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Dan
Dan, Technician
Category: Car
Satisfied Customers: 23591
Experience:  Independent Shop Experience, 2 Year Automotive Diploma, & Access to Information Database
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my car acts like it wants to turn over but it just wont do

Customer Question

my car acts like it wants to turn over but it just wont do it. And it was working just fine yesterday
Submitted: 7 years ago.
Category: Car
Expert:  Dan replied 7 years ago.
What model, make, year, and engine size of car? Was the car acting up before this happened?
Customer: replied 7 years ago.
Well it is a 2000 saturn sl i am not sure what engine size it is and it was not acting up at all before this happened i was driving it yesterday and it was great and then i went to go to work thismorning and it would not start it just tries to turn over and wont crank.
Customer: replied 7 years ago.
it is a 1.9 liter 4 cylinder
Customer: replied 7 years ago.
ok so they car is a 2000 saturn sl2 1.9 liter 4 cylinder everything on the car works accept when i try to start it, it just tries to start but wont fire
Expert:  Dan replied 7 years ago.

You need to check to see if the car is getting spark or fuel. Try to spray an alternative fuel into the throttle body to see if it starts so we know if its a fuel or spark problem.

Customer: replied 7 years ago.
ok so i did the fuel thing and it is sitll not working! so what else you got for me to try man?
Expert:  Dan replied 7 years ago.
Pull a plug and make sure your getting spark
Customer: replied 7 years ago.
my step dad already did that and he says that it is fine. that is why we are stumped on this
Expert:  Dan replied 7 years ago.

If you have a voltmeter you can backprobe the injectors and make sure they are firing. It takes 3 things for a engine to run....fuel, spark, and compression. You could do a compression test also then you would know you have spark and compression. But assuming you have both of those and it is a fuel problem, some things to check would be.

 

Possible Causes:

MAF

Fuel Pump

Clogged Fuel Filter

Fuel Pump Relay

Wiring

Crankshaft Position Sensor "but would cause no spark or injector pulse"

 

At the Mass Air Flow sensor (MAF) check for Battery Voltage (B+) at pin 2 Orange wire and a good ground at pin 3 Purple/White wire.


Disconnect the MAF sensor and check for 5 volts at pin 4 of the MAF connector Gray wire.

If there is less than 5 volts on the Gray wire, check the Gray wire for opens, shorts and/or high resistance.



Listen for the fuel pump to run when the ignition is turned on after having been off for 1 minute. It should come on for 2 seconds.
If it does not run, check for the fuel pump relay to click when the ignition is turned on after having been off for 1 minute. It should click.

 

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Test voltage backprobed at the relay control terminal from the Electronic Control Module (ECM) during the problem. The ECM should keep the circuit grounded until the engine stops and for 2 seconds after.

2. Test voltage backprobed at the ECM J2 (Rear) connector terminal 30 Light Green wire. Should be B+ when ECM commands relay off, 0 volts when ECM commands relay on.
3. Test voltage backprobed at the ECM J1 (front) connector terminal 62 Black/White wire ground during the problem. Test case ground.

 

You can also backprobe the crankshaft position sensor at the computer with a voltmeter to make sure the sensor is putting out voltage you would back probe the yellow wire which is in terminal 59 in the ecm connector and the purple wire which is in terminal 10 on the ecm.

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