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3sgte No Boost & hesitation - 6G Celicas Forums

Topic #92528 4 posts Started by cjh4l22
2nd gen 3sgte swap is hesitating and won't boost.
Got 3 codes - 35, 43 & 71. MAP sensor, Starter sensor & EGR valve.
Retried removing MAP, no change.
Replace MAP sensor, no change.
No EGR since swap, hasn't been a problem, understand code 71.
Starter sensor? Could be causing rough startup as it says its not feeding a signal to the fuel pump. OK, but car starts fine.

No boost, not in any gear, not free reving, never. I can hear the turbo spool but nothing. VAC/Boost sensor only gets to 0.
Perhaps wastegate stuck open? Bad ECU? no major upgrades (fmic), should be in-time, only 12k miles on the swap. rebuilt engine has been running great, no overheating, no other abnormalities.

All help is appreciated.

proud =3sgte SWAPPED= '95 Celica ST owner [calling it the GT2 or half-trac]309,000 miles n' ....dead-> ALIVE AGAIN!! ~14,000 miles driven
who did the wiring? you could be missing signals the ECU need or the circuit opening relay.

typically when you dont make any boost the wastegate is stuck open. take the turbo off and check the wastegate.

2001 Celica GT-S Turbo1997 Supra TT 6speed1997 Celica 3MZ/1MZ swap1990 Celica All-Trac
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QUOTE (Smaay @ Apr 22, 2014 - 9:34 AM) *
>who did the wiring? you could be missing signals the ECU need or the circuit opening relay.

typically when you dont make any boost the wastegate is stuck open. take the turbo off and check the wastegate.


PNP harness done by Tweak'd/Phoenix Tuning.

That makes sense. I wonder if its stuck. Maybe I can smack it once to have it work temporarily and if all is ok, I can go ahead and replace it.

Anyone else have any thoughts?

proud =3sgte SWAPPED= '95 Celica ST owner [calling it the GT2 or half-trac]309,000 miles n' ....dead-> ALIVE AGAIN!! ~14,000 miles driven
take a look at the wastegate actuator, see if it moves freely. try to pull it in. you could also blow air into the vacuum port and see if it opens.

2001 Celica GT-S Turbo1997 Supra TT 6speed1997 Celica 3MZ/1MZ swap1990 Celica All-Trac