Honky Kong jr
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Gotchya
95 tbi 454 in a 86 c10
- Thread starter 74propu
- Start date
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yevgenievich
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Sounds like pumps should solve it
4WDKC
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Buy the EP387 delco pump for the vortec trucks, it is supposed to fit and should you ever swap to the vortec intake it will support it. They are fairly cheap also.
Vaughn
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You should have a look at this guide for troubleshooting TBI systems.
http://www.73-87chevytrucks.com/techinfo/TroubleshootingTBISystems.pdf
The rpm changes you are seeing usually denote a vacuum leak of some kind, especially since the problems are at a lower rpm and disappear at higher rpms. Check the large potential vacuum leaks like the brake power booster and the pcv valve by blocking those items off with vacuum caps to test them, this will quickly tell you whether there is a problem with those items.
Check and reset the IAC valve. Replace the EGR valve if hasn't been replaced yet. A bad EGR will cause rough running at or near idle.
What is the current fuel pressure at the throttle body itself? Knowing the fuel pressure at the tanks is useful, but it doesn't help identify all the possible restrictions in the fuel system. Replace the fuel filter just forward of the tanks (if you used that part of the fuel system from the 95).
Changing the fuel pump is worth a shot, but unless the TBI is experiencing lean mixtures all of the time, it might not be the fuel pressure. 95 was a change over year, so your TBI may still use 14 psi, and is more likely to use the older system if you got the motor out of a 3/4 ton 95 vehicle.
http://www.73-87chevytrucks.com/techinfo/TroubleshootingTBISystems.pdf
The rpm changes you are seeing usually denote a vacuum leak of some kind, especially since the problems are at a lower rpm and disappear at higher rpms. Check the large potential vacuum leaks like the brake power booster and the pcv valve by blocking those items off with vacuum caps to test them, this will quickly tell you whether there is a problem with those items.
Check and reset the IAC valve. Replace the EGR valve if hasn't been replaced yet. A bad EGR will cause rough running at or near idle.
What is the current fuel pressure at the throttle body itself? Knowing the fuel pressure at the tanks is useful, but it doesn't help identify all the possible restrictions in the fuel system. Replace the fuel filter just forward of the tanks (if you used that part of the fuel system from the 95).
Changing the fuel pump is worth a shot, but unless the TBI is experiencing lean mixtures all of the time, it might not be the fuel pressure. 95 was a change over year, so your TBI may still use 14 psi, and is more likely to use the older system if you got the motor out of a 3/4 ton 95 vehicle.
Last edited:
twinturbo427
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A warning about buying ACDelco parts: the pumps are sold under the same part numbers through two different product lines, Professional and Advantage. The Professional is the real-deal quality part while the Advantage is chinese made low quality stuff to hit a price point for parts stores.
Professional is the matte finished cardboard box you know and love.
Advantage is glossy and shiny, and has the guarantee right on the box.
Do you know why they put the guarantee right on the box?
Professional is the matte finished cardboard box you know and love.
Advantage is glossy and shiny, and has the guarantee right on the box.
Do you know why they put the guarantee right on the box?
74propu
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I put 2 new pumps in today and now it runs right put it in gear and it will stay running and will idle up to compensate drove it around the block now when you stomp on the load peddle it will smoke the tires . So while the bed is off I put the air bags in and plumed them . so all in all I am happy as a pig in mud
Thank youall for the help
Thank youall for the help
ajd89
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Wow that's a lot of dancing bananas! Glad your truck is running right. Smoke them babies off!I put 2 new pumps in today and now it runs right put it in gear and it will stay running and will idle up to compensate drove it around the block now when you stomp on the load peddle it will smoke the tires . So while the bed is off I put the air bags in and plumed them . so all in all I am happy as a pig in mud
1987 GMC Jimmy
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Awesome, bud!
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You are killing me with this... Why is it on the box?!
twinturbo427
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Honky Kong jr
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xc_hide_links_from_guests_guests_error_hide_media
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Lol, I figured that might be the reason.
Honky Kong jr
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Lol you beat me by 3 mins.
74propu
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Yesterday I put a new to me speedo that I got from HotRod pc in my 86 and it didn't work . so today I pulled the dash apart found the wire marked speedo coming from the drac unit then found the other end in the gauge cluster plug used a ohm meter on the wire it was dead (DEAD) as hell . So I cut the wire 6 in from the plug and taped a new wire to it so I could pull a new wire threw the dash went to the pass side and started pulling the wire threw the dash. that is when I found out why my speedo didn't work. when the ass wipe was running the wiring threw the dash he did a good job on the splice at the plug but on the drac end he just tied a knot in the wire (what a ass jack) so new wire and spliced in the speedo now works . ( Before you ask I did all the wiring on my trucks) so I am the puck tard
