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Turbonetics logo. The bottom port should be open. For the wastegate the fitting should be in the lower
port furthest from the red Turbonetics logo. The upper port should be open.
3. Check for boost leak at or after MAF
4. Verify throttle body is operating properly
5. Ensure the O2 sensor extender provided from Turbonetics is installed on the second factory O2 sensor.
The second O2 sensor is the one on the S pipe. The primary O2 sensor should be connected to the
Turbonetics supplied downpipe with no extender.
ECU throwing codes (misfire):
1. Verify the spark plugs are not fouled and are gapped appropriately
2. Remove the injector harness and remove the supplied barrel splices from the supplied pigtails and solder
the new injector pig tails to the factory injector harness
3. Verify the vacuum signal lines are going to the correct ports on the BOV and wastegate
4. Verify the O2 sensor extender provided by Turbonetics is installed on the second O2 sensor and not the
Primary
Car not building full boost:
1. Check for boost leaks
2. Verify boost signal line is in proper position on blow off valve (upper most port closest to logo)
3. Verify wastegate boost signal line is installed properly (lower port furthest from logo)
4. Check for exhaust leaks.
Black residue/soot in engine bay/turbo not spooling quickly:
1. Check flange connection on downpipe for any warping
2. Check wastegate recirculate tube for any cracks
3. If downpipe flange is not sealing check lower downpipe support bracket. On some Scion Tc the
tolerances are off and the lower flange does not properly line up with the threads in the block used to bolt
the flange to the motor. If this is the case you will need to elongate the lower flange mounting hole to
allow it to properly seat/bolt up without having to put excess pressure on the downpipe. A local exhaust
shop can do this or it can be done with a Dremel tool and metal cutting bit
4. If the wastegate recirculate tube is cracked it may be the result of excessive motor movement. On some
heavily drag raced Scion Tc’s we have evidence of excessively compliant motor mounts. The over
compliance of the motor mount cause the wastegate recirculate bellow to crack under the increased
strain. It is highly suggested the customer purchase and install an Ingalls Stiffy engine stabilizer brace if
frequent drag racing is planned.
Car running excessively rich:
1. Verify O2 extender is installed on secondary O2 sensor not the primary one.
Car detonating under boost:
1. Check boost pressure
2. Check fuel pressure
3. Verify injectors are installed properly
4. Verify air fuel ratio on dyno
Car smoking when coming off boost:
1. Oil drain line not installed properly
2. Oil drain not above oil level
