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Username Post: 88 k1500 350 odd firing motor        (Topic#345233)
14fjr1300es 
Forum Newbie
Posts: 4

Reg: 06-05-17
06-05-17 05:05 PM - Post#2694570    

I recently bought this truck and trying to figure out whats up with the odd firing it is doing. First I don't know if it is a 350 or if its original or from a junk yard or what? How do I find out what motor I have? Truck has 150k miles. It does run ok but just doesn't feel right and when I pulled the plugs that told me something is wrong. But here is what it is doing - cylinders 1, 4, 6 & 7 fire white hot. cylinders 2, 3, 5 & 8 burn cold. So I installed new plugs. I need to pull them and check to see what the new plugs tell me? Then I installed a new distributor and it made NO difference. Any ideas?



 




paulo57509 
Senior Member
Posts: 380

Loc: Tracy, CA
Reg: 07-18-00
06-08-17 01:35 PM - Post#2695116    
    In response to 14fjr1300es

  • 14fjr1300es Said:
I recently bought this truck and trying to figure out whats up with the odd firing it is doing. First I don't know if it is a 350 or if its original or from a junk yard or what? How do I find out what motor I have? Truck has 150k miles. It does run ok but just doesn't feel right and when I pulled the plugs that told me something is wrong. But here is what it is doing - cylinders 1, 4, 6 & 7 fire white hot. cylinders 2, 3, 5 & 8 burn cold. So I installed new plugs. I need to pull them and check to see what the new plugs tell me? Then I installed a new distributor and it made NO difference. Any ideas?



If you draw a diagram of the cylinder layout and then mark the "cold" and "hot" cylinders, you can clearly see a pattern that looks like the fuel distribution of a dual plane intake manifold (which a stock manifold is).

1-7-4-6 are the outside cylinders on one bank; the inside cylinders on the opposite bank.

2-8-3-5 share the same pattern, just inside/outside on each bank are reversed.

I suspect the engine is a TBI induction (?). My guess is that one of the TBI injectors is either spraying too much or too little fuel.


1987 IROC-Z 5.0L
1992 Lumina Euro 3.1L
2003 GMC Safari


Edited by paulo57509 on 06-08-17 01:36 PM. Reason for edit: No reason given.

 




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