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Unread 11-25-2012, 08:51 PM   #1
lukeverkroost
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Join Date: Nov 2012
Posts: 9
please help

IVe owned my jeep for a couple of years now and I keep getting this problem where my electric radiator fan stops working and when the jeep starts it splutters on low revs for a sec then the revs rise up for a sec then drops back down and idles normaly! I don't know how the two problems are connected but they are because last time it happened I replaced the ecu and both problems went away that was about 10 months ago, now it's back again, it's starts funny n the fan isn't working! The big fuse clicks when I connect it but I have noticed that there isn't any power to the fan at the plug above the radiator! Could it be from a bad ecu? Also when my fan is going it's runs as soon as the motor is started and doesn't stop until the engine is stopped regardless if the engine is hot or cold! PLEASE help!!! Any info i would be greatfull, cheers from Australia

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Unread 11-25-2012, 09:59 PM   #2
redman87
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1964 CJ5 
 
Join Date: Oct 2011
Location: bowling green, ohio
Posts: 129
Check the temperature sensor it tells the ecm how the control the fuel mix for hot and cold conditions, idle speed ,and the cooling fan. Just a thought
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Unread 11-25-2012, 11:02 PM   #3
lukeverkroost
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Join Date: Nov 2012
Posts: 9
Quote:
Originally Posted by redman87
Check the temperature sensor it tells the ecm how the control the fuel mix for hot and cold conditions, idle speed ,and the cooling fan. Just a thought
Thanks for the info! The temp sensor is what I was thinking, that would explain how my jeeps been running since the fan stopped. By any chance would you know the location of the temp sensor on the 4.0 i-6, 97 cherokee xj and/or how I could check it? Thanks!
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Unread 11-30-2012, 02:40 PM   #4
itzfreddie
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2000 TJ Wrangler 
 
Join Date: Mar 2012
Location: Porter Ranch, California
Posts: 215
Cant find the post but i believe unlimited04 said "Are you familiar with the vapor lock & heat soak issues many of the 4.0L's get? the engine compartment gets heat soaked, and the fuel in the fuel rail gets vaporized = sputtering until the cool fuel gets up to the injectors & the vapors get cleared."
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Unread 08-31-2014, 06:51 AM   #5
lukeverkroost
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Join Date: Nov 2012
Posts: 9
Thanks, found out the problem it was the temp sensor. Im a bit late but... Better late then never. Thanks for the advice way back
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