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88hurstolds
10-11-2016, 12:56 PM
QUAD R-4 COMP Rochester E4MC Carburetor:
Carburetor No.
Engine VIN# Year Inj. (Orig. Equip.) TPS Voltage
______ ____ ____ ____ _____________ ___________

5.0L Y 1981 N/A
17081253 .46 (A)
17081254 .46 (A)

5.0L Y 1982 N/A
17082253 .46 (A)
17082255 .46 (A)

5.0L Y 1983 N/A
17083250 .46 (C)
17083251 .46 (C)
17083252 .46 (C)
17083253 .46 (C)

5.0L 9
17083553 .46 (B)

5.0L Y 1984 N/A
17084252 .46 (C)
17084254 .46 (C)
17084256 .46 (C)
17084258 .46 (C)

5.0L 9
17084554 .46 (B)

5.0L Y 1985 N/A
17085282 .41 (C)

5.0L 9
17085554 .41 (B)

5.0L Y 1986 N/A
17086008 .41 (C)

5.0L 9
17086009 .41 (B)

5.0L Y 1986 N/A
17086077 .41 (C)


Notes:
A=Stopped at curb idle.
B=ISC retracted at slow idle.
C=ILC retracted.

88hurstolds
10-08-2018, 09:58 AM
TPS setting: approx. Between 0.41 [VIN Y] at min idle, (ISC retracted, A/C OFF), and 5.0 volts at WOT (<1 volt at idle, typically between 0.4-0.5 volts for Olds G-body 4 bbl). [VIN 9 is .046 @550 idle, A/C off]

1. Drill a 5/64" (0.078") hole about 1/16" to 1/8" deep in the aluminum plug covering the TPS adjustment screw. Be careful not to damage the adjustment screw.

2. Start a No. 8-1/2" long self-tapping screw into the plug enough to ensure good thread engagement.

3. Pry the plug out with a wide-blade screwdriver. Discard the plug.

4. Unplug the electrical connector at the TPS, then connect jumper wires between the three terminals of the connector and TPS.

5. Connect a digital voltmeter across the center and lower terminals: terminal "B" and terminal "C". Only a digital voltmeter with 10 megohm input impedance or higher can be used. Conventional voltmeters do not have sufficient resistance to obtain accurate readings.

6. With ignition switch (http://shop.ebay.com/?_from=R40&_trksid=p5197.m570.l1313&_nkw=ignition switch) ON, engine and A/C OFF, turn the TPS screw with tool j-28696 or BT 7967-A (or equivalent) to obtain the voltage specified in the carburetor (http://shop.ebay.com/i.html?_nkw=carburetor) charts. (Speical tool made for TPS hex headed adjustment screws) I think the hex driver tool size is 2.5 mm hex.

7. Turn off ignition. Remove jumper wires and voltmeter, and reconnect the TPS connector.

8. Install new tamper-resistant plug, until flush with boss. If not available, use silicon RTV sealant or equivalent.