86 LeBaron. We had the engine replaced. It smoked and had low gas milage. We had the oxygen sensor replaced. Stopped smoking and got better milage. Now its smoking and has low milage again. What should we replace next?

by the way. the vent in the car doesn't work. Air only comes out or the top of the dash. Could it be that when they replaced the engine, they didn't reconnect the vacuum hose? Would that also cause the above problem?

 

Did you come up with that on your own? Very good! Yes, there is a very good chance if buy chance the air conditioner and the map sensor share the same vacuum source. The A/C issue is most definately a vacuum issue. Defrost is the defaut setting in the absense of vacuum supply. The chances of the engine problem also being vacuum related are a lot less but possible. Other then telling you to look over the vacuum system very carefully, there's not much else we can tell you without a LOT more information,

 

Used or rebuilt engine? Either way, bring it back to the shop and have them fix it free.

Don't throw parts at the problem, you won't solve anything---and you'll put more into this than it could ever be worth (which you have unfortunately done already).

 

i can only imagine what it looks like under the hood, usually these vacuum lines are broken, repaired, broken again, and repaired again. sometimes they even break by looking at them, trying to fix one, usually breaks two more. now add a turbo's heat six inches under this whole mess and you can get a clear picture.

someone needs to put it back together the right way, with new lines and routed the correct way, assuming that's even the problem.

has the check engine light ever been on?

the vac supply for the interior stuff is usually right at the brake booster. start at the big fitting at the booster and follow the small hose into the firewall, it should go right above the heater hoses and out of sight.


let us know what you find

 

If that's a 4 cyl, they use a molded vacuum harness that lays against the valve cover very near the head and the heat destroys them. They get so hard an brittle that you can't touch them without breaking them. When replacing them it is hard to follow the original schematic and sometimes gets really screwed up. Get a vacuum schematic and compare it with what you have there.