ToolmanRob
05-24-2014, 04:27 AM
Hey all.
I am having issues with an efi system and ran across this site. Cool. I do not have any specific questions yet but plan to use the search button extensively as a start.
My project started out as trying to get an engine rebuilt for my wife's 1993 Chevy Stepside with 5.7 TBI. It has seen better days cosmetically but all our children came home in it after they were born so the plan is to keep it. Personally I either want it or one like it as my backup daily driver. While investigating a rebuild I found out a local builder could sell me a rebuilt vortec for only $150 more than the tbi motor so......only $150 more for roller cam and better heads?......and the project creep began.
The engine has been rebuilt and installed along with an edelbrock intake, holley tbi plate adapter, new higher pressure higher volume fuel pump, and a tbichips chip(apparently my first big uh-oh). It idles OK but spits back through the intake between 2500-3000 rpm. I gotta do some reading to see if I want to buy the stuff to try to tune it myself or just get some forum recommended person to make a chip for me.
My mechanic told me the fuel pump was making 60psi and the tbi regulator spring is not strong enough so extra fuel is getting dumped in. He is running it on an 18psi source from outside the vehicle at the moment. I think I may need an extra pressure regulator to drop the pressure closer to 18-20psi before it goes in the tbi unit. The spring in the tbi regulator is supposedly a new 18psi version.
Feel free to offer advice but I will wait to officially request any until I can learn a little more.
Rob
I am having issues with an efi system and ran across this site. Cool. I do not have any specific questions yet but plan to use the search button extensively as a start.
My project started out as trying to get an engine rebuilt for my wife's 1993 Chevy Stepside with 5.7 TBI. It has seen better days cosmetically but all our children came home in it after they were born so the plan is to keep it. Personally I either want it or one like it as my backup daily driver. While investigating a rebuild I found out a local builder could sell me a rebuilt vortec for only $150 more than the tbi motor so......only $150 more for roller cam and better heads?......and the project creep began.
The engine has been rebuilt and installed along with an edelbrock intake, holley tbi plate adapter, new higher pressure higher volume fuel pump, and a tbichips chip(apparently my first big uh-oh). It idles OK but spits back through the intake between 2500-3000 rpm. I gotta do some reading to see if I want to buy the stuff to try to tune it myself or just get some forum recommended person to make a chip for me.
My mechanic told me the fuel pump was making 60psi and the tbi regulator spring is not strong enough so extra fuel is getting dumped in. He is running it on an 18psi source from outside the vehicle at the moment. I think I may need an extra pressure regulator to drop the pressure closer to 18-20psi before it goes in the tbi unit. The spring in the tbi regulator is supposedly a new 18psi version.
Feel free to offer advice but I will wait to officially request any until I can learn a little more.
Rob