p0301 missfire issue, UPDATE - TriStateTuners.com :: Home of Tristate Auto Enthusiast

JSpecV03 · 10-01-2008, 11:57 PM

ok so i recently had some issues with my car that i worked out. i had to replace my pre cat so i threw some 4-2-1 headers on my car, and installed a hi-flow cat BEHIND my downstream o2. the upstream is on the header itself. my car is throwing a p0420 for cataylist low effeiency. i clear the code and every 3rd drive cycle the MIL (CEL) comes back on. so i understand whats going on here. i used an anti folwer on my downstream o2

but the main problem im having here is a p0301 cycl. 1 missfire. i check my plugs and they are find with a nominal gap of 1.1mm (0.043in). i swaped 1 and 3 coil packs around and the problem is still in no 1. at WOT around 4-5k rpm it feels like the car is struggling for power, and bucks a little bit. then a flasing mil comes on for a min and then goes off. ive cycled 2 bottles of fuel injector cleaner through it and no change. so i think my injector is shot but im still not sure if thats it.

so is there anyway that the p0420 code is affecting this po301 missfire in cycl. 1? or are the 2 totally unrelated?
help would be great guys

05OCsrt-4 · 10-02-2008, 05:51 AM

either change your plugs, or its a fuel delivery problem, possibly injectors
and most likily the p0420 isn't causing your p0301

JSpecV03 · 10-02-2008, 09:35 AM

ok cuz thats what i was thinking its my injectors.

Buster · 10-02-2008, 09:58 AM

I had the same problem in my spec v, swap cyl 1 and cyl 2 injectors and see if the problem moves the cyl 2. if it does you found your problem.

HQuakers · 10-02-2008, 10:48 AM

Like everyone said, swap out injectors, plugs, plug wires to another cylinder and see if it changes. Check to see if the connections are all tight.

JSpecV03 · 10-02-2008, 02:43 PM

Quote:

Originally Posted by Buster

I had the same problem in my spec v, swap cyl 1 and cyl 2 injectors and see if the problem moves the cyl 2. if it does you found your problem.

what did you do to fix, just swap around your injectors?

Buster · 10-03-2008, 11:11 AM

my misfire was in #4 so I took #3 and #4 and swapped them and the misfire moved to #3. Its pretty simple, while You have the intake mani off check to see if all your butterfly screws are still in or loctite them.

JSpecV03 · 10-04-2008, 12:38 AM

Quote:

Originally Posted by Buster

my misfire was in #4 so I took #3 and #4 and swapped them and the misfire moved to #3. Its pretty simple, while You have the intake mani off check to see if all your butterfly screws are still in or loctite them.

i pulled the intake collector off a few weeks ago, when my car was running ****ty and i found the no. 4 cycl. had its valve and screws missing. so i sent the car off to nissan and they did a inspection on everything and put it all back together. i swaped the coils around, i even swapped injectors around, i performed a power balance test and it came back ok,
so im wandering if now its an ignition problem, or worse case senario something internal.

JSpecV03 · 10-04-2008, 12:39 AM

bump for update.

cburwell · 10-04-2008, 08:07 PM

The valve and the screws were missing on cylinder 4 and Nissan didn't replace your engine? EEK!

Have you done what people have suggested about swapping the injectors? If you put the cylinder 1 injector to cylinder 2 and the misfire appears on cylinder 2, then you can be fairly certain that it is the injector. If that is the case, then hop on the Sentra forums and try to find someone with a set of stock injectors.

JSpecV03 · 10-05-2008, 07:19 PM

Quote:

Originally Posted by cburwell

The valve and the screws were missing on cylinder 4 and Nissan didn't replace your engine? EEK!

Have you done what people have suggested about swapping the injectors? If you put the cylinder 1 injector to cylinder 2 and the misfire appears on cylinder 2, then you can be fairly certain that it is the injector. If that is the case, then hop on the Sentra forums and try to find someone with a set of stock injectors.

the engine itself wasnt damaged to the point that i needed to replace it. besdies im outa warrenty anyway and dont have like 5 k laying around for a new motor. but its my cycl 1 thats missfiring.
i tried the injector swap and i got nothing. its still missing on cycl 1.
i think it might be an ignition related issue

