While car is running gas smell comming from mufflers
I have a 84 buick regal with a 350 chevy motor ,i have duel pipes out the back.while car is running standing on out side of car i smell gas it smells like it is comming out the tail pipe.i put a new mufflers flowmasters on and it is doing the same thing
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If you have a duel exhaust from front to back and 1 side is cool then there is a block in that side and the motor on that bank can not breath causing the rough running condition. Clogged Cat or muffler would be my guess or a rodent got in and got stuck.
check your exhaust piping for any sensors that may have been damaged or unplugged during your manifold gasket job. Usually you can find them between the motor and the muffler, as well as between muffler and back of car.
it might be the sending unit, is it a buick 350 or a chevy. 350? if a buick engine the sinding unit should be on the side of the timing cover if a chevy 350 next to the dist.
remove the oil sinding unit and install a manuel gauge and see just what the oil pressure is if below 10 psi at hot idle replace the bearings and oil pump in the engine. if this is a chevy 350 make sure you replace the camshaft bearings this is were we use to see the gratest oil pressure loss.
Depends on which 3.8 you have because there were two avaliable in that car .One was the buick 231 cubic in and the distributor was on the fron of the engine.The other was the chevy 229 cubic inch engine and the distibutor was in the back just like on the small block v8.If you have the buick motor be prepared to swap everything including wiring harness and transmission.If you have the chevy v6 it not so bad but you will really need a donor car(monte carlo,cutlas,lemans)with a 305 or 350 for the wiring harness ,radiator shroud ( shorter on the v8) ,a/c lines (longer on the v8).Years ago I had a lemans wagon with the chevy 3.8 that i put a Monte Carlo ss motor in and it looked like it came with it.bought a wrecked mc( hit in the rear) and swapped everything.Including coil springs and sway bars front and rear.And yes the SS 15 inch wheels too! It was a real cool sleeper.Miss that car.
Sounds like you might have an oxygen sensor problem. Your catalytic converter(s) maybe defective or dirty. That in turn can dirty up the oxygen sensor. A defective oxygen sensor will send faulty info to the computer, interpreting the fumes as cold (even when the engine warms up). That causes the computer to adjust the fuel mixture to very rich, giving you poor gas mileage and the fuel smell. Hope it helps.
There is a tube on the drivers side of the carb. facing the front of the engine. It only draws vacuum when you are giving it the gas. Is it a quadrajet? Get one from a 1970-1974 these are simple to operate.
I swapped mine out and put in a 350 with a turbo 350. The rear end is not posi but if that's not a problem the drive shaft will work but you'll have to get a new trans mount. you can get one from Summit or jegs. Also the motor mounts will have to be moverd to the furthest front position. Best to put the mounts in then try the engine for fit before you bolt in the trans. You'll also have to rerun the fuel line to the other side. There are some other minor mods but you do them as you go along.