HELP ... Coolant loss/Power loss
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Joined: Sep 2004
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From: N. Idaho
HELP ... Coolant loss/Power loss Ok
I need a bona fide guru!
I have a 99.5 5.3 Chevy Silverado with 34,000 miles. Truck sat for 3 years. I have now resurrected it. Have put 3 x-Pipe, new cats, K&N drop in, Taylor wires, Iridium plugs, Westers tune. Soon to get e-fans and Aem filter set up.
PROBLEM #1. when WOT the truck spews coolant out the overflow. Though it was a junk stat, put in new stat, had coolant system flushed and rad rodded out. Still under WOT spews coolant out the overflow hose.
Problem #2 Dont know if the two are connected am loosing power, running rich on bank 2 (-9.2). Think truck is running rich on that side, then the computer is calling for it to lean out which gives very bad S/Knock and loss of power. Thought this was bad O2 scanner said the heater in O2 was not working so we replaced it. I am at my wits end.
???? . could there be a bad head gasket causing pressure in coolant under WOT and leaning it out under WOT? Would a vacuum leak cause this?
I have a 99.5 5.3 Chevy Silverado with 34,000 miles. Truck sat for 3 years. I have now resurrected it. Have put 3 x-Pipe, new cats, K&N drop in, Taylor wires, Iridium plugs, Westers tune. Soon to get e-fans and Aem filter set up.
PROBLEM #1. when WOT the truck spews coolant out the overflow. Though it was a junk stat, put in new stat, had coolant system flushed and rad rodded out. Still under WOT spews coolant out the overflow hose.
Problem #2 Dont know if the two are connected am loosing power, running rich on bank 2 (-9.2). Think truck is running rich on that side, then the computer is calling for it to lean out which gives very bad S/Knock and loss of power. Thought this was bad O2 scanner said the heater in O2 was not working so we replaced it. I am at my wits end.
???? . could there be a bad head gasket causing pressure in coolant under WOT and leaning it out under WOT? Would a vacuum leak cause this?
Last edited by blacktrk; Sep 20, 2004 at 09:44 PM.
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Joined: Mar 2004
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From: Fat Chance Hotel
Originally Posted by blacktrk
Ok
I need a bona fide guru!
I have a 99.5 5.3 Chevy Silverado with 34,000 miles. Truck sat for 3 years. I have now resurrected it. Have put 3 x-Pipe, new cats, K&N drop in, Taylor wires, Iridium plugs, Westers tune. Soon to get e-fans and Aem filter set up.
PROBLEM #1. when WOT the truck spews coolant out the overflow. Though it was a junk stat, put in new stat, had coolant system flushed and rad rodded out. Still under WOT spews coolant out the overflow hose.
Problem #2 Dont know if the two are connected am loosing power, running rich on bank 2 (-9.2). Think truck is running rich on that side, then the computer is calling for it to lean out which gives very bad S/Knock and loss of power. Thought this was bad O2 scanner said the heater in O2 was not working so we replaced it. I am at my wits end.
???? . could there be a bad head gasket causing pressure in coolant under WOT and leaning it out under WOT? Would a vacuum leak cause this?
I have a 99.5 5.3 Chevy Silverado with 34,000 miles. Truck sat for 3 years. I have now resurrected it. Have put 3 x-Pipe, new cats, K&N drop in, Taylor wires, Iridium plugs, Westers tune. Soon to get e-fans and Aem filter set up.
PROBLEM #1. when WOT the truck spews coolant out the overflow. Though it was a junk stat, put in new stat, had coolant system flushed and rad rodded out. Still under WOT spews coolant out the overflow hose.
Problem #2 Dont know if the two are connected am loosing power, running rich on bank 2 (-9.2). Think truck is running rich on that side, then the computer is calling for it to lean out which gives very bad S/Knock and loss of power. Thought this was bad O2 scanner said the heater in O2 was not working so we replaced it. I am at my wits end.
???? . could there be a bad head gasket causing pressure in coolant under WOT and leaning it out under WOT? Would a vacuum leak cause this?
Pressure in the coolant system is a dead ringer for a blown head gasket. What happens: combustion pressure bleeds into the coolant sytem, then forces coolant out the overflow. Start there. Worry about the second problem once you fix the first/bigger problem.