10-01-2008, 11:57 PM	#1
JSpecV03 Tri-State Post Whore Join Date: Nov 2007 Location: Lansdale, Pa Member #6345 My Ride: 2006 Acura TSX,1996 Jeep Cherokee Sport 4x4 4.0, and cammed out Spec V with a blown motor. iTrader: (1)	p0301 missfire issue, UPDATE ok so i recently had some issues with my car that i worked out. i had to replace my pre cat so i threw some 4-2-1 headers on my car, and installed a hi-flow cat BEHIND my downstream o2. the upstream is on the header itself. my car is throwing a p0420 for cataylist low effeiency. i clear the code and every 3rd drive cycle the MIL (CEL) comes back on. so i understand whats going on here. i used an anti folwer on my downstream o2 but the main problem im having here is a p0301 cycl. 1 missfire. i check my plugs and they are find with a nominal gap of 1.1mm (0.043in). i swaped 1 and 3 coil packs around and the problem is still in no 1. at WOT around 4-5k rpm it feels like the car is struggling for power, and bucks a little bit. then a flasing mil comes on for a min and then goes off. ive cycled 2 bottles of fuel injector cleaner through it and no change. so i think my injector is shot but im still not sure if thats it. so is there anyway that the p0420 code is affecting this po301 missfire in cycl. 1? or are the 2 totally unrelated? help would be great guys __________________ 1996 Jeep Cherokee Sport 4x4 4.0 work horse 2003 Nissan Sentra Se-R Spec V, needs a motor. 2006 Acura TSX, soon to be low and slow. Every Nasty Vehical Illustrates Our Useless Spending Last edited by JSpecV03; 10-04-2008 at 12:39 AM.

10-03-2008, 11:11 AM	#7
Buster TST Ruined My Life! Join Date: May 2005 Location: Holland Pa Member #449 My Ride: 2008 Mustang GT/CS iTrader: (3)	my misfire was in #4 so I took #3 and #4 and swapped them and the misfire moved to #3. Its pretty simple, while You have the intake mani off check to see if all your butterfly screws are still in or loctite them. __________________ III To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.

10-04-2008, 12:39 AM	#9
JSpecV03 Tri-State Post Whore Join Date: Nov 2007 Location: Lansdale, Pa Member #6345 My Ride: 2006 Acura TSX,1996 Jeep Cherokee Sport 4x4 4.0, and cammed out Spec V with a blown motor. iTrader: (1)	bump for update. __________________ 1996 Jeep Cherokee Sport 4x4 4.0 work horse 2003 Nissan Sentra Se-R Spec V, needs a motor. 2006 Acura TSX, soon to be low and slow. Every Nasty Vehical Illustrates Our Useless Spending

10-04-2008, 08:07 PM	#10
cburwell Tri-State Post Whore Join Date: Apr 2005 Member #303 iTrader: (0)	The valve and the screws were missing on cylinder 4 and Nissan didn't replace your engine? EEK! Have you done what people have suggested about swapping the injectors? If you put the cylinder 1 injector to cylinder 2 and the misfire appears on cylinder 2, then you can be fairly certain that it is the injector. If that is the case, then hop on the Sentra forums and try to find someone with a set of stock injectors. __________________ To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures. - To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures. To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures. "The Corvette took nearly 25 years to sell 500,000 units; the Z does it in fewer than 10."

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10-02-2008, 09:35 AM	#3
JSpecV03 Tri-State Post Whore Join Date: Nov 2007 Location: Lansdale, Pa Member #6345 My Ride: 2006 Acura TSX,1996 Jeep Cherokee Sport 4x4 4.0, and cammed out Spec V with a blown motor. iTrader: (1)	ok cuz thats what i was thinking its my injectors. __________________ 1996 Jeep Cherokee Sport 4x4 4.0 work horse 2003 Nissan Sentra Se-R Spec V, needs a motor. 2006 Acura TSX, soon to be low and slow. Every Nasty Vehical Illustrates Our Useless Spending

10-02-2008, 09:58 AM	#4
Buster TST Ruined My Life! Join Date: May 2005 Location: Holland Pa Member #449 My Ride: 2008 Mustang GT/CS iTrader: (3)	I had the same problem in my spec v, swap cyl 1 and cyl 2 injectors and see if the problem moves the cyl 2. if it does you found your problem. __________________ III To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.

10-02-2008, 10:48 AM	#5
HQuakers Tri-State Addict Join Date: Feb 2008 Location: Haddon Twp, NJ Member #6849 My Ride: 97 Jeep Cherokee iTrader: (0)	Like everyone said, swap out injectors, plugs, plug wires to another cylinder and see if it changes. Check to see if the connections are all tight.