Question about Chevrolet Avalanche
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Posted on Jan 02, 2017
If I understand you right, the problem is at certain times the engine will not crank, that is turn over when you turn they ignition key to START. And at times it will start and run normally.
Might it be that the issue is with the starter system. The starter system is initiated at the ignition switch when the key is turned to start. At this point, the ignition switch then provides +12VDC to a starter relay. The relay is but a remote switch with slightly higher amperage capacity. The starter relay then engages and supplies +12VDC to the staring solenoid. The starting solenoid then performs two (2) functions. It provides the switching action (hundreds amps) from the battery heavy cable to the actual starter motor. The solenoid likewise pushes a small pinion gear along the shaft of the starter motor to engage the ring gear. The ring gear is of course on the edge of the flywheel which in turn is attached to the crankshaft.
Starter system problems could be corrected by:
1. check battery, battery cables and connections;
2. charge the battery if required;
3. clean brushes and guides of brush holders of the starter motor;
4. clean the commutator and commutator segments;
5. check/replace the armature or field coils if determined to be defective;
6. in some extreme cases it could be the drive pinion or the flywheel gear ring is defective.
7. often it is the big switch that the solenoid activates that looses contacts causing no +12V internally to the motor.
8. Most likely would be a defective starter relay or the IGN switch itself. Relative to this, you might try and check the connectors/terminals and electrical joints.
In the picture below, the upper portion is the starter solenoid while the one below it is the actual starter.
Given the amount of work to overhaul a starter, you might consider just replacing it.
This of course assuming that all other vital components of the car are working.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.
Good luck and kind regards.
Thank you for using FixYa.
Posted on Jun 09, 2008
ford courier workhorse ,great van ---right when engine is hot feel the hoses that run into the heater ,also it could be the heater core was leaking and someone has joined the hoses together .if the hoses are connected and they are hot then ,try removing them and then flushing the heater with a hose pipe
Posted on Nov 29, 2009
Testimonial: "not able to try solution yet, very wet outside. not sure how to flush the heater? thankyou anyway"
The radiator should be under pressure. If the cap for the overflow or radiator is worn, then this can cause it to overheat and the system will not have pressure. If the cap is off, the water should be seen flowing, thus letting your know the thermostat and water pump are working, but it doesn't mean they are working 100%.
Posted on May 09, 2010
SOURCE: 2002 ford courier 2.5 turbo
this is almost always due to too lean a mixture, and going overly lean for even 10 seconds will do this-check for vacuum leaks and fuel pressure, most usual reasons for this to happen.
Posted on Apr 21, 2011
Disconnect the negative battery cable.
Remove accessory drive belt.
Remove the timing belt cover.
Align the timing mark on the camshaft sprocket with the timing mark on the cylinder head.
Confirm that the timing mark on the crankshaft sprocket is aligned with the timing mark on the oil pump housing.
Loosen the belt tensioner attaching bolt.
Pry the tensioner away from the timing belt and tighten the attaching bolt.
Remove the spark plugs.
Remove the RH engine mount and raise the vehicle.
Remove the splash shield.
Remove the crankshaft damper.
Remove the timing belt.
Note: Do not mix 1/2 round and trapazoidal belt tooth profiles. This can cause premature belt wear, also the belt is meant to run in a dry environment. For maximum belt life, no oil or belt dressing compound should be applied to the timing belt.
Install the timing belt over the sprockets in a counterclockwise direction starting at the crankshaft. Keep the belt span from the crankshaft to the camshaft tight while installing over the remaining sprocket.
Loosen the belt tensioner attaching bolt, allowing the tensioner to snap against the belt.
CAUTION: Do not rotate crankshaft with the spark plugs installed .
Note: Do not turn the engine counterclockwise to line up the timing marks. After rotation, recheck camshaft timing marks for alignment. This will verify that the belt has not skipped a tooth during rotation.
Rotate the crankshaft clockwise two complete revolutions (720 degrees) stopping at top dead center. This will allow the tensioner spring to load the timing belt.
Tighten the belt tensioner attaching bolt to 23-30 Nm (17-22 lb-ft) .
Install the crankshaft damper.
Install the splash shield.
Lower the vehicle.
Install the RH engine mount.
Install the spark plugs.
Install the timing belt cover.
Install the accessory drive belt automatic tensioner.
Install the accessory drive belt.
Connect the negative battery cable.
Posted on Jun 13, 2012
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