Possible crank angle sensor wire problem?
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I installed the CAS wires last week. Other than the first couple of cranks the car/ECU is having problem maintain idle, everything was running fine the whole week...until today...
I was at a stoplight heading home. After the light turned green I proceeded to move forward. All of a sudden the car started to choke.
I immediately turned off the AC and pulled my car to the side. The car will start choking after ~2500 rpm. Even if I free rev the engine it wont go pass ~2500rpm. I noticed that the car is running extremely rich. A/F was at ~9.x:1 at idle(was ~14.5:1) and ~10.x:1 when I tried to gas it.
I turned off the engine didn’t know whats wrong with it. I let it sit for about 3 mins and started it up again….normal. Revs normal, A/F reads normal. I then drive the car home without any issues.
I suspected the CAS wire because that is the only thing I’ve installed in the past couple of month.
Anyone knows what might be the problem?
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I was at a stoplight heading home. After the light turned green I proceeded to move forward. All of a sudden the car started to choke.
![Confused](https://my350z.com/forum/images/smilies/confused.gif)
![](https://my350z.com/forum/images/smilies/icon33.gif)
I suspected the CAS wire because that is the only thing I’ve installed in the past couple of month.
Anyone knows what might be the problem?
![Confused](https://my350z.com/forum/images/smilies/confused.gif)
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My dealership tried the install...had similar problems - had to take the CAS wire out and I am trying again this coming week.
Charles is aware of my pain....I share yours.
Charles is aware of my pain....I share yours.
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if the CAS wire is properly installed, then its not the problem. If you suspect it then I would recommend going over the wiring and checking to make sure its correct and intact. Maybe it came loose, or maybe they routed it in way of harm such as contacting the exhaust manifold... impossible to tell from here... however if your not getting a check engine light then its highly doubtful to be the problem.
If a 350z/G35 doesnt get CAS signal it will take several seconds to start the engine as the ECU is waiting for the signal, after a few seconds it realizes that it will not get one and it will default to run off only the cam triggers and trip a check engine light. If your symptons do not include this, its highly unlikely to be the problem.
If a 350z/G35 doesnt get CAS signal it will take several seconds to start the engine as the ECU is waiting for the signal, after a few seconds it realizes that it will not get one and it will default to run off only the cam triggers and trip a check engine light. If your symptons do not include this, its highly unlikely to be the problem.
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Originally Posted by luanda
My dealership tried the install...had similar problems - had to take the CAS wire out and I am trying again this coming week.
Charles is aware of my pain....I share yours.
Charles is aware of my pain....I share yours.
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Originally Posted by phunk
Phatmitzu: can you post a list of your mods so I can consider more options.
K&N Typhoon CF Intake
Kinetix V4 Plenum
Kinetix HF Cats
UR Crank Pulley
Nismo Headers
Nismo Flywheel
Nismo Clutch
JIC Y-Pipe
Power House Amuse R1 Titan Exhaust
Apexi SAFC-II
Zeitronix A/F Wideband
Shielded CAS Wires
Pro-1 Torque Damper
S2000 Engine Start
B&M Short Shifter
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Originally Posted by phunk
If a 350z/G35 doesnt get CAS signal it will take several seconds to start the engine as the ECU is waiting for the signal, after a few seconds it realizes that it will not get one and it will default to run off only the cam triggers and trip a check engine light. If your symptons do not include this, its highly unlikely to be the problem.
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I am not sure what you mean... are you saying that with all 3 wires hooked up it was working fine, but then when you connected the ground strap wire it stopped working properly?
If that is the case, then yours might actually be defective... the only thing i can think of that could possibly cause this is if the shielding became in contact with another wire internally... which is not likely.
When we test each ground strap wire for continuity to ensure that we got a good connection with the shielding, we have to just slightly ***** thru the cover to contact a probe with the shielding... i suppose that its possible that one of us pricked it too deep and a strand of shielding is touching another wire... I really dont see that happening but perhaps it did. If this is the case, you might have the first one to actually require replacement. So far I havent had a single one sent back even for inspection.
send me details via PM, and if it requires replacement then one will be sent to you immediately.
