94 YJ idle too high - JeepForum.com
 
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post #1 of 12 Old 09-16-2019, 08:04 PM Thread Starter
Stormy663
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94 YJ idle too high

Is there any way to adjust the idle besides replacing the idle sensor? It idles between 1700 and 2000 rpm...way too high.

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post #2 of 12 Old 09-16-2019, 09:00 PM
bruinjeeper
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sure there is no vacuum leak?

Stop whining about the 'ride' - If your YJ ain't wrangling your soul free, then might I suggest you buy a stationwagon... at least you can fit all your bull**** in the back.
~YJOTM MAY '16~
~YJOTM JULY '19~
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post #3 of 12 Old 09-16-2019, 09:27 PM Thread Starter
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Not as far as I can tell
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post #4 of 12 Old 09-16-2019, 09:37 PM
bruinjeeper
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have you done any testing? If so, how?

Stop whining about the 'ride' - If your YJ ain't wrangling your soul free, then might I suggest you buy a stationwagon... at least you can fit all your bull**** in the back.
~YJOTM MAY '16~
~YJOTM JULY '19~
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post #5 of 12 Old 09-17-2019, 07:00 AM
Siva283
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I am voting vacuum leak and a pretty large one.

1995 YJ. 2 inch BDS Spring lift. 1 inch shackle lift. 1.25 inch JKS Body Lift 33x12.5x15's. Engo 10,000 pound winch.

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I gave the Jeep the required offering of $$, sweat, and blood, and everything works fine now. -- Jim
Quote:
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. It started with a $200 axle, and a few thousand dollars later I was done :)
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Originally Posted by Luuca View Post
diagnose the real issue before you start going all Obama on it - spending mad cash you'll need for other important things.

Ask me how I know...
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this is also my second set of RC springs this year. I'd rather spend the money again and get something that will last.
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post #6 of 12 Old 09-19-2019, 08:51 PM Thread Starter
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I've checked all of the vacuum lines and have replaced any that looked cracked. I'm replacing the MAP sensor in hopes that will fix it.
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post #7 of 12 Old 09-19-2019, 08:55 PM
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spray carb cleaner along all your vacuum lines while its running to see if the idle changes...whenever and if it does - that area is where your leak is. do not over look the rubber elbows and connectors

Stop whining about the 'ride' - If your YJ ain't wrangling your soul free, then might I suggest you buy a stationwagon... at least you can fit all your bull**** in the back.
~YJOTM MAY '16~
~YJOTM JULY '19~
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post #8 of 12 Old 09-19-2019, 08:56 PM
bruinjeeper
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wait... does it idle that high ALL the time, or just on start up?

Stop whining about the 'ride' - If your YJ ain't wrangling your soul free, then might I suggest you buy a stationwagon... at least you can fit all your bull**** in the back.
~YJOTM MAY '16~
~YJOTM JULY '19~
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post #9 of 12 Old 09-20-2019, 09:43 AM Thread Starter
Stormy663
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All the time. Higher at start up though.
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post #10 of 12 Old 09-23-2019, 07:43 AM
Siva283
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Quote:
Originally Posted by Stormy663 View Post
All the time. Higher at start up though.
this tells me your IAC is moving and responding so you most likely have a vacuum leak. WIth your engine off if you hold down the brake pedal does it hiss? It should while the pedal is moving but once it stops the his should too. If it keeps hissing bad brake booster. Also as ruinjeeper said carb cleaner is your friend. Use it to find your vacuum leak

1995 YJ. 2 inch BDS Spring lift. 1 inch shackle lift. 1.25 inch JKS Body Lift 33x12.5x15's. Engo 10,000 pound winch.

Quote:
Originally Posted by Magnum View Post
I gave the Jeep the required offering of $$, sweat, and blood, and everything works fine now. -- Jim
Quote:
Originally Posted by ldso View Post
. It started with a $200 axle, and a few thousand dollars later I was done :)
Quote:
Originally Posted by Luuca View Post
diagnose the real issue before you start going all Obama on it - spending mad cash you'll need for other important things.

Ask me how I know...
Quote:
Originally Posted by Overhead View Post
this is also my second set of RC springs this year. I'd rather spend the money again and get something that will last.
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post #11 of 12 Old 09-28-2019, 01:59 PM Thread Starter
Stormy663
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I have now checked all of the vacuum lines and replaced ones that were suspect. I have also replaced the MAP sensor. No change.
When I take the vacuum line off the MAP sensor, the idle goes down to 1000 but the idle is a bit rough. It is the only vacuum line that does this. All others have little to no effect.
Thoughts?
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post #12 of 12 Old 10-03-2019, 06:55 PM Thread Starter
Stormy663
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The leak is at the rear intake manifold connection. Thanks for all if your input
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