1990 GMC C1500 Firing order

Tiny
EL_SISCO91
  • MEMBER
  • 1990 GMC C1500
  • 5.7L
  • V8
  • RWD
  • AUTOMATIC
  • 189,110 MILES
I'm stuck on trying to get everything write n for my truck could turn on but I don't know the firing order n how the go on the distributor cap it's a 350 bard to a 383
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Thursday, May 7th, 2015 AT 3:59 PM

5 Replies

Tiny
HMAC300
  • EXPERT
See pic rotor should point about 11:30 when installed with #1 on tdc.
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Thursday, May 7th, 2015 AT 4:16 PM
Tiny
EL_SISCO91
  • MEMBER
I try to do it that way but it didn't work
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Thursday, May 7th, 2015 AT 4:25 PM
Tiny
HMAC300
  • EXPERT
Then you probably have your wiring screwed up going to cylinders. This is the way chevy's have fired for 30 yrs. Are you sure you had #1 on tdc? Probably not.
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Thursday, May 7th, 2015 AT 5:07 PM
Tiny
EL_SISCO91
  • MEMBER
Well this is my first time working on this kind of whines n I'm not that shure how things go, how can I find the tdc n what comes after that
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Friday, May 8th, 2015 AT 1:10 PM
Tiny
HMAC300
  • EXPERT
Bring engine up to #1, remove spark plug and put finger in hole and either bump starter until you feel compression there should be a mark on harmonic balancer where it will line up with timing mark on timing chain cover. I do not have any pictures of this. IF you are unable to do that I highly suggest having a friend or someone who is familiar with cars to come over and help or do it for you. It's pretty simple to do. If you look closely at pic I sent you will see timing mark on front of engine diagram. However it will be small so try clicking on pic to enlarge it. The mark on balancer will go all the way across balancer. Once you get to start then use a timing light to time it. I'm sure you can't use the stock specks due to spark knock so it will be hunt and peck so to speak to get the right timing done.
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Friday, May 8th, 2015 AT 1:22 PM

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