Question about 1991 GMC Sonoma

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I have replaced distributor cap, rotor button,plugs and wires

I have replaced distributor cap, rotor button, plugs and wires but still will not start. It does turn over but not start. Need the firing order on cap to make sure that I have it right.

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I had the same problem. Google your engine I had a 4.3. Click images for fiiring order you will find it. You can also click video for setting timing. I got mine running with this information. Just remember that there are two marks on the harmonic wheel one for TDC & BDC. Also you need 3 things air/fuel/spark. Make sure you have these before replacing parts it gets spendy. I got my whole distributer and spark module for 40.00.

Posted on Jul 27, 2010

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How do I find the timing marks on a 1992 voyager


Sounds like you replaced the distributor without setting #1 at TDC? The distributor cap should indicate which plug is the #1 plug wire. If there are no inspection plugs you can pop out to see the timing marks on the camshaft gears you will need to disable the starting system (fuel flow) remove #1 plug and turn it over until #1 piston is at TDC on the compression stroke. Then insert the distributor cap with the rotor on it, taking note of where the #1 plug tower is on the cap. Once the dist is installed place the cap on and make sure the end of the rotor is aligned with the #1 tower inside, if it is your good to go. If not take the dist out and turn it a bit left or right then put it in again until it lines up correctly (may take a few tries). Once aligned secure everything, replace spark plug and it should fire up.

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How to Replace a Distributor Cap in Toyota?


Its a plastic cap and and on its top the sparks wires get connected.A small plastic rotor spins inside the distributor cap, firing each spark plug as it rotates. If the distributor gets faulty there the engine may not perform well. in most cases it has been noticed that only replacing the cap does not helps but with cap the rotors also need to be replaced. The procedure is as follows:--- 1) First of all disconnect the negative battery terminal. 2) Then remove the spark-plug wires . Note:-- Before removing the spark plug wires please note down how and where the wires are connected,then only remove the connections. 3) Then on the distributor there will be a cap.remove that cap.the cap is connected by two pins.you will have to press the pins from each side to loosen the distributor cap.Then lift the distributor cap from the top. 4)Then remove the rotor From distributor The rotor is fitted with two screws.Remove the screws and loosen the rotor. 5) Then lift the rotor out from its shaft. 6) To install new rotor and cap.reverse the procedure. This will help.Thanks.

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1 Answer

Car wont start only backfires


you are out of timing with the distributor
pull the distributor out
remove a no1 plug to determine tdc compression stroke ( put your finger over the plug hole and pressure is compression stroke )
check the timing mark on the balancer pulley and align it to 112 degrees btdc \ on the distributor there should be a mark like a hacksaw cut across the lip of the body
align the rotor button to that mark
when it slips down it will turn
pull it back out and move the rotor button before or after so that when finished the rotor points to that mark and the clamp for the distributor is in approximately the center f the slot
do ypor wiring order from that first wire

Aug 06, 2017 | Cars & Trucks

3 Answers

I have a 1993 chev pick-up v6 4.3, i just installed new spark plugs,new plug wires, distributor cap and rotor button.All plug wires are back in the right position,and i used the firing order 1-6-5-4-3-2...


This diagram is for 1998-1995 Chevy 6 cylinder 4.3L engines.
Your got the firing order exactly correct, at 1-6-5-4-3-2, but here's the thing to double-check:
The distributor rotation is clockwise (note badly rendered arrow in picture).



archaeology_96.jpg

Since you probably got everything right, then you're left with really unusual/rare causes of
failure of the ignition system:
(a) rotor button misaligned/failing to make contact?
(b) rotor button not pressed onto distributor shaft far enough therefore failing to provide correct
proximity to distributor cap contacts when coil fires
(c) coil wire or contact loose/disconnected - press coil wire firmly down into distributor cap.
(d) distributor shaft of other damage caused during installation of rotor.
(e) spark plug wires defective from factory
(f) spark plugs defective from factory
(g) battery low - may need a charge to start
(h) ICM (ignition control module) failure - hook up your HEI (high energy ignition) tester, and
watch the quality of the spark on each cylinder.
(i) fuel problem? If spark is being properly delivered, its gotta be a fuel problem...
(j) distributor cap not screwed down flush to top of distributor? maybe just on one side?

