Best way to go

Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.

Joined
Feb 1, 2023
Messages
16
Reaction score
11
Location
Oklahoma
What's going on people's so new to this site so I just swapped a gen 6 454 170k mile from a 1999 2500 suburban in my 1994 k5 blazer and I want to get rid of this stupid tbi but don't know which way to go wanted to keep the independent fuel injection but couldn't find anything on wiring the gen 6 stuff into a 1994 only ls stuff and was looking at the fitech stuff is that system any good?
 

Attachments

  • 20221027_153704.jpg
    20221027_153704.jpg
    366.9 KB · Views: 19
  • 20220905_215044.jpg
    20220905_215044.jpg
    227.7 KB · Views: 18
  • 20220921_165322.jpg
    20220921_165322.jpg
    351.5 KB · Views: 19
  • 20221024_164224.jpg
    20221024_164224.jpg
    346.9 KB · Views: 19
Joined
Feb 1, 2023
Messages
16
Reaction score
11
Location
Oklahoma
@95Suburban I've replaced everything on it just won't run right it run koo when first started but drive for about 20 to 30 mins acts like the it's not enough gas or just struggling can't give it throttle







@Schurkey I grabbed everything but ahead of time I knew a guy in the military sold me some humvee parts trans and transfer case so I have a 80e trans and np242 and just found a tbi 4l80 ecm



But I bought the truck in 2015 and who ever had it trashed the wires and everything so I'm putting him back together just trying to get it to where I can drive without have to pull over every 20 30 mins lol
 

Schurkey

Supporting Member
Supporting Member
Joined
Jan 14, 2018
Messages
11,526
Reaction score
14,670
Location
The Seasonally Frozen Wastelands
What engine was in the Blazer before the swap to a Vortec 454? Are you trying to run a 454 on a 305 computer and 305 TBI and injectors?

If it runs good for 20 minutes and then acts like it's starving for fuel...how is the fuel tank vented? Does it run OK if you leave the gas cap off?

Will the ignition coil fire a spark tester calibrated for HEI ignitions after it's been run for 20+ minutes?




Perpetual advice:

What is the fuel pressure when the truck is acting up?

Connect a scan tool, verify EVERY sensor and computer output.
 
Joined
Feb 1, 2023
Messages
16
Reaction score
11
Location
Oklahoma
@Schurkey it was a 350 tbi and no I changed the computer out to a 454 tbi out of a 1995 k2500 Silverado



No have never tried running it without the Gas cap



I'll have to take it and get the pressure tested that's what I was thanking it may be but the pump is brand new









would just put it in the shop but can't trust these shops out here in okc go in with 1 problem come out getting towed
 

PlayingWithTBI

2022 Truck of the Year
Supporting Member
Joined
Jan 3, 2019
Messages
9,814
Reaction score
15,408
Location
Tonopah, AZ
Also I don't know which pump you put in but the later TBI 454 runs a higher pressure then the small block TBI
^^^This, to elaborate - 94 - 95 7.4L TBI ran 28 - 32 PSI with smaller injectors while others' volume are based on 13 PSI. You s/b able to tell what you have by looking at their color and/or part #. If it is 94 - 95 7.4L you can throw in a 28 LB spring in it and use an EP381 pump from a 96 Vortec truck.
You must be registered for see images attach
 
Top