Odd lean condition - All fuel parts checked - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Pstl_pete · 07-20-2010, 03:16 PM

Before I get into the problem my brothers car is a stock S14 SR with an exhaust and filter, otherwise everything else is stock down to the side mount intercooler.

When we drive the car, if you tip into the gas anywhere from a 1/4 to 3/4, the car instantly dips into the low 16s AFR and you can feel it running lean. Same deal when you go full gas, it leans out the after 4000rpm it comes back to life and runs proper AFRs until redline.

I have double checked timing, done a compression test, replaced the fuel injectors, FPR, filter, and ECU with no improvement to the condition. Also have done a boost leak test.

Im really at a loss as to what the problem could be. Suggestions?

lok · 07-20-2010, 04:33 PM

any codes?

what maf?

Pstl_pete · 07-20-2010, 04:35 PM

Stock SR S14 MAF, no CE codes at all.

lok · 07-21-2010, 09:06 AM

Maybe the fuel pump is getting intermittent power.

Pstl_pete · 07-22-2010, 12:03 PM

Quote:

Originally Posted by lok

Maybe the fuel pump is getting intermittent power.

Good call, Im going to investigate that.

07-20-2010, 03:16 PM	#1
Pstl_pete Zilvia Junkie Join Date: Nov 2004 Location: LA,CA & Windsor, ON Posts: 443 Trader Rating: (4) Feedback Score: 4 reviews	Odd lean condition - All fuel parts checked Before I get into the problem my brothers car is a stock S14 SR with an exhaust and filter, otherwise everything else is stock down to the side mount intercooler. When we drive the car, if you tip into the gas anywhere from a 1/4 to 3/4, the car instantly dips into the low 16s AFR and you can feel it running lean. Same deal when you go full gas, it leans out the after 4000rpm it comes back to life and runs proper AFRs until redline. I have double checked timing, done a compression test, replaced the fuel injectors, FPR, filter, and ECU with no improvement to the condition. Also have done a boost leak test. Im really at a loss as to what the problem could be. Suggestions? __________________ S14 - New SR Project http://www.speed.academy

07-20-2010, 04:35 PM	#3
Pstl_pete Zilvia Junkie Join Date: Nov 2004 Location: LA,CA & Windsor, ON Posts: 443 Trader Rating: (4) Feedback Score: 4 reviews	Stock SR S14 MAF, no CE codes at all. __________________ S14 - New SR Project http://www.speed.academy

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07-20-2010, 04:33 PM	#2
lok Zilvia Addict Join Date: Jul 2003 Location: Oklahoma Posts: 816 Trader Rating: (10) Feedback Score: 10 reviews	any codes? what maf?

07-21-2010, 09:06 AM	#4
lok Zilvia Addict Join Date: Jul 2003 Location: Oklahoma Posts: 816 Trader Rating: (10) Feedback Score: 10 reviews	Maybe the fuel pump is getting intermittent power.