Bpu 1JZ Breaking up Underboost...Help
#1
Bpu 1JZ Breaking up Underboost...Help
Okay guys my car has been breaking up lately...& for some reason i cannot figure out what is causing it...the car idles, and drives perfect..but under boost at WOT around 13psi or more it startes to break up.
I have a 94 Sc300 with a 1JZ 5speed...
I have already changed the plugs, n gapped them to .028 i used Oem Denso Double Platinum plugs,i put in a Walbro 255,i did a 12volt Mod,i checked the coilpacks, & it all seems to be fine.
I kno its not boost cut because i have a Greddy Boost Cut & Speed Cut Controllers wired in aswell besides when u hit boost cut, u will get a CEL for about 2 secs or so, i checked for Codes and atm the car isnt throwing any, so im pretty SOL,
im wondering if the car just needs to be tuned, my car is completely stock jus BPU, stock injectors,stock turbos,etc
Please help!!
I have a 94 Sc300 with a 1JZ 5speed...
I have already changed the plugs, n gapped them to .028 i used Oem Denso Double Platinum plugs,i put in a Walbro 255,i did a 12volt Mod,i checked the coilpacks, & it all seems to be fine.
I kno its not boost cut because i have a Greddy Boost Cut & Speed Cut Controllers wired in aswell besides when u hit boost cut, u will get a CEL for about 2 secs or so, i checked for Codes and atm the car isnt throwing any, so im pretty SOL,
im wondering if the car just needs to be tuned, my car is completely stock jus BPU, stock injectors,stock turbos,etc
Please help!!
#5
Lexus Test Driver
iTrader: (9)
Maybe try non platinum, NGK BKR7E (#6097)
Try .026 and if it doesnt work keep going down to the lower 20s
Also, you might pull your ecu fuse as well so that the ecu might relearn with the colder weather as a basis.
How's the fuel filter?
Was the car able to boost before or is this a new problem?
Try .026 and if it doesnt work keep going down to the lower 20s
Also, you might pull your ecu fuse as well so that the ecu might relearn with the colder weather as a basis.
How's the fuel filter?
Was the car able to boost before or is this a new problem?
#6
Maybe try non platinum, NGK BKR7E (#6097)
Try .026 and if it doesnt work keep going down to the lower 20s
Also, you might pull your ecu fuse as well so that the ecu might relearn with the colder weather as a basis.
How's the fuel filter?
Was the car able to boost before or is this a new problem?
Try .026 and if it doesnt work keep going down to the lower 20s
Also, you might pull your ecu fuse as well so that the ecu might relearn with the colder weather as a basis.
How's the fuel filter?
Was the car able to boost before or is this a new problem?
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#9
Lexus Test Driver
iTrader: (9)
When you switch to NGK 6097s, check the coil packs for cracks down the stems.
It's very common for them to get hairline cracks. You boost, the cracks open a hair and it arcs out and you break up. If they have cracks on the stems you can wrap them with electrical tape.
It's very common for them to get hairline cracks. You boost, the cracks open a hair and it arcs out and you break up. If they have cracks on the stems you can wrap them with electrical tape.
#10
I double checked the coil packs today, and i saw 2 wit very lil thin cracks, like u said hairline thin, but also i decided to regap the plugs again, from .028 to .025 and the car no longer breaks up, lets just hope that it stays this way and doesnt start breakin up again, i will get the WB in asap and keep the boost at 15psi