Factory Manual Contradiction: 1984 GM 2.8L E2S TPS Voltage .26 or .31 ???

Question

Factory Contradiction: 84 E2SE TPS Voltage .26 or .31 ???

This is in regards to a 1984 FBody VIN code '1' 2.8L V6 non-HO engine. Rochester E2SE Carb #17084632. This is an LC1 V6 107HP (it is NOT an LL1 125HP 2.8L V6). Partial vin is: 1G2AS8718ELxxxxxx

The 1984 Firebird Factory Service Manual (FSM) lists three(3) different TPS voltages! I've eliminated 0.255 volts as an option. But I can't find any clues about whether it's .26 volts per the adjustment text or .31 per the specification table - both from the same 6E section.

One ================== Section 6C3-30 "Carburetor Model E2SE" Lists: VIN Code B 2.8L 0.255 V VIN Code X 2.8L 0.310 V VIN Code Z 2.8L 0.255 V

(=-0.1 volts)

None of these VIN codes appear to match this Firebird - which tentatively eliminates .255 from the list of options.

Two ================== Section 6E1-113 "Driveability and Emissions - Carbureted"

Subsection: Throttle Position Sensor - E2SE Adjustment

Step #5 lists "0.26 volts" "=-0.05 volts"

Three ================== Section 6E1-183 "Driveability and Emissions - Carbureted"

TPS Adjustment Specification Table:

2.8L: 0.31 +-.1 Volts

Ashton Crusher · Accepted Answer

"Two" is telling you that IF you feel the need to adjust it that you should adjust it to 0.26 -+ 0.05 .

However, if you are just checking to see if it far enough out to need adjusting you have the range shown in "three" that's acceptable, 0.31

+-.1 Volts. That's a range of 0.21 up to 0.41, which covers ALL the engines listed in "one".

So the bottom line is that you have a fairly large range to shoot for that can be considered ok.

ben91932 · Answer

Is there a symptom you are trying to fix? It's been years, but I seem to remember jacking  the TPS up to .5 or so to overcome tip in hesitation on those things... HTH Ben

Factory Manual Contradiction: 1984 GM 2.8L E2S TPS Voltage .26 or .31 ???

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