Multiple Misfire and Cam Sensor

V8Killer · 06-24-2012, 03:18 PM

Okay guys.

I decided to start a thread on here b/c I feel not enough people are looking at my nitrous thread to actually chime in on their thoughts. A few weeks back we had a bad misfire while using the nitrous during a data logging session and all the spark plugs were pretty much fried. I replaced the spark plugs and the car started up just fine but the car is running like crap. As you can see by the title those are the codes I am getting when I connect my cipher cable to the computer using uprev. We have checked the new plugs, they are still good, the coil packs are good. I drove it yesterday to move the car b/c we were on the assumption this motor is done but that can't be the case. It starts up just fine, no black smoke or oil in any weird places and no tapping, winding, grinding noises coming from the engine itself. When I drove it she was obviously sluggish but still revved it up to 7grand on each shift and got the car up to 100. Just runs like crap. We are wondering if it could be something on the fuel side possibly bad injectors. Anybody got any thoughts on this?

SPOHN · 06-24-2012, 04:32 PM

Well you said you changed the plugs but what about the cam sensor? Is it still throwing that code? Reguardless it most likely is still playing a big part in why it's running sluggish.

V8Killer · 06-24-2012, 06:24 PM

I am going to get a new cam sensor and replace it to see if that could be the cause but it is a process of elimination. I do know that w/o the cam sensor in the car will not run. Possibly not functioning right?

kellyefields · 06-24-2012, 08:35 PM

this might be something to consider, check your MAF sensors for damage. I am not sure where your spray is in relation to the sensors but there could have been some blowback that damaged them causing you to have the random misfire codes. i would also pull the manifold and look for any possible dirt/burnt gas etc it should be clean if it is not then that may signal something blowing back that could have possibly got to the MAF sensors.

V8Killer · 06-24-2012, 09:13 PM

Quote:

Originally Posted by kellyefields

this might be something to consider, check your MAF sensors for damage. I am not sure where your spray is in relation to the sensors but there could have been some blowback that damaged them causing you to have the random misfire codes. i would also pull the manifold and look for any possible dirt/burnt gas etc it should be clean if it is not then that may signal something blowing back that could have possibly got to the MAF sensors.

That has already been done and they are good to go. The cylinders that are misfiring are on the driver side front and back.

7419sundat · 06-24-2012, 09:41 PM

Have you done any compression and leak down tests?

V8Killer · 06-24-2012, 09:46 PM

None, we were gonna do a compression test but the fitting on our cars is very small.

7419sundat · 06-24-2012, 10:16 PM

I would start with that. Does the engine shake when idling. Try to get a scan tool and look at the PIDs like o2 and fuel inj etc actually everything, you need spark fuel compression start with one then check the others. Try to take everything clue in and come to a diagnosis.

SS_Firehawk · 06-25-2012, 01:56 AM

I would look at your maf sensors or injectors after you replace your cam sensor. It's something that is happening to more than one cylinder, and that's either fuel or air. Anything else I think may be catastrophic. Have you tried logging your vehicle with it running in it's current condition?

V8Killer · 06-25-2012, 09:53 AM

Quote:

Originally Posted by 7419sundat

I would start with that. Does the engine shake when idling. Try to get a scan tool and look at the PIDs like o2 and fuel inj etc actually everything, you need spark fuel compression start with one then check the others. Try to take everything clue in and come to a diagnosis.

No the engine doesn't shake more than normal when idling that we can tell anyways. My buddy said he did all this already and everything check out okay.

V8Killer · 06-25-2012, 09:54 AM

Quote:

Originally Posted by SS_Firehawk

I would look at your maf sensors or injectors after you replace your cam sensor. It's something that is happening to more than one cylinder, and that's either fuel or air. Anything else I think may be catastrophic. Have you tried logging your vehicle with it running in it's current condition?

Ya my buddy said he did a few data logs and everything turned out fine except don't quote me on this I believe he said the cam sensor was off a little. I just talked to Nissan and they said to replace sensor and it should fix the problem but if it doesn't a compression test is a little over 200 bucks and he couldn't give me a quote on a leak down test b/c he wasn't sure how many hours it would take.

blackonorange · 06-27-2012, 11:44 PM

Let us know what you find

V8Killer · 06-28-2012, 06:50 AM

I switched out the cam sensor and no change with multiple misfire.

