Trouble: Car runs extremely rich, won't idle. - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

95auto · 11-20-2006, 11:56 PM

I have a 1993 hatch with a stock KA, that was running fine until it started stumbling/missing at idle and running poorly.

I checked the plugs/wires/cap, and all were okay. The cylinder 1 is mis-firing, and I replaced the fuel injector with a spare that I had. It is odd as it was coming and going, however now, it is much more apparent, and is smoking a tremendous amount, and won't stay running. I've checked compression, and all cylinders have ~150psi cranking compression.

chmercer · 11-21-2006, 12:30 AM

leaky fuel injectors? check for damaged o rings

IngS14 · 11-21-2006, 12:54 PM

maybe bad fuel pressure regulator?instead of replace with an used factory one just get a nismo adjustable fpr then,like this.........http://cgi.ebay.com/ebaymotors/SR20D...mZ320009928926

aznpoopy · 11-21-2006, 02:43 PM

possibly

bad injector
bad injector wiring (grounded open)
bad injector o-ring and subsequent mis-installation (most likely)

95auto · 11-21-2006, 04:07 PM

wouldn't a bad injector O-ring leak? there are no leaks. It is running pig rich on all cylinders. I have even disconnected the spark plug/ injector from hole 1, and it still runs the exact same, meaning that the miss doesn't worsen, and the richness doesn't go away. Could the injector be stuck open?

11-20-2006, 11:56 PM	#1
95auto Join Date: Sep 2002 Posts: 36 Trader Rating: (0) Feedback Score: 0 reviews	Trouble: Car runs extremely rich, won't idle. I have a 1993 hatch with a stock KA, that was running fine until it started stumbling/missing at idle and running poorly. I checked the plugs/wires/cap, and all were okay. The cylinder 1 is mis-firing, and I replaced the fuel injector with a spare that I had. It is odd as it was coming and going, however now, it is much more apparent, and is smoking a tremendous amount, and won't stay running. I've checked compression, and all cylinders have ~150psi cranking compression.

11-21-2006, 12:54 PM	#3
IngS14 Zilvia Addict Join Date: Jul 2004 Location: DriftHeaven,CA Age: 45 Posts: 647 Trader Rating: (7) Feedback Score: 7 reviews	maybe bad fuel pressure regulator?instead of replace with an used factory one just get a nismo adjustable fpr then,like this.........http://cgi.ebay.com/ebaymotors/SR20D...mZ320009928926 __________________

11-21-2006, 12:30 AM	#2
chmercer BANNED Join Date: Jun 2003 Location: texas! Age: 39 Posts: 3,288 Trader Rating: (0) Feedback Score: 0 reviews	leaky fuel injectors? check for damaged o rings

11-21-2006, 02:43 PM	#4
aznpoopy Post Whore! Join Date: Mar 2003 Location: New Jersey Age: 44 Posts: 5,013 Trader Rating: (1) Feedback Score: 1 reviews	possibly bad injector bad injector wiring (grounded open) bad injector o-ring and subsequent mis-installation (most likely)

11-21-2006, 04:07 PM	#5
95auto Join Date: Sep 2002 Posts: 36 Trader Rating: (0) Feedback Score: 0 reviews	wouldn't a bad injector O-ring leak? there are no leaks. It is running pig rich on all cylinders. I have even disconnected the spark plug/ injector from hole 1, and it still runs the exact same, meaning that the miss doesn't worsen, and the richness doesn't go away. Could the injector be stuck open?