S14 SR20DET Weird Misfire/Idle after Warm only when revved past 3k - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

grizzly8181 · 05-27-2020, 10:47 PM

Having an issue with an s13 redtop in an s14
Car runs perfectly fine while it is cold and warming up however after about 15 minutes of driving it will do this
Once car is warmed up if i rev it above 3k and then it?ll want to die when it comes down and won?t let me accelerate almost like it?s in limp mode, unplugging cylinder 1 returns it back to normal and it runs perfectly fine, if I rev above 3k again it does the same thing

Issue started randomly one day on the freeway, it just backfired super loud and bogged down like that

Video showing issue

https://youtu.be/NOqH37UZpj8

S14rebuild · 05-28-2020, 08:50 AM

Check coil packs, ignitor

grizzly8181 · 05-28-2020, 09:40 PM

Quote:

Originally Posted by S14rebuild

Check coil packs, ignitor

Did some more testing today whenever this is occuring only cylinder 4 is sparking. 3,2,1 are no longer sparking. So the engine is only running on cylinder 4. This cutout typically happens during higher rpm like past 3k itll just suddenly cut out and start running on cylinder 4. I can wait a while to restart the car and itll run fine on all 4 again. This cutout will only happen after the car has ran for a bit, when it is cold i can rev it to anything and it will be fine.
Is this pointing to a bad ignitor? Or bad ecu?

NukeKS14 · 05-29-2020, 06:10 AM

Or wiring. Check your coil pack harness. Pull it and inspect everything. Could be some insulation rubbed off/nicked and is shorting out.

grizzly8181 · 05-29-2020, 08:07 AM

Quote:

Originally Posted by NukeKS14

Or wiring. Check your coil pack harness. Pull it and inspect everything. Could be some insulation rubbed off/nicked and is shorting out.

If it were more wiring related though wouldn?t it be doing it all the time instead of only after the car runs for a while? On cold starts I can rev it to anything and it never does this but drive around for 5-10 minutes and any high rev will cause it to only fire on cylinder 4. I’m going to check the signal from the ecu and igniter to make sure that is still going through.

NukeKS14 · 05-29-2020, 10:00 PM

Quote:

Originally Posted by grizzly8181

If it were more wiring related though wouldn?t it be doing it all the time instead of only after the car runs for a while?.

Not necessarily. If its nicked or making incidental contact when it gets jostled from the engine moving it wont be all of the time. Just something easy to check and rule out. I had a similar issue from my coil pack harness grounding out intermittently from a small nick on the timing loop.

grizzly8181 · 05-30-2020, 12:06 AM

Quote:

Originally Posted by NukeKS14

Not necessarily. If its nicked or making incidental contact when it gets jostled from the engine moving it wont be all of the time. Just something easy to check and rule out. I had a similar issue from my coil pack harness grounding out intermittently from a small nick on the timing loop.

Solved the issue! Ignitor was bad, got it replaced and it?s all good now

05-27-2020, 10:47 PM	#1
grizzly8181 Join Date: May 2020 Location: Anaheim Age: 22 Posts: 4 Trader Rating: (0) Feedback Score: 0 reviews	S14 SR20DET Weird Misfire/Idle after Warm only when revved past 3k Having an issue with an s13 redtop in an s14 Car runs perfectly fine while it is cold and warming up however after about 15 minutes of driving it will do this Once car is warmed up if i rev it above 3k and then it?ll want to die when it comes down and won?t let me accelerate almost like it?s in limp mode, unplugging cylinder 1 returns it back to normal and it runs perfectly fine, if I rev above 3k again it does the same thing Issue started randomly one day on the freeway, it just backfired super loud and bogged down like that Video showing issue https://youtu.be/NOqH37UZpj8

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05-28-2020, 08:50 AM	#2
S14rebuild BANNED Join Date: May 2019 Location: Florida-FAIL Posts: 2,497 Trader Rating: (8) Feedback Score: 8 reviews	Check coil packs, ignitor

05-29-2020, 06:10 AM	#4
NukeKS14 Zilvia Member Join Date: Apr 2019 Location: KS Posts: 221 Trader Rating: (1) Feedback Score: 1 reviews	Or wiring. Check your coil pack harness. Pull it and inspect everything. Could be some insulation rubbed off/nicked and is shorting out.