Filed Under (GM) by admin on 11-04-2011
Description The Engine Cranks but Does Not Run diagnostic table assumes that the battery condition and the engine cranking speed are OK. If the battery condition and the cranking speed are not OK, refer to Diagnostic System Check – Engine Electrical in Engine Electrical for diagnosis. Make sure that there is adequate fuel in the fuel tanks. Diagnostic Aids • Check the duct work between the mass air flow (MAF) sensor and the throttle body for air leaks. • A malfunctioning MAF sensor may cause a no start or a stall after start. If you suspect this, disconnect the MAF sensor. The powertrain control module (PCM) will default to the speed density in order to calculate the load and the air flow. If this corrects the condition and the connections are OK, replace the MAF sensor. If the steps above check OK, refer to Symptoms . Test Description The numbers below refer to the step numbers on the diagnostic table. 4. It may be necessary to connect a battery charger to the battery for this step. If the battery state of charge is low, the scan tool may reset during the cranking test. 5. This step tests the ignition relay for proper operation. The ignition relay supplies voltage to the injectors and the ignition coils. When the ignition relay is not operating properly, a no start condition occurs. If the test lamp does not illuminate, this indicates the ignition relay is not suppling a voltage to the fuses. 6. The crankshaft position (CKP) sensor is located above the starter. 7. The camshaft position (CMP) sensor is located at the rear of the engine behind the intake manifold. 8. The ignition feed circuit for the CMP and CKP sensors is internally connected within the PCM. A short to ground on either circuit will cause a no start condition. 10. The fuel cap may need to be removed in order to hear if the fuel pump is operating. 12. At this point the engine should start. Refer to Hard Start for further diagnosis.
Filed Under (Daewoo) by admin on 05-04-2011
Removal 1. Disconnect negative battery cable. Disconnect intake air temperature sensor connector from intake air duct. Disconnect the air intake tube from the throttle body. Disconnect the breather tube from the valve cover. Remove the air filter housing. 2. Raise and support the vehicle. Remove right front wheel. Remove right front splash shield from wheelwell. Remove serpentine accessory drive belt. 3. Remove crankshaft pulley bolts. It is NOT necessary to remove crankshaft sprocket center bolt. Remove crankshaft pulley. Lower vehicle. 4. Support engine assembly from above with Support Fixture (J-28467-B). See Fig. 1 . Remove engine mount bracket from timing belt end of engine. See Fig. 2 . 5. Remove front timing belt cover. Using crankshaft center bolt, rotate crankshaft one full turn clockwise (as viewed from timing belt end of engine). 6. Align mark on crankshaft sprocket with notch at bottom of rear timing belt cover. See Fig. 3 . Align camshaft sprocket timing marks with notches on valve cover. See Fig. 4 . CAUTION: Engine damage could result if camshaft sprockets are not properly aligned with notches on valve cover. 7. Loosen the automatic tensioner bolt. Use an Allen wrench to rotate tensioner and relieve tension on timing belt. See Fig. 5 . Remove timing belt. Installation 1. Ensure crankshaft and camshaft timing timing marks are still aligned. Install the timing belt. See Fig. 6 . Turn the timing belt tensioner clockwise to tension the timing belt. Turn tensioner until the pointer aligns with the notch on the rear timing belt cover. Tighten automatic tensioner bolt. See TORQUE SPECIFICATIONS . 2. Using crankshaft center bolt, turn crankshaft clockwise (as viewed from timing belt end of engine) 2 full revolutions. Ensure timing belt tensioner pointer is still aligned with notch. 3. If timing belt tensioner is correctly aligned, install timing belt cover. Install the engine mount bracket on the timing belt end of engine. Install crankshaft pulley. Install serpentine accessory drive belt. Install right front splash shield. Install right front wheel. 4. Install air filter housing. Connect air intake temperature sensor connector. Connect negative battery cable.
Filed Under (Chevrolet) by admin on 18-03-2011
WARNING: Begin fuel system trouble shooting and diagnosis with fuel system pressure test. Relieve fuel system pressure before disconnecting any components or installing fuel pressure gauge. TBI 1. Turn ignition off for 10 seconds. Turn ignition on, and listen at fuel tank for fuel pump operation. Pump should run 2 seconds (20 seconds on models with fuel module). If fuel pump runs, go to next step. If fuel pump does not run, go to step 7). 2. If fuel pump runs, turn ignition off. Verify fuel tank has fuel. Relieve fuel pressure. See FUEL SYSTEM PRESSURE RELIEF . Remove air cleaner, and plug air cleaner vacuum ports (if equipped). Disconnect fuel line between throttle body and fuel filter. Install Fuel Pressure Gauge (J-29658A) and Adapter (J- 2968A-85) between steel fuel line and flexible hose, ahead of in-line fuel filter. 3. Turn ignition on, and note reading on pressure gauge. If fuel pressure is 9-13 psi (.63-.91 kg/cm2 ), no problems exist. If pressure is less than 9 psi (.63 kg/cm2 ), go to step 5). If pressure is greater than 13 psi (.91 kg/cm2 ), turn ignition off, and bleed fuel pressure. Disconnect fuel return line downstream of pressure gauge. Insert return line into a gasoline container. 4. Turn ignition on. If pressure is now 9-13 psi (.63-.91 kg/cm2 ), correct restriction in fuel return line between disconnected point and fuel tank. If fuel pressure is greater than 13 psi (.91 kg/cm2 ), check for restricted return line (including fuel filter) downstream of pressure gauge. If no restrictions are present, replace fuel pressure regulator (TBI 700) or fuel meter cover/pressure regulator (TBI 220). 5. Check for restricted line between in-tank fuel pump and pressure regulator. If fuel line is okay, disconnect injector connector. Turn ignition on. Gradually pinch fuel pressure gauge outlet hose. Note pressure. CAUTION: DO NOT pinch off fuel return line completely. DO NOT allow fuel pressure build-up to exceed specification, as damage to fuel pressure regulator may occur. 6. If pressure is greater than 13 psi (.91 kg/cm2 ), replace fuel pressure regulator (TBI 700) or fuel meter cover/pressure regulator (TBI 220). If pressure is less than 9 psi (.63 kg/cm2 ), check for faulty fuel pump or incorrect part. Check fuel pump coupling hose and pump inlet filter in fuel tank. On models with dual fuel tanks, check for faulty fuel tank selector valve and meter switch.
