Think this should clear all exhaust problems up bit long winded but you get my DRIFT
In this post carb also includes throttle body ie were the air goes in ha ha
Gray or blue smoke from the exhaust. You notice gray smoke coming from the exhaust when you start your car. The smoke may or may not disappear after the car is warmed. If it is, it is less noticeable. The smoke may have a bluish tint to it.
Possible causes:
1.The engine's piston rings may be worn.
The Fix: Replace piston rings. (Generally not a DIY job)
2.The engine's valve seals may be worn.
The Fix: Replace valve seals. (Generally not a DIY job)
3.Damaged or worn valve guides.
The Fix: Replace valve guides. (Not a DIY job)
Symptom: Engine uses more oil than normal, and there is some smoke from the exhaust. The oil level is low between oil changes. It appears that the oil is being burned by the engine because of the smoke in the exhaust. You may or may not notice the engine doesn't have the same power as it used to.
Possible causes:
The Fix: Check compression to determine engine condition.
3.The engine's piston rings may be worn.
The Fix: Replace piston rings. (Generally not a DIY job)
4.The engine's valve seals may be worn.
The Fix: Replace valve seals. (Generally not a DIY job)
White smoke or water vapor from the exhaust. You notice white smoke coming from the exhaust when you start your car. If it is cold out, this may be normal. If the smoke does not disappear after the car is warmed, you have a problem.
Possible causes:
1.Transmission fluid may be entering the intake manifold through a breather pipe doesn`t apply to EP 82 or EP 91 as it is fed to athmosphere
The Fix: Replace vacuum modulator
2.Cylinder head gasket(s) may be bad.
The Fix: Replace cylinder head gasket(s).
3.Cylinder head(s) may be warped or cracked.
The Fix: There isn`t one ha ha
Black smoke from the exhaust. You notice black smoke coming from the exhaust when you start your car. The smoke may or may not disappear after the car is warmed. If it is, it is less noticeable. Engine may or may not be running rough or misfiring.
Black smoke is a sure sign of unburned fuel.
Possible causes:
1.If you have a carburetor, the carburetor choke may be stuck closed.
The Fix: Repair or replace choke.
2.Fuel injectors may be leaking.
The Fix: Replace fuel injectors.
3.You may have a dirty air filter: Replace the air filter.
4.There may be some other type of ignition problem.
The Fix: Check distributor cap and rotor. Ignition module may be bad.
5.Check plugs for fowling gapping and detonation problems.
Fuel Odour or Drop in mpg
The car uses more fuel than normal, and there is a strong odor from the exhaust. You notice that gas milage has gone down quite a bit. There is a strong smell like rotten eggs coming from the exhaust. You may or may not have noticed that the car doesn't have the same amount of power it used to.
Possible causes:
1.If you have a carburetor (seriously?), the carburetor choke may be stuck closed.
The Fix: Repair or replace choke.
2.The engine may have mechanical problems.
The Fix: Check compression to determine engine condition.
3.The ignition timing may be set wrong.
The Fix: Adjust ignition timing.
4.There may be a fault in the computerized engine control system:.
The Fix:Check engine control systems with a scan tool. Test circuits and repair or replace components as required. (Generally not a DIY job)
5.The engine may be running too hot.
The Fix: Check and repair cooling system.
6.The fuel injectors may be stuck partially open.
The Fix: Replace injectors.
7.There may be an emission-control device that is not working properly.
8.There may be some type of ignition problem.
The Fix: Check and replace distributor cap, rotor, ignition wires and spark plugs.
9.The fuel pressure regulator may be operating at too high of a pressure.
The Fix: Check fuel pressure with a fuel pressure gauge. Replace fuel pressure regulator. (Generally not a DIY job)