Extended Idle 97-01 Install

[Blaine B.]

I know which pin it is as I have seen a diagram for the PRE 96 XJ's however I thought I remember hearing that not all pre 96 OBD1 computers would accept the high idle modification.

Mine has the male pin on the PCM for the proper port for high idle but did not have the female recepticle in the PCM plug. I have some extras that I can insert into the PCM plug and give it a try, but I just wanted to make sure I would not fry anything.

I guess I'll have to try it one of these days now considering I have another ride now incase something goes bollocks!

 

[JEEPZZ]

Are some OBD-1 XJ's not equipped with this wire or pin? I took a quick peek and I swore the corresponding terminal for a 95 in OBD-1 (according to the chart) was not present on my PCM plug.

Manual trans XJ's and 2.5L XJ's do not have the ext idle circuit. Also anything older than 93.

 

[Blaine B.]

So basically my 95 with the 4.0 and AW4 should definitely work with the extended idle circuit as soon as I add the female connector into the plug?

 

[JEEPZZ]

So basically my 95 with the 4.0 and AW4 should definitely work with the extended idle circuit as soon as I add the female connector into the plug?

Get yourself a jumper wire or a test light, clamp one end to a good ground and probe the other to the #10 pin (on your 95). Your idle should jump up to the 1000-1200 range.

 

[Blaine B.]

Just did this "modification" with mine tonight, had to drill out the plug for pin #10 and then I added a pin. I did not add a switch but just have it grounded to the body for testing. It has no effect on my idle, I'm still idling (when in park or neutral of course) on the line directly below 1000..no change at all.

Anybody know what is the deal with this?​

 

[fyrfytr1717]

Damn, I was hoping your post was going to be a success story... Again, wish I could help but I have no wiring diagram for pre '97. Now here's a silly question, does that pin you installed in the hole you drilled out actually connect to anything behind it, or is it just floating in there?

 

[Blaine B.]

Wierd, I grounded pin #10 as specified and even used a stock female pin thing in the plug.

Unless there is a difference between the civilian and police computers for XJ's? Although I didn't think there were since they weren't really police fleet vehicles for the most part...sure you could order extended idle and a 120 mph speedometer as part of a package but that is as far as I thought it went.

 

[Blaine B.]

I remember seeing a post dedicated to the installation of the extended idle function in OBD1 equipped XJ's. I've searched Naxja and other forums and I can't seem to find it anymore. Bah!

 

[Root Moose]

Spidey-sense remembers something about that too. I may be muddling things but maybe it didn't use the PCM pin 12 thing but hooked into the power steering or air con idle raise switch instead. Or maybe that was a work around... Maybe try using those items in a search and see if it leads to different threads?

 

[Root Moose]

Have you seen this thread? It seems to mention some stuff about the older generation but I didn't read it close enough to see if it helps.

http://www.naxja.org/forum/showthread.php?t=35197

Post #21 says for the 1996 ground pin #12 which should be dark blue and orange.

HTH

 

[Blaine B.]

I found the original thread I was thinking of but there is a link in that thread linking to THIS thread lol!

 

[eleduardok]

I too cleaned out pin 10 on 95 Country as it was blocked and not female in main plug. male end is there on PCM. I have tried jumping it through various methods. Have not gotten proper insert for PCM plug but my juggling and all methods should have at least grounded it. It does nothing so far. Will work some more on it tomorrow.
Blaine B. Any luck with your pin 10 trials?

 

[Blaine B.]

No luck, there was pretty much only one trial and it hasn't worked since. Still grounded though.

BTW my 95 is a Country as well.

 

[eleduardok]

Man I swear I spent half a day here looking at EVERY thread on this. Seemed simple enough, yet no one has an answer? Does ANYONE have one that works on a 95? I idle my truck a lot on job sites and in the woods and could use this option. I will grab a spare PCM and the female inserts this week at JY. I was just going to run a non-lighted switch in cab to complete ground, but I am glad I tried before tearing into interior. frustrating as it seems so simple.

 

[Blaine B.]

I have NOT heard confirmation from anybody who did this to an OBD1 equipped XJ. Besides the ones showing police XJ's at the wrecker with the OEM switch on the dash. Maybe those PCM's are in fact different for the Police XJ's. Just how Ford police PCM's differer vastly from the civilian counterparts. But then why would Jeep have the same pcm's used for police and civilian vehicles for OBD2 equipped XJ's?

Like I said oh well, was worth the try.

 

[eleduardok]

So I went to the state library and looked at every reference I could find, all show same PCM for both models and pin 10 for the switch. Not being very electrical, it looked the same on all diagrams, just a choice of 2 different color wires depending on manufacture date. I am stumped. My buddy is an engineer for cummins coming over tonight, said he would look and see what he thought...
Not that important, but I hate getting beat. Ed

 

[Blaine B.]

I hope he figures something good out, lol...fingers crossed but doubtful.

 

[Blaine B.]

Anything new on this topic? I hope!

 

[eleduardok]

got busy and gave up for now.... upgrading electrical and new alternator will solve a lot of the issues for me, 140amp, plenty of amp down low, so things will be better. Seems no one knows anything about this, so I let it be.

 

[Blaine B.]

I am looking for a Denso 136amp from a 98 ZJ to upgrade, but that seems to be rather difficult. I was previously told that all Grand Cherokee Limited's had 136 amp but apparently that isn't so. Prior to 98 even the fully powered Limited ZJ's had 90 or 117 amp tops.