HELP! 02 altima Replced clutch and now car wont start!

[Delearious02]

OK So I Replaced the clutch in my 02 altima 3.5 5 speed and now it wont start..... I have double checked every sensor and replced a bunch with no effect. It just cranks and cranks and cranks cranks nice but still no spark. I have checked the codes and its getting no codes and no spark.... I have had a mechanic bring his diag tool not the crappy one from autozone either.... how does the 02 read crank signal ? does it have anything to do with the flywheel? Its getting fuel and air ..... just no spark ..... ANY INPUT AT ALL ???

[Delearious02]

no one has any ideas? or just dont like me....

[SHIFT_COUPE]

I'll get a tech in here for ya. This is over my head man!

[PapaSmurf2k3]

That's crazy man... did you happen to dislodge a wire while you were doing the clutch job or something? That's pretty much the only thing I can think of... AFAIK, the 2 systems aren't connected at all. If you messed something up on the clutch, I would imagine the car would try to lunge forward or something while you cranked it.

[Florida240sx]

Check your fuel level? Perhaps ran low on gas at the same time?
Check fuel and spark then report back. Any sensors disconnected it should still start besides maybe coil

[wade001]

That can be tricky. based on there being no spark it could be a few things, but did you test more then one spark plug wire? i think a likely source of your problem will be with your coil, either it's not getting enough power or it might be bad or various other problems. to truely pinpoint the problem you need special diagnostic tools, a scan tool will be of no use with this. the only thing i can think of right now that you can do is to make sure the coil is getting 12v from the battery, maybe it could tell you if the power side is good if you look at a voltage reading while cranking and see if it drops (im not sure if it will pick it up as this happens too fast for a dmm to pick it up), which i believe it shouldnt. but you should take it to a place that has the proper tools. that is your best bet.

[IanS]

That can be tricky. based on there being no spark it could be a few things, but did you test more then one spark plug wire? i think a likely source of your problem will be with your coil, either it's not getting enough power or it might be bad or various other problems. to truely pinpoint the problem you need special diagnostic tools, a scan tool will be of no use with this. the only thing i can think of right now that you can do is to make sure the coil is getting 12v from the battery, maybe it could tell you if the power side is good if you look at a voltage reading while cranking and see if it drops (im not sure if it will pick it up as this happens too fast for a dmm to pick it up), which i believe it shouldnt. but you should take it to a place that has the proper tools. that is your best bet.

He has a VQ, which has individual coil packs.

Have you checked more than one coil for spark? What kind of spark tester are you using?

While watching the datastream on the scan tool, how does the crank reference signal read? IIRC the crank angle sensors read off the flywheel, and without crank reference the computer will not signal the coils. You may have moved the sensor too far from the reluctor, or you could have pinched the wires between the trans and engine.

When you removed the clutch did you also remove the flywheel?

[the converted]

Did you do a new flywheel? There's a lot of confusion between the front and rwd one and they are not interchangeable. Pull your cas on the bellhousing and make sure that the tone ring is centered under the sensor. If you keep cranking for 20-30 second it will start without that sensor working, if that is your actual problem.

[SteveTheTech]

OK So I Replaced the clutch in my 02 altima 3.5 5 speed and now it wont start..... I have double checked every sensor and replced a bunch with no effect. It just cranks and cranks and cranks cranks nice but still no spark. I have checked the codes and its getting no codes and no spark.... I have had a mechanic bring his diag tool not the crappy one from autozone either.... how does the 02 read crank signal ? does it have anything to do with the flywheel? Its getting fuel and air ..... just no spark ..... ANY INPUT AT ALL ???

I bet you a beer you didn't put the flywheel back in the exact spot it came off. The flywheel is indexed on the VQ and the hall effect sensor needs to send the same signal the cams are seeing. However since you say there are not DTCs I'm betting the sensor is either not installed or installed out of magnetic "reach". If the sensor is plugged in and perfect the trans has to come back out and you need to check the index marks.

[PapaSmurf2k3]

...that is utterly retarded. This is one small reason why I hate new cars.

[SteveTheTech]

02-03 was a fun year at Nissan... we learned stuff the old way, I joined the party in 04 when they were getting used.

There was a tsb I think a few years later (I'll check)

The crank gets its 1* position signal from the crank. This is used for cranking function, the cam timing is variable so each has it's own sensor.

Typically the crank is considered the constant (if compression is good) so bolting a signal plate to the flywheel on the VQ seems like a decent place to put the sensor. The 1 degree signal is one of (if not the) the most important and most often incorrectly diagnosed for a while, until a code is triggered of the other things are ruled out. Prior to this it was monitoring the harmonic balancer, before that it was only the cam shaft, the crank is has so many less variables, greater accuracy is always better, right.

[Delearious02]

Ok so it has been a while but the car is almost an hour from where i live I found out that an aftermarket flywheel was installed i dont know the brand all i know is its extreamly expensive and was told its "counter weighted" ... is there anyway to see if the magnetic sensor is causing this? a way to make the ecu goto a default reading or something? I have checked spark to all plugs and coil packs it gets no reading on a standard voltmeter.... I Am sooooo sure its the sensor on the flywheel but id really hate to get the car and then go thru all the trouble replacing the flywheel and all if this is not it any tricks u hotshots know that could help me out?

[the converted]

Best bet is just to pull the CPS out of the bell housing and make sure that the trigger wheel is lining up with it. I was looking over my notes from when I was redesigning one for a company, and the difference in thickness was 0.270". That was just enough to get the trigger wheel under the sensor so it would read. You can verify that you have it installed properly as far as the pins go with this. http://www.jimwolftechnology.com/wolfpd ... _check.pdf Good luck.