Question about 1999 Pontiac Grand Am GT
We replaced the engine and all new sensors. The check engine light was throwing code P0336. Replaced both new crankshaft sensors, light still on. Took it to the dealership to flash or re-learn the ECM, light still on! In the interim, the dash lights started going haywire, blinkers stopped working, battery problems. The dealership wants to order a factory oem crankshaft sensor and re-flash, sounds like a waist of money. Could this be electrical and if so, how costly is this?
I had a similar thing happen with my cam position sensor. I replaced it, ran ok for a couple of days, threw and another CPS code. Replaced it a second time and it has been fine since. Which is why the garage probably wants to get an oem part. It could also be your pcm considering you are having multiple electrical problems. If you are having the dealership do the work, considering the age of the car, relative value of it, and the ridiculous price they charge I would cut my losses and trade it in. If you are handy and willing to put in the time and work scour the grand am forums and you may find a solution.
Posted on Apr 30, 2014
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Posted on Jan 02, 2017
The light will keep comming back on after the repairs were made if the Stored Code was not erased from the computers memory.Good Luck.
Posted on Dec 11, 2010
the code you have is for a misfire on #3 cylinder. (im sure you knew this right?). the crankshaft position sensor will not cause one individual cylinder to misfire. what i typicaly do in this scenario is switch the ignition wire off of the guilty cylinder onto a known good firing cylinder and see if misfire moves to the other cylinder. i repeat this process by switching the spark plug and finaly the fuel injector. a compression check may be in order as well (but not a likely cause) unless you have access to a tech 2 (gms diag computer) you will need to clear this code after each component is moved and see if you get a new code ie :p0304 if switched to #4 cylinder..other wise if you do have access to a computer that has a misfire chart in its features you can quickly identify the guilty component. as i side note the ignition coil may also be faulty, but i believe your vehicle has a 3.8liter meaning that it has a coil pack....switch the others i listed and see ow you make out....good luck!
Posted on Jun 11, 2009
The crankshaft sonsor is located between the timing cover and the harmoinc balancer on the passenger side of the engine.
Posted on Oct 06, 2009
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Symptoms - Engine Light ON (or Service Engine Soon Warning Light)
- Lack/Loss of Power
- Engine Stall Possible causes - Harness or connectors (The sensor circuit is open or shorted)
- Crankshaft position sensor may be faulty
- Signal plate may be damage
- Starter motor may be faulty
- Starting system circuit
- Dead (Weak) battery
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