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Old 11-15-2017, 12:13 AM   #1
Philphilphil
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Default How to perform egt sensor resistor directly on the ECU

Hi everyone, so I'm having differents issues on a car I bought (06 impreza n/a with a 07 STI engine). The car is hesitating at idle, and mostly under load but also does it before hitting the boost. The engine is from 07 STI but ECU is from an 04 forester xt and injectors are yellow side feed apparently from the forester xt.
First question: how can I perform the egt sensor mod since I have the STI harness (no egt sensor connector). I guess I can do it right on the ecu with the pinout I just found?
Second question: does running with no egt sensor connected will only throw a CEL or could it be the cause of the engine hesitating?
I did check all my vaccum lines and intercooler/wastegate, changed turbo inlet tube for a stock one, changed pcv valve, changed spark plugs and ordered a new upstream O2.
Any help is highly appreciated!! Been reading alot and trying different things but the car is still not running good.
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Last edited by Philphilphil; 11-15-2017 at 01:02 AM.
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Old 11-15-2017, 12:34 AM   #2
Blktrax
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Ok, let's clarify...

This is a 2006 Impreza or a 2006 WRX?

With a 2007 STi engine?

And a Forester XT ECU of an unknown year?!
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Old 11-15-2017, 12:59 AM   #3
Philphilphil
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Quote:
Originally Posted by Blktrax View Post
Ok, let's clarify...

This is a 2006 Impreza or a 2006 WRX?

With a 2007 STi engine?

And a Forester XT ECU of an unknown year?!
My bad sorry I was in a hurry when I wrote it down. So 2006 impreza n/a with a 07 STI engine and 04 forester xt ECU and injectors
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Old 11-15-2017, 01:13 AM   #4
stu
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2003 OFCDV3 GTX35R
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So a forester XT. the engines are almost identical. I would do a compression test. Did you check the engine before you installed it? How long has it been in your car.
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Old 11-15-2017, 03:06 AM   #5
Philphilphil
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Originally Posted by stu View Post
So a forester XT. the engines are almost identical. I would do a compression test. Did you check the engine before you installed it? How long has it been in your car.
I bought the car already swapped. The seller told me the engine was hesitating since her ex-boyfriend installed a vf34 but that it was running fine before. She said He never took the time to fix it afterward. So the car was overboosting at that moment (wrong restrictor pill) and I thought there was a vaccum/boost leak from something not connected properly after the turbo swap. I got the car running strong at one point so I would be really surprised the compression would be bad. Also starts like a champ when cold. Warm starts take longer.
ECU is throwing 4 codes:
P0031 heater control circuit low bank1 sensor1
P0244 turbocharger wastegate solenoid "a" range/performance
P0546 exaust gaz temperature sensor circuit high bank 1 sensor 1
P0600 serial communication link.
So I want to first eliminate the CELs/problems one by one. I believe the wastegate code is thrown because it overboosted before I installed a MBC. I already ordered my O2 sensor (even if it codes just for the heater). Now wanna get rid of the EGT one.
So can the EGT code make my engine run bad or is it just a CEL?
A forester xt runs about 11psi and an STI 15psi, can that affects? (Car hesitates even @ lower boost).
Thanks alot for your time, I am lost with this issue and need help!
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Old 11-15-2017, 03:10 AM   #6
Philphilphil
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Also I had a problem that seems related to the TPS this week. Got the pedal not responding when cruising. Stopped the car. Started it after couple of seconds. Worked again. I experiences this few times even after cleaning up contacts on the plugs with contact cleaner. Tomorrow I will hook up the reader to see what's the TPS reading.

Last edited by Philphilphil; 11-15-2017 at 10:30 AM.
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Old 11-16-2017, 01:49 PM   #7
Philphilphil
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Okay so I installed the resistor directly on the ECU. I plugged the scanner this morning and the egt code is gone. Now my throttle position is 14% @closed throttle and 76% @WOT, how can I check my pedal and tp on throttle body?
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