06-24-2012, 03:18 PM	#1 (permalink)
V8Killer A True Z Fanatic Join Date: Feb 2011 Location: Newport, NC Posts: 1,127 Drives: It Hard Till It Pops Rep Power: 16	Multiple Misfire and Cam Sensor Okay guys. I decided to start a thread on here b/c I feel not enough people are looking at my nitrous thread to actually chime in on their thoughts. A few weeks back we had a bad misfire while using the nitrous during a data logging session and all the spark plugs were pretty much fried. I replaced the spark plugs and the car started up just fine but the car is running like crap. As you can see by the title those are the codes I am getting when I connect my cipher cable to the computer using uprev. We have checked the new plugs, they are still good, the coil packs are good. I drove it yesterday to move the car b/c we were on the assumption this motor is done but that can't be the case. It starts up just fine, no black smoke or oil in any weird places and no tapping, winding, grinding noises coming from the engine itself. When I drove it she was obviously sluggish but still revved it up to 7grand on each shift and got the car up to 100. Just runs like crap. We are wondering if it could be something on the fuel side possibly bad injectors. Anybody got any thoughts on this? __________________ "Punch" Too much to list and a baby shot of nitrous....

06-24-2012, 04:32 PM	#2 (permalink)
SPOHN A True Z Fanatic Join Date: Feb 2010 Location: Covington, GA Age: 46 Posts: 14,844 Drives: Waiting on next Z Rep Power: 221	Well you said you changed the plugs but what about the cam sensor? Is it still throwing that code? Reguardless it most likely is still playing a big part in why it's running sluggish. __________________

06-24-2012, 06:24 PM	#3 (permalink)
V8Killer A True Z Fanatic Join Date: Feb 2011 Location: Newport, NC Posts: 1,127 Drives: It Hard Till It Pops Rep Power: 16	I am going to get a new cam sensor and replace it to see if that could be the cause but it is a process of elimination. I do know that w/o the cam sensor in the car will not run. Possibly not functioning right? __________________ "Punch" Too much to list and a baby shot of nitrous....

06-24-2012, 08:35 PM	#4 (permalink)
kellyefields A True Z Fanatic Join Date: Nov 2010 Location: Lexington Ky #BBN Age: 48 Posts: 1,156 Drives: Supercharged Rep Power: 17	this might be something to consider, check your MAF sensors for damage. I am not sure where your spray is in relation to the sensors but there could have been some blowback that damaged them causing you to have the random misfire codes. i would also pull the manifold and look for any possible dirt/burnt gas etc it should be clean if it is not then that may signal something blowing back that could have possibly got to the MAF sensors. __________________ MY 2009 SC BUILD. Last edited by kellyefields; 06-24-2012 at 08:37 PM.

06-24-2012, 09:46 PM	#7 (permalink)
V8Killer A True Z Fanatic Join Date: Feb 2011 Location: Newport, NC Posts: 1,127 Drives: It Hard Till It Pops Rep Power: 16	None, we were gonna do a compression test but the fitting on our cars is very small. __________________ "Punch" Too much to list and a baby shot of nitrous....

06-24-2012, 09:41 PM	#6 (permalink)
7419sundat Base Member Join Date: Aug 2011 Location: colorado Posts: 145 Drives: 09 370z Gtm TT 2 Rep Power: 14	Have you done any compression and leak down tests?

06-24-2012, 10:16 PM	#8 (permalink)
7419sundat Base Member Join Date: Aug 2011 Location: colorado Posts: 145 Drives: 09 370z Gtm TT 2 Rep Power: 14	I would start with that. Does the engine shake when idling. Try to get a scan tool and look at the PIDs like o2 and fuel inj etc actually everything, you need spark fuel compression start with one then check the others. Try to take everything clue in and come to a diagnosis.

06-25-2012, 01:56 AM	#9 (permalink)
SS_Firehawk Premium Member Join Date: Oct 2011 Location: Tampa Posts: 4,142 Drives: 13' Magma Red Nismo Rep Power: 7335	I would look at your maf sensors or injectors after you replace your cam sensor. It's something that is happening to more than one cylinder, and that's either fuel or air. Anything else I think may be catastrophic. Have you tried logging your vehicle with it running in it's current condition? __________________ Old Car:GTM TSC'd 550whp / 410lbft tq @ 11.88PSI New Car: Under Construction

06-27-2012, 11:44 PM	#12 (permalink)
blackonorange A True Z Fanatic Join Date: Jul 2011 Location: Saskatchewan Posts: 1,078 Drives: 09 370z Rep Power: 16	Let us know what you find

06-28-2012, 06:50 AM	#13 (permalink)
V8Killer A True Z Fanatic Join Date: Feb 2011 Location: Newport, NC Posts: 1,127 Drives: It Hard Till It Pops Rep Power: 16	I switched out the cam sensor and no change with multiple misfire. __________________ "Punch" Too much to list and a baby shot of nitrous....

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