Popping At Idle - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

SRQ240 · 04-04-2017, 02:07 PM

Hi all! I've never posted on the forum before, so this'll be a first.
I'm also not the most experienced with engine work or familiar with names/specifications.
Anyway, I've got a 1993 Nissan 240sx Coupe with a KA24DE in it. It's naturally aspirated and the only things ever done to it were belt changes and fluid changes as well as a new fuel pressure regulator.
The problem that has just recently developed is a rough idle. I have no clue what it could be other than maybe the MAF (that's I've read), the Valve Cover Breather, or maybe the Timing/Distributor. I'm not sure how to check each thing or even if those are what is causing the issue.
When I start the car up, it idles fine around 700 (which is what it usually idled at before the problem so it's fine), but when I give it a little bit of gas, it comes back down and settles at 1400-ish RPM and I can just hear a continuous popping sound coming from the exhaust. The clutch also feels a bit stiffer now too.
My main concern is the popping and it only does it when the car comes to rest at an idle. The popping is pretty consistent, but I just don't know what it could be. Any help with explanations is greatly appreciated!
Thank You!

04-04-2017, 02:07 PM	#1
SRQ240 Join Date: Jan 2017 Location: Florida Posts: 7 Trader Rating: (0) Feedback Score: 0 reviews	Popping At Idle Hi all! I've never posted on the forum before, so this'll be a first. I'm also not the most experienced with engine work or familiar with names/specifications. Anyway, I've got a 1993 Nissan 240sx Coupe with a KA24DE in it. It's naturally aspirated and the only things ever done to it were belt changes and fluid changes as well as a new fuel pressure regulator. The problem that has just recently developed is a rough idle. I have no clue what it could be other than maybe the MAF (that's I've read), the Valve Cover Breather, or maybe the Timing/Distributor. I'm not sure how to check each thing or even if those are what is causing the issue. When I start the car up, it idles fine around 700 (which is what it usually idled at before the problem so it's fine), but when I give it a little bit of gas, it comes back down and settles at 1400-ish RPM and I can just hear a continuous popping sound coming from the exhaust. The clutch also feels a bit stiffer now too. My main concern is the popping and it only does it when the car comes to rest at an idle. The popping is pretty consistent, but I just don't know what it could be. Any help with explanations is greatly appreciated! Thank You!