thesynic

2002 996 6spd. I had a misfire on the passenger side bank of cylinders a few weeks ago that lasted until I shut it off at my destination and would stay after restarting. Happened again just recently. Odd because 99% of the time I drive it, it runs perfectly. Then all of a sudden car died while driving. Lost all power like pulling the plug. Would not restart, but I had power to all electronics and it turned over no problem. Let it set for 15 minutes. Started right up no issues.

2 days later I replace all three coils on the suspect pass. cylinders (new plugs 1k ago), runs great to work. Come out after work , won't start. I am suspecting fuel pump or fp relay. I am also suspecting the crankshaft position sensor, where is this located and is it a biotch to get at? Anything else to suspect? I'm borrowing a Durametric tomorrow.

function12

Have you check the coil pack connections? Maybe you did not get them snapped together.

RF5BPilot

Consider posting on renntech.

thesynic

I have driven it since I installed the coils and it ran great, then I went to start it and will not fire up. turns over but no love. Gotta be fuel or spark but the no spark is tricky given that there are alot of possibilities. Almost like the DME cut the engine. Hoping the Crankshaft position sensor will be the culprit. I'm open to ideas... Thanks all.

Also, will the ignition switch failure keep the car from starting all together (like the old ...click....crickets....click...) or what I am seeing where it actually turns over but won't start?

redridge

crankshaft sensor is right next to the aos and directly diagnal on the otherside of the valve cover.... sensor looks like this...

thesynic

Thanks alot. I need to swap it in a parking garage. Do I need to pull the rear wheel off to get at it? Is it potentially possible to replace it without a jack? ( this seems like an idiotic question, but have to ask)

redridge

Oh man.... it is held on by an allen screw and is a b*tch to get at (and I have a lift). You will need a jack.... remember, safety first. I will try to snap a pic for you....


edit: the sensor is burried under all that cable mounts (right side of the rubber bellows).... but I really cant see this sensor going bad, Its a passive device and acts as a proximity sensor (no physical mechanical contact). If you have a durametric, I believe you can monitor the cams via this sensor.

thesynic

Man, that it awesome of you to take a pic for me like that. I really appreciate it. I ran the Durametric an found only 2 codes showing the previous misfires and thats it, its not much help in a no start situation with no good codes to work with. If it's physically possible to do without removing alot of stuff I will prevail. Thanks alot!

ivangene

well I would take it easy throwing parts at it without knowing what's wrong (unless you like that plan)

dying without any codes to me says fuel as electrical (spark) will normally toss a code into the DME (IIRC) - I forget how but I think you can check fuel at the rails - If you were just in there and now having issues I would also re-check the work you just did...connections ect.

you replace ALL (3???) coil packs theyre are 6 you know - might consider looking at the other side?? (though a coil should not cause a no-start IMO)

Macster

You might get by without replacing the crankshaft position sensor. The no start symptom might be due to corrosion at the connector. To address this disconnect the sensor from the wiring harness then connect it to the harness again.

The contacts will be renewed/rejuventated by the wiping action of the unplug and plug operation.

Unlikely the sensor will show up at an OBD2 error code. Emissions are not affected by this sensor's non-operation so there is likely no error code logged.

With a PST2 one might be able to look at the waveform from the sensor and from this know the sensor is at fault or not.

Sincerely,

Macster.

thesynic

I realize that this is years later, but I wanted to close the loop on this issue. The issue with the no start out of no where ended up being a bad fuel pump relay. I had to flatbed it home and then look into the problem. I also replaced the fuel pump for good measure. That was fun submersing half my arm and operating a ratchet in gasoline. Fuel filter is part of the pump assembly. Started up instantly after replacing the relay though.