Wiring diagram for firing order

BOB IZUMI

MEMBER
1998 GMC SIERRA
V8
4WD
AUTOMATIC
218,000 MILES

I just changed the cap, rotor, plugs and wires and can't get it to fire, i'm looking for the diagram for the firing order?

Thursday, February 26th, 2009 AT 9:12 PM

7 Replies

RASMATAZ

MECHANIC
75,992 POSTS

Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.

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Thursday, February 26th, 2009 AT 9:23 PM

KORTEGA

MEMBER
1 POST
1998 GMC SIERRA
V8
4WD
AUTOMATIC
10,000 MILES

I need the firing order for my truck it has a 5.0 vortec engine

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Thursday, May 23rd, 2019 AT 2:52 PM (Merged)

BLUELIGHTNIN6

MECHANIC
16,542 POSTS

Firing order 1-8-4-3-6-5-7-2

| 2 4 6 8 1 3 5 7 | Distributor rotates clockwise.

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Thursday, May 23rd, 2019 AT 2:52 PM (Merged)

NEWAVDAVE1

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1 POST
1989 GMC SIERRA

Electrical problem V8 Four Wheel Drive Automatic 100000 miles

need firing order & diagram please I love this site.

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Thursday, January 21st, 2021 AT 9:04 AM (Merged)

KEN L

MASTER CERTIFIED MECHANIC
48,363 POSTS

The firing order is V8 18436572 here is both the v6 and v8 engine (below).

v6 - Firing Order1-6-5-4-3-2

Here is a guide to show you how to tune up your car

https://www.2carpros.com/articles/how-to-tune-up-a-car-engine

Spark plug wire stats.

0-15 inch cable 3,000 - 10,000 ohms.
15-25 inch cable 4,000 - 15,000 ohms.
25-35 inch cable 6,000 - 20,000 ohms.
NOTE: Longer wires should measure about 5,000 to 10,000 ohms per foot.

Please let us know if you need anything else to get the problem fixed.

Cheers, Ken

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