2001 Chevrolet silverado crank no start

Posted by mellassi on March 15, 2014 under Domestic | Be the First to Comment

Crank no start :

diagnostic:

1- Check the Fuel Pressure when cranking, should be around 60 PSI. if no fuel pressure, possible fuel pump failure.

2-Check for good spark at a couple of plug wires when cranking.

in my truck, no spark at the wire, but there is spark coming out the ignition coil, the problem is in ignition cap and rotor.

 

 

cap and rotor

Mass Airflow (M A F) sensor for 1997 G M C Savanna 1500 5.7 L Trouble code P 0102 .

Posted by mellassi on under Domestic | Be the First to Comment


Code P0102 is for Mass Airflow sensor malfunction.

1- Check for power on the pink wire with the key on. if no power, check fuses or wire breakage.

2-check for ground on the black wire. if missing, possible ground wire broke at the harness, repair wire.

3- With the key on, and the MAF sensor unplugged, at the yellow wire, check for 5 volt reference from the Powertrain Control Module(PCM).

If both power and ground are present, replace the Mass Airflow Sensor.

In my case, power and ground are OK. On the yellow wire i had 0.7 v reference from the PCM.

I replace a used computer, problem fix.

when replacing the ECM, make sure to swap the Eprom located on the old ECM to the new one.

PCM GMC 1500 (mass airflow problems) pcm gmc 1500 (mass airflow problems)

1997 Nissan Maxima GXE 3.0L misfire code p1320

Posted by mellassi on February 28, 2014 under Imports | Be the First to Comment

The common cause of code p1320 (ignition control signal circuit malfunction) is the ignition coils.

If code p1320 is accompanied with codes p0301, p0302, p0303,p0304,p0305, 0r p0306, its defiantly the ignition coil for that specific cylinder.

Its recommended to replace the ignition coils with Original equipment ,  aftermarket coils may turn on code p1320.

also its recommended to use NGK spark plus on a Nissan engines.

 

1995 Dodge Ram 1500 5.2L no headlights

Posted by mellassi on February 8, 2014 under Domestic | 2 Comments to Read

Customer came in for no headlight operation, he already change 2 light bulbs.

check headlamps fuse, if ok pull the headlight switch out and check for battery voltage coming out on the light green wire in the head light position.

verify there is a battery voltage  present at the switch on the red/white wire.

headlight switch     IMG_0426


watch this YouTube video :

2008 Volkswagen passat 2.0T Engine makes a whistle noise

Posted by mellassi on January 21, 2014 under Imports | Be the First to Comment

Usually the whistle noise is due to large amount of a vacuum leak in the crankcase.

-There are 2 crankcase breather valves (PCV system) used on this engine. One is located on the valve cover of the engine and the other is located within the oil filter housing (intake manifold must be removed to replace oil filter housing). These valves control crankcase ventilation.

-If either the valve cover breather valve diaphragm or the oil filter housing breather valve fails, manifold vacuum can be introduced to the crankcase causing idle quality issues as well as various lean condition codes.

-Remove the dipstick and check for excessive crankcase vacuum (more than 1″ Hg). If excessive crankcase vacuum is present, block off the vacuum tube to the valve cover breather valve to eliminate the vacuum source. If crankcase vacuum is now normal, the valve cover breather valve is faulty and the breather must be replaced.

– If there is no change from blocking the valve cover vacuum source, locate the vacuum tube to the oil filter housing. Disconnect the tube at the housing and block off the vacuum from the intake manifold. If the crankcase vacuum is now normal, the oil filter housing must be replaced.

-In some cases a loud whining or moaning noise from the rear of the engine can be heard (has been described as a noise from the transmission as well). This is caused by the vacuum in the crankcase pulling air past the rear main seal. When the noise occurs, remove the oil fill cap and if the noise disappears, then either of the crankcase breather valves may be faulty and should be tested as described above.

a common problem with these car is the valve cover breather valve.

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2001 Volvo S40 1.9L does not start

Posted by mellassi on January 20, 2014 under Imports | Be the First to Comment

Engine will not crank over

1-check for any flushing lights in the instrument cluster, if yes, anti theft problem, you may try another key.

