**UPDATE 3..have my answer**Blew engine..I think..turns over but won't fire...video
05-25-2012, 08:48 PM
#42
***UPDATE***
So, I checked everything. Basically, all we could find is that the scanner reads NO rpm's when cranking. So we're gonna put a new Crank Shaft Position sensor in.....not today, probably not this weekend. Maybe Wednesday I'll get a chance. Fingers crossed.
Also, when we charged the battery up better, it tuned over a little smoother and we saw the oil pressure come up a little while cranking. So hopefully nothing inside is bent or broke.
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So, I checked everything. Basically, all we could find is that the scanner reads NO rpm's when cranking. So we're gonna put a new Crank Shaft Position sensor in.....not today, probably not this weekend. Maybe Wednesday I'll get a chance. Fingers crossed.
Also, when we charged the battery up better, it tuned over a little smoother and we saw the oil pressure come up a little while cranking. So hopefully nothing inside is bent or broke.
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Poor wire routing had the wires under constant tension, and engine torque had eventually pulled them out of the eyelet's crimp.
05-28-2012, 09:32 PM
#43
Last case I saw like this was a C5...the ground eyelet bolted to the back of the driver side cylinder head had ripped both of the ground wires out.
Poor wire routing had the wires under constant tension, and engine torque had eventually pulled them out of the eyelet's crimp.
Poor wire routing had the wires under constant tension, and engine torque had eventually pulled them out of the eyelet's crimp.
But when it did come loose awhile back....only the passengers side 4 cylinders were running.
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05-28-2012, 09:45 PM
#44
UPDATE....video...turning over engine. Its not just one speed, it sounds like it has a little struggle spot.
http://s263.photobucket.com/albums/i...idstarting.mp4
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http://s263.photobucket.com/albums/i...idstarting.mp4
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05-28-2012, 10:03 PM
#45
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since you have fuel and air it has to be spark. a sensor is bad id bet a crank sensor or cam sensor like you think but check if ur getting spark... if you havent alrdy
05-28-2012, 10:25 PM
#48
TECH Senior Member
The crank sensor is primarily used for spark, but the cam sensor is used for phase (which of the two TDC positions...?);
most times once the PCM has figured out phasing it can ignore the cam sensor (or use it for a sanity check); the PCM can also figure out phasing without a cam sensor (it batch files until it finds the accelerating stroke); sometimes the PCM trusts the cam sensor and when it is bad can get confused;
the PCM always times spark and injectors from the crank sensor;
you should be getting low voltage AC signals from both crank and cam sensors.
most times once the PCM has figured out phasing it can ignore the cam sensor (or use it for a sanity check); the PCM can also figure out phasing without a cam sensor (it batch files until it finds the accelerating stroke); sometimes the PCM trusts the cam sensor and when it is bad can get confused;
the PCM always times spark and injectors from the crank sensor;
you should be getting low voltage AC signals from both crank and cam sensors.
05-28-2012, 10:26 PM
#49
If you can scan the car, see if any DTC's come up. Your crank position sensor will cut the spark out if its bad or unplugged. When I built my forged motor I left the crank sensor unplugged and the car had fuel but no spark. Plugged the sensor in and the car came to life.
Check all of the above suggestions as well just one more quick check with a scanner before you taring **** apart.
Check all of the above suggestions as well just one more quick check with a scanner before you taring **** apart.
05-28-2012, 10:41 PM
#58
You think..........its a forged Cola crank. Perhaps one of the strongest crankshafts ever made......according to top builders I've spoken to.
Is that what it sounds like to you from the video....?
If that did happen......would it take out the Crank Sensor......?
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Is that what it sounds like to you from the video....?
If that did happen......would it take out the Crank Sensor......?
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Last edited by LS6427; 05-28-2012 at 10:48 PM.
