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Old 07-26-2013, 10:04 AM   #1
GRSSHPR1
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Default My boss doesn't believe me

So long story short I work at a shop in ohio and used to own a 2002 wrx and we received one today from a dealership it only has 45000 miles on it and possibly a junkyard motor barely any fuel in it and it has cel of p0102,p0113,p0171 I am extremely convinced that they put 87 in it and that's why there is no power until it reaches about 4500 rpms. He doesn't believe me and wants me to convince him otherwise that the car will run bad on 87 I've told him we need to put 91 in it to check. I made the same mistake with my car when I had it. please help thanks guys
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Old 07-26-2013, 10:08 AM   #2
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just show him the handbook. All turbo subaru's require 91 at the minimum.

Run the tank down, refill. reset the ecu take it for a gentle 50 mile drive.
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Old 07-26-2013, 10:09 AM   #3
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Old 07-26-2013, 10:15 AM   #4
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So you think that 8 octane gas is responsible for no low/mid range power, but yet, the car still makes decent power up top?

If they car was pulling timing, it would be just as bad, if not worse the higher in the rev-range you are.
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Old 07-26-2013, 10:44 AM   #5
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it's an automatic and wot it's a dog until it reaches higher rpm then it takes off. but we see junkyard marker on the intake which concerns me we're looking for a specifics description of how the ecu realizes what octane is in it. anyone?
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Old 07-26-2013, 10:52 AM   #6
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Quote:
Originally Posted by GRSSHPR1 View Post
it's an automatic and wot it's a dog until it reaches higher rpm then it takes off. but we see junkyard marker on the intake which concerns me we're looking for a specifics description of how the ecu realizes what octane is in it. anyone?
the ecu doesn't know octane directly, it knows by repetitive knock and adjusts accordingly by pulling timing and lowering the IAM from 16 to OMG its blown.
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Old 07-26-2013, 10:59 AM   #7
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ok so I guess the question is will putting a low octane like 87 make it go into somewhat of a limp mode?
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Old 07-26-2013, 11:01 AM   #8
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Quote:
Originally Posted by GRSSHPR1 View Post
ok so I guess the question is will putting a low octane like 87 make it go into somewhat of a limp mode?
It will make it run like ****, but mainly at higher rpm, not at lower rpm.

Those codes could mean your MAF is toast/unplugged/has damaged wiring/installed backwards. What direction is the clip on the MAF pointed/do you have a known good one you can swap in?
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Old 07-26-2013, 11:04 AM   #9
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ok well i'm getting him to put higher octane in it right now and we'll see if that cures it lol let's hope for me because if i'm right I get a full tank of gas lmao
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Old 07-26-2013, 11:27 AM   #10
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Originally Posted by GRSSHPR1 View Post
ok well i'm getting him to put higher octane in it right now and we'll see if that cures it lol let's hope for me because if i'm right I get a full tank of gas lmao
How exactly does bad gas cause a MAF, IAT, and a fuel trim too lean code?

I'd be looking for pre turbo leaks and faulty maf sensors before I'd be worried about the gas.
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Old 07-26-2013, 11:27 AM   #11
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Quote:
Originally Posted by GRSSHPR1 View Post
ok well i'm getting him to put higher octane in it right now and we'll see if that cures it lol let's hope for me because if i'm right I get a full tank of gas lmao
Reset the ECU after you fill up and see if the codes come back
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Old 07-26-2013, 11:31 AM   #12
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I'm 99% sure it's not the octane. If it was a fuel issue (delivery, quality, octane), you'd see more issues in the higher RPMs than lower.

From those codes you give, all three are pointing to the intake area. Looks like there are incorrect A/F ratios down low in 'closed loop' from a MAF issue, leading to it running lean and not having power. Above 3Kish is 'open loop', where things like the front O2 sensor are not contributing to the A/F ratio. I'm not 100% sure if the MAF is contributing here to calculations.

Either way, I'd say it's not an octane or fuel issue at all. Looks to be a bad MAF or front O2 sensor. I'd point more towards the MAF considering the MAF specific code.
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Old 07-26-2013, 11:56 AM   #13
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so it made a huge difference of say you were sitting at 50 mph and wot it it takes off like a rocket which it didn't before but it still has what feels like lag off a dead stop. erased codes and none have come back on yet and I reset the ecu by disconnecting the battery and touching the terminals together before I started it with the new gas. which was 93
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Old 07-26-2013, 12:09 PM   #14
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Quote:
Originally Posted by Psychoreo View Post
It will make it run like ****, but mainly at higher rpm, not at lower rpm.

Those codes could mean your MAF is toast/unplugged/has damaged wiring/installed backwards. What direction is the clip on the MAF pointed/do you have a known good one you can swap in?
the connector is pointed towards the front of the vehicle but I checked that already and it's impossible to mount it backwards lol I see that everywhere but idk how people are doing it.
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Old 07-27-2013, 02:31 PM   #15
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Clean the maf check the wires...I had the same codes after cleaning it and resetting ecu they were gone.

Side note if ur just gassing it from a dead stop and going %100 throttle and your saying its a little slow and Laggy till 3,000 ish rpm that's normal for a automatic sadly.
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Old 07-27-2013, 07:22 PM   #16
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Yeah some td04 start at around 3k. It depends on many factors. You have some good advice here. Check that stuff too.
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Old 07-27-2013, 07:31 PM   #17
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it aint the gas......nope
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Old 07-28-2013, 02:24 PM   #18
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P0113 is intake air temperature circuit high. This is not caused by bad gas. This sensor is integrated in with with the MAF sensor. I'd start there.
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Old 07-28-2013, 05:52 PM   #19
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id start with the connectors to the maf and the ground to the manifold......


it aint the gas
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