replaced fuel pump. no power to it. checked plug end to pump, no power.

Crank sensor is for spark, cam is for fuel timing. Fuel pump is bad fuse/relay or pump. Year make and model?

SOLVED: Will a bad crankshaft position sensor cause the - Cars & Trucks

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Turns over but wont fire 99 Saturn SL

If your 1999 Saturn SL turns over but won't start, there could be a few different reasons why. Here are some possible causes:

Faulty fuel pump: The fuel pump is responsible for delivering fuel from the tank to the engine. If it's not working properly, the engine won't receive enough fuel to start. You can check if the fuel pump is working by turning the key to the "on" position and listening for a humming sound coming from the fuel tank. If you don't hear anything, the fuel pump may be faulty.

Dead battery: If the battery is dead, the engine won't have enough power to start. You can try jump-starting the car to see if that helps.

Ignition system problems: If the ignition system isn't working properly, the engine won't start. This could be caused by a faulty ignition coil, distributor, or spark plugs.

Clogged fuel filter: If the fuel filter is clogged, fuel won't be able to flow properly to the engine. This can cause the engine to stall or not start at all.

Bad crankshaft position sensor: The crankshaft position sensor tells the engine control module (ECM) when to fire the spark plugs. If it's not working properly, the engine won't start.

These are just a few possible causes of a Saturn SL that turns over but won't start. It's best to have a qualified mechanic diagnose the problem to ensure that it's fixed correctly.

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Mar 20, 2023 • Saturn Cars & Trucks

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Car wont start

Either you are not getting spark or not getting fuel. A bad crankshaft position sensor would cause no spark at all. You can pull one spark plug, place it back on the plug wire. Lay the plug electrode next to a metal surface. Have someone else crank over the engine while you observe for spark. You should see a spark jump from plug to the metal surface. (plug electrode should be no more than 1/4" away) If you don't have spark, put the plug back in and move on to the next plug and try that one. (the correct way is to use a spark tester) If you have no spark in any plug, you may want to test the crankshaft position sensor with an ohmmeter. You can also use a meter to test power at the ignition module.
If you find that you do have spark in every plug, then it's possible that you don't have fuel. There is a fuel pressure test port on the fuel rail. There is a cap and a valve. With the key in ON position ,you can place rag over the test port, press in on the valve and there should be fuel that comes out meaning there is fuel pressure. (the correct way is to use a fuel pressure gauge if you have one)
If you find there is no fuel pressure, turn the key off and back on again. You should hear the fuel pump. If you can hear the fuel pump, then it is working. That means you may have a plugged fuel filter or faulty fuel pressure regulator. If you do not have hear the fuel pump, check the fuse and fuel pump relay. You can test the relay and a fuse with an ohmmeter on the ohm setting. You can also use a voltmeter and check power to the relay and also to the fuel pump to test for 12 volts. If you have power to the pump but the pump is not running, it is likely faulty. If you don't have power to the pump, then either the relay or fuse is bad. If they test out ok, then test power from ECM.

These are the most common causes of a no start. If you have any bad sensors of any sort, it would likely set of the check engine light. Then the computer should be tested for engine codes which can be done with a scan-tool.

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on Jun 18, 2010 • Chevrolet 2500 Cars & Trucks

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Engine will not start

Either you are not getting spark or not getting fuel. A bad crankshaft position sensor would cause no spark at all. You can pull one spark plug, place it back on the plug wire. Lay the plug electrode next to a metal surface. Have someone else crank over the engine while you observe for spark. You should see a spark jump from plug to the metal surface. (plug electrode should be no more than 1/4" away) If you don't have spark, put the plug back in and move on to the next plug and try that one. (the correct way is to use a spark tester) If you have no spark in any plug, you may want to test the crankshaft position sensor with an ohmmeter. You can also use a meter to test power at the ignition module.
If you find that you do have spark in every plug, then it's possible that you don't have fuel. There is a fuel pressure test port on the fuel rail. There is a cap and a valve. With the key in ON position ,you can place rag over the test port, press in on the valve and there should be fuel that comes out meaning there is fuel pressure. (the correct way is to use a fuel pressure gauge if you have one)
If you find there is no fuel pressure, turn the key off and back on again. You should hear the fuel pump. If you can hear the fuel pump, then it is working. That means you may have a plugged fuel filter or faulty fuel pressure regulator. If you do not have hear the fuel pump, check the fuse and fuel pump relay. You can test the relay and a fuse with an ohmmeter on the ohm setting. You can also use a voltmeter and check power to the relay and also to the fuel pump to test for 12 volts. If you have power to the pump but the pump is not running, it is likely faulty. If you don't have power to the pump, then either the relay or fuse is bad. If they test out ok, then test power from ECM.

