Shop Floor Talk  

Go Back   Shop Floor Talk > Welding and Metalworking Forums > Mechanical & Electrical

SFT Search:   
Thread Tools Display Modes
Old 02-11-2019, 04:57 PM
cutter's Avatar
cutter cutter is offline
Join Date: Jun 2004
Location: Lubbock,Texas
Posts: 32,596

Ted, this is probably not exactly relevant but this winter my old Jeep wouldn't start in cold weather. It's so old that it's pre-code reader ready so no help there.
But a little searching led me to a discussion that advised this model will not fire or start before the check engine light comes on, so turn the key on & wait. One guy said his Jeep sometimes took 30 minutes to come on. Mine is not that severely degraded - yet.

The problem turns out to be the old capacitors inside the Ignition Control Module getting weak with age & the cold prevents them from charging to a sufficient level to power the ICM. These modules are available for about $200 at the store or take your chance on ebay, of course.

Since we don't really get extreme cold temperatures here mine will usually activate the check engine light within 20-30 seconds. It does vary by how cold it is but at any temp above about 45° it comes on and starts immediately. Once we drop below 20°, I am in for a little bit more of a wait & she doesn't want to idle until the engine temp comes up a little bit, but that's the idle control unit - another small can of worms.

While I have no idea which of your truck components is failing in the cold there could be a weak capacitor somewhere in the woodpile. 2002 is certainly old enough for some capacitor degradation.
Housekeeping Staff: the Gatekeeper
Director of Policy, Syntax and Grammar (by appointment)

"Dr. Chandran, will I dream?"

Just Keep Walking

"Passionate hatred can give meaning and purpose to an empty life. Thus people haunted by the purposelessness of their lives try to find a new content not only by dedicating themselves to a holy cause but also by nursing a fanatical grievance. A mass movement offers them unlimited opportunities for both."
Eric Hoffer The True Believer 1951
Reply With Quote
Old 02-12-2019, 03:51 PM
digr's Avatar
digr digr is offline
The Real Deal
Join Date: Apr 2005
Location: Duluth MN
Posts: 7,829

Rod I think that you are on to something there I did a bunch of searching about this year truck and two different guys found that if they took their PCM (power control module) inside at nite their truck would start right up in the morning, one guy said he thought his truck was afraid the dark because it wouldn't start until after the sun came up.
Drawing by Smartdraw
Reply With Quote

Thread Tools
Display Modes

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

Forum Jump

Web Search:

All times are GMT -5. The time now is 05:12 AM.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2019, vBulletin Solutions Inc.