P1320 causing lean condition? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

flip240 · 08-20-2008, 12:45 AM

I've been feeling a slight hesitation when the car is warmed up, so i checked my plugs and they are running very lean. There is a white powder coating the tips of all 4 spark plugs.

I've been running the exact same setup for more than a few years now;
- 8.8CR pistons
- BKR7ES plugs gapped to 0.032"
- GT32 at 12psi
- JWT 50# program with Cobra MAFS and Walbro 255

The only code that is sticking out is a P1320 which is a failure in the primary ignition system. I looked up the resolution in the FSM EC-107, and narrowed it down to a possible short in the condensor/resistor wiring for the distributor system. I honestly don't know what these components do, but I haven't been able to track down the short as of yet. Do these components alter the ignition timing possibly causing the engine to run lean?

I haven't touched anything on the car so I'm guessing it's a failure of some component, possibly the MAFS, but there hasn't been a code thrown for that?

jspeedm · 08-24-2008, 08:51 PM

if the plugs aren't firing properly they wont burn all the fuel and the o2 will read a rich mixture and lean it out.

08-20-2008, 12:45 AM	#1
flip240 Join Date: Jan 2003 Location: Chicago Posts: 41 Trader Rating: (2) Feedback Score: 2 reviews	P1320 causing lean condition? I've been feeling a slight hesitation when the car is warmed up, so i checked my plugs and they are running very lean. There is a white powder coating the tips of all 4 spark plugs. I've been running the exact same setup for more than a few years now; - 8.8CR pistons - BKR7ES plugs gapped to 0.032" - GT32 at 12psi - JWT 50# program with Cobra MAFS and Walbro 255 The only code that is sticking out is a P1320 which is a failure in the primary ignition system. I looked up the resolution in the FSM EC-107, and narrowed it down to a possible short in the condensor/resistor wiring for the distributor system. I honestly don't know what these components do, but I haven't been able to track down the short as of yet. Do these components alter the ignition timing possibly causing the engine to run lean? I haven't touched anything on the car so I'm guessing it's a failure of some component, possibly the MAFS, but there hasn't been a code thrown for that?

08-24-2008, 08:51 PM	#2
jspeedm Nissanaholic! Join Date: Jul 2008 Location: SoCal 562 Age: 45 Posts: 1,680 Trader Rating: (26) Feedback Score: 26 reviews	if the plugs aren't firing properly they wont burn all the fuel and the o2 will read a rich mixture and lean it out.