Question about 1994 Chevrolet C2500

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What is the manufacturer's specification on ignition timing?

Had the distributor changed and now it is back firing I have new plugs and wire but I want to check the timing too

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  • Chevrolet Master
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When did it start back firing? The reason for the question is if it has been back firing since you put the new dist. in it maybe one tooth off on the firing order. To check and see if this is the case rotate the engine to TDC on the timing tab ( which should put #1 piston at the top of cylinder) , remove the dist. cap and see if the rotor is pointing to number ! plug wire. If it is not pull the dist. and reset it till the rotor points to #1 plug. Hope this helps.

Posted on May 03, 2015

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  • Chevrolet Master
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I would recheck the firing order for the plugs as that will be the cause of the back firing
the timing will be 12 degrees advanced

Posted on May 02, 2015

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FIRING ORDERS printpage_icon.gif

Before carrying out extensive tests to isolate poor running problems, check connections of spark plug wires. This is especially important if plugs, wires, distributor, etc., have been disturbed recently for service. Obviously, this is not applicable to the wireless 4.7L engine.

NOTE To avoid problems, remove and tag the spark plug wires one at a time to ease reinstallation.
For vehicles with an extensive service history, keep in mind that the distributor could have been removed previously and rewired. The resultant wiring would hold the correct firing order, but could change the relative placement of the plug towers in relation to the engine. For this reason, it is very important that you label all wires before disconnecting any of them. Also, before removal, compare the current wiring with the accompanying illustrations. If the current wiring does not match, make notes in your book to reflect how your engine is wired.


0900c152800c0637.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. 2.5L Engine Firing Order: 1-3-4-2 Distributor Rotation: Clockwise


0900c152800c0638.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. 3.9L Engine Firing Order: 1-6-5-4-3-2 Distributor Rotation: Clockwise


0900c152800c0639.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. 5.2L and 5.9L Engines Firing Order: 1-8-4-3-6-5-7-2 Distributor rotation: Clockwise


0900c152800c063a.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. 4.7L Engine Firing Order: 1-8-4-3-6-5-7-2 Distributorless Ignition


0900c152800c063b.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. 8.0L Engine Firing Order: 1-10-9-4-3-6-5-8-7-2- Distributorless Ignition
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Changed plugs and wires on a 94 ford explorer and now it 's not tunning right. need a diagram. please.


FIRING ORDERS NOTE: To avoid confusion, remove and tag the spark plug wires one at a time, for replacement. If a distributor is not keyed for installation with only one orientation, it could have been removed previously and rewired. The resultant wiring would hold the correct firing order, but could change the relative placement of the plug towers in relation to the engine. For this reason it is imperative that you label all wires before disconnecting any of them. Also, before removal, compare the current wiring with the accompanying illustrations. If the current wiring does not match, make notes in your book to reflect how your engine is wired. Fig. 1: 1991-94 2.9L and 3.0L Engines Firing order: 1-4-2-5-3-6 Distributor rotation: Clockwise 85552008.gif
Fig. 2: 2.3L, 2.5L Engines Firing order: 1-3-4-2 Distributorless ignition 85552010.gif
Fig. 3: 1995-99 3.0L Engines Firing order: 1-4-2-5-3-6 Distributorless ignition 89682g23.gif
Fig. 4: 4.0L Engines Firing order: 1-4-2-5-3-6 Distributorless ignition 85552009.gif
Fig. 5: 1996-99 5.0L Engines Firing order: 1-3-7-2-6-5-4-8 Distributorless ignition 89682g24.gif
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2 Answers

I took of*** my spark plug wires working on my small block 350 pickup and I don't remember the the firing order to put the new wires back on. Is there a diagram anywhere or is it even that difficult to...


Next time number each lead before you remove it and no. the dissy cap as well

The firing order, which should be cast into the intake manifold, for the chevy small block V8 is 1-8-4-3-6-5-7-2. The firing order is the numerical sequence in which the spark plugs are fired. The insertion position of each spark plug wire around the circumference of the distributor cap can be found according to a clock face. The insertion sequence determines the firing order. The firing order is followed clockwise around the distributor cap starting from the 6:30 position with the 6:30 position being the number one cylinder spark plug wire.
On classic chevy small block engines that use ignition breaker points instead of electronic ignitions, the number one cylinder is the one immediately clockwise of the small metal sash cover on the distributor cap. The firing order starts here. There is no sash cover on the distributor cap for GM HEI electronic ignitions, and the firing order is the same, but starting at the 5:30 position.
The firing order makes sense if you know how the cylinders are numbered. The number one cylinder is the front most on the drivers side and 2 being the front most on the passenger side. From front to back, the cylinders are odd numbered on the drivers side, and even numbered on the passenger side.
See the diagram; Click to open a printable larger image in a new window. The firing order starts with the number one cylinder. We would connect the number one spark plug wire to the distributor cap terminal in the 6:30 position. distributor.pngSince the next cylinder in the firing order is 8 (passenger side rear), we connect the number 8 spark plug wire to the next distributor cap terminal (approximately 7:30 position) in the clockwise direction from number one. You need to be sure you continue the firing order in the clockwise direction around the chevy small block distributor cap from the last installed spark plug wire. Setting the rest of the firing order is just a matter of repetition. Be sure to count the spark plugs from front to back on each side of the motor to identify the correct cylinder number in the firing order.

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If you connect the vacuum line(s) to the distributor and the engine runs poorly then all of the vacuum line(s) to the distributor will have to be checked and then connected to their proper vacuum source.

If the ignition wires are leaking secondary voltage you might get a good secondary voltage shock if you touch the distributor to turn it. Let me know if you need help connecting and using a timing light, or if you require any further assistance.

Here is a firing order diagram to help assist you.


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