High idle issues: revisted

Whizbang · 08-12-2008, 07:14 AM

okay, i still have not found a good solution to my high idle problems and its driving me up a wall.

Here is what the car is doing:

Generally in the morning, ill start the car, it revs high for the 3k warm up, i tap the throttle it goes down to about 2000 rpms. During the course of driving to work, it usually tried to idle between 2000 and 2500 rpms. During lunch time i will choose to idle between normal and 2000 depending on the day. I have watched it idle at about 800 rpms fine. Then just start climbing to 2000 or higher.

What sensors, if not reading properly, can cause such idle issues? I have also noticed the car is running richer (more pops out of the exhaust) and i am thinking they are related.

Boostmaniac · 08-13-2008, 02:36 AM

Possible vacuum leaks can cause this.

Or you have a massive bridgeport and you just don't want to say that

Whizbang · 08-13-2008, 06:50 AM

could a bad BAC cause it?

Boostmaniac · 08-13-2008, 10:40 AM

I guess it could, but it doesn't seem likely. Have you checked for leaks yet?

Whizbang · 08-13-2008, 11:30 AM

i have but didnt find anything. I am going to look the TID over off the car though

RETed · 08-14-2008, 05:55 AM

It sounds like the cold start thermowax is sticking, or the TB itself is sticking.

-Ted

Whizbang · 08-14-2008, 07:14 AM

would that cause the idle to increase while its sitting though? i was under the impression the thermowax doesnt go about 1500 anyway. Hmmm...well i could remove it and see what happens.

TehMonkay · 08-14-2008, 10:26 AM

I'd probably say its the thermowax as well. I was having the same issue i'm almost sure of it.

Whizbang · 08-14-2008, 11:18 AM

alright well i will try to remove it this weekend and see what happens.

Boostmaniac · 08-14-2008, 12:07 PM

I have had a TB stick slightly open, about .5mm and that caused one HELL of a high idle.

Check thermowax, then see if you can actually shut the TB with your hand to drop the idle. If not, let us know.

RETed · 08-14-2008, 10:03 PM

Try this for a test...
Stick your foot under the gas pedal and lift up.
Does the idle want to drop?
If it does, then it's most likely a sticking TB.
Remove TB and shoot an entire can of brake cleaner or carb cleaner into the bores to clean all the crap out.

-Ted

RETed · 08-14-2008, 10:04 PM

Wait, I just taught of something really obvious...
Check the throttle cable tension...
DOH.

-Ted

Whizbang · 08-15-2008, 02:03 PM

Quote:

Originally Posted by RETed

Try this for a test...
Stick your foot under the gas pedal and lift up.
Does the idle want to drop?
If it does, then it's most likely a sticking TB.
Remove TB and shoot an entire can of brake cleaner or carb cleaner into the bores to clean all the crap out.

-Ted

this doesn't effect it

Whizbang · 08-15-2008, 02:04 PM

Quote:

Originally Posted by RETed

Wait, I just taught of something really obvious...
Check the throttle cable tension...
DOH.

-Ted

ill see if i can loosen the cable and start it up

08-12-2008, 07:14 AM	#1
Whizbang Respecognize! Join Date: Jul 2008 Location: Δx = ħ/2Δp iTrader: (5) Posts: 3,190 Rep Power: 20	High idle issues: revisted okay, i still have not found a good solution to my high idle problems and its driving me up a wall. Here is what the car is doing: Generally in the morning, ill start the car, it revs high for the 3k warm up, i tap the throttle it goes down to about 2000 rpms. During the course of driving to work, it usually tried to idle between 2000 and 2500 rpms. During lunch time i will choose to idle between normal and 2000 depending on the day. I have watched it idle at about 800 rpms fine. Then just start climbing to 2000 or higher. What sensors, if not reading properly, can cause such idle issues? I have also noticed the car is running richer (more pops out of the exhaust) and i am thinking they are related. __________________ For current updates and event coverage check out Follow on Twitter! @WhizbangRally Whizbang Rally's Webpage \| Facebook

08-13-2008, 06:50 AM	#3
Whizbang Respecognize! Join Date: Jul 2008 Location: Δx = ħ/2Δp iTrader: (5) Posts: 3,190 Rep Power: 20	could a bad BAC cause it? __________________ For current updates and event coverage check out Follow on Twitter! @WhizbangRally Whizbang Rally's Webpage \| Facebook

08-13-2008, 11:30 AM	#5
Whizbang Respecognize! Join Date: Jul 2008 Location: Δx = ħ/2Δp iTrader: (5) Posts: 3,190 Rep Power: 20	i have but didnt find anything. I am going to look the TID over off the car though __________________ For current updates and event coverage check out Follow on Twitter! @WhizbangRally Whizbang Rally's Webpage \| Facebook

08-14-2008, 07:14 AM	#7
Whizbang Respecognize! Join Date: Jul 2008 Location: Δx = ħ/2Δp iTrader: (5) Posts: 3,190 Rep Power: 20	would that cause the idle to increase while its sitting though? i was under the impression the thermowax doesnt go about 1500 anyway. Hmmm...well i could remove it and see what happens. __________________ For current updates and event coverage check out Follow on Twitter! @WhizbangRally Whizbang Rally's Webpage \| Facebook

08-14-2008, 10:26 AM	#8
TehMonkay Rotary Fanatic Join Date: Apr 2008 Location: Louisville, KY iTrader: (0) Posts: 302 Rep Power: 17	I'd probably say its the thermowax as well. I was having the same issue i'm almost sure of it. __________________ My car blows up everytime I start it, it's rotary

08-13-2008, 02:36 AM	#2
Boostmaniac Rotary Fanatic Join Date: Apr 2008 iTrader: (0) Posts: 182 Rep Power: 0	Possible vacuum leaks can cause this. Or you have a massive bridgeport and you just don't want to say that

08-13-2008, 10:40 AM	#4
Boostmaniac Rotary Fanatic Join Date: Apr 2008 iTrader: (0) Posts: 182 Rep Power: 0	I guess it could, but it doesn't seem likely. Have you checked for leaks yet?

08-14-2008, 11:18 AM	#9
Whizbang Respecognize! Join Date: Jul 2008 Location: Δx = ħ/2Δp iTrader: (5) Posts: 3,190 Rep Power: 20	alright well i will try to remove it this weekend and see what happens. __________________ For current updates and event coverage check out Follow on Twitter! @WhizbangRally Whizbang Rally's Webpage \| Facebook

08-14-2008, 12:07 PM	#10
Boostmaniac Rotary Fanatic Join Date: Apr 2008 iTrader: (0) Posts: 182 Rep Power: 0	I have had a TB stick slightly open, about .5mm and that caused one HELL of a high idle. Check thermowax, then see if you can actually shut the TB with your hand to drop the idle. If not, let us know.