Fixed a bad injector that was causing missfire but now new problem...

[240SETulsa]

Okay so after 2 and a half hours of wrenching I finally get the dang injector out. Its obviously the original becuz I have never seen an injector be so stubborn. So I got it replaced and while I was at it I noticed that the hose going to the aem cold air intake was kinked bad so I removed it and cut it to size. It starts and runs pretty good now but I did recognize one odd thing. Whenever I accelerate or decelerate (in terms of rpm up or down) when the tach hits between 1000-1300 ( sometimes a few hundred rpm more depending on how hard i rev it) it seems to change its note ever so breifly (almost like it bogs) and slow its decent/accent. Once it gets past that it is back to normal. I thought maybe the idle or timing might be a tad off but idk.

Any help would be great

91 240sx KA DOHC

[PapaSmurf2k3]

Check your engine grounds, I had a similar problem when mine (towards the back of the head and runs to the firewall) had rotted through.

You also might have a lazy O2 sensor or something, or your map is still kinda funky from the bad injector. Try unplugging the ECU for 10 mins or so to reset the ECU.

[240SETulsa]

Check your engine grounds, I had a similar problem when mine (towards the back of the head and runs to the firewall) had rotted through.

You also might have a lazy O2 sensor or something, or your map is still kinda funky from the bad injector. Try unplugging the ECU for 10 mins or so to reset the ECU.

Thanks Ill try the ecu thing tonight.