ras11m Posted September 10, 2014 Share Posted September 10, 2014 Hi from Australia, Longtime lurker/first time poster here. I really hope someone can help me with this, The car has been to 6 different mechanics including Subaru Australia and no one seems to be able to resolve the issue. The issue started shortly after 75000 kms and the car now has 82000. It's a 2004 AUDM Subaru Liberty GT MY05 2.0L Turbo Manual. when the revs are kept at The issue is car shudders/stumbles at idle especially when warmed up and around 1500rpm the whole car shakes. Normal/on boost driving seems fine, the car pulls like a train. I am very frustrated with it and at a point I want to actually get rid of it. The mods on the car: 3" Dump Pipe Xforce Catback with Standard mufflers Tuned So far This is what has been done on the car: Front O2 sensor replaced (with an updated OEM one) Rear O2 sensor replaced (with OEM one) MAF Sensor replaced (with OEM one) MAP Sensor replaced (with OEM one) Injectors pulled out inspected/cleaned/flow tested and put back in the car Intank Fuel Filter replaced Spark Plugs replaced with Brand new ones Coil Pack inspected and checked. Air Filter replaced (with OEM one) AVCS Solenoids Pulled out inspected / cleaned and put back in the car all 4 of them Checked for Vacuum Leaks/Smoke Test done Compression test done (All with in specs) Regular Services done on time with Royal purple oil (5W-30) and only OEM parts used including upper Cylinder Cleaner Timing belt with new tensioner and pulleys done (Dayco Kit) Water pump replaced (After market) Always used Shell v-power 98 No Check engine light no diagnostic errors on ECU Learning view Screen shot can be found here: http://1drv.ms/1lRZ4vx Rom raider Logs can be found here: http://1drv.ms/1lRCTWg Please help me!!! Link to comment Share on other sites More sharing options...
chato Posted September 10, 2014 Share Posted September 10, 2014 what are you running for a tune? your learning view is showing pretty high fuel compensations. can't open the logs, asking for a login and password. Link to comment Share on other sites More sharing options...
gimpydingo Posted September 10, 2014 Share Posted September 10, 2014 As chato said the A/F is looking pretty high and can't access the other. Have you chatted with your tuner about these issue as well? Link to comment Share on other sites More sharing options...
RallyMachine Posted September 10, 2014 Share Posted September 10, 2014 From what I understand this is happening when you rev to 1500rpm in neutral correct? If so I have the same issue. Car runs pretty rough there and then is fine at anything over 2k rpm. I've been stumped for a while too. Link to comment Share on other sites More sharing options...
ras11m Posted September 10, 2014 Author Share Posted September 10, 2014 That is correct its happening when in neutral and idling as well as when revs are kept at around 1500rpm. What would cause A/F to behave high like that? It is a custom tune/reflash done in Sydney using open source tools. I reattached the logs here hope it helps , let me know if you guys need me to log anything else .Ras11m Logs .csv Link to comment Share on other sites More sharing options...
ras11m Posted September 10, 2014 Author Share Posted September 10, 2014 Tuner can't find any fault with the system . ECU is compensating for something , just need to find out what that something is !!! Link to comment Share on other sites More sharing options...
chato Posted September 11, 2014 Share Posted September 11, 2014 well, the computer is adding a bunch of fuel, so its seeing a very lean combustion. so either your under measuring air (vac leak or sensor problem), or you have some sort of fuel delivery problem. Check the turbo inlet for holes as a possible source of vac leak, you're at the age where they tend to fail. Other possibilities might be the fuel pump, or the o-rings in the fuel pump assembly. Link to comment Share on other sites More sharing options...
ras11m Posted September 12, 2014 Author Share Posted September 12, 2014 could it be the pcv valve? Link to comment Share on other sites More sharing options...
chato Posted September 12, 2014 Share Posted September 12, 2014 could it be the pcv valve? theoretically possible but uncommon unless its totally detached from the inlet tube. A torn inlet is much more likely. Usually tears under the worm gear clamp. Link to comment Share on other sites More sharing options...
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