Sr20det running lean under boost but drives fine HELP!!! - Page 2 - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

RussianSyndicate · 06-12-2015, 03:42 PM

Yeah you are right, it could run pig rich but at least it would be a temporary solution.

Crazyced · 06-22-2015, 02:02 PM

Did you bother checking fuel pressure at WOT?

ShooterMcGavin · 06-23-2015, 10:57 AM

My fuel pressure gauge is in the bay. Pressure rises when reving but haven't checked it at WOT.

Crazyced · 06-23-2015, 12:51 PM

Quote:

Originally Posted by ShooterMcGavin

My fuel pressure gauge is in the bay. Pressure rises when reving but haven't checked it at WOT.

That's what you have to do. It will tell you what you need to know. Run a line and gauge to your windshield and test.

htc.zenit · 07-27-2015, 03:18 AM

Any solution found to this problem?
Kinda having the same issues here...

Engine runs perfectly fine, but Plugs are white

Kingtal0n · 07-27-2015, 08:39 AM

Quote:

Originally Posted by htc.zenit

Any solution found to this problem?
Kinda having the same issues here...

Engine runs perfectly fine, but Plugs are white

lol, "help me! My plugs look perfect!"

Its so turrible! Quick what should I do to make my engine run like shit like everybody else!

cotbu · 07-28-2015, 10:28 AM

Lol, my plugs look like that after idling, but after a pull they're tan. Then clean themselves again during idle.

Sent from a Highly Tuned Note 4.5!!!

Crazyced · 08-10-2015, 09:12 AM

Widebands are quite a bit cheaper then engines guys.

89hatchman · 08-10-2015, 03:40 PM

Are all your exhaust gaskets upstream of the o2 sensor good? Any gasket that's bad can throw off the reading.

I honestly wouldn't even worry with a stock set up. I've found it's pretty hard for the engine to hurt itself at stock boost.

***dorkidori_s13*** · 08-10-2015, 03:53 PM

unplugging the MAF will put it into diagnostic mode, you wont be able to rev over 2500rpms.

if your 02 sensor is dead or not wired properly, it wont cause lean conditions at top end. the ECU goes into qusai-limp mode and dumps more fuel, so top end would be richer than usual.

i would HIGHLY advise you buying a consult port cable and getting your hands on a copy of NISTune. its one of the best diagnostic tools you can get for an OE ECU setup. unfortunately right now you cannot monitor your ECUs proper A/F ratios, injector duty cycles or timing. the stock injectors, ECU and MAF are terrible at dealing with bolt ons. my MAF and OE injectors are maxed out completely at 6500rpms on my S15 turbo with only 12psi of boost.

lean conditions CAN be caused by a leak BEFORE the turbo (after the MAF). what kind of tbolt clamps and couplers are you using? are you SURE youre not pulling air post MAF, pre turbo? unmetered air can cause REALLY annoying lean conditions (leaks post turbo will cause rich conditions btw)

PS: your plugs look fine for a pretty much stock SR.

914Slide · 11-26-2016, 07:15 AM

Quote:

Originally Posted by dorkidori_s13

unplugging the MAF will put it into diagnostic mode, you wont be able to rev over 2500rpms.

if your 02 sensor is dead or not wired properly, it wont cause lean conditions at top end. the ECU goes into qusai-limp mode and dumps more fuel, so top end would be richer than usual.

i would HIGHLY advise you buying a consult port cable and getting your hands on a copy of NISTune. its one of the best diagnostic tools you can get for an OE ECU setup. unfortunately right now you cannot monitor your ECUs proper A/F ratios, injector duty cycles or timing. the stock injectors, ECU and MAF are terrible at dealing with bolt ons. my MAF and OE injectors are maxed out completely at 6500rpms on my S15 turbo with only 12psi of boost.

lean conditions CAN be caused by a leak BEFORE the turbo (after the MAF). what kind of tbolt clamps and couplers are you using? are you SURE youre not pulling air post MAF, pre turbo? unmetered air can cause REALLY annoying lean conditions (leaks post turbo will cause rich conditions btw)

PS: your plugs look fine for a pretty much stock SR.

