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Need some expert advice on ecu codes

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Swarley815

10+ Year Contributor
35
0
Oct 19, 2011
Dixon, Illinois
Ok let me start with what I have. 97 eclipse gsx. Mods include big 16g, 550's, walboro 255, big fmic, greddy Tyre rs recirculated, injen intake,apexi safc, buschur exhaust with cat delete. For some reason the the car runs really rich. Like 150-175 to a full tank of 93 octane. Check engine light is on and its giving multiple codes....p1105 ,p0125,p0136,p0141,p0400. I replaced the ect sensor cleared all codes by unhooking battery and they came back. Fuel pressure solenoid is my next option but not available through local parts store. I don't think the other codes will cause running rich but I'm not sure. Do I need to run afpr with the walboro 255? And I don't have rear 02 sensor. Any help would be appreciated!
 
The AFPR is something you should have so you can make sure you are set at the correct FP when using the larger pump. It's not completely needed but not something you should ignore however.

FPS, temp sensor, 2 for the rear o2 sensor, and the EGR valve.

Did you remove emissions? You don't need the FPS but it will give you a code if it's either bad or unplugged.
 
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My bad....i should of been more specific. I am aware of what the codes are but what i should of asked is, will any of these codes cause rich conditions? I have not deleted emissions but i am def planing on it. I dont have emission tests here so that cat is already gone.
 
As I stated before I already changed the temp sensor. I also changed thermostat and made sure its filled properly. I was under the impression that the 02 sensor codes were because of the rear one not being there. Is one of those codes for the front 02 sensor?
 
Please excuse my information, I didn't notice "sensor 2" under the code description. So you are correct, it's the rear sensor throwing the 2 codes.


You should look into a wideband to get a better judgement on your fuel trims. I'm guessing you do not have any logging software?

I would start with a boost leak test as that will alter your trims.
 
I beleive what liquidx was tring to say is 2 of your codes that you got were the front o2 sensor. Hope that will help.

I beleive what liquidx was tring to say is 2 of your codes that you got were the front o2 sensor. Hope that will help.

I stand corrected as well.
 
Well I do have some parts about to go on the car, OEM 4 layer headgasket,arp headstuds,hks272's, Manley springs and retainers,3g lifters,valve stem seals,aem wideband,OEM timing belt and balance shaft belt,gates water pump,act streetlite flywheel,arp flywheel bolts,Clutchnet Kevlar solid disk with 2600 pp. I was a little concerned about the codes before I started in the build. I've had the parts for a month and I'm itching to get it going but I want it to be up to par first! Also with the fuel mileage I'm getting, I'm sure the wideband would read full rich with the possible exception of wot with 20 psi. As far as logging goes I don't have the means just yet but I did message a guy today on here about buying his link setup.....hopefully he gets back to me soon
 
You can get away with not having an aftermaket FPR for awhile before the fuel pressure will eventually overcome the stock one and oval it out causing to much fuel. Also a stuck closed EGR or by eliminating the EGR esentially the same as being stuck closed will cause a rich condtion, but most likely not something you will notice. Personally I would just eliminate the thing and if you upgrade to link you can do it without having to deal with it throwing a code same with the FPS.
 
I would do the build. I'm assuming you are getting both the block and head properly surfaced for the MLS gasket?
 
Yes sir! I've done my homework about the head gasket and definitely don't want to do it twice. Thanks a lot guys for your info....definitely appreciated!
 
Thats good! keep it up you seem to have a good parts list going. I would make sure to add a new OEM oil pump to your list if you havent already. Other than that I would say go ahead with your build. ECM Link is extreamly worth it, if you can get your hands on it.
 
Ok for a little update......all parts are in the car! Def found some boost leaks! Tps sensor was not even tight! missing a bolt in map sensor and manifold to turbo gasket was shot! I drove 57 miles to friends shop to do the build and filled up with 93 right before i left and was at a half tank when i got there! Compression was 167 171 168 170, pretty happy with that. Build went pretty good and took about 12 hours to do it with a few breaks. Drove home and used less than a 1/8 of a tank! Boost leaks were killing me. I ordered a fuel lab afpr kit and should b here tomorrow. Im sure that will help also.
 
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