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Tech Talk Technical Discussion About The Nissan 240SX and Nissan Z Cars


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Old 01-16-2014, 05:23 PM   #1
zlab
 
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stock sr20det running lean under load

iv searched and running out of ideas hope someone on here will be able to shine some light on something i over looked its a sr20det with boltons car starts and runs fine i have a apexi turbo timer a/f read 14.00 @1000k once its warm ill go for a drive i dont even get to 1psi of boost and it reads 20.00 on the a/f pulled plugs they are all light white no boost leaks i could hold 10 psi no problem

cleaned and checked maf 2v signal wire 12v power wire (thinking of re grounding )the negative

checked tps .40 closed 4.5volts wot

fuel pressure 43psi tomie frp adjustable ill give it a quick flip of the throttle and it goes up havent checked under load as the frp is under the hood
walbro pump
my fuel pump is hardwired with its own relay

02voltge stays @.78-80v @1k under load goes down to .01volts

vacuum @1k is 20in

put the fogger on the exhust only fog came out of the wate gate dump tube not sealing complete

have a apexi avcr injector duty is 85% at 1k

coolant temp sensor havent checked but my cluster shows temp so i assume it running correct

kinda stuck thanks in advance for your taking your time to read my post any help is appreciated
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Old 01-16-2014, 05:36 PM   #2
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Where is your wideband mounted at? How far down on the downpipe?
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Old 01-16-2014, 05:48 PM   #3
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You arnt that far from me. I could look at it if you drive to coconut creek one day. If the engine is mostly stock and going lean at WOT usually that is a sign of the fuel pump being inadequate.
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Old 01-16-2014, 05:54 PM   #4
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He doesn't have a wideband. Take off the FPR also and go back to a stock one you don't need an adjustable fpr.


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Old 01-16-2014, 06:48 PM   #5
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no wide band only 02 reading from the apexi turbo timer both a/f 02 volt is the only reference i have i just checked my maf signal wire and reads .80 with the key on searched around and some say i should read 1.2-2v dont know if thisis running or with the key in the on position
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Old 01-16-2014, 06:56 PM   #6
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when was the last time you changed your fuel filter?
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Old 01-16-2014, 07:12 PM   #7
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maybe 10miles on the fuel filter z32 and when i shut off the car and flip the switch on the fuel pump she rockets to 60 psi and i can hear the fuel rushing back when i start it goes down to 43psi
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Old 01-17-2014, 12:35 PM   #8
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problem fix my alt was slowly giving out on and off causing the pump to give out at w0t causing me to run lean thank for all the help
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Old 01-28-2014, 06:57 PM   #9
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bump turns out problem not fixed checked maf wires today and im getting 12v to the blk and white stripe wire ground is good and zero volts with key on to the signal wire (white wire) checked pin 16 signal input should i be reading .8 volts at pin 16 with key on ???
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Old 01-30-2014, 08:25 AM   #10
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Quote:
Originally Posted by zlab View Post
problem fix my alt was slowly giving out on and off causing the pump to give out at w0t causing me to run lean thank for all the help
why did you think it was the alt?
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Old 01-30-2014, 10:08 AM   #11
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i was getting 12.5 volts car running should have been 14v so i checked the volts coming directly out of the altornator and no volts.Replaced the alt and turned key to on position and decided to check the voltage specs on all my plugs everything checked out except the signal wire from the maf all white wire no voltage checked at the computer pin 16 got .80 then checked again and got nothing after a few more times still nothing got tired and just pulled the complete harness and going through it carefully.
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Old 01-30-2014, 10:21 AM   #12
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85% duty cycle, at 1000RPM, you say?

Isn't there something terribly wrong with that picture? It sounds like forget about your o2 and whatnot, and figure out why that is.

Is there a possibility that you have high impedence injectors, and an ecu setup for low impedence, so they're not getting enough juice to open?
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