These are the most common causes of a no start. If you have any bad sensors of any sort, it would likely set of the check engine light. Then the computer should be tested for engine codes which can be done with a scan-tool.

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on Jun 18, 2010 • Chevrolet 1500 Cars & Trucks

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No spark to front plug have replaced coil already no fuel pump either

Check for power on the positive side of coil, if you don't check ignition fuse, if you do then check for a trigger signal on the negative side of coil while cranking, if you have a trigger signal then the coil is bad, if no trigger signal then you either have a bad ignition module and or a distributor stator that you just replaced or a wiring problem.

If there's a spark when the engine is cranked, it has ignition. The problem is either fuel or compression. ... Use your AutoTap Express DIY to look for an RPM signal from the Crankshaft Position sensor while cranking the engine. A bad Crankshaft Position sensor is a common cause of no starts.
http://www.autotap.com/problem5_engine_cranks.asp

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Jan 13, 2020 • Cars & Trucks

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98 Pontiac GRAND am

The plugs and crank sensor could have done it, but the TPS and idle air control would have nothing to do with a random miss.
A more likely cause is the ignition module or a fuel problem. You may have to wait until the problem is bad enough to kill the engine or you have more codes to check out.

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May 20, 2013 • Cars & Trucks

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Audi A6 no cranking..

NEED HAVE VECHICLE CODE SCANNED FIRST LOOK FOR FAULT CODES MANY THINGS WILL CAUSE NO STARTING,LIKE BAD CRANKSHAFT POSITION SENSOR.FAULTY CAMSHAFT POSITION SENSOR,BAD SPARK PLUGS FOULED OUT BY FLOODING ENGINE DUE TO LEAKING FUEL INJECTORS,BAD ENGINE COOLANT TEMPERATURE SENSOR,BAD MASS AIR FLOW SENSOR.FAULTY ECM. CODE SCAN VECHICLE FIRST.IF NO FAULT CODES CAME UP YOU COULD HAVE FAULT IN FUEL SYSTEM, COULD HAVE STOPPED UP FUEL FILTER,BAD FUEL PUMP RELAY OR FUSE THE FUEL PUMP COULD BE FAULTY. TURN IGNITION SWITCH TO ON POSITION LISTEN FOR FUEL PUMP OPERATION IN FUEL TANK, YOU SHOULD HEAR FUEL PUMP RUN FOR FEW SECONDS THEN TURN OFF.IF NO FUEL PUMP BAD MORE LIKELY BUT CHECK FUSE AND RELAY FIRST BEFORE BUYING NEW FUEL PUMP.DONT BUY NEW PARTS HAVE VECHICLE CODE SCANNED FIRST USING DIAGNOSTIC SCANNER YOU COULD HAVE BAD CONTAMINATED FUEL.

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Oct 06, 2011 • 2000 Audi A6

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New starter goodfuses,relaysbattery still no start

Check fuel pump 1st, should here it hum for a few seconds when you turn the key to ON (not starting). A bad crankshaft position sensor will cause a no start, yours may have a camshaft sensor as well. ECM needs both to run engine. Does the CEL come on for a few seconds like the other warning lights when you turn the key to ON? If not ECM is dead, shorted out or ground/power is gone to it. Check each spark plug and the wires. If spark is ok on for each plug, fuel pump comes on, I would look at the injectors but usually you get a stall as one goes bad. If those are ok then replace the crankshaft sensor but keep in mind the ECM might be fried.

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Sep 03, 2010 • 1995 Jeep Cherokee

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1998 elantra was running fine and motor just died. Will turn over fine but will not start. I had filled up with fuel and driven about 50 miles when this happened.

Is the engine getting fuel and spark?

Try to put a few teaspoons of gas in the throttle body to see if it starts up. If it doesn't then the engine's spark plugs may not getting spark.

A possible coil may be the root of the above problem.

If it does start and run for a few seconds then the spark is good, but the fuel pump may not be pressurizing (bad fuel pump) or the fuel injectors are not firing (possible PCM or Powertrain Control Module).

A crankshaft position sensor can also cause a no start condition.
It is located near the Crankshaft of the engine.

