Dizzy Timing

[DBMaster]

Here is my two cents, for what it's worth. My timing tab has a white paint mark and a red paint mark. I line up the pointer with the white mark with the vac lines disconnected and clamped shut. Then, when I reconnect them I make sure that the pointer lines up with the red mark. PERIOD, THAT'S IT. The white mark lines up with TDC and the red mark is 15 degrees BTDC. I do know that there are different timing specs for California cars.

When I have done the timing belt I followed my own rules. I rotate the engine by hand to line up the cam gear at TDC ("UP" stamp pointing straight up). Then, when the belt is off I line up the crank so the timing pointing is dead on the "T" mark, or the white paint mark on my engine. Then, when the new belt goes on everything is peachy.

[marvis]

This is really stating to piss me off..

I have done my idle correctly, car is warm, Vac connected and it's nowhere near the ~15* mark, I can see TDC but I will need to rev it to see the timing marks..

This is on an A20A4 converted to manual.

WTF?

[cygnus x-1]

This is really stating to piss me off..

I have done my idle correctly, car is warm, Vac connected and it's nowhere near the ~15* mark, I can see TDC but I will need to rev it to see the timing marks..

This is on an A20A4 converted to manual.

WTF?

Does the TDC mark move when the vacuum advance is connected or disconnected? If not then the vacuum advance diaphragm is toast. The timing belt could also be off a tooth. Set the crank at TDC and make sure the cam pulley lines up as follows.





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[marvis]

I will need to check to see if it does move, I just replaced my vac advance as it broke off.. Pretty sure it does.

I did the timing belt on it recently, It was previously out a tooth, but now won't rev over 5k.. Where it would sit on limiter all day before..

[kentwat]

Here is my two cents, for what it's worth. My timing tab has a white paint mark and a red paint mark. I line up the pointer with the white mark with the vac lines disconnected and clamped shut. Then, when I reconnect them I make sure that the pointer lines up with the red mark. PERIOD, THAT'S IT. The white mark lines up with TDC and the red mark is 15 degrees BTDC. I do know that there are different timing specs for California cars.

When I have done the timing belt I followed my own rules. I rotate the engine by hand to line up the cam gear at TDC ("UP" stamp pointing straight up). Then, when the belt is off I line up the crank so the timing pointing is dead on the "T" mark, or the white paint mark on my engine. Then, when the new belt goes on everything is peachy.

This is how I did mine. Mine has the factory flywheel so I know the marks are correct. Mine is fuel injected.

Marvis how did it run after you changed the belt? Because you say you changed the belt and vacuum advance. Just needing more info to try and isolate problem. Do you have the factory flywheel? Just searching for info. Also did you verify the 2 vacuum lines aren't swapped?

[marvis]

I checked the vacuum lines, they are correct. It ran better after the belt swap, but wouldn't rev over 4.5/5k. Nothing changed when I swapped vacuum advance.

It's a stock flywheel.

[cygnus x-1]

I checked the vacuum lines, they are correct.

OK.

It ran better after the belt swap, but wouldn't rev over 4.5/5k.

That indicates something is not right.

Nothing changed when I swapped vacuum advance.

Ok, so you put on a new diaphragm and it's the same. Therefore something else is wrong.

Did you check to make sure the timing belt is aligned properly? I know you said you replaced it already but you need to check again to make sure it's right. It's very easy to install it 1 tooth off. It happens all the time and produces symptoms very much like what you're describing.

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[marvis]

I made sure it was on correctly, but I will check again.

I have a carb flywheel on an EFI engine, would this pose a problem?

Thanks,

[cygnus x-1]

I made sure it was on correctly, but I will check again.

I have a carb flywheel on an EFI engine, would this pose a problem?

Thanks,

Nope, you just need to adjust the timing with the vac advance disconnected. Line it up to the white mark on the flywheel. Then when you re-connect the vac advance the timing will advance. You will probably see the red mark but it won't line up exactly because the carb engines use a little more timing advance, and have the red mark in a different spot.


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[marvis]

Isn't the white mark TDC?

Thanks,

[cygnus x-1]

Isn't the white mark TDC?

Thanks,

Yep. But you can only line up to the white mark when the vacuum advance is *disconnected*. With the vacuum advance *connected* the red mark will almost line up but not quite, since you're using a carb flywheel with an EFI vacuum advance diaphragm.

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[marvis]

I am an idiot.

I checked the vacuum line and it had some silicone in it, blocking it.. I installed a new vacuum line and set the timing to 17 BTDC with it connected. Runs awesome now..