PLEASE HELP! KA misfire - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

KAs14slider · 01-22-2007, 01:43 PM

Sorry for the lengthy post, but I thought more info would help in narrowing down the problem.

Hi guys. I have been having problems with my NA KA24de on my 96 s14 for about a week now and no one seems to know what is causing the problem. It started after a night of drifting in the rain. The car ran perfect all night. We get to my friend's house. I leave the car on idling for about 10 minutes then I pull out to leave and all of a sudden the car misfires and sounds like a wrx. For the next few days we tried many of the usual things such as replaced the plugs, wires, distributor cap and rotor. My old wires were bad so that helped a little. We also ran some ecu codes and ended up with error codes for the maf, misfire on cylinder #4, error for IAT sensor. So we thought it was the MAF and my IAT wires were bad so we got a MAF out of my friend's S14 and re-did the IAT sensor wiring. That didn't help and the car still threw the same codes. I ended up taking the car to a shop and they fixed it but not completely. They said they found a bad ground and also said that my timing was a little off so that all got fixed and now I can actually floor the car and it will run perfect but only some of the time. It misfires a lot from 2-3 k and sometimes up high at 5-6. But then other times it will just misfire all through first gear on full throttle. Basically it's kind of random and runs flawless sometimes so it's really strange. It seems to be fine when I floor it at higher gears and worse on lower gears.
I was wondering if this might just be a bad ecu? We reset the ECU and it didn't help. Also I can unplug my 02 sensor and the car will run the same.
Or is it something like injectors, fuel pump, etc.?

If anyone has any help or suggestions, please let me know

Thanks, Alex

s13silvia123 · 01-22-2007, 10:51 PM

o2 sesnor or spark plugs might be the problem. if and only if you can smell your car running rich

slowmovingvehicle · 01-23-2007, 12:55 AM

same thing happened to me. at a stop light the car just started acting up. i felt my car shaking, car sounded really weird so i pulled over to check what was wrong. didnt know, so just drove it back home. make a long story short, found out my 4th injector was misfiring so i changed that out and put in another one. my car ran better after, had to re-time my engine cause i fooled around with alot of stuff. hope this helps.

84GTSR5 · 01-23-2007, 02:13 AM

I had the same problem before, i found out that my 2nd injector was misfiring. I put alot of that lucas fuel injector cleaner and it hasan't acted up any more.
Check your injectors and replace them if possible, that will probably solve your problem.

01-22-2007, 01:43 PM	#1
KAs14slider Zilvia Junkie Join Date: Mar 2005 Location: State College, PA Posts: 471 Trader Rating: (2) Feedback Score: 2 reviews	PLEASE HELP! KA misfire Sorry for the lengthy post, but I thought more info would help in narrowing down the problem. Hi guys. I have been having problems with my NA KA24de on my 96 s14 for about a week now and no one seems to know what is causing the problem. It started after a night of drifting in the rain. The car ran perfect all night. We get to my friend's house. I leave the car on idling for about 10 minutes then I pull out to leave and all of a sudden the car misfires and sounds like a wrx. For the next few days we tried many of the usual things such as replaced the plugs, wires, distributor cap and rotor. My old wires were bad so that helped a little. We also ran some ecu codes and ended up with error codes for the maf, misfire on cylinder #4, error for IAT sensor. So we thought it was the MAF and my IAT wires were bad so we got a MAF out of my friend's S14 and re-did the IAT sensor wiring. That didn't help and the car still threw the same codes. I ended up taking the car to a shop and they fixed it but not completely. They said they found a bad ground and also said that my timing was a little off so that all got fixed and now I can actually floor the car and it will run perfect but only some of the time. It misfires a lot from 2-3 k and sometimes up high at 5-6. But then other times it will just misfire all through first gear on full throttle. Basically it's kind of random and runs flawless sometimes so it's really strange. It seems to be fine when I floor it at higher gears and worse on lower gears. I was wondering if this might just be a bad ecu? We reset the ECU and it didn't help. Also I can unplug my 02 sensor and the car will run the same. Or is it something like injectors, fuel pump, etc.? If anyone has any help or suggestions, please let me know Thanks, Alex

01-22-2007, 10:51 PM	#2
s13silvia123 Post Whore! Join Date: May 2006 Location: where waldo is Age: 43 Posts: 3,267 Trader Rating: (16) Feedback Score: 16 reviews	o2 sesnor or spark plugs might be the problem. if and only if you can smell your car running rich __________________ 18g and 20g turbo users click on me http://zilvia.net/f/tech-talk/261219-18g-20g-turbo-users.html

01-23-2007, 12:55 AM	#3
slowmovingvehicle Leaky Injector Join Date: Aug 2006 Location: Hawaii Posts: 81 Trader Rating: (0) Feedback Score: 0 reviews	same thing happened to me. at a stop light the car just started acting up. i felt my car shaking, car sounded really weird so i pulled over to check what was wrong. didnt know, so just drove it back home. make a long story short, found out my 4th injector was misfiring so i changed that out and put in another one. my car ran better after, had to re-time my engine cause i fooled around with alot of stuff. hope this helps.

01-23-2007, 02:13 AM	#4
84GTSR5 Zilvia Junkie Join Date: Apr 2006 Location: Azusa Ca. Posts: 332 Trader Rating: (1) Feedback Score: 1 reviews	I had the same problem before, i found out that my 2nd injector was misfiring. I put alot of that lucas fuel injector cleaner and it hasan't acted up any more. Check your injectors and replace them if possible, that will probably solve your problem.