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Old 11-28-2012, 03:24 PM
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New Start up...350 efi timing help??

I have a 5.7 350 vortec .30 over
comp cams 08-300-8 (grind cs 262h-r12)
duration at .050 206(intake) and 210(exhaust)

I have gotten the motor installed back in the truck.

Long story short... I have removed and re-installed the distributor many many times now and just can't seem to get this thing timed right.

I have been too far advanced and to far retarded.

Just can't seem to set this thing up.. used a tdc stop a few times for tdc.

Also had an old timer come over to help and he helped me set it up just my feeling the cylinder pressure with his thumb. Still didn't work.

Any help appreciated. I'm stuck!

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Old 11-28-2012, 03:38 PM
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That is a 98 by the way.
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Old 11-28-2012, 03:47 PM
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Quote:
Originally Posted by abbazabba View Post
I have a 5.7 350 vortec .30 over
comp cams 08-300-8 (grind cs 262h-r12)
duration at .050 206(intake) and 210(exhaust)

I have gotten the motor installed back in the truck.

Long story short... I have removed and re-installed the distributor many many times now and just can't seem to get this thing timed right.

I have been too far advanced and to far retarded.

Just can't seem to set this thing up.. used a tdc stop a few times for tdc.

Also had an old timer come over to help and he helped me set it up just my feeling the cylinder pressure with his thumb. Still didn't work.

Any help appreciated. I'm stuck!
Assuming there are no other faults and with a Vortec there are many places where this can go wrong, the distributor needs to be set up with zero advance. The computer will establish all advance including the base setting.

The front timing cover has a sensor that looks for the crankshaft number 1 position. You need to time the damper to this sensor first.

The SBC times the cam to the number 6 cylinder when the pip marks on the cam and crank gear face each other. One crank rotation from that point which puts both marks in the 12 O'clock position then is set to number one cylinder.

All of this in the above paragraphs has to be coordinated; is it?

Bogie
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Old 11-28-2012, 04:02 PM
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No

How do I time the damper to the sensor? (Crank position sensor right?)

----"The SBC times the cam to the number 6 cylinder when the pip marks on the cam and crank gear face each other. One crank rotation from that point which puts both marks in the 12 O'clock position then is set to number one cylinder."----

Not sure about this one. I set the timing marks on the crank and cam gear so they were pointing directly at each other. I obviously can't see the gears any longer to verify what you are saying.

Thank you for your help!
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Old 11-28-2012, 04:16 PM
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On my 96 there was a punch mark on the block to line up the damper mark. Very hard to see. Had to take the rad shroud off and with finger in the #1 hole bump motor over till marks line up. Stab the dist. Then you need some one with a hand held capable of setting timing, but motor should run fine until you check timing.

Don
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Old 11-28-2012, 04:21 PM
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So a mark on block and the line on balancer? I will look for that.

Thanks
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Old 11-28-2012, 05:31 PM
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Quote:
Originally Posted by abbazabba View Post
No

How do I time the damper to the sensor? (Crank position sensor right?)

----"The SBC times the cam to the number 6 cylinder when the pip marks on the cam and crank gear face each other. One crank rotation from that point which puts both marks in the 12 O'clock position then is set to number one cylinder."----

Not sure about this one. I set the timing marks on the crank and cam gear so they were pointing directly at each other. I obviously can't see the gears any longer to verify what you are saying.

Thank you for your help!
If they were still pointing at each other when you put the distributor in, and you aligned the the rotor to number one, then your timing is 180 degrees off as the cam was left set aligned to number 6 at TDC.

I know this can be confusing, one of GM's little intellectual gifts to the mechanics of the world.

Probably the quickest way to find out where it really is would be to remove the drivers side rocker cover so you can see the valve action on number 1. Put a wrench on the damper bolt and turn the engine over in the normal direction (clockwise when standing in front of the vehicle) watching the valve action. When both valves are closed and the piston is at TDC the timing marks should be aligning to zero (the cylinder is ready to fire), then check to see where the rotor is. If not pointing at number one make whatever the correction is (rotate the housing or remove and realign the distributor to get the proper rotor to cylinder alignment.

