TBI Throttle Body Injection discussion and questions. L03/CFI tech and other performance enhancements.

truck tbi

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Old Dec 6, 2016 | 07:45 AM
  #1  
Bobby Suth's Avatar
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Car: 1990 firebird,1989 Iroc z,1986 fire
Engine: 3.1lt,5.7tpi,3.1mpfi
Transmission: auto,auto
Axle/Gears: 273?277
truck tbi

I got a 305 TBI off a truck to put on my 89 rs. The tps is different. The connectors not the same. Can I get a connector and it work
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Old Dec 6, 2016 | 08:41 AM
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From: Chasing Electrons
Car: check
Engine: check
Transmission: check
Re: truck tbi

Yes, you can change the connector. SPR Performance also sells an adapter cable.

One thing to check before you swap that TBI, check that the arm and button is there to connect the TV cable. From my understanding the TBI units used with the E automatics don't have the TV connection.

RBob.
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Old Dec 6, 2016 | 05:58 PM
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From: tn.
Car: 1990 firebird,1989 Iroc z,1986 fire
Engine: 3.1lt,5.7tpi,3.1mpfi
Transmission: auto,auto
Axle/Gears: 273?277
Re: truck tbi

Going into a 5 speed rs. Are all 88 to 92 throttle body's the same? There not mad and ma's are they
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Old Dec 8, 2016 | 02:07 AM
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Re: truck tbi

Originally Posted by Bobby Suth
Are all 88 to 92 throttle body's the same?
No.
Originally Posted by Bobby Suth
There not mad and ma's are they
Huh????
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Old Dec 8, 2016 | 12:55 PM
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From: Modesto, California
Car: 88 Firebird Formula
Engine: LO5 5.7 TBI/Ebl Flash
Transmission: 700R4
Axle/Gears: 2.73 stock rear end
Re: truck tbi

Originally Posted by Bobby Suth
Going into a 5 speed rs. Are all 88 to 92 throttle body's the same? There not mad and ma's are they
No as stated above the main difference between the Throttle bodies is the Throttle cable/TV cable hook up and the TPS sensor. Ive also noticed some miss one of the front vacuum ports.
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Old Dec 8, 2016 | 02:51 PM
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Re: truck tbi

Originally Posted by Ghettobird52
No as stated above the main difference between the Throttle bodies is the Throttle cable/TV cable hook up and the TPS sensor. Ive also noticed some miss one of the front vacuum ports.
Vacuum nipples and throttle arms, as said. Also IAC passages, (which also changes the base gasket needed) and of course the obvious fuel injector GPH ratings to suit the different CID (2.8, 5.0, 5.7, 7.4) and expected use (consumer vs. Police, for example.) Most of the injectors are intended for 9--13 psi fuel pressure, and usable to maybe 20 psi, but some of the 454 injectors are intended for higher pressure--although I think that's post-'92. Then there's the throttle blade size difference between the 454 TBI vs. the other 2-barrels.

I don't know what year the sensor connectors changed. There's the older flat-3-pin for TPS vs. the new round 3-pin; and you've already seen the IAC connector difference.

I have some of this documented with photos. I can post 'em if anyone cares.

Even so, there isn't 1/10 the number of variations that there would be in the carburetor era.

Last edited by Schurkey; Dec 8, 2016 at 02:56 PM.
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Old Dec 10, 2016 | 10:45 PM
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From: tn.
Car: 1990 firebird,1989 Iroc z,1986 fire
Engine: 3.1lt,5.7tpi,3.1mpfi
Transmission: auto,auto
Axle/Gears: 273?277
Re: truck tbi

Sorry,that was suppose to have read,maf and mas, as with the tpi systems change from pre 1990 and after. These tablets change stuff I type in thinking I don't know what im doing
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