chevy p/u

dwight · Post by **dwight** » Fri Dec 10, 2010 1:17 pm

i don't use these rooms that much so i really don't know where to go. If i'm in the wrong place, let me know where to go. The question i have is not bonneville related but it is gm related. I have a 1993 chevy cheyenne 6-cyl, tbi. I need to know if everytime that you start and stop the engine, does the rotor always come back to the no. 1 plug? Again forgive me if this is not the place to ask this question. Thanks Dwight!

Post by **harofreak00** » Fri Dec 10, 2010 2:13 pm

Moved to Your Other Ride.

You will get more visibility if you choose a better subject heading.

Post by **J Wikoff** » Fri Dec 10, 2010 2:24 pm

The rotor does not go back to the #1 plug. It will stay synch'd with where the crankshaft is rotated to.

01bonneSC · Post by **01bonneSC** » Fri Dec 10, 2010 2:57 pm

Are you trying to put it at TDC on number 1?

00Beast · Post by **00Beast** » Fri Dec 10, 2010 5:52 pm

The engine does not always end with the #1 cylinder @ TDC. It ends wherever the engine comes to a stop at. The easiest way to get it to #1 TDC is to take a paper towel or a rag and roll it up, stick it into the plug hole w/ the plug out and the engine disabled so it won't start, and turn the crank with a wrench on the bolt on the balancer until the compression forces the rag out.

Also, when the proper timing is set, the rotor points at the post a few degrees before TDC, as that is what timing advance is.

Post by **myfirstbonnie** » Sat Dec 11, 2010 1:07 am

Or just locate the timing mark on the HB and hopefully nobody removed the indicator.

dwight · Post by **dwight** » Sat Dec 11, 2010 4:22 pm

00Beast wrote:The engine does not always end with the #1 cylinder @ TDC. It ends wherever the engine comes to a stop at. The easiest way to get it to #1 TDC is to take a paper towel or a rag and roll it up, stick it into the plug hole w/ the plug out and the engine disabled so it won't start, and turn the crank with a wrench on the bolt on the balancer until the compression forces the rag out.

Also, when the proper timing is set, the rotor points at the post a few degrees before TDC, as that is what timing advance is.

the problem i have is it will turn over and acts like it wants to start but doesnt. It has been sitting for a minute and i did take 1 plug wire off to use on another car. When i had to move the truck i did so w/o that 1 wire, would that have moved the timing off. I'm thinking distributor coil or the electronic module. Any help would be appreciated. thanks!

00Beast · Post by **00Beast** » Sat Dec 11, 2010 4:26 pm

You just removed a plug wire, but didn't mess with the cap, distributor or rotor? As long as you put a wire on there and it goes to the right plug there is nothing that you would have disturbed. All the timing happens inside the distributor, the wire is just responsible for carrying the spark from the distributor to the plug. As long as all the wires go from the correct post to the corresponding plug, there is nothing else they could mess up.

Post by **myfirstbonnie** » Sat Dec 11, 2010 8:59 pm

This should be OBD I, do the jumper and get any codes. Should be able to use this procedure:
http://www.pontiacbonnevilleclub.com/fo ... =51&t=8689

Or you can get the Haynes book and it will tell you how to pull the codes.

How long has his beeen sitting without being driven? You moved it with a missing wire, but did not specify if this was recently, a DD or was done 6 months ago.

Check all sensor wires and check for fuel at the TB. Verify the throttle plate is wet right after starting. If wet, press the accelerator a little when trying to start.

dwight · Post by **dwight** » Mon Dec 13, 2010 10:56 am

It has been sitting 6 months or longer, but i would start it up and let it run to keep it healthy. I had no trouble with it starting. Then a couple of months ago i had to pull a wire maybe two, 1 for sure, i think it was no. 6 wire. I know that it would start up and run because i had to move it sometimes, i tried starting it about 2 weeks ago and it would crank but not start. I have voltage to coil, which i thought that might be the problem but isn't. I have a couple of other checks that i can do later today, but if anyone has any ideas i would appreciate the help. thanks!

Post by **myfirstbonnie** » Mon Dec 13, 2010 1:04 pm

You have replaced the wires, correct? And verified they are all on the correct positions?

Check for fouled plugs, spark to the plugs and fuel. Check all wiring to make sure nothing looks worn or frayed.

00Beast · Post by **00Beast** » Mon Dec 13, 2010 1:07 pm

Make sure there aren't mice or rats living in the airbox or something, or have chewed through wires. You would be shocked at where those little buggers can get into...

dwight · Post by **dwight** » Wed Dec 15, 2010 4:13 am

Do i need to set tdc on the No. 1 plug or does it matter?

01bonneSC · Post by **01bonneSC** » Wed Dec 15, 2010 4:57 am

dwight wrote:Do i need to set tdc on the No. 1 plug or does it matter?

Set it to that to do what?

viper8907 · Post by **viper8907** » Wed Dec 15, 2010 5:57 am

dwight wrote:Do i need to set tdc on the No. 1 plug or does it matter?

If you're trying to reset the timing, then yes you need to set the engine to TDC on the #1 cylinder.

Post by **myfirstbonnie** » Wed Dec 15, 2010 11:44 am

I would check it first. If it hasn't been messed with since it was last running it should be ok. The timing will not move on a non running engine. Have you tried getting the codes? Have you tried giving it a shot of starting fluid.

dwight · Post by **dwight** » Thu Dec 16, 2010 10:11 am

I guess what i mean't was, once you set it on tdc, does or is it supposed to always come back to that cyl. number when you turn off engine. My manuel say's you tdc it on the no. 1 cylinder, so it should always come back to that number 1 cyl.

Post by **J Wikoff** » Thu Dec 16, 2010 12:25 pm

The distributor is gear driven. When you stop the engine, the distributor stops too. Say #5 is on the compression stroke when the engine stops, the rotor will be approaching the the contact to fire the #5 plug. When you restart the engine, #5 will fire first.

00Beast · Post by **00Beast** » Thu Dec 16, 2010 4:54 pm

Your engine has a 1/720 chance of stopping at TDC of the compression stroke of the #1 cylinder (there are 720* in one 4-stroke cycle, and TDC is only 1 degree). The engine just stops when there's no more force pushing the pistons down, and the compression works against the cylinders. You have to set it at #1 TDC to set timing when re-assembling an engine if you have removed the distributor if you turned the engine over while it was out or if you didn't mark where the rotor was upon removal.

If you are still not clear, TDC is when the piston is at the top of its stroke in the bore. It happens twice a cycle, at the end of the compression stroke, when the plug has already fired and the burning mix is pushing against it, and at the end of the exhaust stroke when it's being pulled down by the crankshaft, and pulling the fresh fuel/air mix. TDC is just the position of the piston.

dwight · Post by **dwight** » Fri Dec 17, 2010 12:05 pm

[c olor=#0000BF][/color] Ok, i got it now. I was under the impression that when you set at no. 1 that it would always return to no.1 pos. Before i asked you that question i looked at the rotor and it wasn't at no.1 so i thought thats's why it wouldn't start (silly me). Thanks a lot guys i appreciate the info, now if i can just get it started. later!

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