cylinder 4 missfire.?
07-10-2007, 09:28 PM
#1
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Thread Starter
Join Date: Jun 2005
Posts: 200
cylinder 4 missfire.?
the original problem....
http://forums.maxima.org/showthread.php?t=528338
plugged it into the obd2 reader again, pulled another p102 maf high input, and a p113 iat highimput.. reset the codes, took it for a quick drive
checked the vac at idle and its at 17hg, at 2k rpm it remains at 17ishhg
went for a drive, service engine soon light came back on, got a code cylinder 4 missfire,(p304), and p300, multiple cylinder misfire.
anyone have any ideas?
http://forums.maxima.org/showthread.php?t=528338
plugged it into the obd2 reader again, pulled another p102 maf high input, and a p113 iat highimput.. reset the codes, took it for a quick drive
checked the vac at idle and its at 17hg, at 2k rpm it remains at 17ishhg
went for a drive, service engine soon light came back on, got a code cylinder 4 missfire,(p304), and p300, multiple cylinder misfire.
anyone have any ideas?
07-11-2007, 11:31 AM
#3
You should do what this man has suggested.
Originally Posted by madmik
Service manual... (www.vq35de.com/ESM/Nissan/Maxima/)
An excessively low voltage from the sensor is sent to ECM.
Harness or connectors (The sensor circuit is open or shorted.)
Intake air leaks
Mass air flow sensor
Manual states that ECU will enter into fail safe mode and will trigger fuel cut at 2400. This would explain why the car is sluggish.
If your buddy's MAF did not help, verify continuity of wires between MAF connection and ECU. If not MAF, then it may be a full ECU failure? MAF circuit is in section EC page 200. Check the fuses, including the ones next to windshield washer fluid. Diagram shows a 15 amp fuse for ECU.
Read code again. May have more than one code.
Reading you past posts, and seeing that you had CAI issues, double check for air leaks between MAF and throttle body (EGR hose too). You said 'much louder'... Intake loud or exhaust loud? If intake noise is consistent throughout rpm range, something is loose/cracked on intake side allowing un-metered air in and intake noise out.
An excessively low voltage from the sensor is sent to ECM.
Harness or connectors (The sensor circuit is open or shorted.)
Intake air leaks
Mass air flow sensor
Manual states that ECU will enter into fail safe mode and will trigger fuel cut at 2400. This would explain why the car is sluggish.
If your buddy's MAF did not help, verify continuity of wires between MAF connection and ECU. If not MAF, then it may be a full ECU failure? MAF circuit is in section EC page 200. Check the fuses, including the ones next to windshield washer fluid. Diagram shows a 15 amp fuse for ECU.
Read code again. May have more than one code.
Reading you past posts, and seeing that you had CAI issues, double check for air leaks between MAF and throttle body (EGR hose too). You said 'much louder'... Intake loud or exhaust loud? If intake noise is consistent throughout rpm range, something is loose/cracked on intake side allowing un-metered air in and intake noise out.
07-11-2007, 11:54 AM
#4
Newbie just Registered
Join Date: May 2005
Location: LA/OC, CA
Posts: 2,795
Originally Posted by marshallc
the original problem....
http://forums.maxima.org/showthread.php?t=528338
plugged it into the obd2 reader again, pulled another p102 maf high input, and a p113 iat highimput.. reset the codes, took it for a quick drive
checked the vac at idle and its at 17hg, at 2k rpm it remains at 2khg
went for a drive, service engine soon light came back on, got a code cylinder 4 missfire,(p304), and p300, multiple cylinder misfire.
anyone have any ideas?
http://forums.maxima.org/showthread.php?t=528338
plugged it into the obd2 reader again, pulled another p102 maf high input, and a p113 iat highimput.. reset the codes, took it for a quick drive
checked the vac at idle and its at 17hg, at 2k rpm it remains at 2khg
went for a drive, service engine soon light came back on, got a code cylinder 4 missfire,(p304), and p300, multiple cylinder misfire.
anyone have any ideas?
07-11-2007, 12:38 PM
#6
Supporting Maxima.org Member
Thread Starter
Join Date: Jun 2005
Posts: 200
did the plugs at like 85k, and its been fine since then
only thing that i havnt done that i was meaning to was change the fuel filter, which i guess i will while shes down.
does this sound like the problem that would be caused by the precat failure?
only thing that i havnt done that i was meaning to was change the fuel filter, which i guess i will while shes down.
does this sound like the problem that would be caused by the precat failure?
