Fuel and exhaust system cleaner - 1996 Mercury Grand Marquis

HI,

This depend on where you are in the world and which system your using.

theres 2 types. 1 - bottle to be added to the fuel as an additive
2 - is by a workshop, they disconnect your fuel and use a special cleaner fuel mix. which cleans everything from the fuel rail to the exhaust.

use redex or shell performance fuel (if possible) as there the only one proven to work in the real world.

if not available look for a good quality fuel cleaner over a performance additive.

No such thing. Are you confusing the catalytic converter in the exhaust with the evaporative emissions system that routs fuel tank vapors to a charcoal canister and then into the engine to be burned?

The catalytic converter just takes the exhaust gas through it, and by a chemical reaction with the rare metals in the converter acting as a catalyst, it burns most of the remaining hydrocarbons (unburnt fuel) in the exhaust for a cleaner, less polluting exhaust.

What did you do with the exhaust system? Back pressure on the exhaust can effect the fuel economy.

black means too much fuel run some fuel injector cleaner through to help clean up fuel delivery system-do you have a check engine light on -Denny

The 3.1 engine does not have a belt,it is a chain motor.You do not need to remove timing chain to remove head.

Basically this means that an oxygen sensor in bank 1 detected a lean condition (too much oxygen in the exhaust). On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1. Try cleaning your MAF sensor (Mass Air Flow) and run a good fuel system cleaner through it.

The bolts should have thread lock on them when installing, and the torque is done in 2 steps. 33 ft lbs. and then 90 deg. after that on the second pass. 3.1L Engine CAUTION
Observe all applicable safety precautions when working around fuel. Whenever servicing the fuel system, always work in a well ventilated area. Do not allow fuel spray or vapors to come in contact with a spark or open flame. Keep a dry chemical fire extinguisher near the work area. Always keep fuel in a container specifically designed for fuel storage; also, always properly seal fuel containers to avoid the possibility of fire or explosion. LEFT SIDE (FRONT)

1. Properly relieve the fuel system pressure.
2. Disconnect the negative battery cable.
3. Drain the cooling system into a suitable container.
4. Disconnect the top half of the air cleaner assembly, then remove the throttle body air inlet duct.
5. Remove the exhaust crossover pipe heat shield and crossover pipe.
6. Disconnect the spark plug wires from spark plugs and looms then route the wires out of the way.
7. Remove the rocker arm (valve) covers.
8. Remove upper intake plenum and lower intake manifold.
9. Remove the left side exhaust manifold.
10. Remove oil level indicator tube. NOTE: When removing the valve train components they must be kept in order for installation in the same locations they were removed from.
    
11. Remove rocker arms nut, rocker arms, balls and pushrods.
12. Unfasten the cylinder head bolts evenly, then remove the cylinder head from the engine compartment. Remove and discard the gasket. To install:
    
13. Clean all the gasket surfaces completely. Clean the threads on the cylinder head bolts and block threads.
14. Place the cylinder head gasket in position over the dowel pins on the cylinder block so the words THIS SIDE UP are showing.
15. Coat the bolt threads lightly with sealer, then install finger-tight.
16. Tighten the cylinder head bolts in sequence to 33 ft. lbs. (45 Nm). With all the bolts tightened make a second pass tightening all the bolts an additional 90°.
17. Install the pushrods, rocker arms, balls and rocker arm nuts in their proper locations. Tighten the rocker arm nuts to 18 ft. lbs. (25 Nm).
18. Install the lower intake manifold and upper intake plenum.
19. Install the rocker arm (valve) covers.
20. Install the oil level indicator tube. Insert the dipstick.
21. Connect the spark plug wires to spark plugs and looms.
22. Install the left side exhaust manifold.
23. Install the exhaust crossover pipe and heat shield.
24. Refill the cooling system.
25. Install the top half of the air cleaner assembly and the throttle body air inlet duct.
26. Connect negative battery cable.
27. Start vehicle and verify that there are no leaks. Fig. 20: Cylinder head mounting and bolt tightening sequence - 3.1L engine
    

RIGHT CYLINDER HEAD (REAR) CAUTION
Fuel Injection systems remain under pressure, even after the engine has been turned OFF. The fuel system pressure must be relieved before disconnecting any fuel lines. Failure to do so may result in fire and/or personal injury.