If that is the case, then yours might actually be defective... the only thing i can think of that could possibly cause this is if the shielding became in contact with another wire internally... which is not likely.
When we test each ground strap wire for continuity to ensure that we got a good connection with the shielding, we have to just slightly ***** thru the cover to contact a probe with the shielding... i suppose that its possible that one of us pricked it too deep and a strand of shielding is touching another wire... I really dont see that happening but perhaps it did. If this is the case, you might have the first one to actually require replacement. So far I havent had a single one sent back even for inspection.
send me details via PM, and if it requires replacement then one will be sent to you immediately.
Last edited by phunk; 06-06-2005 at 03:32 AM.
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Originally Posted by phunk
do you have a check engine light?
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Happened to me like 2 weeks ago Phatmitzu, car would backfire and sputter if i went over 3k, pulled it into my friends house, let it idle, it would barely idle, was choking and sputtering, turned it off, came back out like 5 minutes later, started and has ran fine ever since.
My guess is i had just serviced my pop-charger that day and maybe oiled it a little too much.
My guess is i had just serviced my pop-charger that day and maybe oiled it a little too much.
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you know what is very interesting... now that you guys mention it... there was 3 times i specifically recall, even with my FCON... where the car would act extremely wierd and backfire and pop when I tried to accelerate beyond very very very light load... then I would shut off the engine and start it again and everything was mint. My car doesnt even have a CAS wire upgrade yet. Very ****in wierd... i dont see how it could possibly be related since the FCON is a full standalone... but maybe there is something going on here that we havent figured out yet... if its not related to the ECU directly, then its related to the signals being sent to the ECU... and if thats the case then of course even with my FCON things would get wierd... there has to be something else going wierd, and its definatly not the MAF since my FCON ignores that all together.
I might have to call Peter at APS and ask him exactly what was happening when he had CAS signal interference in their test car, however I dont see how my wire wouldnt correct that problem, and I dont see how you could blow the engine like that when it wont even go anywhere.... so its probably something totaly different... but time will tell.
I might have to call Peter at APS and ask him exactly what was happening when he had CAS signal interference in their test car, however I dont see how my wire wouldnt correct that problem, and I dont see how you could blow the engine like that when it wont even go anywhere.... so its probably something totaly different... but time will tell.
Last edited by phunk; 06-11-2005 at 03:33 PM.
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Any more information relevant to this problem?
My z has been doing this spontaneously over the past two weeks, last night being the worst case of the batch.
Symptoms:
super crazy rpm fluctuations
super crazy backfire
super crazy no acceleration (sputter, backfire, stall -- in that order)
super crazy crappy idle
car is basically stock -- exhaust, y-pipe, test pipes, intake.
Any insight would be greatly appreciated, Thanks in advance.
My z has been doing this spontaneously over the past two weeks, last night being the worst case of the batch.
Symptoms:
super crazy rpm fluctuations
super crazy backfire
super crazy no acceleration (sputter, backfire, stall -- in that order)
super crazy crappy idle
car is basically stock -- exhaust, y-pipe, test pipes, intake.
Any insight would be greatly appreciated, Thanks in advance.
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If it is that close to stock, take it back to the dealer. Most of us get laughed out of the dealer when we show up with FI. Consider yourself lucky.
Originally Posted by kurisuchan
Any more information relevant to this problem?
My z has been doing this spontaneously over the past two weeks, last night being the worst case of the batch.
Symptoms:
super crazy rpm fluctuations
super crazy backfire
super crazy no acceleration (sputter, backfire, stall -- in that order)
super crazy crappy idle
car is basically stock -- exhaust, y-pipe, test pipes, intake.
Any insight would be greatly appreciated, Thanks in advance.
My z has been doing this spontaneously over the past two weeks, last night being the worst case of the batch.
Symptoms:
super crazy rpm fluctuations
super crazy backfire
super crazy no acceleration (sputter, backfire, stall -- in that order)
super crazy crappy idle
car is basically stock -- exhaust, y-pipe, test pipes, intake.
Any insight would be greatly appreciated, Thanks in advance.