High Idle
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Freshman User
Joined: Feb 2003
Posts: 36
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High Idle
I drive a 92 F-150 Flareside 302 EFI
when i am in neutral or the clutch is in the engine idles up to 3000 rpm.
I searched the forum and learned to clean the IAC. Having done this and it not repairing my problem i turn to posting my own thread. Sorry for posting what may have already been asked but It's sometimes just as annoying to bring back a dead thread.
My IAC wasn't that dirty and moved freely. What whould i check now?
when i am in neutral or the clutch is in the engine idles up to 3000 rpm.
I searched the forum and learned to clean the IAC. Having done this and it not repairing my problem i turn to posting my own thread. Sorry for posting what may have already been asked but It's sometimes just as annoying to bring back a dead thread.
My IAC wasn't that dirty and moved freely. What whould i check now?
Lead Driver
Joined: Feb 2003
Posts: 8,140
Likes: 4
From: Oak Harbor, OH
Check the TPS Voltage. There are three wires, a red or orange (5v+), a black (ground), and a green (signal reference). Probe the green, and black wires. DO NOT TOUCH THE LEADS TO THESE TOGETHER. Red wire from meter to the green, black to black, at idle you should have .9v+ at idle, and ~5v+ at WOT.
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Freshman User
Joined: Feb 2003
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heh heh heh...checkin the chiltons i found where the TPS is... ahem..*sheepish grin* would turning the small pin that sticks out and hits the linkage on the throttle effect my rpm problem??... i may have turned it not knowing what i was doing (stupid) How do i go about resetting it's position. My friend in highschool is gonna take my truck to his Auto class.. should i just wait and fix it there or is it pretty easy to set?
Freshman User
Joined: Feb 2004
Posts: 37
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From: UNION, NJ
HI YOU NEED TO SET BASE IDLE SPEED
Procedures;
1. With engine OFF install specific feeler gauge between throttle plate stop screw and throttle lever. Automatic transmission .050 inches, manual transmission .030 inches
2. Unplug SPOUT line and verify that ignition timing is 10º +/- 2º BTDC.
3. Disconnect idle speed control-air bypass solenoid.
4. With transmission in Neutral (M/T) pr PARK (A/T):
Allow engine to idle for 2 minutes.
5. Check/adjust idle rpm:
Turn the throttle plate stop screw to 675 +25 rpm automatic tranmission, 700 +25 manual transmission.
NOTE: If you must turn the throttle stop screw IN, turn engine OFF, make estimated adjustment. START engine and repeat Steps 4, 5, and 6 before continuing.
6. Shut engine OFF and disconnect battery for a minimum of 5 minutes.
7. Remove feeler gauge from throttle plate stop screw and throttle lever pad.
8. Reconnect spout line.
9. Turn engine OFF and reconnect idle speed control-air bypass solenoid, verify the throttle is not stuck in the bore and linkage not preventing throttle from closing.
10. START engine and stabilize for 2 minutes then goose engine and let it return to idle, lightly depress and release the accelerator. Let engine idle, if problem exists, see "Diagnosis by Symptom (Diagnostic Routines.)
NOTE: A condition may occur where the engine rpm will oscillate. This can be caused by the throttle plates being open enough to allow purge flow. To verify this condition, disconnect the carbon canister purge line & plug it. If purge is present, the throttle plates must be closed until the purge flow induced idle oscillations stop.
11. On automatic Overdrive transmission (AOD) applications check TV pressure adjustments, See Automatic Transmissions.
P.S. i own a 1990 f-250 xlt lariat rc. w/ 5.0, 5spd, 4x4
Procedures;
1. With engine OFF install specific feeler gauge between throttle plate stop screw and throttle lever. Automatic transmission .050 inches, manual transmission .030 inches
2. Unplug SPOUT line and verify that ignition timing is 10º +/- 2º BTDC.
3. Disconnect idle speed control-air bypass solenoid.
4. With transmission in Neutral (M/T) pr PARK (A/T):
Allow engine to idle for 2 minutes.
5. Check/adjust idle rpm:
Turn the throttle plate stop screw to 675 +25 rpm automatic tranmission, 700 +25 manual transmission.
NOTE: If you must turn the throttle stop screw IN, turn engine OFF, make estimated adjustment. START engine and repeat Steps 4, 5, and 6 before continuing.
6. Shut engine OFF and disconnect battery for a minimum of 5 minutes.
7. Remove feeler gauge from throttle plate stop screw and throttle lever pad.
8. Reconnect spout line.
9. Turn engine OFF and reconnect idle speed control-air bypass solenoid, verify the throttle is not stuck in the bore and linkage not preventing throttle from closing.
10. START engine and stabilize for 2 minutes then goose engine and let it return to idle, lightly depress and release the accelerator. Let engine idle, if problem exists, see "Diagnosis by Symptom (Diagnostic Routines.)
NOTE: A condition may occur where the engine rpm will oscillate. This can be caused by the throttle plates being open enough to allow purge flow. To verify this condition, disconnect the carbon canister purge line & plug it. If purge is present, the throttle plates must be closed until the purge flow induced idle oscillations stop.
11. On automatic Overdrive transmission (AOD) applications check TV pressure adjustments, See Automatic Transmissions.
P.S. i own a 1990 f-250 xlt lariat rc. w/ 5.0, 5spd, 4x4
