My 89tbi is running super rich. I changed the cat the 02 sensor did a oil change changed my fuel pump and my gas tank (was rotting out on me) and I swapped my tranny (all syncros were shot) all this in the past 2 weeks. And now it's running super rich like it's burning my eyes and I went from about 12-14 mpg to about 5-6 which is killing my wallet. Any advise. And I found a weird 3 tubed vacuum line that I have no idea where it is suppose to go. Looks like all the lines run to the canister.
I don't thinks it's a manifold leak. I'll check tho. I noticed the bad gas Mileage after I Swaped my tranny. I'm wondering if I forgot to hook something up or if I broke a wire. I did find a conector that ran to my tranny that had 4 wires going to the conector and 4 coming out but only 2 go somewhere. The other 2 are just hanging there. And I also found a vacuum line that was hooked to anything on either side.
Well it's still running rich and I can't figure out why. I tried a new 02 sensor. Same problem. I'm getting exhaust in my cabin when I turn in off and out from under the hood. Could and exhaust leak cause the richness
I just had that problem and my siuation was that the vacuum line to the MAT sensor had disappeared- gone, vanished! Found a piece of 1/8" vac. hose and forced it on- problem solved. I hope this helps yours. With all the lines hangin' loose you've got, I'd suggest that you buy a Chilton's Manual and start replaceing/hooking up vacuum lines.
I've been throwed out of a carwash- too much mud!
I've done bodywork useing a winch, a tree, a prybar, and a BFH!
Now, my wild oats have turned to prune juice and all-bran...
Cibus suggested looking for an exhaust leak - the starting fluid spray is a check for an intake or vacuum leak. Toasted exhaust valves will also give you the same rich running condition, but will usually be combined with backfiring through the throttle body.
A leak in the exhaust system between the cylinder and the oxygen sensor will give you sensor readings equivalent to a lean condition - the ecu sees this and increases the fuel flow to compensate.
I would check on the fuel pressure and the vacuum connection to the regulator - no vacuum at the regulator will raise the fuel pressure by around 8 psi, giving rise to a mild rich condition if everything else is in good shape. I think you have a combination of things giving you this problem, but the fumes from the engine bay would give me cause to look at the exhaust manifold and exhaust pipe connections first. If there are noticeable fumes coming from the engine bay, there should be enough of a leak that you should be able to see, and even feel where the exhaust is coming from.
The exhaust leak in front of the O2 sensor makes it think its running lean. That is bad news because the computer will start dumping fuel. Its common to 1) crack the exhaust manifold especially near the collector tubes 2) loose/break the manifold bolts especially on rear near the firewall 3) burn or break the O2 sensor wire.
Well today I finally finished Playing with my jeep. I went for the simple ole swap the exhaust manifold. Haha yeah right was a pretty big job. I got a new manifold an gasket. The tear down took me maybe 2 hours. Well it took me about 12 hours putting it back together. First of all who ever designed those damn manifold bolt locations needs to be shot. I had such a hard time getting all of the bolts to thread. I ended up cutting the egr tube off and making a block of plate so I could install the exhaust manifold first. Well once I did that it went a little bit smoother. Until I finished up and it would start. I couldn't figure out what I did. Turns out I so how disconnected my starter relay. Well I did all of that and replaced the 02sensor. And it's still running rich. I did have a crack In my manifold. Oh and FYI that colored engine paint. Does not hold up on the exhaust manifold. Haha figured that while it was off I might as well make it look nice.