Ignition Timing (Problem?)
#1
Registered User
Thread Starter
Ignition Timing (Problem?)
Is the ignition supposed to stay exactly at the 10* BTDC mark (3VZ-E) or will it fluctuate plus or minus 2 degrees? I was trying to get it to stay with the terminals jumped, but it would jump to an occasional 12* or 8* and then up to 15*. Does this indicate a bad distributor housing or something else? Ignitor? The plugs, wires, distributor cap and rotor are only about 15K miles old. I also have a pinging problem (when running premium gas), which i guess is related to the timing jumping way to 15* BTDC. Any input is greatly appreciated!!
#2
Contributing Member
ignition timing mark (harmonic balancer)
I also don't see a 'perfect' stability on the 12*mark where I have set it...it sometimes jumps around a little...but I ignore the occasional spikes and focus on the main mark where it spends the vast amount of time as the actual setting. It's not an exact science, you should be able to interpret what your timing light's telling you...I'm subscribing to this thread, curious about whether other 3vze engines are giving a rock solid timing light reading or oscillating a bit like mine.
#4
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Thread Starter
Well, I just cleaned out the Throttle Body this weekend, and all of the TPS readings are within spec. I have a couple of friends that have gen 2 4Runners with the 3.0. One of them has a rebuilt engine. I'll put my timing light on his 3.0 and see what I get.
#5
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I finally got around to comparing timing readings. The ignition timing jumps around a little bit on my friends rebuilt rig too. I dropped the idle speed to 400rpm on my rig and the flash became steadier at the 10 degree mark. I think the fact that my timing light was made in the 70's and it is pretty old might have something to do with it too.
#6
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Join Date: Nov 2006
Location: Tinley Park, IL
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Timing jumps around. Nothing to worry about. Unless it is running like complete crap. Timing gun has nothing to do with it. Just jumper the pins. set the timing and you are good.
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#8
Registered User
It's a mechanical system, subject to "jitters" as teeth engage and the distributor gets turned.. Crank trigger systems are much more accurate.
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