Mechanics

CHEVY CHEYENNE 4.3 WON'T START. REPLACED DISTRUBUTORCAP

1993 Chevrolet Truck

I resently replaced the distrubutor cap. On my 1993 Chevy Cheyenne. That has the 4.3 V6. While replacing it. I got a couple of the wires in the wrong place. And the guessed at it a few times. With no Luck. After that I came in and looked up the firing order which was 1, 6, 5, 4, 3, 2. CC. I put it in that order and still no luck. I have tried gapping the plugs, starting from different spots with the #1 wire. Trying it clockwise, I tried putting the old distrubtor cap, and router back on. And my truck will still not start. I have been messing with it now for a week. Can someone help me please?
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Born2play77
January 10, 2007.



Ignore the screw head marks.


http://www.2carpros.com/forum/automotive_pictures/30961_firin_ordor_2.jpg


But isn't that the same thing I have allready tried. You have the #1, on the drivers side correct?

Tiny
Born2play77
Jan 12, 2007.
It may be what you tried. I'm just saying recheck it. If it ran good before the work it should now. Installing wires is a little like proofreading your own work. No matter how many times you look at a misspelling, you don't always pick it up. Just trying to cover the basics first.

I'm trying to make sense out of a quick sketch I made at work yesterday. When I looked up the wiring placement it seemed to contridict another diagram. This is what I " think" I have : oops: The number one is the left (driver) front on the motor. On the cap, it is the the front side of the cap, first position cc from the screwhead.

I'm assuming there is spark happening and the plugs are not fouled out.

New plugs, new wires, new router, new distrubutor cap. Plugs are gapped, to 0.045. The #1 plug, is on the drivers side closest to the front of the truck (grill, headlights). Then going back 3, 5. Then 2, 4, 6 on the other side. Correct. I have that and worked on doubling checking that and the placement on the distrubutor cap for 2 days in a row. And the #1 plug, wire. On the distrubutor cap, goes closest and facing the #1 plug on the engine correct. And I have done that and put them in order of 1, 6, 5, 4, 3, 2. And tried in Clockwise and CC. I have even tried starting in all 6 different positions on the distrubutor cap just to see. After I messed up the order of the wires, I didn't go right away and check the firing order, I was stuburn and guessed at it a couple times first. And even got it started, and it kept backfiring. And even started to catch on fire. One person told me it might of jumped timing, but I ddin't think that was really a logical possibility.

Thank you so much just the attempt at help, means alot to me. I have spent so many hours out there. And it has been really frustraiting.

Tiny
Born2play77
Jan 12, 2007.
Have you brought the number one cylinder to top dead center and aligning the rotor to the number one position on the cap?

Doesn't it get off of TDC, every time you crank it attempting to start it? And also is that neccessary, since we didn't take off the actually distrubutor.

Tiny
Born2play77
Jan 12, 2007.
Yes it would.

I understand what was done, I'm not ready to jump into things that are dependent on basics.

Doing this will verify that you indeed have the number one cylinder firing at the right time. Say you put the rotor on backwards?

Since this problem wasn't present prior to your work, it means: An ironic thing happened that we don't know yet but will be dependent on basics that should get checked.

OR

There was somthing you did to get you in this pickle.
Good techs have the ability to no get overconfident and question themselves from another angle.

Anyways, pull the number one plug out. Take a screwdriver with a long handle and measure how deep the piston is and mark the screw driver with elect tape or what ever. Bump the starter, recheck and remark if it came up higher. Continue this until the piston drops. You should have a good idea of where the highest point is by the lowest point on the screwdriver. To fine tune it, you can manually spin the motor over with a socket and a breaker bar on the crank.

Once you have it there, check your rotor position.

Make sense to do this to you?

So I want it at its lowest point, not its highest? So when the screwdriver is in the most so to speak
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Tiny
Born2play77
Jan 12, 2007.
Before you do this take the cap off, take the rotor of and spin it 180 degrees, put back together and crank it.

No,
I knew I shouldn't have worded that way, sorry.

The closest point to the tip of the screwdriver, yeilds the highest point of the piston.


http://www.2carpros.com/forum/automotive_pictures/30961_tdc_1.jpg


Ok I have it in TDC. And the rotor, is facing the #1 spark plug on the D-cap. Still nothing.

Tiny
Born2play77
Jan 12, 2007.
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