Injector Seals went Bad while tuning my car

[whitefrs]

Originally Posted by mad_sb

Again, this engine has no bank 2 as far as OBD codes go so by all means check all 4 pugs and injectors. The problem could be on any of the cylinders if it is a localized problem and not something with the DI fuel delivery side.

Checking the plugs should help you determine the over all health of the motor as will checking all the injectors for seal integrity and injector tips for coloration etc.

My guess is if you have a bad injector it will be obvious when you compare the plug and injector to the other 3. One failed injector would be enough to max out the fuel trims since the others would have to compensate to maintain an average target afr in closed loop.

If all 4 are fairly uniform then you can start looking at something else like the DI driver box.

The thing is, those two codes together would indicate the Di system was not putting out enough fuel under closed loop DI only operation (which means low load on a boosted car) and even with the fuel trims maxed out the front 02 sensor was still seeing a lean condition.... Without seeing some logs all i have to go on is what JV said (ran fine on port only mode) and the rail pressure looked normal.. so that only leaves a few things... bad injector, bad injector driver box, clogged injector etc... I do think you would have a code if the injector driver box has an issue though.

When you ran into the issues at higher boost, did it still run good if you dropped the boost back down?

Thaks for the info

We didnt try at low boost after the misfire start happening

[mad_sb]

Just a quick correction / additional info... I cam across a manual section that was in relation to some VVT codes. It states that:

Bank 1 refers to the bank that includes the No. 1 cylinder*.
6/4/2012 10:29 PMFA20 ENGINE CONTROL: SFI SYSTEM: P0016-P0019: Crankshaft Pos...
7 of 10
https://techinfo.toyota.com/t3Portal...S0U/xhtml/RM00...
*: The No. 1 cylinder is the cylinder which is farthest from transmission.
Bank 2 refers to the bank that does not include the No. 1 cylinder.

However, I did not find any similar notes when looking up the DI codes you had. I still believe that in relation to the specific codes you got:
P117B Direct Injector Fuel Performance
P1171 Bank 1 too lean
the Bank 1 reference is meaningless, since there is no mention of P0174 (system too lean bank 2) or P0175 (system too rich bank2) in the service manual. Also, since there is only 1 primary 02 sensor there is no way for the system to differentiate between which "bank" is rich or lean.

[2forme]

Just out of curiosity, has there been any record of a Subaru dealer acknowledging this issue? All the instances I read of Subaru, have involved fighting with the dealer LOL. Good to know Scion at least takes care of their cars.

[whitefrs]

Originally Posted by mad_sb

Again, this engine has no bank 2 as far as OBD codes go so by all means check all 4 pugs and injectors. The problem could be on any of the cylinders if it is a localized problem and not something with the DI fuel delivery side.

Checking the plugs should help you determine the over all health of the motor as will checking all the injectors for seal integrity and injector tips for coloration etc.

My guess is if you have a bad injector it will be obvious when you compare the plug and injector to the other 3. One failed injector would be enough to max out the fuel trims since the others would have to compensate to maintain an average target afr in closed loop.

If all 4 are fairly uniform then you can start looking at something else like the DI driver box.

The thing is, those two codes together would indicate the Di system was not putting out enough fuel under closed loop DI only operation (which means low load on a boosted car) and even with the fuel trims maxed out the front 02 sensor was still seeing a lean condition.... Without seeing some logs all i have to go on is what JV said (ran fine on port only mode) and the rail pressure looked normal.. so that only leaves a few things... bad injector, bad injector driver box, clogged injector etc... I do think you would have a code if the injector driver box has an issue though.

When you ran into the issues at higher boost, did it still run good if you dropped the boost back down?

Just got a work of my tech.
Spark plugs are good he says

[mad_sb]

Any Updates?

[whitefrs]

Originally Posted by mad_sb

Any Updates?

still checking but they are wondering why is there white smoke coming out and a sweet smell at start up

hopefully is not coolant contamination

[mad_sb]

Originally Posted by whitefrs

still checking but they are wondering why is there white smoke coming out and a sweet smell at start up

hopefully is not coolant contamination

ugg, sounds like a head gasket

[whitefrs]

Originally Posted by mad_sb

ugg, sounds like a head gasket

why would the head gasket go bad?

also can this cause a misfire?

[jamesm]

Originally Posted by whitefrs

why would the head gasket go bad?

also can this cause a misfire?

Detonation?

[Frs300]

Originally Posted by whitefrs

still checking but they are wondering why is there white smoke coming out and a sweet smell at start up

hopefully is not coolant contamination

check the oil see if it looks milky or discolored as well as the coolant. hopefully they did that already. they also make an exhaust gas tester you can hook up to check for coolant that way as well. but ya white smoke and sweet smell sounds like a head gasket

[mad_sb]

Originally Posted by whitefrs

why would the head gasket go bad?

also can this cause a misfire?

Head lift (weak head bolts, too much boost, detonation), Material failure, poor factory seal, etc.

Yes, coolant in the chamber will certainly cause a misfire.

[mad_sb]

Originally Posted by Frs300

check the oil see if it looks milky or discolored as well as the coolant. hopefully they did that already. they also make an exhaust gas tester you can hook up to check for coolant that way as well. but ya white smoke and sweet smell sounds like a head gasket

Yeah, the tester is the best way for sure. Sometimes they start by only leaking a little bit under high load, not enough to detect visually in the oil etc.. but the gas tester never lies.

[nelsmar]

So its been a while since this was updated... any progress?

[mike the snake]

So, I'm planning on getting FI soon. Anything I should tell my tuner to do, or check, to make sure I don't have any DI issues?

If i go with this tuner, I believe this will be the first FRS/BRZ that they have done a turbo install/tune on, so I want to be armed with as much info as possible. I've already noted things like the fuel pump install (O-rings and spacer) but if there's anything else they should look for, or avoid, I'd love to know before hand.