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1993 Ford Crown Victoria V8-281 4.6L SOHC Engine – Lean Driveability Symptoms Manual

1. Look at the BARO PID. Refer to the Barometric Pressure Reference Chart in this article. At sea level, BARO should read about 159 Hz (29.91 in. Hg). As a reference, Denver, Colorado at 1524 meters (5000 ft.) altitude should be about 144 Hz (24.88 in.Hg). Normal learned BARO variability is up to +/- 6 Hz (+/- 2 in. Hg.). If BARO indicates a higher altitude than you are not at (7 or more Hz lower than expected), you may have MAF contamination. If available, Service Bay Diagnostic System (SBDS) has a Manifold Absolute Pressure (MAP) sensor that can be used as a barometric pressure reference. Use “MAP/BARO” test under “Powertrain,” “Testers and Meters.” Ignore the hookup screen. Connect GP2 to the reference MAP on the following screen. 2. On a fully warmed up engine, look at Long Term Fuel Trim at idle, in Neutral, A/C off, (LONGFT1 and/or LONGFT2 PIDs). If it is more negative than -12%, the fuel system has learned lean corrections which may be due to the MAF sensor over-estimating air flow at idle. Note that both Banks 1 and 2 will exhibit negative corrections for 2-bank system. If only one bank of a 2-bank system has negative corrections, the MAF sensor is probably not contaminated. 3. On a fully warmed up engine, look at MAF voltage at idle, in Neutral, A/C off (MAF V PID). If it’s 30% greater than the nominal MAF V voltage listed in the Powertrain Control/Emissions Diagnosis (PC/ED) Diagnostic Value Reference Charts for your vehicle, or greater than 1.1 volts as a rough guide, the MAF sensor is over-estimating air flow at idle. 4. If at least tow of the previous three steps are true, proceed to disconnect the MAF sensor connector. This puts the vehicle into Failure Mode and Effects Management (FMEM). In FMEM mode, air flow is inferred by using rpm and throttle position instead of reading the MAF sensor. (In addition, the BARO value is reset to a base/unlearned value.) If the lean driveability symptoms go away, the MAF sensor is probably contaminated and should be replaced. If the lean driveability symptoms do not go away, go to the PC/ED Service Manual for the appropriate diagnostics.


SERVICE PROCEDURE Replace Starter, Add Cleaner 1. Replace the starter motor. • Use the part number from the Parts Information section of this bulletin. • Refer to section SC, “STARTING SYSTEM, Removal and Installation” in the applicable Nissan Electronic Service Manual (ESM). 2. Add one full can of Nissan In-Tank Fuel System Cleaner to the fuel. NOTE: If the fuel tank is less than ¾ full, instruct the customer to fill the tank as soon as it is convenient after the repair. Driving with the Cleaner installed and low fuel level will not harm the fuel system or engine, but will reduce the effectiveness of the cleaning process. 3. Continue to ECM Part Number Check (next page). 1. With CONSULT-II “ON”, print the Self-DIAG Results as follows: START (Nissan) >> ENGINE >> Self-DIAG Results >> PRINT SELF-DIAG RESULTS SYSTEM ENGINE DATE XX/XX/XXXX* 11:07:11 P/N 23710-XXXXX TP020389h DTC RESULTS TIME NO DTC IS DETECTED Current ECM Part Number * Example, your screen may differ. 3. Using the printout from Step 1: • Compare the vehicle’s current ECM P/N to those shown under Current ECM P/N in Chart 1, below: • This comparison will allow you to determine if the ECM needs to be reprogrammed. Chart 1, Current ECM P/N’s: VEHICLE PACKAGE NATS? CURRENT ECM P/N A/T, ASCD YES 23710-9J305, -9J003, -9J002, -9J001, -9J000, -8J001, -8J000 M/T, ASCD YES 23710-9J315, -9J013, -9J012, -9J011, -9J010, -8J061, -8J060 A/T, no ASCD YES 23710-9J300, -9J008, -9J007, -9J006, -9J005, -8J011, -8J010 02-04 Altima M/T, no ASCD YES 23710-9J310, -9J018, -9J017, -9J016, -9J015, -8J071, -8J070 YES 23710-8U542, -8U541, -8U540, -8U041, 8U040 A/T NO 23710-8U502, -8U501, -8U500, -8U001, 8U000 YES 23710-8U562, -8U561, -8U560, -8U061, -8U060 02-03 Sentra 5 M/T NO 23710-8U512, -8U511, -8U510, -8U011, -8U010 YES 23710-8U072, -8U071, -8U070 02 Sentra 6 M/T NO 23710-8U022, -8U021, -8U020 YES 23710-8U572, -8U571, -8U570 03 Sentra 6 M/T NO 23710-8U522, -8U521, -8U520 NOTE: The 2004 Sentra ECM does not need to be reprogrammed for this bulletin. A. If your vehicle’s ECM P/N matches a P/N in the chart above: • Perform ECM Reprogramming (page 4). B. If your vehicle’s ECM P/N does not match a P/N in the chart above: • ECM Reprogramming is not necessary, bulletin complete / end here

