Removing intake manifold

This is an ignition error. that could one of several things wrong. since it is noted in Bank 1 it is a problem with the right side of the engine Cylinders 1, 3 or 5. located under the intake manifold (close to the firewall)
Other causes:
1. Fouled plug (cylinders 1, 3 or 5)
2. Bad ignition Coil (cylinders 1, 3 or 5)
3. Wire fault to Coils (cylinders 1, 3 or 5)
4. Fault with the O2 sensors (Right side bank 1)

1. Start by checking /changing the plugs. You have to remove the intake manifold to get to plugs (cylinders 1, 3 or 5). if the mileage is high and they have not been changed, then its probably due.
2. Inspect the coil wires for cracks or faults.
3. Swapping the coils cylinders 2, 4 & 6 for cylinders 1, 3 & 5. if the fault changes to bank 2 then you have a bad coil on 2, 4 or 6.

What engine do you have in your Nissan that has the misfire, how many cylinders and how many liters???

Intake manifold gasket ,try torqueing intake bolts,or spray carb cleaner around bolts and seem while running see if it rums smoothly while spraying if so new intake manifold gaskets needed. YouTube video check to see.

Codes p1537 and p 1538 are codes for a faulty IMRC valve. They are located on the lower intake manifold.

Intake Manifold Runner Control (IMRC), Vacuum Control

1. Remove E-clip retaining vacuum control linkage to lever/shaft assembly.
   

1. Remove adjustment screw from the vacuum control (9S514) and bracket.
   

1. Remove two bolts retaining vacuum control and bracket to IMRC housing assembly.
   

1. Disconnect linkage from the lever/shaft assembly and remove vacuum control .
   

1. To install vacuum control and bracket assembly, reverse Removal procedure. Tighten retaining bolts to 8-11 Nm (71-97 lb-in). Adjust vacuum control as described.
   
   
   Intake Manifold Runner Control (IMRC)
   
   
   
   

As for the misfire codes, Check out the upper and lower intake gaskets. Since you have to take the upper intake off for the imrc valves its just a few more bolts to remove the lower intake. The intake gaskets are rubber seals. When the engine is cold the seals shrink and causes a misfire. when the engine warms up the seals expand and the misfire goes away.

I have an 2002 Escape with a 3.0L engine.
First you need to get a OBD2 scan for the check engine code.
I suspect the code will tell you that one of the cylinders is misfiring.
If you also have the V6 engine, the most common cause of misfire is one of the Coil-Over-Plugs (COP). Each cylinder has a COP on the spark plug.
On the V6, you need to remove the upper intake manifold to get the back 3 COPs.
If you have a V6, and you have cylinder misfire, I recommend replacing all the plugs and coils.

I have had 2 COPs go bad. The second time, I replaced all of them.

Removing the intake is fairly easy if you have some repair experience. You need to get an intake gasket set for about $10-15.
The coils run +$75 each for OEM. I went with Ebay aftermarket; 6 coils for about $80.
I recommend replacing the plugs with the exact same brand as original. There is no miracle plug that will give you better performance or mileage. Stay original.

Cylinder Head Removal & Installation SOHC To Remove:

1. Relieve fuel system pressure.
2. Remove timing belt cover. Camshaft timing marks
   
   
3. Turn crankshaft until timing mark on front housing and the arrow "2" on the camshaft pulley align.
4. Loosen lock bolt on tensioner.
5. Pry tensioner away from timing belt and tighten lock bolt to relieve tension on the timing belt.
6. Remove timing belt from camshaft pulley.
7. Disconnect battery negative cable.
8. Remove 3 bolts that secure accelerator cable and air intake hose to cylinder head cover.
9. Detach accelerator cable and place off to side.
10. Remove the following;
    • Air hose
    • Air ISC air hose
    • Breather hose
    • Vacuum hose from air intake hose
11. Disconnect mass air flow sensor electrical connector.
12. Remove air intake hose.
13. Remove PCV valve from cylinder head cover.
14. Remove ISC air hose from idle speed actuator.
15. Remove air hose from behind intake manifold.
16. Remove 2 screws from high tension wire protectors.
17. Detach wire loom from holder at rear of cylinder head cover.
18. Detach vacuum tube at rear of cylinder head cover.
19. Remove vacuum pipe. Cylinder Head Cover
    
