Motor Misfire SR20 - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

speedracer5 · 09-11-2012, 08:47 PM

K here is the story i got back from vacation (2weeks) and the car ran fine the first day but the 2nd day started acting up. when i take off (normal driving) it studders and after getting up at mid range RPMs it runs fine.

I Found out one of the cylinders is not firing from what ive checked.

1.What i have done. ive pulled the injectors while idleing they work cause car starts to die DUH.

2.Pulled the pigtails from coil packs at idle all but one dosnt effect the motor.

thats where im stuck cause i pulled that coil pack out checked it even swapped with another one still when i pulled the pig tail nothing.

im thinking its either the coilpack harness pigtail or the sparkplugs. lmk what you think. Spark plugs have been ordered just waiting for them to come in.

Also there is no smoke or white coming out the exhaust.

if ur in OCEANSIDE and want to stop by to see if u can help LMK

Turtle · 09-11-2012, 09:35 PM

Check resistance on faulty injector... Try swapping the coilpack from the dead cyl to a known working one and see if its the coil pack to blame. If the same cyl then doesnt work then possibly bad injector. Report back.

speedracer5 · 09-11-2012, 09:59 PM

I did the coil pack check and it was still doing the same thingon that one cylinde. i even tried unplugging the injectors while running the injectors r good

rwtf · 09-11-2012, 10:02 PM

just because you unplugged the injector doesn't mean its still good.

speedracer5 · 09-11-2012, 10:05 PM

How woukd be a good way to check it

Turtle · 09-11-2012, 10:40 PM

check if you're getting voltage to that cyl from the pigtail. If not check where the source voltage should be coming. Just trace back.

4x4le · 09-12-2012, 05:18 AM

Ignitor chip is a possibility too. Ive seen them test good when they are known bad on more than one occasion which puzzles me.

09-11-2012, 08:47 PM	#1
speedracer5 Post Whore! Join Date: Oct 2010 Location: SO CAL Age: 36 Posts: 2,603 Trader Rating: (24) Feedback Score: 24 reviews	Motor Misfire SR20 K here is the story i got back from vacation (2weeks) and the car ran fine the first day but the 2nd day started acting up. when i take off (normal driving) it studders and after getting up at mid range RPMs it runs fine. I Found out one of the cylinders is not firing from what ive checked. 1.What i have done. ive pulled the injectors while idleing they work cause car starts to die DUH. 2.Pulled the pigtails from coil packs at idle all but one dosnt effect the motor. thats where im stuck cause i pulled that coil pack out checked it even swapped with another one still when i pulled the pig tail nothing. im thinking its either the coilpack harness pigtail or the sparkplugs. lmk what you think. Spark plugs have been ordered just waiting for them to come in. Also there is no smoke or white coming out the exhaust. if ur in OCEANSIDE and want to stop by to see if u can help LMK __________________

09-11-2012, 09:59 PM	#3
speedracer5 Post Whore! Join Date: Oct 2010 Location: SO CAL Age: 36 Posts: 2,603 Trader Rating: (24) Feedback Score: 24 reviews	I did the coil pack check and it was still doing the same thingon that one cylinde. i even tried unplugging the injectors while running the injectors r good __________________

09-11-2012, 10:02 PM	#4
rwtf Zilvia Addict Join Date: Jun 2011 Location: Maryville, TN Age: 33 Posts: 830 Trader Rating: (3) Feedback Score: 3 reviews	just because you unplugged the injector doesn't mean its still good. __________________

09-11-2012, 10:05 PM	#5
speedracer5 Post Whore! Join Date: Oct 2010 Location: SO CAL Age: 36 Posts: 2,603 Trader Rating: (24) Feedback Score: 24 reviews	How woukd be a good way to check it __________________

09-11-2012, 09:35 PM	#2
Turtle Zilvia Member Join Date: Jul 2007 Location: California Age: 32 Posts: 221 Trader Rating: (0) Feedback Score: 0 reviews	Check resistance on faulty injector... Try swapping the coilpack from the dead cyl to a known working one and see if its the coil pack to blame. If the same cyl then doesnt work then possibly bad injector. Report back.

09-11-2012, 10:40 PM	#6
Turtle Zilvia Member Join Date: Jul 2007 Location: California Age: 32 Posts: 221 Trader Rating: (0) Feedback Score: 0 reviews	check if you're getting voltage to that cyl from the pigtail. If not check where the source voltage should be coming. Just trace back.

09-12-2012, 05:18 AM	#7
4x4le Zilvia FREAK! Join Date: Nov 2008 Location: Manchester, Tn Posts: 1,253 Trader Rating: (1) Feedback Score: 1 reviews	Ignitor chip is a possibility too. Ive seen them test good when they are known bad on more than one occasion which puzzles me.