hard starting, rough lumpy idle, running rich, backfiring..help - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

RpSinner · 09-24-2005, 11:49 PM

before the only problem i had is that if i didnt let the car warm up enough it would die.

now its having problems starting...like it takes a few cranks. and when its running the idle goes between 400 to 900 and its a bit lumpy. also between shifts or after revving it it will backfire and shoot a flame out.

i was thinking it might be either o2 sensor or timing or both....

you guys got any ideas?

PROJECTRB240SX · 09-25-2005, 01:10 AM

classic bad o2... sounds like its stuck in the lean position and the car is running rich. I'm having this same problem.

rancid240 · 09-26-2005, 11:06 AM

also check the ECT, engine coolant temp sensor, look it up in search.

Nautious1 · 09-26-2005, 11:49 AM

also check your throttle position sensor (TPS). Check your timing to adjust the running rich problem.

09-24-2005, 11:49 PM	#1
RpSinner Zilvia Member Join Date: Apr 2004 Location: SF bay area Posts: 277 Trader Rating: (0) Feedback Score: 0 reviews	hard starting, rough lumpy idle, running rich, backfiring..help before the only problem i had is that if i didnt let the car warm up enough it would die. now its having problems starting...like it takes a few cranks. and when its running the idle goes between 400 to 900 and its a bit lumpy. also between shifts or after revving it it will backfire and shoot a flame out. i was thinking it might be either o2 sensor or timing or both.... you guys got any ideas?

09-25-2005, 01:10 AM	#2
PROJECTRB240SX Zilvia Junkie Join Date: Dec 2003 Location: GILBERT, AZ Posts: 304 Trader Rating: (0) Feedback Score: 0 reviews	classic bad o2... sounds like its stuck in the lean position and the car is running rich. I'm having this same problem. __________________ IF I AM TYPING IN CAPS (LIKE NOW) I AM SORRY BECAUSE I AM AT WORK (DATA ENTRY) AND I HAVE NO CAPS LOCK BUTTON AND NO WAY TO CHANGE MY UPPER CASE LETTERING. SORRY!

09-26-2005, 11:06 AM	#3
rancid240 Post Whore! Join Date: Jan 2002 Location: Irvine CA Posts: 2,770 Trader Rating: (72) Feedback Score: 72 reviews	also check the ECT, engine coolant temp sensor, look it up in search.

09-26-2005, 11:49 AM	#4
Nautious1 Join Date: Nov 2003 Location: Hawaii Age: 47 Posts: 1 Trader Rating: (0) Feedback Score: 0 reviews	also check your throttle position sensor (TPS). Check your timing to adjust the running rich problem.