Bogie
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Old 11-28-2012, 05:47 PM
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Okay sounds like I didn't have tdc lined properly.

Would my motor run if it was 180 off?
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Old 11-28-2012, 05:49 PM
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Okay sounds like I didn't have tdc lined properly.

Would my motor run if it was 180 off?
No, but it will backfire and stumble around a lot.

Bogie
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Old 11-28-2012, 05:53 PM
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I will get to it first thing in the morning. Let you know what comes of it.

Thanks for the info.. I have hope again.

I will keep ya posted.
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Old 11-30-2012, 02:11 PM
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Well....

So I did all of the above with no success.

Took my valve cover off(which was a total pain in the rear) gotta love those new vehicles.

Verified that tdc is lining up with balancer markings as well as valve position.. also looked in cylinder with mirror and I can see the piston.

pulled dizzy cap and sure enough my pointer is on the number one plug.

Soooo... im stuck again.

Any help would be wonderful.
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Old 11-30-2012, 03:37 PM
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The distributor only directs the spark and outputs the camshaft position, the crank position and hence timing are accomplished by the crank sensor in the timing cover.
What does it do when you try to start it?
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Old 11-30-2012, 04:35 PM
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When you say its out of time. Does it have fire at all. If the computer does not get the crank single it usally will not fire the coil and plugs wont fire.

Do you have spark and it wont start does it fire the injectors. Or does it start and just not read right with timing light or runs poorly.

Sorry didnt catch what the problem was after installing the distributor. Was it running at one time before you pulled the distributer.

Sorry for all the questions and no good answers. Test the crank sensor and make sure its working properly. Oem shop manual may have a test proceedure.
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Old 11-30-2012, 05:07 PM
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I have a 5.7 350 vortec .30 over
comp cams 08-300-8 (grind cs 262h-r12)
duration at .050 206(intake) and 210(exhaust)

First ever turn of the key in the truck it started and ran.

Immediately it was off.

The idle seemed way low. about 500 rpm if i let it fall it would die.

The engine seemed sluggish not firing right.

I have reset the distributor many times and have had it hard to start or just crank crank crank. Both.

Has started several times during distributor re-positioning.


Yes I will test the crank sensor.


A local shop owner says you absolutely have to use a computer to set the timing on these?

Any thoughts on that? Software to buy?

I'm tempted to fork over some dough and get this done at the shop.



Thanks for the help.
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Old 11-30-2012, 05:23 PM
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Quote:
Originally Posted by abbazabba View Post
I have a 5.7 350 vortec .30 over
comp cams 08-300-8 (grind cs 262h-r12)
duration at .050 206(intake) and 210(exhaust)

First ever turn of the key in the truck it started and ran.

Immediately it was off.

The idle seemed way low. about 500 rpm if i let it fall it would die.

The engine seemed sluggish not firing right.

I have reset the distributor many times and have had it hard to start or just crank crank crank. Both.

Has started several times during distributor re-positioning.


Yes I will test the crank sensor.


A local shop owner says you absolutely have to use a computer to set the timing on these?

Any thoughts on that? Software to buy?

I'm tempted to fork over some dough and get this done at the shop.



Thanks for the help.
I been there. No shame in letting the shop do the dirty work. Skip the software purchase they are super expensive if sold by gm. Do you have the OEM shop manual. Usally you can find them on the net. It will have a proceedure to replace the distributer. It will tell you how to time the engine.

Sometimes you need to just reset the Computer others have a jumper that locks out the timing. Got to follow the factory proceedure and it should be fine.

Have you tried a timming light to see where the timing is and how it responds to hitting the gas. It should still be close. Make sure sensors are clean and wiring is in good shape.
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