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Old 06-12-2010, 05:29 PM   #1
bryanf89
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Default 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?
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Old 06-12-2010, 05:45 PM   #2
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yup, knock or a bad knock sensor. what diagnostic coss do you have? 52?
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Old 06-12-2010, 06:15 PM   #3
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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?
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Old 06-12-2010, 10:01 PM   #4
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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.
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Old 06-13-2010, 12:18 AM   #5
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If there's a code 52 the most common cause is bad wiring.
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Old 06-13-2010, 01:54 AM   #6
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if its not?
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Old 06-13-2010, 03:08 AM   #7
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Seriously?
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Old 06-13-2010, 05:23 AM   #8
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Sorry to doubt in you cre lol. How long have u been with supra's?
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Old 06-13-2010, 05:53 AM   #9
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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?
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Old 06-13-2010, 06:47 AM   #10
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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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