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Old 04-17-2023, 10:43 PM   #1
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Renton , Washington
Join Date: Jun 2021
Posts: 34
TBI Min idle speed spec info

Looking at the 1994 service manual for 454 TBI under fuel systems (Section 4-4A) the 'Min idle speed' setting is... (Factory set screw) not recommended to adjust.

For the 7,4L auto trans in Drive is 625 (+-25rpm) Closed loop

Controlled Idle Speed is as follows:

454 7.4L in Drive 675 (+- 25rpm) IAC count 5-30 (Closed loop) at operating temp 196-222F (add 2 counts for every 1000ft above sea level

The 'controlled idle speed' is obtained by the control module positioning the IAC valve. A high/low coolant temp or AC clutch engagement may signal the control module to change the IAC counts.

IAC counts will be above 60 if idle is too low and zero counts if idle is too high. Things to check if so...

1. Vacuum leak/s

2. System too rich

3. TB obstruction

4. PCV issue

5. AC issue
__________________
1994 Fleetwood Southwind Storm 28ft
VIN#1GBJP37N4R3314754 (454 7.4L TBI w/4L80E)
1972 VW Westy hardtop-2056cc Type-4 Massive
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