Inspect the inside of the distributor cap - if there are lots of little metal bits all over the inside
of the distributor cap, then you know you have a misalignment of some type in there, and the
rotor and cap are destroying each other. normal operation will throw a quota of spark-ed off
metal bits inside the distributor cap, but since your cap is brand new, your attempts to start
the engine should have rotated the distributor so few times, you should see no metal debris.

Inspect the distributor cap contacts to see if any spark marks are more of less in the middle
of the cap's proper "contact zone". If not, you've diagnosed an internal misalignment, which
you know how to correct.

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I need to replace ,the rotor button...


TAG OR NUMBER ALL SPARK PLUG WIRES ON THE DISTRIBUTOR CAP BEFORE REMOVING CAP. SO YOU CAN PUT PLUGS WIRES BACK IN THE ORIGINAL POSITION. WHEN ALL PLUGS WIRES ON DISTRIBUTOR CAP BEEN NUMBER.REMOVE ALL PLUG WIRES ON CAP.THEN REMOVE THE DISTRIBUTOR CAP.THEN MARK ROTOR POSITION WITH SHARPIE MARKER THEN REMOVE THE ROTOR.

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2 Answers

The motor is turning over but not firing up. I removed a spark plug wire to see if it was getting spark, nothing. I then replaced the wire n removed the wire running to the coil, then i got sparks. I...


sounds like your rotor is bad, it does happen, and that would explain no spark to ignition wires to the plugs-look inside the distributor cap too, and replace it if you see moisture, hairline cracks, or the terminals are badly oxidized.

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1 Answer

My 2003 gmc v6 just had its plugs and wires and distributor cap and button changed and i put the distributor button on wrong, it ran fine 4 a mon. or 2 and one of the screws came out of the button and...


The distributor cap and/or the ignition rotor most likely have a crack somewhere and the distributor cap should be replaced along with the ignition rotor. The ignition module could have been damaged as well as the ignition pick-up coil/stator and if replacing the distributor cap and ignition rotor does not solve the problem then the ignition module or the pick-up coil/stator assembly inside of the distributor is also most likely damaged and the distributor will need to be replaced. There is a certain procedure for removing and replacing the distributor, and the ignition timing is not adjustable and it is not set using a timing light or with the engine running, and if you do have to replace the distributor Let me know if you require the procedure to properly remove and replace the distributor or if you require any further assistance.

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If you're talking about the distributor cap and rotor. I dont know what size engine you have, but it's pretty much the same. Mark your wires with a piece of tape and write a number on each one. When you remove the wire from the cap, ONE AT A TIME, mark that location on the OLD cap with the same number. (you can remove them and immediately put them on the new cap IN THE SAME LOCATION, but it can get in the way) After all the wires are off, take the two screws out of the base of the cap and lift up on it.

Now...Take the two caps and place them next to each other, and mark the new cap exactly as you did the old cap.

Leave them there for a minute. Go back and take the 2 screws out of the rotor. Place the new one in place and tighten,first making sure you have it in the right position. Look at the bottom. There should be a square prong, and a round prong. They're there to make sure you don't put it on backwards.

Go back and get the cap from where you left it and put it back on in the same position. Put the wires back on starting with the last one you took off and work your way back to number 1.

Don't be afraid to take a picture of it before you start. Just because.


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1 Answer

What order do plug wires go on distributor cap


Firing order is 1-8-4-3-6-5-7-2. Move #1 cylinder to where piston is up, and on the compression stroke (TDC). Easiest way to do this is with a compression tester on the #1 cylinder - rotor cap OFF. When you see the pressure build...you're on the compression stroke.
The rotor cap should be at the #1 cylinder firing position...simply re-install the rotor cap at this time - noting which button is #1.
Starting at #1 install the wire for the #1 cylinder onto the rotor cap...the next button (clockwise) on the cap should correlate to #8; the third button on the rotor cap is, cylinder #4..and so on.
work your way around the rotor cap until you have all 8 cylinder wires in place...ignition coil wire in the middle button.

Engine should start and run.

Hope this helps.

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2 Answers

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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

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