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Old 02-16-2019, 08:14 PM   #1
19transam81
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Default Car runs like Crap

hi team,

i have a saabaru 2005, stage 2 with a MBC and a catback exhaust. everything else is stock. No intake, BOV, nothing other than the exhaust and a tune from pullz on e tuning. the car was misfiring pretty bad so i changed the plugs and the coil packs and then the MAF. nothing has changed, car is still misfiring. did some data logging. one at idel, one cruising and one i tried to do a bit of a pull in forth but she started poping and missing above 10PSI. the car seems to feel fine once i am on the highway but the minute i slow down or stop, shes pissed, if i go above 10PSI, shes pissed.
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Old 02-16-2019, 08:15 PM   #2
19transam81
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i am not sure how to post the CSV file of the log from romraider, if someone can help me do that, that would be awesome
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Old 02-16-2019, 08:24 PM   #3
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Old 02-17-2019, 01:26 AM   #4
Boosted_Shoe
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May I ask if you gapped the plugs? I had huge stuttering issues at about 10 psi in my forry, hadn't gapped the plugs to .7mm
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Old 02-17-2019, 10:40 AM   #5
19transam81
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Yes the plugs came Pre gapped because they are Iridium. They checked in at .30
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Old 02-17-2019, 03:10 PM   #6
TXwrxWagon
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WRB not so minty fresh

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no CEL or Codes?

I just did a bunch of maintanence and intake related upgrades and mine, while not being tuned started acting "pissed" as you called it..

Turned out I had a vacuum cap that had split on the front of the intake, in plain sight.

Remember your Saabaru is 13-14 years old now, Even stock they go through some horrendous heat/cool/heat cycles which are hell on the cheap/basic vacuum lines and other soft hoses under the hood.

also when you did the MBC did you take out the restrictor pill in the wastegate line and take all the old lines out and cap off the ports? same, cap off and disconnect the EBCS (preferably removed it) ?

I'm just tossing out things I remember reading were causing issues with a set up like yours from back when I first started on NASIOC.

~Rob
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Old 02-17-2019, 03:19 PM   #7
TXwrxWagon
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also: new or used coils? new sourced from where? and lastly: I know it sounds simple, but coil pack wires are plugged onto the correct coil packs, right?

I ask all these because I've done them... guilty.

~Rob
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Old 02-17-2019, 05:21 PM   #8
D-Rodman
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Default Car runs like Crap

Use zipties on the coil pack plugs, make sure you have good contact. You may want to replace the fuel filter inside the gas tank.
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Old 02-20-2019, 11:10 AM   #9
19transam81
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new coils, OEM. black plugs in the back, white in the fronts, should be all good there. bought the car with the upgrades done, it was fine for the last year and a half so i think the pill was out? tune: it has a stage 2 on it, catless down pipe and boost controller, its tuned open source
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Old 02-20-2019, 12:26 PM   #10
86Dreams
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Do you have a wideband you can log? This looks like it has fueling/ air modeling issues. Your AF learning and corrections are high.

Other things not mentioned that can cause misfires:
A broken engine/cracked ringland
Bad injectors
Bad FPR
severe Vacuum/intake leaks
Stuck TGVs
Incorrect tuning

Are you able to smoke test the intake? One thing that can cause issues is the turbo inlet pipe. right at the hose clamp on the turbo the inlet can rip underneatch where you cannot see it. This will cause a lot of extra air to get pulled in causing lean conditions.
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Old 02-20-2019, 02:34 PM   #11
19transam81
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vacuum and boost leaks were just tested. just did a smoke test this morning. what do you think about an o2 sensor ?

leaning towards.
A broken engine/cracked ringland
Bad injectors
Bad FPR
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Old 02-20-2019, 05:10 PM   #12
D-Rodman
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Or skipped timing.
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Old 02-20-2019, 07:01 PM   #13
snobordboi
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Could also be a failing fuel pump.
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Old 03-13-2019, 01:24 PM   #14
19transam81
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the fuel pressure was tested, came back in spec. i changed the front O2 Senor and the MAF CEL went away. no the only code left is the rear O2? which is weird because the tune should take that out of the equation.
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Old 03-13-2019, 01:29 PM   #15
19transam81
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new data log sheet added after new O2

https://docs.google.com/spreadsheets...6F1uRc/pubhtml
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Old 03-13-2019, 01:44 PM   #16
19transam81
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this is the new o2 sensor and new MAF

https://photos.google.com/photo/AF1Q...lmdYg3VfJw4Gl1
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Old 03-13-2019, 01:44 PM   #17
19transam81
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Old 03-14-2019, 08:47 PM   #18
dterron1477
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I have a similar issue and when I unplug the MAF, it runs fine
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