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.

is your ECU mapped for the Z32 MAFS?

its a stock #62 ecu

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.

my bad thought i put that in there... i have an safc2

so did you configure the safc2 to compensate for the z32 maf?

the settings are all over this forum.

yes i did 2 in 6 out hot wire

4cyl with arrow to the northeast

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

you recirculated or no?

no not recirc. it an hks ssqv

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.

check the voltages, im not sure if they are displayed on your safc, but get in there with a volt meter

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

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

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?

wth? vacuum leak maybe? Mine sits at 19-21inHG at idle

sounds like u has a major vac. leak - ^^^ 0wn3r's numbers are what u should be reading - Goodluck

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

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.