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Old 12-12-2012, 07:20 AM   #1
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horrible mpg in the wagon.

22.5 right now. at $3.60/gallon, it's adding up fast.


The new tune was supposed to account for the 3.5bar, but I'm not sure it's doing so. I'd like to rule out inexpensive sensors before paying for a re-tune.

MAF seems to be reading correctly, and most all the sensors seem to be reading correctly, but the SID is telling me the ECU is pulling close to 23% fuel out.
I swear it didn't run like this before I swapped the engine.

SID MPG is verified via fillup vs odometer.

Smarter guys than me. What affects mpg? I have a new temp sensor I'm going to put in the car. The front o2 is "new". it's an OE with <5k miles on it.
It's been a while since I've done a intake leak test, but last time, it was perfect.

Intake air temp sensor seems to always be right around ambient, maybe 2-3* out. any other tips? anything else I should look at in the SID for clues?
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Old 12-12-2012, 09:05 AM   #2
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Its getting colder out. Check your tire pressure.
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Old 12-12-2012, 09:07 AM   #3
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my 9-5 gets the same mileage.
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Old 12-12-2012, 01:48 PM   #4
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Tire pressure doesn't cause the ecu to pull 23%
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Old 12-12-2012, 01:50 PM   #5
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Dirty air filter? I put a new one on my 9-5 Aero and improved my gas mileage almost 2 mpg.
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Old 12-12-2012, 04:52 PM   #6
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Oh Craig, I know the banking system sucks Ass, Ex banker wiffee manages about the same 22mpg in traffic all day, I just clocked the Aero @25.0mpg "16 gallon refill interval" yesterday,AC off rolling on country roads. Did you put that "Echo in China" Fuel preassure reg back in? I put a stock 3.0 back in with 02 brown injectors with the piston replacement because the 3.5 wouldn't hold preassure at shut off. Have you cleaned the mass meter? Or are you running the cheap Piss from Royal farms?. How is it running anyway? Did the power curve change @ all?
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Old 12-12-2012, 05:35 PM   #7
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I did put the 3.5 back in. I may take your advice and order the euro 3.5bar.
I've cleaned the MAF, too. I also put my newer OE saab front O2 sensor in. I was thinking; The car's had a long start-up since it's come out of my garage. It may be more likely that the fuel check valve int he tank isn't working well. I've read pf a few people having the same issue. It's actually gotten better; the SID says 1-second for start-up, instead of the old 2+

The car's running well for power. Feels great, but I hardly get on it anymore.
I can't afford to break it again, so I'm really babying it. It does feel nice when I do need to get on it for passing/merging, though.

I guess the biggest issue I have, regardless if it's a 22mpg car or not, is that the ECU is pulling almost 23% globally. Maybe I could squeeze another few mpg out of it, if not the 10 or so I think it's missing.
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Old 12-12-2012, 05:45 PM   #8
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Also, Harvey... I sent you a PM recently. any chances?
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Old 12-13-2012, 04:16 AM   #9
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You know the kind of Chicken little scratch i charge people to fix major stuff, Thats why i just doubled the shop space & hired a writer/manager, So I can worry about producing & he can answer the phone, But this is still in its infancy. I flat out couldn't afford to pay you to make the drive right now. Maybe someday but as for now, We're all scratching around the dirt. As for your car. Put the 3.0 bosch FPR back in. If you want a REAL 3.5 order it for a Escort cossi. Those Chinesium 3.5 or 4.0's work but not so well in T7 cars because of they fail to hold fuel pressure at shut off. It was Defective so i put a stock 3.0 in remember?
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Old 12-18-2012, 07:11 PM   #10
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so... good news/bad news.

good news, I swapped in the spare water temp sensor, and took some time to clean my connectors for pressure sensor, intake temp sensors, and water temp sensor, and used a little dielectric grease. car runs better, water temps seem more-realistic. same with intake temps.

more good news. Amul is now -2.69% That's pretty good, I think. I wouldn't expect any different from a 100% stock car.

bad news... Still 23mpg.

