loss of power

Butch Jones · 05-07-2009, 08:48 AM

im lossing power in my 2003 4.8 mainly when it gets hot
im thinking its the converters any suggestions

bradrhale · 05-07-2009, 09:21 AM

is the SEL light on?? converter would be a good guess as to power failure. how many miles do you have on it??

Butch Jones · 05-07-2009, 12:15 PM

i just turned 100000 and there is no lights on

bradrhale · 05-07-2009, 03:40 PM

any signs of hesitation or miss?? i know i am asking alot of question but am trying to rule out other possibilities for you before lots of money is spent chasing the tail. when was the last time you did a tune up??

Butch Jones · 05-08-2009, 05:48 AM

i just changed the plugs and wires
it has a slight hesitation when its hot
i have a cold air intake which i clean on a rgular basis
im also losing antifreeze somewhere i cant find any leaks when im towing its running really hot

bradrhale · 05-08-2009, 06:53 AM

how much coolant are you losing?? could be an intake gasket leaking if you cant seem to locate a leak anywhere.
as for your hesitation, might be a great time to have it scanned. this should tell you any problems that the truck is encountering when up to operating temps. should also tell you if the cat is beginning to let loose.

Butch Jones · 05-08-2009, 07:27 AM

how much trouble is it to change the gasket
can i get a scan done anywhere

Butch Jones · 05-08-2009, 07:39 AM

when im towing i lose more but on average im losing about a quart every 2 weeks

.ben · 05-08-2009, 08:24 AM

a quart every 2 weeks is too much its probably the intake gasket hopefully not the head gasket....

my truck was losing power when hot like yours and it turned out to be a bad fuel pump but yours sounds a bit differnt in symtoms....

gmctrucks · 05-08-2009, 10:39 AM

You really need to do that pressure test that radiator shops do or if you have the kit go for it because you need to know exactly where it's leaking from.
Good luck! GMC
PS-Ask a auto parts store maybe they can loan you one.

05-07-2009, 08:48 AM	#1
Butch Jones Full Member Join Date: May 2009 Location: baltimore MD Posts: 21	loss of power im lossing power in my 2003 4.8 mainly when it gets hot im thinking its the converters any suggestions

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05-07-2009, 09:21 AM	#2
bradrhale Senior Moderator Join Date: Apr 2006 Location: Texas Posts: 7,831	is the SEL light on?? converter would be a good guess as to power failure. how many miles do you have on it??

05-07-2009, 12:15 PM	#3
Butch Jones Full Member Join Date: May 2009 Location: baltimore MD Posts: 21	i just turned 100000 and there is no lights on

05-07-2009, 03:40 PM	#4
bradrhale Senior Moderator Join Date: Apr 2006 Location: Texas Posts: 7,831	any signs of hesitation or miss?? i know i am asking alot of question but am trying to rule out other possibilities for you before lots of money is spent chasing the tail. when was the last time you did a tune up??

05-08-2009, 05:48 AM	#5
Butch Jones Full Member Join Date: May 2009 Location: baltimore MD Posts: 21	i just changed the plugs and wires it has a slight hesitation when its hot i have a cold air intake which i clean on a rgular basis im also losing antifreeze somewhere i cant find any leaks when im towing its running really hot

05-08-2009, 06:53 AM	#6
bradrhale Senior Moderator Join Date: Apr 2006 Location: Texas Posts: 7,831	how much coolant are you losing?? could be an intake gasket leaking if you cant seem to locate a leak anywhere. as for your hesitation, might be a great time to have it scanned. this should tell you any problems that the truck is encountering when up to operating temps. should also tell you if the cat is beginning to let loose.

05-08-2009, 07:27 AM	#7
Butch Jones Full Member Join Date: May 2009 Location: baltimore MD Posts: 21	how much trouble is it to change the gasket can i get a scan done anywhere

05-08-2009, 07:39 AM	#8
Butch Jones Full Member Join Date: May 2009 Location: baltimore MD Posts: 21	when im towing i lose more but on average im losing about a quart every 2 weeks

05-08-2009, 08:24 AM	#9
.ben Full Member Join Date: Apr 2009 Posts: 15	a quart every 2 weeks is too much its probably the intake gasket hopefully not the head gasket.... my truck was losing power when hot like yours and it turned out to be a bad fuel pump but yours sounds a bit differnt in symtoms....

05-08-2009, 10:39 AM	#10
gmctrucks Senior Member Join Date: Nov 2006 Location: Houston,Texas Posts: 3,945	You really need to do that pressure test that radiator shops do or if you have the kit go for it because you need to know exactly where it's leaking from. Good luck! GMC PS-Ask a auto parts store maybe they can loan you one.