Question about 2004 Pontiac Grand Am

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Cranks will not start where is the sensor that makes it get fire to the motor I belive it is not fireing .

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Grab a Spark tester from a parts store if you believe it is not firing, and locate the coil packs. Plug the tester on to the coil pack, and in to the corresponding plug wire when you turn it over you will see spark if it's working. If a coil is not working, switch it with another coil and see if the good coil has spark in the same position as the one that appeared bad. If the good coil also does not fire from that position, thecontrol module is bad. The control module is the plate that the coil packs sit on it is quite easy to replace by removing the coils, however not the cheapest part, hopefully it is the coil for your sake.

Posted on Dec 12, 2009


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If the crank sensor is bad could I still have fire but just not firing right? Or should I say if I have fire does that automatically mean the crank sensor is good and could it make the motor turnslowr

the purpose of a crank sensor is to fire the plugs at the correct time in relation of the piston position
with out that knowledge of where the piston is, the ECM will not initiate a spark ( if it is bad or there is a wiring problem the default is no spark)
so crank sensors either work or they don't and have no bearing on the rpms of the motor
the cam sensor on the other hand identifies where the valves are in relation to the piston position and tell the ECM to vary the valve timing in relation to engine rpms
they either work or don't and mostly when they don't it is because of a broken belt or chain or wiring( again the default is no spark)
the problem may be from a faulty accelerator position sensor or throttle position motor or the ECM has placed the system i limp mode
best advice is to have the fault codes read and determine exactly where the problem is

Apr 15, 2016 | Cars & Trucks

1 Answer

Can the camshaft position sensor be a problem to start the car

Nope, it will make it crank more before starting, but the cam sensor just tells the computer what stroke the engine is on, the crank sensor is what the computer fires off of. You need to figure out what your car does not have. If it has no spark look to the coils and see if they are getting the signal to fire the plugs. If so, you probably need coils, if not look to the crank sensor. see if you have voltage where you need it. If you have fire check for fuel pressure, if you have fuel pressure and fire make sure the injectors are firing. If it seems you have everything make sure the engine is in time.

Feb 25, 2016 | 2004 Mitsubishi Eclipse GTS

1 Answer

How crank sensor work on 2002 nissan maxima

A crankshaft position sensor or a camshaft position sensor can both cause a no fire condition. Both of these sensors are magnetic sensors that communicate with each other and pass that information on to the computer, letting it know that the motor is in correct time. Of either of these sensors go out, the computer doesn't know if the motor is in time, and can keep the engine from firing.

If you just replaced the rear main seal, double check to make sure that both sensors got reconnected (if you had to disconnect them)first thing. After that, you might look into testing them. I'm sure you can do an ohms resistance test, but also make sure you're getting voltage from the connector while trying to crank the motor. Ican tell you from experience that those cars have issues with their camshaft position sensors. Good luck!

Jun 23, 2014 | 2001 Nissan Maxima

2 Answers

97 buick park avenue change cam and crank sensor still no fire

asd relay or fuse
camshaft not spinning
bad pcm
damaged wiring harness

Mar 25, 2013 | 1997 Buick Park Avenue

1 Answer

I have replace coil ,crank sensor, cam sensor,disturber cap and rotor and still won"t fire

did u check the engine control fuse ? its located in the engine compartment fuse box i do belive its a 30 ! if tha fuse is blown then u will get no fire ! it took me awhile to figure out this on my own and i did all the same things and all it was caused by the coil shorting out or flat out hit the exspration date

Feb 23, 2013 | 1998 Dodge Ram 1500 4WD

1 Answer

Motor is miss firing p3o3 changer ecu after few mins mis fires is my crank position sensor not reading the third cylinder for some reason i did a motor swap ran new motor 3 or 4 hours had miss shift...

your crank position sensor does not read individual cylinders, only the position of the crank shaft. make sure the plugs and wires are good, check the spark coming from the coil, make sure there are no vacuum leaks at intake manifold, check timing, then do a leak down test to make sure you don't have a bent or damaged valve in the cylinder head.

Mar 31, 2011 | Honda Civic Cars & Trucks

3 Answers

I have a 1994 Dodge Stealth 3.0 DOHC Non Turbo. It won't start. It only gets fire on one coil. All teh coils are good fule pump works, New crank sensor, New spark plugs and wires, motor been port and...

look did u replace the censor where harmonic balancer is an the an the crank censor they are both like magnitos theres a metal fan blade looking thing that rotates through it make sure its not damaged an locked down let me know my email is

Mar 15, 2011 | 1994 Dodge Stealth

3 Answers

Changed motor now car will not start

the computers that tell the engine when to fire are sometimes different even with the same motors - replace the sensors from the old onto the new motor and i bet it will run -

also there are sensors other than just on the engine itself - also check all ground wires - and recheck all wires and make sure none are hanging without being connect - also check ur main fuse in the fuse box under the hood -

Dec 27, 2009 | 1998 Cadillac Catera

2 Answers

2003 pt cruiser sensors

check the battery and make sure it has a fully charge,also check to make sure the start motor pinion is not jammed in the flywheel, and check the coil pack to make sure have spark.also check the crank sensor

Feb 14, 2009 | 2003 Chrysler PT Cruiser

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