Pbeanbag
Newbie
Hi guys, just thought I would post a follow up after the whole ECM issue. The wire coming from the tranny was the problem. Since i repaired it, all good! woo hoo! however i thought i would share an intereting issue and repair.
I had a coolant issue ....when i would start the truck(after topping off the radiator every day) it would build up air like a head gasket problem but all checked out. after i purged the air it ran fine but wouls still leak.Especially after shut down. I know a little about pumps from work and know that any pump will suck air before fluid ,so with that in mind i deducted that the pump had a bad backing plate gasket. Asked many top mechanics in my area all said "never heard of such a thing" well, I was right.
so this is how it worked....at start up the pump immeadiately sucked air into the cooling system but as the pressure built up it stopped sucking and only leaked when pressure built up considerably. Then when shut down the pressure would push the excess coolant out running from up behind the hose. New pump, problem solved !
Just keep this in mind cuz these old trucks will drive you crazy with puzzling isues.
Thank you everyone for all your help.
I had a coolant issue ....when i would start the truck(after topping off the radiator every day) it would build up air like a head gasket problem but all checked out. after i purged the air it ran fine but wouls still leak.Especially after shut down. I know a little about pumps from work and know that any pump will suck air before fluid ,so with that in mind i deducted that the pump had a bad backing plate gasket. Asked many top mechanics in my area all said "never heard of such a thing" well, I was right.
so this is how it worked....at start up the pump immeadiately sucked air into the cooling system but as the pressure built up it stopped sucking and only leaked when pressure built up considerably. Then when shut down the pressure would push the excess coolant out running from up behind the hose. New pump, problem solved !
Just keep this in mind cuz these old trucks will drive you crazy with puzzling isues.
Thank you everyone for all your help.