Am I doomed to lose mpgs with my tuned car? Is it the t5 cams killing fuel economy?
anyone have a tuned 9-5 that still gets the untuned 28-32mpg? I'd be willing to pay the couple-hundo to have it in-check. at $4/gallon, a re-tune would pay for itself in about a month!
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Old 12-19-2012, 06:51 AM   #11
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I only get 25mpg if I drive like a "normal" person on no highways. I can work at it and get 28mpg, then about 32 on the highway.

Try driving like the throttle will kill you.
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Old 12-19-2012, 05:33 PM   #12
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Reference point: 25.5 mpg at the pump

45 mph avg, 23 mile, dirt road commute with new studded snows (205/55 16).

2002 9-5 wagon, 5 speed, t5 cams, otherwise stock.
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Old 12-19-2012, 07:51 PM   #13
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Dude, this is normal and still decent. My 03 Aero Nordic stage 2 averages 18-21 combine city and hwy. If i reset it on the hwy it averages 27-30. Remember you are on winter blend gas too.

Also if your worried about money, put 87 in it and put a stock ECU in. You have to pay to play
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Old 12-20-2012, 09:06 AM   #14
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i used to average 30mpg in my 99 wagon with t5 cams, and a tune,, but at the time my average was basically all highway.

it could be running to rich when in open loop,, open loop fueling does not affect fuel adaptation. You are in open loop whenever the lambda readout on the SID drops to 0.

the more i dig into e85 tunes,, the more i dislike how they do these things,,,,

HIDSPG is right,, you have to pay to play. Stock cars stay reliable for a reason

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Old 12-20-2012, 01:52 PM   #15
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I'm no stranger to tuning, perfomance, and paying to play, so to speak.

There's no reason a tuned car should get worse mpg in closed loop, though. It should trim fuels accordingly, and hum along as if it were a stock car. Even better-so, since it's got a free flowing exhaust, intake, and cams. I agree that the e85 tune may have something to do with this, but aside from Steve (who did the original tune), nobody seems really confident in tuning the e85 side. Since you adjusted the tune for the 3.5bar, my e85 adaptation doesn't seem to work. It's read 0% since then, on every fill-up, from many different stations. If anything, it should be higher, with winter fuels. I'm certainly not blaming you. You helped me out, and I appreciate it. Until I went through the sensors and SID info, I was assuming it was a hardware issue. now, the Amul sits at -119, and it's slooowwwwwwlllyyyy creeping to 25mpg, with dips if I decide to have some fun.
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Old 12-21-2012, 03:31 AM   #16
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I used to get 24-25 mpg in daily commute with rush hour traffic with my stage 2 tuned 03 9-5 aero wagon 5-sp manul. After going to stage 3 plus 3.5 FPR, bigger injectors, ETC IC and E85 capability, my mileage dropped down to 22-23 mpg. Used to average 29-31 mpg on all-highway driving, now more like 27-28 mpg.
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Old 12-29-2012, 06:02 AM   #17
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Quote:
Originally Posted by Saabeh View Post
I only get 25mpg if I drive like a "normal" person on no highways. I can work at it and get 28mpg, then about 32 on the highway.

Try driving like the throttle will kill you.
This, what also worked pretty good for my car was putting fresh plugs and replacing all my vaccume lines, I was struggling to get 23, now I get about 25-26. My cars is a slush box aero stage 1+

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Old 12-29-2012, 07:06 AM   #18
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23mpg on E85?


I see no problem here.
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Old 12-29-2012, 08:14 AM   #19
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My '07 9-5, which is stock and an auto for the record....

According to the computer gets 22-24mpg mixed normal driving. Drops to 19-20 when towing, and goes up to 30-36 when reset on the freeway. Realistically I don't think your gas mileage is that bad.

I will say though that my wife's '10 9-3 just had a HUGE drop in MPG since it started getting cold out (and interestingly enough since we installed a CAI and the roof rack). Went from mid 30s (35-36mpg) to high 20s (27-28 )... I'm chalking that up to winter blend, the roof rack (it's not very aerodynamic), plus the fact that we let it warm up before driving it. That'll put a hurting on the MPG.
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Old 01-05-2013, 10:10 AM   #20
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I bet you 10000% that the t5 cams are taking that additional ~3mpg that's keeping you up late at it, or so it seems...

(mine dropped 3-4mpg after cam install, slightly 'tuned' for them.

I'm where you are; 22-23 avg daily drive; Though I do beat it a bit...
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