car is not getting any spark. I have already changed the ignition control module.Car sounds like it might turn over but wont. I was told it could be the crankshaft position sensor
2007-05-04 06:26:58 · 5 answers · asked by Brandy R 1 in Cars & Transportation ➔ Car Makes ➔ Chevrolet
Check for power at the throttle position sensor.
2007-05-04 09:23:55 · answer #1 · answered by (A) 7 · 0⤊ 0⤋
Are you sure you are not getting any spark? You have to check all three coils to see if you have none at all of them. I will assume this is the case. Have you scanned the PCM to see if the data is valid? Have you checked the data for motor speed while cranking and if so, what does it indicate? If it indicates a motor speed while the motor is spinning, the ignition module is no good. If it indicates nothing while cranking and the motor is turning over, you need to do some further checking. Remove the power connector to the module and test for ignition power and ground supply to the module. If no power, there is most likely a fuse burnt. If there is no ground supply, trace back and fix or install another ground to it. If this is good, remove the three wire connection to the module which is the crank sensor input. Install an ohmmeter across the purple and yellow wires and inspect the meter. It should be indicating around a thousand ohms. If not exactly a thousand, don't be too concerned yet. Just so long as it is not an open circuit. If it is open, either the wiring is broken to the sensor, there is an open connection at the wiring harness to the crank sensor, or the sensor is open. If you have a resistance somewhere in the area that I stated, get your buddy to crank the motor while you keep the leads connected to the yellow and purple wires but with the meter on AC millivolts. There should be around 800-1000mV output when cranking. If there is no output while CRANKING, but there is a resistance indicated, you will need a new crank sensor. The crank sensor is located between the motor and the transmission area. It has a two wire connection to it and one 5/16 bolt holding it in. The other wire is a ground wire to shield the other wires from any EMI interferring with the signal. I hate to tell you this, but when removing the connector and bolt seem fairly difficult because of the lack of room you haven't seen anything yet. These sensors are only held in by the bolt, but there is an o-ring on the sensor to keep the oil from leaking out. These o-rings usually stick and make it extremely difficult to get the sensor out. One that is not stuck simply pops out. What usually happens is the sensor is so stuck from oil gum or from the sensor cracking that you have to dig it out or take the oil pan off to tap it out. Be sure to check the connections on all of these spring type connectors to be sure they are good. Good luck.
2007-05-04 11:29:07 · answer #2 · answered by Deano 7 · 0⤊ 0⤋
When the engine won't start, you can suspect a defective crankshaft position sensor or a defective top dead center sensor. They are both the same on most GM cars. Not expensive and easy to replace.
2007-05-04 06:57:54 · answer #3 · answered by Phillip S 6 · 1⤊ 0⤋
89 Beretta
2016-10-15 06:30:00 · answer #4 · answered by Anonymous · 0⤊ 0⤋
probably you misplaced spark or gas. you will could do a gas rigidity examine and purchase a ignition tester. The gas rigidity tester maximum motor vehicle areas shops lease them with a refundable deposit. they could print out "a thank you to" info or extra effective yet purchase a fix handbook.
2016-12-10 19:13:10 · answer #5 · answered by Anonymous · 0⤊ 0⤋