Help w/ Setting Timing - Nissan Frontier Forum
 
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post #1 of 8 (permalink) Old 08-18-2008, 11:50 PM Thread Starter
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Help w/ Setting Timing

What is the correct procedure to set timing on a 2001 VG33ER?

I've done this once before, it was something like unplug TPS, hold RPM at 2000 for 2 minutes, jump up and down twice while holding left hand in air... Honestly I don't remember the procedure, but I believe it had to be followed to set base timing correctly.

I've got my knock sensor bypassed, and I'm noticing a hint of preignition in lower RPM, high boost conditions (2600rpm or so). Last time I set the base timing, I put it right around -13.5 degrees BTDC to account for Colorado elevation.

Now that I'm close to sea level, I believe I need the correct -10 degrees BTDC (+/- 2 degrees). Perhaps someone with a factory service manual (or familiar with this procedure) could help me out some. Many thanks in advance.

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post #2 of 8 (permalink) Old 08-19-2008, 12:46 AM
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I'm 99% sure you let the engine warm up to operating temp then undo the tps sensor and hold the vehicle at 2k rpm to set timing

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post #3 of 8 (permalink) Old 08-19-2008, 08:50 AM
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Could someone be 100% positive on how to set the timing I would like to know also since I did the knock sensor mod too.



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post #4 of 8 (permalink) Old 08-19-2008, 11:37 PM Thread Starter
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Originally Posted by mudpunisher View Post
I'm 99% sure you let the engine warm up to operating temp then undo the tps sensor and hold the vehicle at 2k rpm to set timing
Nope, it had to do with holding the RPM at 2k for a period of time, then revving past 3k (?), and back to idle, at which you set the timing. I don't remember exactly but it was something along these lines.

I remember trying to set timing without following the correct procedure as outlined in the factory service manual, and it was impossible as the ECU is constantly adjusting timing when not in base timing mode.

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post #5 of 8 (permalink) Old 08-21-2008, 08:31 AM
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Here it is:

2. CHECK IGNITION TIMING

1. Run engine at about 2,000 rpm for about 2 minutes under no-load.
2. Rev engine (2,000 to 3,000 rpm) two or three times under noload,
then run engine at idle speed.
3. Turn off engine and disconnect throttle position sensor harness
connector.
4. Start and rev engine (2,000 to 3,000 rpm) two or three times
under no-load, then run at idle speed.
5. Check ignition timing with a timing light.

OK or NG
OK >> GO TO 4.
NG >> GO TO 3.


3. ADJUST IGNITION TIMING
1. Adjust ignition timing by turning distributor after loosening securing bolts.
2. Turn off engine and connect throttle position sensor harness
connector to throttle position sensor.
>> GO TO 2.

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post #6 of 8 (permalink) Old 08-23-2008, 06:24 PM Thread Starter
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Thanks, it worked beautifully.

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post #7 of 8 (permalink) Old 08-23-2008, 10:36 PM
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2001frontiersc

Can you tell me what you did to set your timing? Did you see a different? What was the timing to begin with and what did you have to do change it exactly?

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post #8 of 8 (permalink) Old 08-23-2008, 11:05 PM Thread Starter
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Originally Posted by joefrontier2 View Post
2001frontiersc
Can you tell me what you did to set your timing? Did you see a different? What was the timing to begin with and what did you have to do change it exactly?
I changed the factory timing from the normal -10 BTDC to -13.5 BTDC originally while living in Colorado, as the thinner air at higher elevation permits a bit more advancement on the timing. The advanced timing can help maximize fuel economy, increase power, and ensure fuel is ignited most efficiently.

Now that I'm back to sea level and after having done the knock sensor bypass, it's imperative to have correct timing because the engine has no way of detecting spark knock, which occurs when the timing is too far advanced. What happens is the spark plug ignites the fuel/air mixture while the piston is still traveling upwards. Very bad things can happen, like holes in pistons.

You can hear the spark knock as a harsh "rattling sound" under heavy throttle, usually at lower RPMs. I was hearing this at times, so I changed the timing to 9 degrees BTDC which is within the factory spec of 10 BTDC +/- 2 degees. It fixed the problem as there is no more pinging.

You just undo the bolt near the distributor cap. After having performed the procedure above (letting the engine warm up, revving it and such), you first shine your timing light down at the arrow that points to the crankshaft pulley. In the crankshaft pulley itself are five notches indicating from left to right 0 - 5 - 10 - 15 - 20. They are not labeled, but the center notch is correct value. The timing light will only light up when the spark plug fires, and it's so quick that it will show you exactly where on those indicators that the spark plug is firing. Then just turn the distributor either clockwise or counterclockwise to change the timing while looking at the notches w/ the light to see what the changes are doing. Find your desired setting, then screw the bolt back down. And you're done.

Hope this helps.

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