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02 ford explorer r.s tach prob.

Printed From: the12volt.com
Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=90947
Printed Date: May 10, 2025 at 12:10 PM


Topic: 02 ford explorer r.s tach prob.

Posted By: azn_fcuk
Subject: 02 ford explorer r.s tach prob.
Date Posted: February 24, 2007 at 10:41 PM

Ive installed a PolarStart into a 2002 Exploer Limited. Now im having a problem where the unit wont start because its seeing tach b4 the unit starts.

Ive gone to 2 differnt tach wires at the PCM and at the injector and the same problem. Ive test all the wires and whats happeneing is the tach wires are ground at rest and when you power up ignition it goes to 12volt and the r.s. thinks the cars has started.

Is there a better source for tach on this vehcile? or another way aroudn this?

Thanks for the replies.




Replies:

Posted By: mikvot
Date Posted: February 24, 2007 at 11:05 PM
For tach go to one of the ignition coils or coil pack and use the wire that is NOT WHITE/ lt. blue.

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Posted By: KarTuneMan
Date Posted: February 25, 2007 at 12:01 AM
TACH SIGNAL Pink/white At coil on top of engine   AC 


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Posted By: azn_fcuk
Date Posted: February 25, 2007 at 9:01 AM

mikvot wrote:
For tach go to one of the ignition coils or coil pack and use the wire that is NOT WHITE/ lt. blue.

yes i did also try it at the coil pack and it wouldnt work. First time ive ever had this problem errrr.




Posted By: flobee4
Date Posted: February 25, 2007 at 9:23 AM

I use a blue wire in one of the 2 thick wire loom against the firewall. on the passengers side.  i believe its in the upper one. I usually can't reach it, so i follow it till it heads more towards the passenger side and drops down. It's easier to reach there. So, try that one out, it works for me.

Frank




Posted By: azn_fcuk
Date Posted: February 25, 2007 at 11:18 AM
^   thanks i will



Posted By: azn_fcuk
Date Posted: February 25, 2007 at 3:34 PM

I also forgot to mention this is the V8 model, any differnece




Posted By: flobee4
Date Posted: February 25, 2007 at 6:55 PM

i'm not sure. Its usually don't check the engine size, i just go to the harness and use it.  so, i'm pretty sure its there regardless of engine size.  take a look to see if its there and test it to make sure.

Frank




Posted By: azn_fcuk
Date Posted: February 26, 2007 at 2:07 AM

Well what i had to do is build a realy to trip tach as that starter engages. Now it works, but after 30-45 sec the vehicle shuts down. Also every 2nd or 3rd try with the r.s. the vehcicle starts to ide surge.

Any thoughts on this problem?




Posted By: NowYaKnow
Date Posted: February 26, 2007 at 11:27 PM
When you learn tach are you letting the idle settle down? When you start these vehicle the rpms usually jump up to close to 2k, and then settle down pretty quickly which most starters don't like. And I usually use the blue/green or pink/white @ the coil pack. They should be right next to each other and either will work.

Mike



Posted By: azn_fcuk
Date Posted: February 27, 2007 at 12:40 PM

Hi Mike yes im letting the engine idle fall down to where its about 800-1000rpm.

Ive tried a newer unit ive tried learning tach at higher idle but no cigar. This polarstart unit just dosnt like this Explorer.

Ive already switched to a Compustar and ran Alt sensing, and it runs great now.

Anyways thanks for everyones input. Much appreciated :)


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