# 1992 GMC Sonoma 2WD

**URL:** <https://community.cartalk.com/t/1992-gmc-sonoma-2wd/33632>\
**Category:** General Discussion\
**Created:** [July 19, 2009, 5:27am UTC](https://community.cartalk.com/t/1992-gmc-sonoma-2wd/33632 "2009-07-19T05:27:58Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![mmohamoud](https://avatars.discourse-cdn.com/v4/letter/m/b5a626/32.png) [@mmohamoud](https://community.cartalk.com/u/mmohamoud)\
**Post date:** [July 19, 2009, 5:27am UTC](https://community.cartalk.com/t/1992-gmc-sonoma-2wd/33632/1 "2009-07-19T05:27:58Z")

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I have a 1992 GMC Sonoma pick-up truck 2Wd rear drive with 6 cylinder 4.3L engine.My question is how to find out whether this engine is single port fuel injected(SPFI) or multiport fuel injected(MPFI).Don’t have Vehicle manual.

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**Author:** ![oldschool](https://avatars.discourse-cdn.com/v4/letter/o/e19adc/32.png) [@oldschool](https://community.cartalk.com/u/oldschool)\
**Post date:** [July 19, 2009, 6:19am UTC](https://community.cartalk.com/t/1992-gmc-sonoma-2wd/33632/2 "2009-07-19T06:19:52Z")

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Your 92 Sonoma probably uses TBI (Throttle Body Injection) the main part looks like a carburetor and contains 2 fuel injectors.

The S in SPFI stands for sequencial fuel injection (lose the “P”)

There is a designation called “grouped single-fire port injection” and its class designation is MPI (Multiport injection)

Then there is the famous CPI or CMFI (central multiport fuel injection)which uses 1 injector and 6 poppet valves,perhaps this is what you are thinking of.

There is no system that I would call single port fuel injection. I guess a one cylinder fuel injected engine would qualify.