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Here's more information about the crankshaft position sensor which if bad, can cause a no start or no run condition.
Crankshaft Position Sensor Engine speed is a very important input to the Engine Management System (EMS). Crankshaft speed and position are the basis for many calculations made by the computer. Crankshaft position values are transmitted to the computer by pickup coils also known as Permanent Magnet (P/M) generators, hall-effect sensors or optical sensors. The Crankshaft Position Sensor (CKP) also known as engine speed sensor is located in close proximity to the crankshaft.
In addition, the EMS uses minute variations in the CKP sensor data to determine engine misfire. The EMS uses this information in conjunction with the camshaft position sensor to perform misfire diagnostics.
Related Symptoms No Start / Intermittent Start Condition – Can be caused by a faulty crankshaft position sensor due to loose connections, bad grounds, high resistance in the circuit, or opens in the circuit. (See also Engine Mechanical)
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These are just a few possibilities, and if one takes it to the dealer to have the engine diagnosed, that might be a good place to continue of the above doesn't isolate the problem sufficiently for repair of the no start condition.

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Aug 06, 2010 • 1998 Hyundai Elantra

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1994 Chevrolet Astro It takes 2 to 5 cranks to start. Each crank turns the cars electrical stuff on and revs the engine however it doesnt start.What is the issue?

Either you are not getting spark or not getting fuel. A bad crankshaft position sensor would cause no spark at all. You can pull one spark plug, place it back on the plug wire. Lay the plug electrode next to a metal surface. Have someone else crank over the engine while you observe for spark. You should see a spark jump from plug to the metal surface. (plug electrode should be no more than 1/4" away) If you don't have spark, put the plug back in and move on to the next plug and try that one. (the correct way is to use a spark tester) If you have no spark in any plug, you may want to test the crankshaft position sensor with an ohmmeter. You can also use a meter to test power at the ignition module.
If you find that you do have spark in every plug, then it's possible that you don't have fuel. There is a fuel pressure test port on the fuel rail. There is a cap and a valve. With the key in ON position ,you can place rag over the test port, press in on the valve and there should be fuel that comes out meaning there is fuel pressure. (the correct way is to use a fuel pressure gauge if you have one)
If you find there is no fuel pressure, turn the key off and back on again. You should hear the fuel pump. If you can hear the fuel pump, then it is working. That means you may have a plugged fuel filter or faulty fuel pressure regulator. If you do not have hear the fuel pump, check the fuse and fuel pump relay. You can test the relay and a fuse with an ohmmeter on the ohm setting. You can also use a voltmeter and check power to the relay and also to the fuel pump to test for 12 volts. If you have power to the pump but the pump is not running, it is likely faulty. If you don't have power to the pump, then either the relay or fuse is bad. If they test out ok, then test power from ECM.

These are the most common causes of a no start. If you have any bad sensors of any sort, it would likely set of the check engine light. Then the computer should be tested for engine codes which can be done with a scan-tool.

Read full answer

Jun 18, 2010 • 1994 Chevrolet Astro

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4answers

My chevy express van 1500 cranks but wont start

test and see if you have spark and fuel preasure, you may have bad feul pump, common problem is the fuel pump goes bad, but check before replacing.

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Oct 01, 2009 • 2000 Chevrolet Express Cargo

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Will a bad crankshaft position sensor cause the fuel pump not to get power to it ?

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Randy Ohler

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Turns over but wont fire 99 Saturn SL

Car wont start

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No spark to front plug have replaced coil already no fuel pump either

98 Pontiac GRAND am

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New starter goodfuses,relaysbattery still no start

1998 elantra was running fine and motor just died. Will turn over fine but will not start. I had filled up with fuel and driven about 50 miles when this happened.

1994 Chevrolet Astro It takes 2 to 5 cranks to start. Each crank turns the cars electrical stuff on and revs the engine however it doesnt start.What is the issue?

My chevy express van 1500 cranks but wont start

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Will a bad crankshaft position sensor cause the fuel pump not to get power to it ?

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Related Questions:

Turns over but wont fire 99 Saturn SL

Car wont start

Engine will not start

No spark to front plug have replaced coil already no fuel pump either

98 Pontiac GRAND am

Audi A6 no cranking..

New starter goodfuses,relaysbattery still no start

1998 elantra was running fine and motor just died. Will turn over fine but will not start. I had filled up with fuel and driven about 50 miles when this happened.

1994 Chevrolet Astro It takes 2 to 5 cranks to start. Each crank turns the cars electrical stuff on and revs the engine however it doesnt start.What is the issue?

My chevy express van 1500 cranks but wont start

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Turns over but wont fire 99 Saturn SL

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