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No power when hot

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Willybill
User

Jun 11, 2010, 11:23 AM

Post #1 of 5 (1832 views)
No power when hot Sign In
1990 GMC k1500 4.3 w/154,200 miles. new plugs,wires,rotor,cap, and complete axhaust (crossover to tailpipe). Starts and runs good, but take it on the road 3 miles and get into a hill and no power (15 mph). Get back on the level and it will pick up speed.


(This post was edited by Willybill on Jun 12, 2010, 4:15 AM)


zmame
Veteran / Moderator
zmame profile image

Jun 11, 2010, 8:08 PM

Post #2 of 5 (1827 views)
Re: No power when hot Sign In
bad for coils and distributor shafts cracking if im not mistaken


Sidom
Veteran / Moderator
Sidom profile image

Jun 11, 2010, 8:12 PM

Post #3 of 5 (1826 views)
Re: No power when hot Sign In
Not the easiest to check fuel pressure but it might not be a bad idea to take a look in this case.............


re-tired
Veteran / Moderator
re-tired profile image

Jun 11, 2010, 8:47 PM

Post #4 of 5 (1824 views)
Re: No power when hot Sign In
Dont know if this will help. Several yrs ago I owned a jeep wagoneer with a similar condition on the level road seemed fine . Try to go up one of florida's many mountains (BOAT RAMP)and it would not move. It was a struggle to go up expressway on ramps. Turns out the torque converter was bad .As Sidom said check fuel system first >>> its easier and cheaper.


LIFE'S SHORT GO FISH

(This post was edited by re-tired on Jun 12, 2010, 6:22 AM)


Willybill
User

Jun 12, 2010, 4:33 AM

Post #5 of 5 (1810 views)
Re: No power when hot Sign In
Thanks for the input. Yesterday I was reading in my Chilton book about the transmission and came to the part about Downshift Relay and Speed Sensor, can anyone tell me if they can be tested and how? Yesterday I also took the truck half way down the hill I lost speed on. I turned around and went back up the hill at 35 mph. I didn't let it shift to third until I got to the top of the hill. When it shifted it continued to gain speed. As I remember it the truck didn't downshift before when I came to the hill at 45 mph. Could this be the problem?





 
 
 






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