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


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Old 08-26-2008, 07:16 AM   #1
s13hatchback
 
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SR SR bucking problem but no codes!

I just swapped my redtop into another chassis and now the car starts bucking bad when i ease into the throttle, but it doesnt happen at wife open throttle.Mods are...

redtop
z32 maf(new)
greddy fmic
fujita intake (PoS)
Walbro pump

I put the boost back down to stock until i figure this out. The MAF is new as are the plugs and O2 sensor. The ECU is showing 55 no problems. I checked for boost leaks and intakes leaks and nothing. Anyone have similar issues or have had in the past i would greatly appreciate the help. Also the plugs are fine(beige color) and there was no fuel smell when i took them out.
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Old 08-26-2008, 07:25 AM   #2
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is your ECU mapped for the Z32 MAFS?
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Old 08-26-2008, 08:29 AM   #3
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its a stock #62 ecu
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Old 08-26-2008, 08:39 AM   #4
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the #62 ecu is designed for a redtop SR MAF, not a z32 MAF. if your are using a Z32 MAF in an ecu that it was not dseigned for, you need some type of air/fuel controller like the ap;exi AFC, or a reflash of your ECU..

or get yourself the right MAF, or a SOHC KA24E maf.
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Old 08-26-2008, 08:48 AM   #5
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my bad thought i put that in there... i have an safc2
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Old 08-26-2008, 08:56 AM   #6
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so did you configure the safc2 to compensate for the z32 maf?

the settings are all over this forum.
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Old 08-26-2008, 09:21 AM   #7
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i thought it was 2 in 10 out hot wire..
i may be wrong..but thats what i thought.
check that out and see what happens
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Old 08-26-2008, 09:46 AM   #8
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you recirculated or no?
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Old 08-26-2008, 10:17 AM   #9
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no not recirc. it an hks ssqv
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Old 08-26-2008, 10:23 AM   #10
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double check that maf/wiring..granted it may be new, but defects to happen. double check all the wiring you did..make sure nothing is loose, it really sounds like the maf is cutting out/not getting a signal.
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Old 08-26-2008, 10:35 AM   #11
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check the voltages, im not sure if they are displayed on your safc, but get in there with a volt meter
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Old 08-26-2008, 12:38 PM   #12
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I believe it is displayed when you go to sensor check on the safc, though i dont know which one it is. If anyone does plz let me know...

if it is sensor 1. it is at 1.1V at idle

2 is at .25 at idle
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Old 08-26-2008, 01:50 PM   #13
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like i said the car idles fine but when i give it slight throttle it starts cutting out and bucking. then when i get to about 3500 rpms it runs fin again under a decent amount of throttle
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Old 08-26-2008, 03:36 PM   #14
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I just spent a few hours checking everything and the maf reads 1.25V when at idle and the boost gauge sits at zero even when the car is at idle. when i give it gas it starts to read vacuum until i hit boost and it reads the boost just fine.

Anyone have any other ideas?
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Old 08-27-2008, 08:54 AM   #15
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Quote:
Originally Posted by s13hatchback View Post
when i give it gas it starts to read vacuum until i hit boost and it reads the boost just fine.

Anyone have any other ideas?
wth? vacuum leak maybe? Mine sits at 19-21inHG at idle
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Old 08-27-2008, 09:47 AM   #16
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sounds like u has a major vac. leak - ^^^ 0wn3r's numbers are what u should be reading - Goodluck
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Old 08-27-2008, 10:44 AM   #17
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damn I'm sorry bro I had that same problem and it turned out to be the fuel pump sock I know it sounds strange but try it. g/l
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Old 08-27-2008, 11:06 AM   #18
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Haha how can no one mention GROUNDS. Check your grounds, from the MAF to the body, from the ignition harness (coilpacks) to the head, to the body, and from the ECU to the body. That's much more likely to be the problem than SAFC settings, because your car idles correctly.
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