1. Relieve the fuel system pressure.
2. Disconnect the negative battery cable.
3. Drain the cooling system.
4. Remove the top half of the air cleaner assembly and remove the throttle body air inlet duct.
5. Remove the exhaust crossover pipe heat shield and crossover pipe.
6. Raise and safely support the vehicle.
7. Detach the Oxygen (O2) sensor connector.
8. Disconnect the exhaust pipe from the exhaust manifold.
9. Remove the right side exhaust manifold.
10. Carefully lower the vehicle.
11. Disconnect the spark plug wires from spark plugs and wire looms and route the wires out of the way.
12. Remove the rocker arm (valve) covers.
13. Remove upper intake plenum and lower intake manifold. NOTE: When removing the valve train components they must be kept in order for installation in the same locations they were removed from.
    
14. Remove rocker arms nut, rocker arms, balls and pushrods.
15. Unfasten the cylinder head bolts evenly, then remove the cylinder head from the engine compartment. Remove and discard the gasket. To Install:
    
16. Clean all the gasket surfaces completely. Clean the threads on the cylinder head bolts and block threads.
17. Place the cylinder head gasket in position over the dowel pins on the cylinder block so the words THIS SIDE UP showing.
18. Coat the bolt threads lightly with sealer, then install finger-tight.
19. Tighten the cylinder head bolts in sequence to 33 ft. lbs. (45 Nm). With all the bolts tightened make a second pass tightening all the bolts an additional 90°.
20. Install the pushrods loosely retained with the rocker arm assemblies. Make sure all pushrods are in the correct locations. Coat the ends of the pushrods with prelube. The intake rods are marked yellow and are 5 3?4 inch long. The exhaust pushrods are marked green and 6 inches long. balls and rocker arm nuts. Tighten the rocker arm nuts to 18 ft. lbs. (25 Nm).
21. Install the lower intake manifold and upper intake plenum.
22. Install the rocker arm (valve) covers.
23. Connect the spark plug wires to spark plugs and wire looms.
24. Raise and safely support the vehicle.
25. Install the exhaust manifold.
26. Connect the exhaust pipe to the exhaust manifold.
27. Carefully lower the vehicle.
28. Connect the Oxygen (O2) sensor wiring.
29. Install the exhaust crossover pipe and heat shield.
30. Refill the cooling system.
31. Install the top half of the air cleaner assembly and the throttle body air inlet duct.
32. Connect negative battery cable.
33. Start vehicle and verify that there are no leaks.

P0171 is the code for "Fuel System Too Lean." Which means that there is too much air (and too little fuel) in the combustion chamber.

There are quite a few things that could cause this code:
- Faulty fuel delivery system (fuel pump)
- Clogged fuel injectors ($3 fuel injector cleaner might clear it up)
- Faulty fuel injectors
- Leak in intake or exhaust system
- Faulty Mass Air Flow Sensor
- Faulty Throttle Position Sensor

Check that your Exhaust Gas Recycling Valve (EGR) is not stuck or plugged. A percentage of exhaust gas is recycled through your intake manifold. If the 10 percent,15 percent, 20 percent, etc.exhaust gas is not sent through the intake manifold it has to be replaced with fuel /air mixture. Using more fuel/air instead of spent gas lowers your fuel economy. Other things, try using fuel system cleaner in your gas, make sure your air cleaner is not dirty or plugged, new plugs can make for smooth running, bad distributor cap, bad wires , etc.

Basically this means that an oxygen sensor in banks 1 and 2 detected a rich condition (too little oxygen in the exhaust).

A code P0172 may mean that one or more of the following has happened:
· The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filters can cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry.
· There could be a vacuum leak
· There could be a fuel pressure or delivery problem
Possible solutions include:

• Inspect all vacuum and PCV hoses, replace if necessary
• Clean the MAF sensor. Consult your service manual for its location if you need help. I find it's best to take it off and spray it with electronics cleaner or brake cleaner
  Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling
• Inspect fuel lines for cracks, leaks, or pinches
• Check the fuel pressure at the fuel rail
• Check the fuel injectors, they may be dirty. Use fuel injector cleaner or get them professionally cleaned/replaced.
• Check for an exhaust leak before the first oxygen sensor (this is unlikely to cause the problem, but it is possible)