07-11-2007, 06:06 PM
#7
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Join Date: May 2005
Location: LA/OC, CA
Posts: 2,795
Originally Posted by Lovemycar
don't start that **** with those ignition coils i havent heard anyone complain about that in the 6th gen yet correct me if i'm wrong
07-12-2007, 01:26 PM
#9
IAT: Intake Air Temp. Same connector as MAF. From the service manual, high input voltage from IAT means high resistance, to me, an open circuit. But, if you have a bad ground somewhere, the signal could travel an incorrect path.
Check for twisted/loose pins in the connector, a cut wire between ECU and the connector. If it was the MAF, you buddy's MAF would have solved your problem. If the ECU is not receiving a signal from the MAF/IAT, you are probably running in fail-safe mode and running too lean, thus the misfire codes.
But, not enough fuel could could cause the same... collapsed fuel filter? You would not get much power on the highway in this case.
There is a TSB about fried coils caused by a damaged ground wire to the tranny (from the battery). Do you have a grounding kit? Bad grounds cause chaos inside an ECU.
Or grab a voltmeter and follow the service manual to check the wires.
Check for twisted/loose pins in the connector, a cut wire between ECU and the connector. If it was the MAF, you buddy's MAF would have solved your problem. If the ECU is not receiving a signal from the MAF/IAT, you are probably running in fail-safe mode and running too lean, thus the misfire codes.
But, not enough fuel could could cause the same... collapsed fuel filter? You would not get much power on the highway in this case.
There is a TSB about fried coils caused by a damaged ground wire to the tranny (from the battery). Do you have a grounding kit? Bad grounds cause chaos inside an ECU.
Or grab a voltmeter and follow the service manual to check the wires.
07-13-2007, 01:14 PM
#11
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Join Date: May 2005
Location: LA/OC, CA
Posts: 2,795
Originally Posted by marshallc
i was playing around with the obd2 reader and it has a im check function, i ran that and everything is ready but the catilyst, it says there is an error
why would a cat error cause a missfire?
why would a cat error cause a missfire?
I think it's the other way around where some unburned fuel erode or detonate in the cats.
07-15-2007, 10:02 PM
#12
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Join Date: Jun 2005
Posts: 200
well i pulled every coilpack while the car was running, ran even worse after every one was unplugged so its not a coilpack problem.
can anyone tell me where the service valve on the maximas fuel system is so i can pull the fuel pressure?
any idea as to what it should be at?
or fuel filter is located under the back seat correct?
can anyone tell me where the service valve on the maximas fuel system is so i can pull the fuel pressure?
any idea as to what it should be at?
or fuel filter is located under the back seat correct?
07-16-2007, 09:41 AM
#13
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Join Date: Nov 2003
Location: MN
Posts: 191
The fuel filter, pump and fuel level sensor are all in one assembly and is in the fuel tank. There is an access panel under the rear seat. Don’t forget to release the fuel pressure before removing the pump assembly. I think you will need a special tool to remove the pump assembly.
If you are going to test the fuel pressure you will need a fuel line adapter and a fuel pressure gauge. It should run 51psi. When checking this make sure you have no electrical items on (lights, radio AC etc.) that could give a false reading.
If you are going to test the fuel pressure you will need a fuel line adapter and a fuel pressure gauge. It should run 51psi. When checking this make sure you have no electrical items on (lights, radio AC etc.) that could give a false reading.
07-17-2007, 08:05 PM
#15
P1615- Engine immobilizer says you have the wrong key. Could check fuse 1, 19 and 21 (10 amps each) just in case.
A long shot but what is the voltage with engine is off (12.0-12.6V+) and engine running (14.2-14.6v)?
A long shot but what is the voltage with engine is off (12.0-12.6V+) and engine running (14.2-14.6v)?
10-26-2011, 05:38 PM
#18
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Join Date: Mar 2008
Location: maryland
Posts: 761
....so am a newbie and looking for help.
P304 code diagnosed, but something caught my eyes above.
- engine sounds like sucking more air when depress pedal, but lacking power.
- car jerked and struggled to go above 40 mph today. had to limp home (fail safe???).
where do i start to fix before buying and changing unnecessaries....?
plugs changed at 50k miles back, now at 160K miles.....
Valve body changed a month back
Cat replaced in summer...and more maintenace....
Help!!!
P304 code diagnosed, but something caught my eyes above.
- engine sounds like sucking more air when depress pedal, but lacking power.
- car jerked and struggled to go above 40 mph today. had to limp home (fail safe???).
where do i start to fix before buying and changing unnecessaries....?
plugs changed at 50k miles back, now at 160K miles.....
Valve body changed a month back
Cat replaced in summer...and more maintenace....
Help!!!
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