1994 Chevy Truck C 1500 Truck 2WD Tune-up and Engine Performance Checks/ Ignition-Timing Connector Location Change Manual

SUBJECT: TIMING CONNECTOR LOCATION CHANGE MODELS: 1994 CHEVROLET AND GMC C/K TRUCKS WITH GASOLINE ENGINES The timing connector, which can be disconnected to return engine timing to base for adjustment purposes, has been moved from the engine compartment to inside the cab. This new location is not currently reflected in the Service or Owner’s Manual. The new location is under the dash directly below the glove compartment. The tan/black wire is routed for a short distance outside of a large wiring harness. This large harness is routed between the heater blower motor and evaporator case. The timing connector is taped to the wire bundle (Figure 1)

1992 Toyota Truck Pickup 2WD Cooling and Exhaust Engine Ignition Timing Adjustments Manual

1. Connect a tachometer test probe to terminal IG of the check connector, Fig. 211 2. NOTE: Never let the tachometer lead touch ground as this could cause damage to the igniter and/or coil. Be sure to check that your tachometer is compatible with this ignition system. Consult the operating manual for your instrument. Service Check Connector 3. Fig. 223 Ignition Timing (10) Check idle speed . 4. Idle Speed : 800 rpm Using a timing light, verify that the timing mark on the timing cover is aligned with the mark on the crankshaft pulley, Fig. 223 5. Ignition Timing: 10°BTDC at idle Tighten the distributor bolt and recheck the ignition timing. 6. Remove service wire. 7. Check idle advance timing with service wire removed. 8. Ignition Timing: 8°BTDC at idle Check idle speed and adjust if necessary, COMPUTERIZED ENGINE CONTROLS. 9. Disconnect tachometer and timing light from engine. 10. Timing Belt Removal Notes Fan Shroud Removal & Installation Remove radiator fan upper and lower shrouds. 1. Installing Power Steering Pump And Belt Remove power steering pump drive belt and pump. 2. Disconnect No. 2 and No. 3 air hoses from air pipe. 3. 4. Fan Removal Remove alternator drive belt , cooling fan, belt guide and fan pulley. 5. Remove No. 2 timing belt cover. 6. Fig. 6 Aligning Timing Marks Place No. 1 cylinder at TDC of compression stroke by turning the crankshaft pulley and aligning pulley groove with the “0” mark on the No. 1 timing belt cover. Ensure alignment marks on the camshaft timing sprockets and the No. 3 timing belt cover are correctly aligned, Fig. 6. 7. If not, turn the crankshaft pulley one complete revolution. 8. Crankshaft Pulley Removal


ENGINE 7.3L DIESEL DI HIGH PRESSURE OIL PUMP LEAK ACTION sensor electrical connector. High pressure oil pump leaks at the outlet fittings b. Remove the exhaust back pressure sensor. and/or end plug can be serviced without removing the pump assembly. Replace the O-rings on the 3. Remove the high pressure oil pump reservoir. fittings and the end plug using Kit 2C3Z-9G804-AA. For additional information, refer to Section All three (3) O-rings should be replaced. Apply 303-04 in the appropriate Workshop Manual. liquid thread sealer (included in the kit) prior to WARNING reinstallation. Refer to the following Service Procedure for details. SMOKING OR OPEN FLAME OF ANY TYPE MUST NOT BE PRESENT WHEN WORKING SERVICE PROCEDURE NEAR FUEL VAPOR. NOTE CAUTION BEFORE PERFORMING THE REPAIR THE FUEL SYSTEM CONTAINS PRESSURIZED PROCEDURE, MAKE SURE THAT THE CAUSE FUEL AFTER THE VEHICLE IS SHUT DOWN OF THE LEAK IS CLEARLY ESTABLISHED. AND WILL MAINTAIN THIS PRESSURE FOR A LONG PERIOD OF TIME. NOTE FOR E-SERIES AND F650/750 VEHICLES, 4. Open the fuel/water separator drain valve to FOLLOW THE PROPER HIGH PRESSURE OIL release fuel pressure. Completely drain the fuel PUMP ACCESS PROCEDURE IN THIS filter/water separator assembly. DOCUMENT FOR ACCESS TO THE HIGH 5. Disconnect the fuel supply and fuel return lines PRESSURE OIL PUMP. from the fuel filter/water separator. NOTE 6. Disconnect the two (2) cylinder head fuel FOR SUPER DUTY AND EXCURSION, PROCEED supply lines from the fuel filter/water separator