
|
|
Discretesignals
Ultimate Carjunky
/ Moderator
Jul 12, 2011, 5:37 PM
Post #15 of 20
(4369 views)
|
|
Re: 03' Tiburon, Low Idle With A/C On?
|
Sign In
|
|
So, just hook the AC gauage up to the high pressure port on the AC and see what the PSI reading is?
Pretty much. If you have too much pressure on the high side, it will take a lot more power to turn the compressor. Being that it's a 4 cylinder spinning the compressor, idle speed changes will be more noticeable with a loaded up compressor.
There is usually a reason if the high side pressure is really high, but we'll cross that fence if you come to it.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Jul 12, 2011, 5:38 PM)
|
|
| |
|
|
devon_t_2007
User
Jul 13, 2011, 3:29 PM
Post #16 of 20
(4351 views)
|
|
Re: 03' Tiburon, Low Idle With A/C On?
|
Sign In
|
|
So, just hook the AC gauage up to the high pressure port on the AC and see what the PSI reading is? Pretty much. If you have too much pressure on the high side, it will take a lot more power to turn the compressor. Being that it's a 4 cylinder spinning the compressor, idle speed changes will be more noticeable with a loaded up compressor. There is usually a reason if the high side pressure is really high, but we'll cross that fence if you come to it.
Okay and the results are in, after running my A/C full blast with a set of A/C gauges for about 3 minutes the high side stayed around 250 PSI while the low side kept bouncing from 60 to over 70 PSI which 60 is in the yellow and 70 is in the danger red part of the gauge. I have no idea what that means but that is what I got out of it!
Also something strange but is it normal to get like oily liquid coming out of the port because now my gauges are covered in this oily stuff.
(This post was edited by devon_t_2007 on Jul 13, 2011, 4:00 PM)
|
|
| |
|
|
Discretesignals
Ultimate Carjunky
/ Moderator
Jul 13, 2011, 5:40 PM
Post #17 of 20
(4337 views)
|
|
Re: 03' Tiburon, Low Idle With A/C On?
|
Sign In
|
|
The oily liquid is refrigerant oil. When you connected your gauges did some gas leak out? If so, some oil may come out with it.
The pressures are a little high unless it is hot in the cabin. What was the ambient air temps and outlet temps in the car when this was going on? What is the pressures with the windows up, on recirculate, and low blower?
Is the engine fan running with the ac on? Spray the condenser with a water hose and see if the pressures come down and the idle improves. You may need to have an ac specialist take a look at it.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Jul 13, 2011, 6:28 PM)
|
|
| |
|
|
devon_t_2007
User
Aug 8, 2011, 9:36 AM
Post #18 of 20
(4194 views)
|
|
Re: 03' Tiburon, Low Idle With A/C On?
|
Sign In
|
|
Okay, I'm bringing this thread back because I have been having some more issues which may all be related to the same thing. About 2 or 3 days ago I got another error code on my car, I do not remember the number but it related to the Catalytic converter, something was excessive. Now....when I was driving today I noticed that the idle on my car was extremely high, around 1200 RPM when just sitting at idle, it flagged 2 codes that were the same thing, they were both P0507. I have to say that when having the air conditioner on at idle the car doesn't shake like it did before but now I have constant high idle. Any ideas? Should I go ahead and spray the rest of my throttle body cleaner into the tb?
|
|
| |
|
|
Discretesignals
Ultimate Carjunky
/ Moderator
Aug 8, 2011, 7:21 PM
Post #19 of 20
(4172 views)
|
|
Re: 03' Tiburon, Low Idle With A/C On?
|
Sign In
|
|
Basically P0507 means the engine speed doesn't agree with the ISA (idle speed actuator) command. Normally you would hook up a high end scan tool and attempt to control the ISA. You would also check for vacuum leaks.
Either you developed a vacuum leak after the ISA or the ISA is faulty. The ISA is a rotary type valve. The valve can stick from carbon build up or even have a faulty coil. You can ohm check the two coils in the ISA with an ohm meter.
Terminals 1 and 2 should be 16-18 ohms and 2 and 3 terminals should be 14-16 ohms at 68 degrees F. in the ISA connector cavity.
I would disregard the catalyst code until you solve your drive-ability problem first.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Aug 8, 2011, 7:24 PM)
|
|
| |
|
|
Sidom
Veteran
/ Moderator
Aug 8, 2011, 7:55 PM
Post #20 of 20
(4157 views)
|
|
Re: 03' Tiburon, Low Idle With A/C On?
|
Sign In
|
|
I'm just going to add a quick suggestion...
I see where you have changed the mounts but just for the heck of it while it shaking in gear I would jack the engine with a floor jack & block of wood, just enough to get the weight off the engine....... Just to rule out a mount problem....I see where you said something was "bent", so I don't know if there are some mount issues or not... If it smooths out when jacked up, you have a mount issue
To make things worse, you've got a 507, rpm too high, so you may need to get that resolved 1st...But double checking the mounts only takes a few minutes to do and wouldn't be a bad idea
|
|
| |
|
Auto Repair Home
SEARCH
WHO'S 
LOG 
2006 Toyoto Camry XLE Driver Side Electric Window Trouble
Tierod end change caused some kind of leak
Grounding Cable, 2017 Jeep Renegade Trailhawk
equipment
Howdy
