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Damn P 170

werx

Proven Member
81
2
Jan 19, 2007
Hendersonville, Tennessee
I'm trying to pass emissions but the car keeps throwing a P170 code: fuel trim Malfunction. I'm not sure which way to go to fix the problem. I'm running stock injectors but I've installed a walbro 255 fuel pump and have 6AN line running from the fuel filter to the fuel rail. I'm also running a Fuel Lab AFPR adjusted to 42.5. I have a 2G Eagle Talon AWD with 6bolt swap and JDM Cyclone intake.
 

werx

Proven Member
81
2
Jan 19, 2007
Hendersonville, Tennessee
i replaced the upstream o2 sensor and it thru the code even faster!
 

shakeandbake

Proven Member
91
6
Aug 9, 2012
Flourtown, Pennsylvania
Im just gonna state it so its out there. But boost leaks cause this. Has this been a constant code?
 

werx

Proven Member
81
2
Jan 19, 2007
Hendersonville, Tennessee
If it's a boost leak it's not in the usual places (silicone couplers, intercooler, MAF etc..). I think it's coming from the throttle body but I'm not sure how to test for it. Then again it maybe the gauge. I conveniently have a spare so I try that.
 

MJcanada

10+ Year Contributor
3,131
68
Jun 25, 2011
Inman, South_Carolina
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[DOUBLEPOST=1415161908][/DOUBLEPOST]Try the diag chart. Did you check you o2 operation before replacing it? What exactly are you fuel trims? 0 never changing? way positive? way Negative?
 

Calan

DSM Wiseman
7,252
339
Jan 16, 2007
OKC, Oklahoma
If it's a boost leak it's not in the usual places (silicone couplers, intercooler, MAF etc..). I think it's coming from the throttle body but I'm not sure how to test for it. Then again it maybe the gauge. I conveniently have a spare so I try that.

The throttle body is a usual place for a boost leak. If you are testing it properly, it will show up there (usually around the shaft seals) as easily as it will anywhere else.
 

mercaholik

Proven Member
465
49
Mar 1, 2014
Warwick, Rhode_Island
Wait you have a 2g with 6 bolt swap so do you have your barometric sensor hired up? The 2g ecu will be looking for it and in mjcanada's post it shows failed baro as a possible cause for the code. And the throttle body has a couple of places to leak, shaft seals, isc gasket, biss screw and o-ring, fiav gasket. Do you have a stock 2g ecu and a way to log and tune?
 

werx

Proven Member
81
2
Jan 19, 2007
Hendersonville, Tennessee
Sorry it took so long to reply. So let's start at the top. Yes I have a stock 96 ECU, I fixed the code by reworking the EGR valve... Code went away but it's now throwing up a P1105. Found out that's a fuel pressure solenoid malfunction. Needless to say, I bought a new solenoid. Between the new solenoid and tightening all hose connected to the fuel pressure solenoid, I hope to finally be done with all these B&%%[email protected]!t emission codes
 

werx

Proven Member
81
2
Jan 19, 2007
Hendersonville, Tennessee
Well it fixed the P1105 problem but I come to find out that my 96 Mitsubishi ECU will never pass emissions because of a programing flaw in the ECU. My city's emission czar won't exempt me from emissions because there was a recall almost 15 yrs ago. So I'm in the process of getting a flashable ecu from another year.
 
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