    
20. Remove 7 cylinder head cover bolts.
21. Remove cylinder head cover and gasket.
22. Disconnect 2 ignition coil electrical connectors.
23. Disconnect 2 fuel injection electrical connectors at rear of cylinder head.
24. Disconnect the following electrical connectors;
    • Oxygen sensor
    • Throttle position sensor
    • Idle speed actuator
    • Oil pressure switch
    • EGR vacuum solenoid valve at intake manifold
25. Disconnect heater hose from elbow.
26. Disconnect brake booster vacuum hose and cruise control vacuum hose from surge tank.
27. Detach wire harness from rear of cylinder head.
28. Disconnect purge control solenoid vacuum hose from intake manifold.
29. Disconnect fuel hose from fuel connector assembly.
30. Remove grounding bracket.
31. Remove 4 bolts and intake manifold bracket.
32. Remove starter.
33. Detach water bypass hose from bypass pipe.
34. Disconnect water hoses from oil cooler.
35. Disconnect fuel hose from fuel pipe.
36. Remove exhaust manifold heat shield.
37. Remove exhaust flange nuts and front exhaust bracket bolt.
38. Lower exhaust system. Cylinder head bolt loosening sequence
    
    
39. Loosen cylinder head bolts in 3 steps in proper sequence.
40. Remove cylinder head bolts and washers.
41. Remove cylinder head, intake manifold and exhaust manifold as an assembly.

To Install:

1. Install NEW cylinder head gasket.
2. Install cylinder head, intake manifold and exhaust manifold as an assembly.
3. Tighten cylinder head bolts in 3 steps in reverse sequence that was used during removal. Tighten bolts to 62 ft lb (84 Nm).
4. Install front exhaust bracket bolt. Tighten bolt to 20 ft lb (27 Nm).
5. Install NEW lower exhaust flange gasket and 3 nuts. Tighten nuts to 24 ft lb (31 Nm).
6. Install exhaust manifold heat shield. Tighten nuts to 35 in lb (4 Nm).
7. Connect fuel hose to pipe.
8. Connect 2 hoses to oil cooler.
9. Attach water bypass hose to bypass pipe.
10. Install starter and bolts. Tighten bolts to 34 ft lb (46 Nm).
11. Install intake manifolds bracket and 4 bolts. Tighten bolts to 32 ft lb (45 Nm).
12. Install grounding bracket.
13. Connect fuel hose to fuel connector assembly.
14. Connect the following electrical connectors;
    • Oxygen sensor
    • Throttle position sensor
    • Idle speed actuator
    • Oil pressure switch
    • EGR vacuum solenoid valve at intake manifold
15. Connect purge control solenoid vacuum hose to intake manifold.
16. Attach wire harness from rear of cylinder head.
17. Connect brake booster vacuum hose and cruise control vacuum hose to surge tank.
18. Connect heater hose to elbow.
19. Connect 2 fuel injection electrical connectors at rear of cylinder head.
20. Connect 2 ignition coil electrical connectors.
21. Install cylinder head cover.
22. Install 7 cylinder head cover bolts. Tighten bolts to 60 in lb (7 Nm).
23. Install vacuum pipe and 2 bolts at rear of cylinder head cover. Tighten bolts to 60 in lb (7 Nm).
24. Connect vacuum tube to pipe.
25. Connect loom holder to rear of cylinder head cover.
26. Install 2 screws to high tension wire protectors.
27. Install air hose to behind intake manifold.
28. Install ISC air hose to idle speed actuator.
29. Install PCV valve to cylinder head cover.
30. Install air intake hose.
31. Connect mass air flow sensor electrical connector.
32. Install the following;
    • Air hose
    • Air ISC air hose
    • Breather hose
    • Vacuum hose from air intake hose
33. Attach accelerator cable.
34. Install 3 bolts that secure accelerator cable and air intake hose to cylinder head cover. Timing belt pulley timing marks
    
    NOTE: Timing belt pulley timing mark and timing mark must be aligned.
    Camshaft timing marks
    
    NOTE: The arrow at "2" on camshaft pulley must be aligned with timing mark on front housing.
    
35. Install timing belt.
36. Install timing belt cover.
37. Pressurize fuel system.
38. Start engine and check ignition timing.

Ford Escapes are known for having problems with their ignition coils. #4 if this is a 3.0l is under the intake manifold. So the manifold will have to be removed. While you are there check the spark plugs if they are good replace the coil on #4, but I would replace the plugs and all 3 coils while the intake is off. Good Luck

well the codes
p0300 multiple misfire
p0303 misfire cylinder 3
p0304 misfire cylinder 4
p0307 misfire cylinder 7

can be alot of things check cylinders for compression is what i would do first..

hey thanks for bringing me up to speed. ive been working on many other problems but with your great explanation i remember.
we need to check the compression on that cyl. and compare it to the compression on 2 other cylinders your choice.
but before you do this get a can of carb cleaner . and with the car idling spray around the intake manifold in the area of #6 cyl. what we are looking for is a small vacuum leak that would also act like this. with the engine idling and spraying around the intake the engines idle sould not change and if it does when you spray you have an intake leaking.
let me know how it turns out.
later
paul