94 chevy 4.3 only starts when cold......

junkman · 11-12-2008, 03:07 PM

i have a 94 chevy 1500 with a 4.3.when its cold it starts and runs fine for about 4 mins.then it dies and wont start just cranks all day.once its cold again it starts and does the same thing.no check engine light either.what could this be?????

87c10slammer · 11-12-2008, 08:44 PM

change your temp control sensor.. it will keep doing this unill you do... once the engine gets up to operating temp it thinks its overheating so it atomatically shuts the engine down.. kinda a safty feature but also a major pita

junkman · 11-12-2008, 09:44 PM

thanks,someone else metioned the temp sensor too but the parts store does not list one for the truck.do you know where it would be on the engine?

87c10slammer · 11-12-2008, 10:00 PM

autozone shows 2 for your truck.. one is the coolant temp sensor and is right near the gooseneck on the right side of the engine and the other is a temp switch that i cant seem to figure out where it is... but even inthe discription of the coolant temp sensor it mentions it sends a signal to the ecm... so that is your culpret... here it isso you can find it easier

and if your lucky enoguh to havge an autozone near you its part number SU109... looks like i did all your homework for you lol

junkman · 11-12-2008, 10:04 PM

wow! your awesome!thanks alot,i will get one tomorrow and put it in.

87c10slammer · 11-12-2008, 10:05 PM

anytime...

bradrhale · 11-13-2008, 06:44 AM

isnt the temp switch on the drivers side of the block about half way back??

87c10slammer · 11-13-2008, 11:15 AM

yeah i think it is... right by the manifold onthe side of the head... its only a single wire plug

junkman · 11-13-2008, 07:20 PM

thanks for the info,i fixed it and sold it today!now i can spend the money on my blazer......

87c10slammer · 11-13-2008, 07:35 PM

cool least you got her fixed.. what blazer do you have? a few of the guys on here have blazers that could help you out with some stuff.. me i have a jimmy so i am one of them.. what are the mods or fixes you have to do to it?

11-12-2008, 03:07 PM	#1
junkman Full Member Join Date: Nov 2008 Location: franklin mass Posts: 28	94 chevy 4.3 only starts when cold...... i have a 94 chevy 1500 with a 4.3.when its cold it starts and runs fine for about 4 mins.then it dies and wont start just cranks all day.once its cold again it starts and does the same thing.no check engine light either.what could this be?????

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11-12-2008, 08:44 PM	#2
87c10slammer Banned Join Date: Mar 2008 Location: levittown pa Posts: 2,197	change your temp control sensor.. it will keep doing this unill you do... once the engine gets up to operating temp it thinks its overheating so it atomatically shuts the engine down.. kinda a safty feature but also a major pita

11-12-2008, 09:44 PM	#3
junkman Full Member Join Date: Nov 2008 Location: franklin mass Posts: 28	thanks,someone else metioned the temp sensor too but the parts store does not list one for the truck.do you know where it would be on the engine?

11-12-2008, 10:00 PM	#4
87c10slammer Banned Join Date: Mar 2008 Location: levittown pa Posts: 2,197	autozone shows 2 for your truck.. one is the coolant temp sensor and is right near the gooseneck on the right side of the engine and the other is a temp switch that i cant seem to figure out where it is... but even inthe discription of the coolant temp sensor it mentions it sends a signal to the ecm... so that is your culpret... here it isso you can find it easier and if your lucky enoguh to havge an autozone near you its part number SU109... looks like i did all your homework for you lol

11-12-2008, 10:04 PM	#5
junkman Full Member Join Date: Nov 2008 Location: franklin mass Posts: 28	wow! your awesome!thanks alot,i will get one tomorrow and put it in.

11-12-2008, 10:05 PM	#6
87c10slammer Banned Join Date: Mar 2008 Location: levittown pa Posts: 2,197	anytime...

11-13-2008, 06:44 AM	#7
bradrhale Senior Moderator Join Date: Apr 2006 Location: Texas Posts: 8,030	isnt the temp switch on the drivers side of the block about half way back??

11-13-2008, 11:15 AM	#8
87c10slammer Banned Join Date: Mar 2008 Location: levittown pa Posts: 2,197	yeah i think it is... right by the manifold onthe side of the head... its only a single wire plug

11-13-2008, 07:20 PM	#9
junkman Full Member Join Date: Nov 2008 Location: franklin mass Posts: 28	thanks for the info,i fixed it and sold it today!now i can spend the money on my blazer......

11-13-2008, 07:35 PM	#10
87c10slammer Banned Join Date: Mar 2008 Location: levittown pa Posts: 2,197	cool least you got her fixed.. what blazer do you have? a few of the guys on here have blazers that could help you out with some stuff.. me i have a jimmy so i am one of them.. what are the mods or fixes you have to do to it?