No high rpm?

gomezmk · 12-26-2006, 02:01 AM

I have a problem with my 87 supra that was a na body with a jdm 7mgte installed. For some reason the motor just does not like to rev pass 5,000 rpm, it's just not pulling anymore. I suspect either a bad ecu, or a ignitor. It does it under load and also in neutral(its a 5 speed). I did basically bought everything on ebay to convert it to turbo. The coils ohmed out ok. The afm is ok because I hit fuel cut once and the fuel cut works off the afm. I know for sure I don't have a boost leak. I installed a FCD, I currently running 11 psi.

Isphius · 12-26-2006, 02:12 AM

Check codes!! it is probably a plugged cat though. check that out. Take your oxygen sensor out and drive around and see if its any better.

gomezmk · 12-26-2006, 02:23 AM

I have no codes, no cat and why would the oxygen sensor cause anything if the ecu ignores the o2 sensor under wide open throttle.

kwnate · 12-27-2006, 02:13 AM

Check your plugs, fuel filter and fuel pump.

Staceman · 12-27-2006, 01:52 PM

Quote:

Check your plugs, fuel filter and fuel pump.

X2, especially the filter / pump.

justin1642 · 12-27-2006, 04:12 PM

if it isn't any of the above possibly the knock sensor that caused power loss and caused my car to run funny before. could be a long shot though. good luck

12-26-2006, 02:01 AM	#1
gomezmk 3" Exhaust Join Date: Jul 2006 Location: Santa Rosa, CA Posts: 70	No high rpm? I have a problem with my 87 supra that was a na body with a jdm 7mgte installed. For some reason the motor just does not like to rev pass 5,000 rpm, it's just not pulling anymore. I suspect either a bad ecu, or a ignitor. It does it under load and also in neutral(its a 5 speed). I did basically bought everything on ebay to convert it to turbo. The coils ohmed out ok. The afm is ok because I hit fuel cut once and the fuel cut works off the afm. I know for sure I don't have a boost leak. I installed a FCD, I currently running 11 psi.

12-26-2006, 02:12 AM	#2
Isphius 500whp yet? Join Date: Nov 2005 Location: Long branch, NJ Posts: 1,006	Check codes!! it is probably a plugged cat though. check that out. Take your oxygen sensor out and drive around and see if its any better. __________________ Yay the supra assistant is gone!!! WEEE!!

12-27-2006, 02:13 AM	#4
kwnate SP58GT Join Date: Jul 2005 Location: USA Posts: 633	Check your plugs, fuel filter and fuel pump. __________________ Nate

12-27-2006, 04:12 PM	#6
justin1642 3" Exhaust Join Date: Mar 2006 Location: Michigan Posts: 213	if it isn't any of the above possibly the knock sensor that caused power loss and caused my car to run funny before. could be a long shot though. good luck __________________

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12-26-2006, 02:23 AM	#3
gomezmk 3" Exhaust Join Date: Jul 2006 Location: Santa Rosa, CA Posts: 70	I have no codes, no cat and why would the oxygen sensor cause anything if the ecu ignores the o2 sensor under wide open throttle.