I had a bad "leak" after the maf a breather can was put in line and it was sucking tons of unmeasured air now it wont go back to normal. My plugs look like this white as can be.

07-28-2015, 10:28 AM	#37
cotbu Post Whore! Join Date: Sep 2005 Location: SWFL Age: 47 Posts: 3,318 Trader Rating: (3) Feedback Score: 3 reviews	Lol, my plugs look like that after idling, but after a pull they're tan. Then clean themselves again during idle. Sent from a Highly Tuned Note 4.5!!! __________________ LoverTechnologies "Half Broken Things!"

08-10-2015, 03:53 PM	#40
*dorkidori_s13* ITS LISA'S FAULT!!! Join Date: Jun 2003 Location: Las Vegas Age: 39 Posts: 7,331 Trader Rating: (41) Feedback Score: 41 reviews	unplugging the MAF will put it into diagnostic mode, you wont be able to rev over 2500rpms. if your 02 sensor is dead or not wired properly, it wont cause lean conditions at top end. the ECU goes into qusai-limp mode and dumps more fuel, so top end would be richer than usual. i would HIGHLY advise you buying a consult port cable and getting your hands on a copy of NISTune. its one of the best diagnostic tools you can get for an OE ECU setup. unfortunately right now you cannot monitor your ECUs proper A/F ratios, injector duty cycles or timing. the stock injectors, ECU and MAF are terrible at dealing with bolt ons. my MAF and OE injectors are maxed out completely at 6500rpms on my S15 turbo with only 12psi of boost. lean conditions CAN be caused by a leak BEFORE the turbo (after the MAF). what kind of tbolt clamps and couplers are you using? are you SURE youre not pulling air post MAF, pre turbo? unmetered air can cause REALLY annoying lean conditions (leaks post turbo will cause rich conditions btw) PS: your plugs look fine for a pretty much stock SR. __________________ Bought something from me??? POST A REVIEW HERE!!!

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06-12-2015, 03:42 PM	#31
RussianSyndicate Join Date: Jun 2015 Location: RUS Age: 30 Posts: 21 Trader Rating: (0) Feedback Score: 0 reviews	Yeah you are right, it could run pig rich but at least it would be a temporary solution.

06-22-2015, 02:02 PM	#32
Crazyced Zilvia Junkie Join Date: Apr 2015 Location: Ottawa Posts: 378 Trader Rating: (1) Feedback Score: 1 reviews	Did you bother checking fuel pressure at WOT?

06-23-2015, 10:57 AM	#33
ShooterMcGavin Join Date: Jan 2015 Location: Illinois Age: 25 Posts: 14 Trader Rating: (0) Feedback Score: 0 reviews	My fuel pressure gauge is in the bay. Pressure rises when reving but haven't checked it at WOT.

07-27-2015, 03:18 AM	#35
htc.zenit Join Date: Aug 2012 Location: Germany Age: 32 Posts: 21 Trader Rating: (0) Feedback Score: 0 reviews	Any solution found to this problem? Kinda having the same issues here... Engine runs perfectly fine, but Plugs are white

08-10-2015, 09:12 AM	#38
Crazyced Zilvia Junkie Join Date: Apr 2015 Location: Ottawa Posts: 378 Trader Rating: (1) Feedback Score: 1 reviews	Widebands are quite a bit cheaper then engines guys.

08-10-2015, 03:40 PM	#39
89hatchman Zilvia Member Join Date: Dec 2012 Location: In the west Posts: 295 Trader Rating: (0) Feedback Score: 0 reviews	Are all your exhaust gaskets upstream of the o2 sensor good? Any gasket that's bad can throw off the reading. I honestly wouldn't even worry with a stock set up. I've found it's pretty hard for the engine to hurt itself at stock boost.