Setting timming changed headgaskets timing marks up top set but bottom timming mark keeps movihg 15 deg btdc even know start at 5 deg rottor button set on number one but does not start . sounds like it is still out .have i set timming w rong

Probably, but it is all done electronically by the ECM and the Crankshaft Position Sensor. The days of timing lights and marks are long gone.

https://www.google.com/search?q=04+Nissan+Quest+3.5+setting+ignition+timing

...

How do you know the timing needs to be set? Check library for a repair manual. Usually the timing marks are marked on the front balancer pully mark the designated mark with something like whiteout so you can see it properly with a timing light.

No, you don't need to remove the pully.

Here's how you set the timing:

You will need a timing light and a 1/2 inch or 13mm wrench.

1. Take a rag and clean the timing marks on the pulley and the timing cover. If you have any white out type correction fluid, you can also paint the marks white, to make them easier to see.

2. Start the engine and run until it is warm... about 5 minutes (the upper radiator hose will be warm).

3. Shut off the engine and find the timing connector, a grey plastic plug in the wiring harness near the distributor. Unplug the timing connector.

4. Loosen (but do not remove) the nut holding the distributor to the engine.

5. Connect your timing light. The magnetic pickup goes on the number 1 plug wire (number one is the front cylinder in your engine) and the other two leads connect to the battery, red on positive, black on negative.

6. Start the engine and point the timing light at the timing marks on the timing cover. You should be able to see the mark on the pulley as well. Gently rotate the distributor until the timing mark on the pully aligns with the 10 degree BTDC (before top dead center) mark. You might want to scribe a mark on your distributor before you start so that if you accidentally move the distributor too far and the engine dies, you can put it back where it was in order to restart the engine.

Once you have the timing set to 10 deg BTDC, shut the engine off, retighten the distributor nut and reconnect the timing connector.

Hello leahlogan201: My name is Roger and I will help you. There are three different settings for this year car. setting #1 - Manual transmission 49 states and high altitude 24 deg BTDC at 800 +/- 50 rpm. #2- California emissions 20 deg BTDC at 800 +/- 50 rpm. #3 Automatic transmission 15 deg BTDC at 750 +/- 50 rpm in D range.
Should you need further help please just ask. Please rate the answer. THank You for using Fix Ya. Roger Note: That BTDC stands for Before Top Dead Center

Hello bojak80,

The basic timing is 5 deg. BTDC. Below is a picture of the timing mark. I hope this helps you.



Regards,
netvan

Your auto's spec sheet should tell you what your timing degree should be. For example, a 1969 Ford 429, 6 Degrees BTDC @ 550 rpm in drive gear - with automatic trans, with a firing order of 1-5-4-2-6-3-7-8. All this means is that you want to line up the pointer on the timing light with the 6° timing mark when the engine is idling in gear at 550 rpm. As you can see, it also says something about "BTDC" for this Ford. There is also an "ATDC." "Before Top Dead Center" and "After Top Dead Center" - top dead center is the point where the piston reaches the highest point in the cylinder and that is when the compression is the greatest. Now, your timing marks with have a line labeled "0" with marks above and below it, and depending on which way the wheel rotates, you will see the lines before the "0" (BTDC), or after the "0" (ATDC)

The firing order is 1-5-4-8-6-3-7-2, distributor turns counter-clockwise. The ignition timing can be set using marks on the vibration damper. The wide mark is TDC (Top Dead Center), each mark after the wide mark represents 2, 4, 6, 8 and 10 degrees before TDC. Set timing 3 degrees BTDC (Before Top Dead Center). In addition, valve timingis set like this: Intake opens: 12 degrees BTDC
Exhaust Closes: 8 degrees ATDC

Look on the pointer to see if it is there.

you only set base timing to 15 degrees BTDC (before top dead center).

Ignition Timing

1. CAUTION: Parking brake control should be applied.
   Depress the parking brake pedal, and warm the engine to the normal operating temperature.

1. Turn off all electrical loads.

1. Rev the engine to 2000-3000 rpm two or three times and allow the engine to return to the idle.

1. Turn off the engine and disconnect the throttle position sensor electrical connector. (not really necessary)

1. Start the engine and rev it to 2000-3000 rpm two or three times and allow the engine to return to the idle.

1. Check the idle speed. The idle speed should be between 700-800 rpm in PARK (P) or NEUTRAL (N) position.

1. NOTE: Make sure that the timing pointer is pointing to the 15° Before Top Dead Center (BTDC) mark on the crankshaft pulley. Each notch on the crankshaft pulley represents 5 degrees.
   Check the ignition timing with a timing light.

go here for villager help

http://autos.groups.yahoo.com/group/villagerquest/

it is possible.