Engine cranks slowly after overhaul

Make sure battery has a full charge and battery connections all good. Does the starter motor crank the engine? If so, have a helper crank it while you check for spark at the plugs, if spark everywhere, check proper fuel pressure and fuel injector pulse.
Any applicable trouble codes?
I did look at your security system, it said passlock. Generally, passlock is fuel injector disable, only.
If the starter motor won't even crank the engine, have to check that system.

Make sure battery has a full charge and battery connections all good.
If it cranks good but won't start, have a helper crank it while you check for spark at the spark plugs, if spark everywhere, use a gage and check proper fuel pressure. Also check fuel injector pulse. Any applicable trouble codes?
If the starter motor won't even crank the engine? Two voltage circuits to starter motor, one comes from the battery, hot all the time. The other circuit goes hot with key in the start position and is probably wired through neutral switch for auto tranny. The starter motor grounds through engine block.

bad fuel, is it old? fuel.
needs tuneup, air cleaner and spark plugs , at least.
if the starter cranks fast and dont' start,
but does push started. that means the spark is weak
when cranking, and marginal spark plugs can do that.
this car is really (under Geo snake skins) a
an Isuzu Impulse
and Isuzu is defunct there too. (double bad)

now my real guess......analysis...
im not sure your order stated.
the engine would not crank over with a key before the new switch or after?
and "starters good", does that mean , it still fails to crank start with key
but the hot wiring of starter does?
try this:
tell use what happens when you turn the key, is best.
I turn the key, and i get the dash board to light up,
lots of lights. and the CEL LaMP GLOWS.
the CEL lamp, means the ENGINE brain is alive.
then you turn the key to cranks (start) position.

1. nothing happens.
2. it only clicks
3. it cranks slowly,
4. it cranks fast, just like a new car does. fast. cranking.

1,2,3,4.?

and does jumper cable starts work>?
if this works , your battery is low. , discharged or dead, or bad.
if the battery keeps going low, its bad, or the alternator fails to charge the battery, or you have phantom drains , discharging it as you sleep.

my guess, (based on most common)
is #3, slow cranks, and spark plugs are long since gone.(fouled and gaps no longer in spec>)

Won't crank? Problem is with starter-have it tested.
If it cranks and won't start, check for spark at one of the spark plug wires. If no spark when the engine is cranking, the ignition circuit is the problem.

Does the starter crank the engine over? If so, check for spark on a spark plug wire when cranking. If you have a strong blue spark, ignition is probably good. Check fuel pressure. Do you hear the fuel pump turn on for 2 seconds when turning key to on?

Hi,
If the engine cranks over normally when you attempt to start you car, but the engine does not start, the problem may be NO FUEL, NO SPARK or NO COMPRESSION. The engine needs adequate fuel pressure, a properly timed spark and normal compression to start.


1) To find why the engine won't start, remove the air inlet tube from the throttle body, push the throttle open and spray a small amount of aerosol starting fluid into the engine. Crank the engine. If it has spark and compression but NO FUEL, it will start and run a few seconds before dying. If it does NOT start, it probably has NO SPARK.

2)Another method to check for spark is to pull a spark plug wire off of a spark plug (if it has plug wires, coil-on-plug ignitions do not) and place the open end of the plug wire near a metal surface on the engine. Have a helper crank the engine while you watch for a spark. DO NOT hold the wire while doing this as it can shock you. If you see a spark, the problem is not spark, but most likely NO FUEL or NO COMPRESSION. If you do not see a spark, the problem is in the IGNITION CIRCUIT.

3)Proper fuel pressure is critical for fuel injected engines to start and run. You should hear the fuel pump inside the fuel tank buzz for a couple of seconds when the ignition is turned on (no buzz means the pump is not running and the engine is not getting fuel). You can smell the tailpipe for gasoline vapors after cranking the engine. If you smell gas, the problem is likely not fuel but NO SPARK. You can also remove the plastic cap and press the schraeder valve test fitting on the fuel rail to see if there is any fuel pressure to the engine (not a very accurate test because fuel pressure must be at a certain level for the engine to start, for that you need a gauge). Even so, no fuel at the fuel rail would tell you fuel is not getting to the engine..

Thank you !!

Check the starter relay.

if the starter is revving very slowly it is the battery, charge battery. if not, It can be three things happing. 1 no spark 2 no fuel 3 no crank signal or the car computer is bad- you will need to unplug one of the spark wires and remove the spark plug and put the spark plug in the spark plug wire boot, and touch the spark plug on any metal on the car and have some start the car. donot touch the spark plug itself and see if there is a spark. if spark is bright, then it is not spark plug and wires but if no or spark is not bright, check the spark plug wires by applying a little bit of water on the spark plug wire and take a 12v test light, connect the clap to ground and and have some one to crank the vehicle, touch allover the spark plug wires with the tip of the test light, if you see spark, replace the wires and change the plugs.. they are not good. if spark is present, check for fuel by removing any one of the spark plugs and see if it is wet. if wet fuel pump is ok but if not go look for the fuel pump fuse and relay. is fuse blown, replace, check the relay resistor with a volt meter. it should be around 40 to 80 ohm. if everything is good from this point check the fuel pump itself by disconnecting the connector to the pump and apply 12v and ground using jumper wires or some wires to the fuel pump if you donot hear the pump,replace pump. if you, the crank signal or computer may be the problem