i'm currently driving a 95 dodge dakota.
2 weeks ago the plastic part of the EGR valve desinigrated (sp?) i put a new one on and all was well.
today driving, i hear a hissing sound that gets louder with more load on the engine. i bypass the EGR valve and the hissing continues.
the car has NO POWER. it sounds like a vac leak, but i cannot find it.

i'm guessing that whatever the leak is, is causing the exh temps to get REALLY hot and destroy the EGR valve. i also used a LOT (WAAY more than usual) of gas on today's trip, which goes along with the theory of the timing retard, super hot exh temps, melting the plastic of the egr valve.

the hiss is only when there is a load present.
i can hear it coming from the engine bay while in the car, but not when my head is over the motor.....

my daughter just went down for a nap so i can't sit in the driveway and rev the motor right now, so i decided to post to see about possible solutions like where to look, etc.
thanks folks

ps... this isnt my car so i can't just bypass the EGR permanently.

 

it might help my egr valve did the same thing because the cat was clogged and sending gas back to the egr and it go to hot and melted the egr and the o ring the goes in to the manifold and it did that same hissing noise also check both lines on the egr my exhaust kept blowing off and hissing sry to here about the egr problem i hated mine hope this helped a little bit

 

idk, when i hear the hissing, the truck will basically barely maintain speed. accelerating is out of the question

 

yea its the exhaust hose cause mind did that and i couldent get above 35 and that took forever i think you should replace it and check the exhaust hoses and check ur o2 and cat for carbon build up

 

i just got under the truck today, cat conv is fubar. its been rattling (didn't know THAT was the rattle) its hissing like a sumbitch.
looks like i get to spring a new repair on the inlaws

thanks for the inpu daslo1

 

no problem hope it all works out gl