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.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode