Turbo Backfiring

bryanf89 · 06-12-2010, 04:29 PM

i changed my exhaust system to a 3in downpipe, test pipe and a blitz cat back...the car runs fine but when the turbo builds up pressure, that when i get a jerk...the gauge used to read at -4, now it stays right above the 0mark, exactly above the 0 mark...the gauge was reading and i saw it go straight to above the 8mark...its weird because the turbo seems to be building up more pressure, but gets to a certain point where it starts backfiring and the car starts jerking...also the engine light goes on only when the turbo acts up

any ideas?

cre · 06-12-2010, 04:45 PM

yup, knock or a bad knock sensor. what diagnostic coss do you have? 52?

bryanf89 · 06-12-2010, 05:15 PM

Idk dude, i dont have the computer to tell me codes and mechanic doesnt have 1 for an 89

i changed a rod knouck sensor before, could it be the other 1, or is there more than 2?

reydio · 06-12-2010, 09:01 PM

See following link to check your codes:

http://cygnusx1.net/Supra/TechTips/e...ror_codes.aspx

And yes, there is 2 knock sensors for 7MGTE.

cre · 06-12-2010, 11:18 PM

If there's a code 52 the most common cause is bad wiring.

bryanf89 · 06-13-2010, 12:54 AM

if its not?

cre · 06-13-2010, 02:08 AM

Seriously?

bryanf89 · 06-13-2010, 04:23 AM

Sorry to doubt in you cre lol. How long have u been with supra's?

cre · 06-13-2010, 04:53 AM

Too long.

I took your question to mean that if you have a code 52 and it's not the wiring then what else would it be... the answer is on the same page as the diagnosis procedure reydio so kindly linked to: If not wiring then all that's left (with regard to that specific code) are the knock sensors and the ECU.

Have you even checked for codes yet or are we still speculating?

bryanf89 · 06-13-2010, 05:47 AM

still speculating...im going to do the paper clip thing and write down which codes i get...ill report back with that

06-12-2010, 04:29 PM	#1
bryanf89 3" Exhaust Join Date: Nov 2009 Location: NYC Posts: 231	Turbo Backfiring i changed my exhaust system to a 3in downpipe, test pipe and a blitz cat back...the car runs fine but when the turbo builds up pressure, that when i get a jerk...the gauge used to read at -4, now it stays right above the 0mark, exactly above the 0 mark...the gauge was reading and i saw it go straight to above the 8mark...its weird because the turbo seems to be building up more pressure, but gets to a certain point where it starts backfiring and the car starts jerking...also the engine light goes on only when the turbo acts up any ideas?

06-12-2010, 04:45 PM	#2
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	yup, knock or a bad knock sensor. what diagnostic coss do you have? 52? __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

06-12-2010, 11:18 PM	#5
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	If there's a code 52 the most common cause is bad wiring. __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

06-13-2010, 02:08 AM	#7
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	Seriously? __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

06-13-2010, 04:53 AM	#9
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	Too long. I took your question to mean that if you have a code 52 and it's not the wiring then what else would it be... the answer is on the same page as the diagnosis procedure reydio so kindly linked to: If not wiring then all that's left (with regard to that specific code) are the knock sensors and the ECU. Have you even checked for codes yet or are we still speculating? __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

06-12-2010, 05:15 PM	#3
bryanf89 3" Exhaust Join Date: Nov 2009 Location: NYC Posts: 231	Idk dude, i dont have the computer to tell me codes and mechanic doesnt have 1 for an 89 i changed a rod knouck sensor before, could it be the other 1, or is there more than 2?

06-12-2010, 09:01 PM	#4
reydio Intake Join Date: Dec 2009 Location: Pearl City, HI Posts: 33	See following link to check your codes: http://cygnusx1.net/Supra/TechTips/e...ror_codes.aspx And yes, there is 2 knock sensors for 7MGTE.

06-13-2010, 12:54 AM	#6
bryanf89 3" Exhaust Join Date: Nov 2009 Location: NYC Posts: 231	if its not?

06-13-2010, 04:23 AM	#8
bryanf89 3" Exhaust Join Date: Nov 2009 Location: NYC Posts: 231	Sorry to doubt in you cre lol. How long have u been with supra's?

06-13-2010, 05:47 AM	#10
bryanf89 3" Exhaust Join Date: Nov 2009 Location: NYC Posts: 231	still speculating...im going to do the paper clip thing and write down which codes i get...ill report back with that

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