Complete Mystery !!!!
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Complete Mystery !!!!
My 2000 Caravan is going on its second year of responding negetively to the heat. Last June it would not respond to a key start. Trying all the likely simple solutions , it then decided to start. I replaced the ignition switch, removed a add on theft system, yet it continued. Everything will come on, but when you turn the key, the selonid does not connect, it will not even turn on the fuel pump. Last fall, it began to work properly every time and went thru the winter without trouble. Two weeks ago, on a warm day, it again refused to respond. I considered the fact that the only thing that has changed was the temperture. I opened the windows and pushed it in to the shade, 5 minutes later it roared to life without incidence! Since then I have kept it in the shade and windows opened and have not had trouble. I have checked wires, had a scan, no troubles, yet it randomly will leave me stranded. Any ideas to solve my mystery? I can not be the only victim of this anommally can I?
Mopar Lover
Joined: Mar 2009
Posts: 837
Likes: 2
From: Springfield NE
the first thing that comes to mind is the starter itself and the starter solenoid. Starters dont like to work when they get hot. If the solenoid is not grounded well that could cause intermittent problems also.. Need to find out where the fuel pump is getting its power from. Is there a fuel pump relay to check? If the relay gets its power from the starter solenoid or starter relay, that might explain the symptoms. I dont think the ignition switch would give any trouble.
I used to have a GTO in high school and I used to carry around a gallon of water and a 3ft. section of garden hose. The hedders would heat up the starter and nothing would happen when I went to restart it. So; break out water and hose and cool down starter by pouring water on the starter through the hose. Voila! started right up.
Anyway, I dont know if any of this is gonna help your situation but, I wish you the best of luck with it. Keep us up to date if you can, Im interested to hear the fix or whats causing it. ...ENJOY!!...
I used to have a GTO in high school and I used to carry around a gallon of water and a 3ft. section of garden hose. The hedders would heat up the starter and nothing would happen when I went to restart it. So; break out water and hose and cool down starter by pouring water on the starter through the hose. Voila! started right up.
Anyway, I dont know if any of this is gonna help your situation but, I wish you the best of luck with it. Keep us up to date if you can, Im interested to hear the fix or whats causing it. ...ENJOY!!...
Mopar Lover
Joined: Apr 2009
Posts: 1,892
Likes: 4
From: Michigan: The First Line of Defense From The Canadians!
Strange cause he says the car wont start when the ambient air temp is high, but once its running, its ok, ie; no hot start problems. Seems that if it was under the hood, the high temps would cause him restart problems and strand him all the time. I suggest RTFM and get a DMM and trace the inside if the car to start.
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Seems similiar to my friend's car problems. I'd suggest an ICM, ECM or a BCM problem. Find out which module controls the ignition. My friends car, a Dodge Intrepid had a similiar problem when it got hot. His problem started about a year after an after market alarm and remote starter was added. If the installers did not work properly and make the proper connections, then something got fried. It's been suggested that one of the solder joints was weakened and when it gets hot it expands apart and vise versa. His was solved by a new ICM. Seems like a good place for you to start too. But find out if the ignition is "controlled" by the ICM or ECM. Scans were of no use to him either as they all said everything was okay. I'm just a hack mechanic who stumbled acrossed the solution for my friend so my advice is worth what you paid.
Do a "NO BUS" search on the internet and dig around a little (more like a lot!) until you find a site that has lots of problems listed. I read them all until I found a little somehting. I was shocked to find so many Jeep, Durango, Interpid and minivans with the same problem of heat setting off electronic problems. You'll read through about a hundred and I'll bet you'll find one real close to your problem.
Good luck!
Do a "NO BUS" search on the internet and dig around a little (more like a lot!) until you find a site that has lots of problems listed. I read them all until I found a little somehting. I was shocked to find so many Jeep, Durango, Interpid and minivans with the same problem of heat setting off electronic problems. You'll read through about a hundred and I'll bet you'll find one real close to your problem.
Good luck!
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your vehicle is newer than what i'm used to workyng on but i'll throw out some general logic.
you'll need to check some wiring diagrams to see at what point the power is shared between the fuel pump and the starter solenoid. you might find some sort of safety cut out in there somewhere.
have you tried staring in neutral and wiggle the shifter while cranking?
doesthe cengine crank when you jump the starter solenoid?
you'll need to check some wiring diagrams to see at what point the power is shared between the fuel pump and the starter solenoid. you might find some sort of safety cut out in there somewhere.
have you tried staring in neutral and wiggle the shifter while cranking?
doesthe cengine crank when you jump the starter solenoid?
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Mystery continues
Thank you for all the replys as of now. Just to add, This often happens when auto has stood all day and engine compartment is ambient temperture. The ecm's are on each side under the hood. Yes, have played with position of gears thinking the neutral switch was a possability, to no avail. Will take any advice recieved gladly and work on the auto later this week. Thanks again, steve
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