2-. Check fuse 11A/13 (for model year 2000 vehicles) or 11A/11 (for 2001 and newer models). If this is blown, check the wiring underneath the spark plug/ignition coil cover.

3-2. At the starter relay, check for power on terminal 3 at all times. Check for power on terminal 1 with the key in the crank position. If there is no power from the ignition switch, remove and attempt to turn with a small screwdriver. If it will crank, replace the steering wheel lock (tumbler assembly). If there is no power out of the ignition switch on terminal 4 (Green wire) with the switch in the crank position, replace the ignition switch.

4-Jump terminals 3 and 5. The engine should crank.

5- If the engine cranks, check for ground on terminal 2. Ground is supplied through the Gear Position Sensor (GPS) and the immobilizer.

6-If there is never a ground from the immobilizer control module, ensure key being used is programmed to the vehicle.try  another key; check trouble codes in the immobilizer.

 

2004 Nissan Armada 5.6 L cranks but won’t start

Posted by mellassi on January 18, 2014 under Imports | Be the First to Comment

We can’t get no communication with the scan tool, engine has no spark and no injector pulse.

1. With the key on check for power to the ignition coils on the White/Blue wire. If there is no power, check the operation of the engine control module main relay which is located in the engine room Intelligent Power Distribution Module (IPDM). This relay also powers up the engine control module.

2. If the coils have power, check for loss of signal from either the camshaft or crankshaft position sensor. Both should output square wave signals during cranking.

I switched the fog light relay with the main relay, engine starts. got new relay,  problem fixed.

1997 ford explorer 4.0L the horn does not work

Posted by mellassi on January 17, 2014 under Domestic | Be the First to Comment

First step is to check fuses in the power distribution box. If fuse is OK, check horn itself and see if it has good ground and power voltage when the horn is depressed. If power an ground are OK, replace the horn.

If ground is missing, fix ground wire, if power is missing check the horn relay and make sure it has ground on the Y/LG wire when the horn switch is depressed. If it does , check for 12v on the Dark Blue (DB) wire while the Y/LG is grounded. If there is no voltage, replace the horn relay.

If the Y/LG wire is not grounded when the horn switch is depressed, the problem is at the horn switch.

2002 Dodge Durango slt 4.7L speedometer does not work

Posted by mellassi on January 16, 2014 under Domestic | Be the First to Comment

Found trouble code P0500 using a scan tool.

1-Check the resistance of the rear speed sensor on the rear differential. It should be 1500-2500 ohms.

2- If OK, check the wiring harness for bad connectors and for opens and shorts.

replace speed sensor as necessary.

To do so, raise the vehicle on hoist, remove brake line mounting nut and remove the brake line from the sensor stud. then, remove mounting stud from the sensor and shield. Remove sensor and shield from differential housing, and then disconnect sensor wire

harness and remove sensor.

 

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to install it do the following:

1-Connect harness to sensor. Be sure seal is securely in place between sensor and wiring connector.

2-Install O-ring on sensor (if removed).

3-Insert sensor in differential housing.

4-Install sensor shield.

5-Install the sensor mounting stud and tighten to 24 N·m (200 in. lbs.).

6-Install the brake line on the sensor stud and install the nut.

7-Lower vehicle.

2002 Ford Expedition Xlt 5.4L Engine misfires, no power, stall sometimes.

Posted by mellassi on under Domestic | Be the First to Comment

Use a scan tool to isolate the cylinder that has a misfire, it could be more then one, then move the cylinder ignition coil to another cylinder, and check again . if the misfire follows, replace the coil. Also it is recommended to replace the spark plugs.

-If the misfire does not follow the coil, move the cylinder’s injector to another cylinder. If the misfire follow, replace that injector.

-If both coil and injector are OK, check power and ground while misfire to the coil and injector to that bad cylinder,if there’s no power or ground , check wire harness.

-If all coils, plugs, injectors, circuitry are proven OK, suspect internal engine fault, begin compression and running compression tests to isolate.