Filed Under (Honda) by admin on 17-03-2011
SYMPTOM When the engine is first started after the vehicle has sat overnight, customers may “feel” the release of the throttle plate through the accelerator pedal. Some describe it as a one-time “pop” sensation. Customers may have trouble explaining this phenomenon because: They can’t repeat it because it only happens one time, when the engine is cold. The accelerator pedal works normally at all other times. There are no other symptoms. It may be intermittent, happening only during cooler weather. PROBABLE CAUSE The symptom is caused by normal buildup of contaminants in the throttle bore, combined with expansion and contraction of the throttle body. CORRECTIVE ACTION Partially remove the throttle body, and clean it with Honda carburetor cleaner or throttle plate and induction cleaner. REPAIR PROCEDURE 1. Remove the breather tube from the air intake duct, unclip the vacuum lines from the duct, and remove the duct from the throttle body. See Fig. 1 . Fig. 1: Removing Air Intake Duct 2. Disconnect the TPS and MAP connectors from the throttle body. 3. Remove the throttle cable and, if equipped, the cruise control actuator cable from the throttle body. 4. Remove the throttle body mounting nuts and bolts, then slide the throttle body off its studs on the intake manifold chamber. Leave the coolant hoses connected. See Fig. 2 . 5. Put a shop towel under the throttle body, open the throttle, then clean out any contaminants from the intake manifold side of the throttle body with carburetor cleaner or throttle plate and induction cleaner. See Fig. 3 . NOTE: To avoid damaging the idle air control valve (IACV), spray the cleaner through the back of the throttle body, not the front.
Filed Under (Mazda) by admin on 28-02-2011
Removal of Factory Intake 1. 2. Pull upwards to remove the engine cover. Unclip the battery cover and remove, then disconnect the negative battery cable. Disengage the plastic rivet. Slide the battery cold air vent backwards and remove from the engine compartment. Disconnect the mass air sensor electrical connection. Depress the retaining clip and disconnect the rank case vent hose from the stock intake tube. Remove the switch/sensor from the air cleaner cover. Loosen the clamp at the throttle body. Unclip the coolant hose from the air cleaner cover. Unclip the air cleaner cover and remove the complete upper air cleaner assembly. Remove the rubber retainer from the core support. Remove the lower air cleaner assembly. Unclip the wire harness from the side of the battery box. Remove the mass air sensor from the air cleaner cover. Remove the plastic clip from the crank case vent on the stock intake tube. Slide the clamps off rubber rank case vent. Remove the plastic vent from the stock intake tube. Slide the plastic clip from before back onto the crank case vent. Raise the vehicle up and support by jack stands, then remove the left front tire. Remove the four bolts and one plastic rivet from the inner valance, then remove the valance. Remove the three plastic rivets and six hex bolts on the inner valance, then pull the inner valance downward. Remove the three bolts that secure the air intake resonator to the inner fender, then remove the resonator. Secure the rubber mounted stud to the hole on the battery tray. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. Install of Intake 24. Install reducer and clamps onto the throttle body. 25. Install the hose onto the vent on the intake tube. 26. Install the mass air sensor into the intake tube. 27. Slide the tube into the reducer and line up the bracket with stud, then tighten the clamps at the throttle body. 28. 29. 30. 31. 32. 33. 34. 35. 36. 37. 38. 39. 40. Secure the switch to the bracket (not for the 06 Mazda 5 model). Install the crank case vent into the hose on the intake tube. Reconnect the crank case vent. Install the rubber mounting stud into the resonator threaded hole. Install the reducer and clamps onto the cold air tube. From underneath the vehicle install the cold air tube. Slide the cold air tube onto the short ram tube. Secure the bracket to the tuber mounted stud. Install the filter onto the cold air tube from the underneath vehicle. Reconnect the mass air sensor. Reverse the removal process and reinstall the inner fender valance. Reinstall the front tire and torque to factory specs. Slide the vent into the core support and line up the other end with the battery box and secure with plastic rivet. 41. Reconnect the negative battery cable, then reinstall the battery cover. 42. Reinstall the engine cover. Resetting the ECU This is to be completed at your own risk. This procedure will reset the computer so that it may “learn” of your new intake. We are not to be held liable for any mishaps that you may occur while completing this process. • • Disconnect the Negative battery cable for 5 minutes. Reconnect the battery cable and false panel cover.