Hi again guys. I hope your holidays are going (or went) well.
You may recall that I have a 1986 Chevy half-ton with a 305. It has always seemed like a real dog, but lately it has gotten a lot worse, practically overnight. I have already done the tune-up, carb overhaul, etc. etc. and all that stuff still checks good.
So I pulled the exhaust pipe off the left manifold and -- HOLY COW! It's no speed demon, but at least it will get on the highway comfortably. It drives like a different truck.
I took it to a muffler shop, and the guy told me that somebody in the past put on the wrong type of converter. It is supposed to have a "backpressure EGR" converter, and they put on a "regular" converter. To make matters worse, he claims that the emmission controls are now damaged by the wrong converter (not enough backpressure at first, and now too much backpressure due to the fouled converter). It had something to do with a check valve on the A.I.R. system. According to him, the fouled converter also explains why I had to unhook the EGR and A.I.R. stuff to get the engine to idle.
Well, according to the muffler guy, if he puts on a new converter (it doesn't seem to matter if it's the "right" converter or not), it will just get "burned up" by the emmission control system problems.
Does any of this make sense to you guys? Is it all consistent?
Thanks.
Wayne.
You may recall that I have a 1986 Chevy half-ton with a 305. It has always seemed like a real dog, but lately it has gotten a lot worse, practically overnight. I have already done the tune-up, carb overhaul, etc. etc. and all that stuff still checks good.
So I pulled the exhaust pipe off the left manifold and -- HOLY COW! It's no speed demon, but at least it will get on the highway comfortably. It drives like a different truck.
I took it to a muffler shop, and the guy told me that somebody in the past put on the wrong type of converter. It is supposed to have a "backpressure EGR" converter, and they put on a "regular" converter. To make matters worse, he claims that the emmission controls are now damaged by the wrong converter (not enough backpressure at first, and now too much backpressure due to the fouled converter). It had something to do with a check valve on the A.I.R. system. According to him, the fouled converter also explains why I had to unhook the EGR and A.I.R. stuff to get the engine to idle.
Well, according to the muffler guy, if he puts on a new converter (it doesn't seem to matter if it's the "right" converter or not), it will just get "burned up" by the emmission control system problems.
Does any of this make sense to you guys? Is it all consistent?
Thanks.
Wayne.