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What is the position of the plug wires on the distributor cap? on a 1987 gmc sierra 350 5.7L

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Here is a diagram, just match up the colors

what is the position of the plug wires on the - 526b72b.gif

Posted on Jul 29, 2010

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# 1 cylinder is front on drivers side going back 3,5,7 ... passenger side is 2,4,6,8 ... Distribtor # 1 should be pointing approximately at #1 cylinder going around clockwise .. 1 8 4 3 6 5 7 2 .

Posted on Jul 29, 2010

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1 Answer

1994 GMC 1500 Sierra 4.3 will not start acted like out of time so I replaced cap rotor plugs check plug wires .also replaced timing chain and gears even though no problem also changed ecm any ideas


The distributor gear. It wears down and causes rough idling to no start. Pull the distributor, look where the rotor button is pointing as it needs to go in the exact same position. you can get just the gear and replace it. it is held in by a drive pin. Push it out and swap gears and reuse the drive pin. hammer it in.

Aug 17, 2011 | 1994 GMC Sierra

1 Answer

97 gmc 2500 5.7l vortec, won't start, fuel pump works, tried using starting aid and nothing, hooked up a scan tool, and no errors came up, could it be the crank position sensor? or the distribution centre...


See if you have spark on at least two plug wires. If you do, but it is weak, you may just need a good tune up (plugs, wires, distributor cap, and distributor rotor). If you don't have spark or it is only on one wire, take the distributor cap off and see if the distributor is turning while someone turns the key. If it doesn't spin, you need a distributor because the bottom gear is broken or stripped. If it does spin, then it could be the coil, ignition module, crank sensor, fuse or wiring to any of these parts. It will take a lot of wire testing and diagnostics to figure out which part it is if it isn't just a simple tune up or distributor.
Hope this helps. Good luck!

Apr 12, 2011 | 1997 GMC Sierra

1 Answer

How do i change the distributor cap in my 2003 gmc sierra?


this truck uses coil on plug (distributorless) ignition. there is not distributor, therefor no cap. there is an individual coil pack for every cylinder, with a very short wire going to each plug.

Jun 26, 2010 | 2003 GMC Sierra 1500

2 Answers

How do you set the timing on a 1998 GMC Sierra?


The timing is not adjustable and it is computer controlled, but the distributor must still be clocked in properly and static timed, and here is how it is done.

There is a mark or notch on the distributor housing that the rotor should be pointing to when the engine is on top dead center. This static timing is all that matters and the computer will be able to control the timing as long as the ignition rotor is in that position when the engine is at top dead center.

1. Place the engine at top dead center.

2. Look under the distributor cap and find where the number one terminal runs under the distributor cap, and where that position on the distributor cap corresponds with the distributor housing, and it should match up to a mark or a notch on the distributor housing.

3. With the engine on top dead center the ignition rotor should be pointing to the mark or notch that is on the distributor housing, if it is not then loosen up the distributor and turn the distributor until the ignition rotor is pointing to the mark or notch on the distributor housing, the engine should now be static timed.

Jun 12, 2010 | 1998 GMC Sierra

2 Answers

OK 1997 gmc sierra 5.7liter 4x4 replaced coil and


Doesnt this engine use a crank position sensor? mounted on timing chain cover.I would check that first

Oct 17, 2009 | 1997 GMC Sierra

1 Answer

In what order do yu arrange the plug wires on the distributor cap or a 1990 gmc 350


1-8-4-3-6-5-7-2 Distributor turns clockwise Number one should be in the 5 oclock position. You should be able to draw an imaginary straight line between the coil tower and number one tower on the cap and the number one spark plug.

May 15, 2009 | 1990 GMC Sierra

2 Answers

1987 GMC Jimmy Distributor cap and Rotor replacement


A diagram may not be needed as its a reasonably easy fix to do on your own.the distributor ca p will only fit on properly one way because at the base of the cap locaters can only fit the distributor if they line up.When doing the spark plug leads do them one at a time and if nessecary write or mark leads as 1,2 etc .The rotor can only fit on one way but put a mark on the distributor to show where the rotor was pointing when you took it off and if it still points there when the new one is fitted.When changing distributor cap and leads they have to go to the correct place.Pays to mark the outside of distributor cap where the locating bits are On the new and old one.Fit the new cap and rotor then take a spark plug lead and fit to new cap 1 at a time.You can tell by lining up the marks on the outside of the distributor cap when you hold them one on top of the other.Good luck

Oct 20, 2008 | 1987 GMC Jimmy

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