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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.

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)


NOTE: Please refer to Edelbrock Performer Series Carburetor Owner’s Manual for detailed tuning procedures. 1. Due to design, the fuel/air mixture and cylinder charging are very efficient with the CH-6B intake manifold. Generally speaking, the stock jetting for the recommended aftermarket carburetors will not need changing. Specific applications may show an increase in performance through further tuning. 2. Aftermarket distributor curve kits may be used with this intake manifold. 3. Use modified or high performance cylinder heads such as our Performer RPM. 4. The compression ratio should be at least 9.5 to 1 to work properly with Performer RPM camshafts. 5. Installation of aftermarket headers, camshafts or both may lean carburetor calibration. Should this occur, recalibrate with a richer jet INSTALLATION: 1. Use only recommended intake gaskets set when installing this intake manifold. 2. Fully clean the cylinder head intake flanges and the engine block end seal surfaces. 3. Use a factory style valley pan along with the recommended gaskets. 4. Apply Edelbrock Gasgacinch sealant P/N 9300 to both cylinder head flanges and to the cylinder head side of the gaskets, allow to air dry, and attach the intake gaskets. 5. Install the intake manifold and hold-down bolts. Torque all of the manifold bolts in two steps by the sequence shown in Figure 1 to 25 ft/lbs.

2003-2007 Dodge (DR/DH/D1/DC) Ram Truck Front EndShimmy On 4×4 Vehicles When Traveling Over Rough Surfaces In The Road

REPAIR PROCEDURE: 1. Raise the vehicle on an alignment rack (drive-on lift). 2. Verify the road tires are correctly sized and the tire tread is not excessively worn. Replace any worn tire before proceeding. Any new or old replacement tire should be equal to the original tires that came with the vehicle when it was new. Tire wear is not covered by the vehicle warranty. 3. Set the tire pressure for the FRONT TIRES to the following specification, regardless of the load being carried by the vehicle . Tire Size FRONT Tire Pressure LT235/80R17EorLT245/70R17E 448 Kpa (65 psi) LT265/70R17EorLT285/70R17E 414 Kpa (60 psi) 4. Set the tire pressure for the REAR TIRES as recommended for the vehicle configuration and load that is being carried at the time. Tire Size REAR Tire Pressure LT235/80R17EorLT245/70R17E Refer to the Tire Inflation Chart brochure in the Owners Manual or to the placards located either on the face of the driver’sdoor or on the driver’sside”B”pillar. LT265/70R17EorLT285/70R17E Refer to the Tire Inflation Chart brochure in the Owners Manual or to the placards located either on the face of the driver’sdoor or on the driver’sside”B”pillar. 5. Verify that the steering damper is operating correctly. a. Unbolt the end of the damper at the axle end. b. Cycle the damper rod by hand. c. There should be resistance to motion in both directions of the damper rod. d. Replace the damper if no resistance is present. 6. Verify both outer tie rod ends dustcovers are not worn. a. Attempt to rotate the dustcover by hand. b. If the dustcover on an outer tie rod end can be rotated, or is free and loose, then replace the tie rod (regardless of joint wear). 7. Inspect each outer tie rod end for internal wear. a. Maximum allowed wear (joint travel) fora tie rod end is 1.15 mm (0.045 in.). b. Install a dial indicator to the tie rod end (in-line with the vertical stud of the tie rod end). c. With a pry bar placed between the steering linkage and the axle tube, pry upwards while measuring the amount of joint travel (wear). d. Measure the amount of wear in the other outer tie rod end joint. e. If wear (joint travel) in either outer tie rod end is greater than 1.15 mm (0.045 in.), then replace the worn tie rod end. 8. Verify the torque on each outer tie rod end stud nut. The nut should be tightened to 122 Nm (90 ft. lbs.). 9. Make sure any worn outer tie rod ends have been replaced before proceeding further. 10. Verify all other steering linkage connections are tightened to their torque specifications.

2000 Pontiac Bonneville V6-3.8L VIN K – A/T 4T65E Harsh Shifts/Shudders/Slips Repair Manual

Line Pressure Check Procedure Tools Required Important: Before performing a line pressure check, verify that the pressure control (PC) solenoid valve is receiving the correct electrical signal from the PCM. Caution: Keep the brakes applied at all times in order to prevent unexpected vehicle motion. Personal injury may result it the vehicle moves unexpectedly. J 21867Universal Pressure Gauge Set 1. Install a Scan Tool. 2. Start the engine and set the parking brake. 3. Check for a stored Diagnostic Trouble Code (DTC). 4. Repair the vehicle, if necessary. 5. Check the fluid level. Refer to the Transmission Fluid Checking Procedure. 6. Check the manual linkage for proper adjustment. 7. Turn the engine OFF. Remove the oil pressure test hole plug and install the J 21867. 8. Put the gear selector in PARK range and set the parking brake. 9. Start the engine and allow the engine to warm up at idle Notice: Total test running time should not be longer than two minutes, or else transmission damage could occur. Notice: Refer to Fastener Notice in Cautions and Notices. Parts Information 10. Access the PC solenoid valve control test on the Scan Tool. Zoom Sized for Print 11. Increase the PC solenoid as shown actual current from 0.0 to 1.0 amps in 0.1 amp increments. Allow the pressure to stabilize for five seconds after each pressure change. Read the corresponding line pressure on the J 21867. 12. Refer to the Line Pressure specification table. Compare the data to the table. 13. If pressure readings differ greatly from the table, refer to Incorrect Line Pressure. 14. Remove the J 21867. 15. Apply sealant, P/N 12345382 (in Canada, P/N 10953489), to the oil pressure test hole plug. 16. Install the oil pressure test hole plug. Tighten Tighten the oil pressure test hole plug to 12 N.m (106 lb in).