Trouble with 1JZ swap
#1
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Trouble with 1JZ swap
Hey,
Just did an engine swap to replace a running 1JZ in my SC400. The previous engine was running, but had spun a bearing. After the new engine, the car starts perfectly fine, however it will stumble when I start touching the throttle. It is a stock (1JZ) engine, but has the following:
-Borg Warner S360 Turbo, PN 177272, .91 A/R divided housing
-CXRacing thick walled 11ga Stainless header, with WG flange converted to 44/45mm V-band
-Turbosmart Hypergate 45mm Wastegate
-3" Stainless CXRacing downpipe w/2nd O2 bung added and BW Marmon flange welded on
-4" turbo 45* polished aluminum intake pipe
-AEM 320lph fuel pump
-Denso 650cc injectors
-Greddy Emanage Ultimate
-Greddy "T13" PNP Harness
It currently has -14 to -17 of vacuum at idle, and it is throwing a CEL code stating a knock sensor fault.
So does anyone have any thoughts? Is it the faulty knock sensor? A vacuum leak? Maybe an issue with the the wiring (there were a few things addressed in the swap)? Or is it Maybe just an issue with the fuel mapping with the piggyback?
Please let me know if you have any thoughts. Does anyone maybe a good base map for a 1JZ with the Greddy eManage?
I just want to get her going!
Thanks in advance!
Chris V.
Just did an engine swap to replace a running 1JZ in my SC400. The previous engine was running, but had spun a bearing. After the new engine, the car starts perfectly fine, however it will stumble when I start touching the throttle. It is a stock (1JZ) engine, but has the following:
-Borg Warner S360 Turbo, PN 177272, .91 A/R divided housing
-CXRacing thick walled 11ga Stainless header, with WG flange converted to 44/45mm V-band
-Turbosmart Hypergate 45mm Wastegate
-3" Stainless CXRacing downpipe w/2nd O2 bung added and BW Marmon flange welded on
-4" turbo 45* polished aluminum intake pipe
-AEM 320lph fuel pump
-Denso 650cc injectors
-Greddy Emanage Ultimate
-Greddy "T13" PNP Harness
It currently has -14 to -17 of vacuum at idle, and it is throwing a CEL code stating a knock sensor fault.
So does anyone have any thoughts? Is it the faulty knock sensor? A vacuum leak? Maybe an issue with the the wiring (there were a few things addressed in the swap)? Or is it Maybe just an issue with the fuel mapping with the piggyback?
Please let me know if you have any thoughts. Does anyone maybe a good base map for a 1JZ with the Greddy eManage?
I just want to get her going!
Thanks in advance!
Chris V.
#2
Lead Lap
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Do you have a wideband? If not, then get one. Every non stock car should have one. That would tell you if your mapping is off. It could be stumbling for a number of reasons. First thing is to fix what you know is wrong, so start with the vac leak. Then once you know if your fueling is correct under throttle via wideband, then you can cancel the fueling out. If there is a faulty knock sensor, that could be causing a pull in timing
#3
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Join Date: Aug 2017
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Do you have a wideband? If not, then get one. Every non stock car should have one. That would tell you if your mapping is off. It could be stumbling for a number of reasons. First thing is to fix what you know is wrong, so start with the vac leak. Then once you know if your fueling is correct under throttle via wideband, then you can cancel the fueling out. If there is a faulty knock sensor, that could be causing a pull in timing
Thanks again in advance!
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