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Unread 08-24-2013, 07:09 AM   #46
Que89YJ
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1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 15,473
I don't think he meant speed sensor. The pre 91 doesn't have one. I think he meant ais. The settings all need to be adjusted and by adjusting them you check to make sure they are working correctly. Got the pm but it sounds like you are doing ok. If you need more help let me know. Finding a replacement for the ait is difficult but the coolant temp sensor is a good replacement of you can get a connector for it or solder it.

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Unread 08-24-2013, 10:35 AM   #47
hotcobra03
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Location: poteet, texas
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Quote:
Originally Posted by XJ93 View Post
Okay, IAT does mess with air/fuel ratio, why do you want to mess with speed sensor?
1987-88 manual..section G pg7..shows speed sensor as input to pcm with others..

Crank sensor..is move able and I seen a jumper mentioned..

Its just something...

The isa motor. Was making clicking but it stopped..also before it would make a grinding gear sound after you turn off engine..that stopped also with just with sensor..

Just more to check out slowing

Test drive lastnite was about 25 miles..vs around block..

It has larger tires so speedo is off..it held 50-60 no problem..
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Unread 08-24-2013, 01:07 PM   #48
Que89YJ
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Location: Detroit, Michigan
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No speed input just the crank sensor.
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Unread 08-27-2013, 05:54 AM   #49
Que89YJ
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1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 15,473
Here is the adjustment procedure for the ISA from the book:


IDLE SPEED ACTUATOR (ISA) MOTOR
1) Adjust ISA motor plunger to establish initial position of
plunger only if motor has been removed or replaced. Remove air filter
elbow and start engine. Run engine until engine reaches normal
operating temperature. Turn A/C off (if equipped).
2) Connect tachometer leads to diagnostic connector D1,
attaching negative lead to terminal D1-3 and positive lead to
terminal D1-1. See Fig. 4. Turn ignition off. ISA motor plunger
should move to fully extended position.
3) When ISA motor plunger is fully extended, disconnect ISA
motor wiring connector and start engine. Engine speed should be
3300-3700 RPM. If incorrect, turn hex head screw at end of plunger to
provide engine speed of 3500 RPM.
4) Fully retract ISA motor by holding closed throttle (idle)
switch plunger inward as throttle is opened. Closed throttle switch
plunger should not touch throttle lever in closed position. If
contact is made, check linkage and/or cable for binding or damage.
Repair as necessary.
5) Connect ISA motor wiring harness connector and turn
ignition off for 10 seconds. ISA motor should move to fully extended
position. Start engine. Engine speed should be 3500 RPM for short
period of time and then decrease to normal idle speed.
6) Turn ignition off. Disconnect tachometer. After final
adjustment of ISA motor, use thread penetrating sealant (Loctite 290)
on adjustment screw to prevent movement and maintain adjustment.
NOTE: If adjustment screw must be moved after thread sealant
hardens, loosen threads by heating screw with flameless heat
such as soldering gun. DO NOT use flame or torch type of

heat as damage to ISA motor will result.
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Unread 08-27-2013, 09:53 AM   #50
hotcobra03
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Location: poteet, texas
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I have to remove isa motor..that nut on plunger needs to be loosened..its all the way in..

here are couple utube vids

cold start

isa motor jumping

hot idle

before adjusting isa

wish I took vid from start..

idle was 1200-1400 and engine would jump around .engine mounts are wiped out..
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Unread 08-27-2013, 10:25 AM   #51
Que89YJ
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1989 YJ Wrangler 
 
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Location: Detroit, Michigan
Posts: 15,473
I dont see any links. Are you saying it is idling good now?
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Unread 08-27-2013, 11:06 AM   #52
hotcobra03
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I have to try another link
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Unread 08-27-2013, 12:46 PM   #53
hotcobra03
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hold on im trying photobucket..you tube is being strange.I tpye in url and still no vid
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Unread 08-27-2013, 01:06 PM   #54
Que89YJ
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1989 YJ Wrangler 
 
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Location: Detroit, Michigan
Posts: 15,473
PM me and I will post it. You dont have enough post yet to link. I think it is 50 post to put up links and pics.
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Unread 08-27-2013, 01:26 PM   #55
hotcobra03
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I posted pics..i can email to u from cell..
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Unread 08-27-2013, 01:33 PM   #56
hotcobra03
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3 vids sent to email ..
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Unread 08-27-2013, 01:52 PM   #57
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Unread 08-27-2013, 02:15 PM   #58
hotcobra03
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Ttt
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Unread 08-27-2013, 02:19 PM   #59
hotcobra03
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Ttt
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Unread 08-27-2013, 02:25 PM   #60
hotcobra03
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Engine warm


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