Sometime Tach - Ranger-Forums - The Ultimate Ford Ranger Resource

General Ford Ranger Discussion General discussion of the Ford Ranger that does not fit in any other sub-forum.

LinkBack Thread Tools Search this Thread
Old 08-31-2016
Thread Starter
Join Date: Aug 2016
Location: Little Rock, AR
Posts: 2
Sometime Tach

I have a 91 ford ranger with 2.3l engine. About 2 months ago the tach would work sometimes and other times it not work. When working the engine ran fine,but when the tach fell to 0 the engine had a miss. Now the tach has quit working all the time and engine has slight miss especially when idling. What would cause this problem. I was told that it might be the crankshaft position sensor. Any ideas?
Reply With Quote
Old 08-31-2016
RF Veteran
iTrader: (1)
Join Date: Jan 2014
Location: Vancouver, BC
Posts: 7,258
Welcome to the forum

1991 Ranger 2.3l gets tach signal from the ICM(ignition control module) located on the front of the intake manifold.
ICM runs the spark system, check wires they often get frayed/loose

Crank position(CKP) sensor is the main timing sensor for the ICM and the computer, engine will not start without a stable signal from that sensor, so no, not the CKP sensor.

But the misfire could be a problem with the ICM which are known to have issues when older, so tach issue and misfire could be symptom of ICM problem.
Many auto parts stores have testers for these ICMs, you bring in that module and they can test it.

And read here:

Last edited by RonD; 08-31-2016 at 09:30 AM.
Reply With Quote
Old 08-31-2016
Thread Starter
Join Date: Aug 2016
Location: Little Rock, AR
Posts: 2
Thanks for welcoming me into the forum RonD and thanks also for the information you supplied. My thoughts were on the crankshaft position sensor mainly but I did not know that I could get the ICM tested at the auto parts store. Will definitely check into that. thanks again.
Reply With Quote

Related Topics
Thread Thread Starter Forum Replies Last Post
gauge swap from no tach to with tach. i need some help ranger64 General Technical & Electrical 1 07-03-2014 12:28 AM
Tach or No Tach LastStarfighter New Ideas 9 02-11-2012 05:07 PM
Anyone want to meet up sometime and travel some seasonal roads. 2004FORDRANGER Meets, Greets, & Events 1 05-27-2009 12:52 PM
So Cal Meet Sometime summer. SparkYZ Meets, Greets, & Events 153 05-22-2009 04:23 PM
No Tach in 99 ranger...Will a 2001 cluster w/ a tach plug in and work? 01xltranger4x4 General Technical & Electrical 16 02-03-2006 11:53 PM

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

All times are GMT -6. The time now is 12:10 PM.