Out with the TBI?

Tiny
FGR8FRK
  • MEMBER
  • 1993 CHEVROLET 1500
  • 5.7L
  • V8
  • 2WD
  • AUTOMATIC
  • 230,000 MILES
So, I've given up on what's ailing my 93 TBI.
I've decided to upgrade the cam and add a Holley Carb.
My question is, will everything else still work if I add a TPS to the carb for the 4L60E, and keep the MAP sensor for the timing?
I know I'll need to add a fuel regulator and do some plumbing.

Was going to go the Holley Terminator X Max route but their prices have recently gone up on everything and I was going to have to add a Trans controller because of the early 4L60e and at $4,000 without the Cam I'm looking at other options.
Thursday, June 12th, 2025 AT 10:38 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 52,273 POSTS
I would keep the TBI, it is a better system than a carburetor. Did you test the EGR for an internal leak? Also, I would check the base gasket for the TBI, they had a habit of blowing out and causing a vacuum leak. I would not install anything aftermarket, it costs a bunch and it will not work well and will give you more problems down the road. Also, let's run the codes to see if any are stored.

https://www.2carpros.com/articles/buick-cadillac-chevy-gmc-oldsmobile-pontiac-gm-1983-1995-obd1-code-definitions-and-retrieval-method

If you switch to carb the transmission will not work right, and you will have a check engine light on and it will get bad fuel economy as well.
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Friday, June 13th, 2025 AT 11:19 AM

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