ilib11

Hi SAABaruu, Thank you for the detailed explanation! Do you have a kit for your changes in the cooling system you mentioned above? Or is there a detailed design specs that we can follow to build the same?

Parts replaced: 41022AJ030 - 2 pcs, engine mounts, really broken 41022AJ112 - front engine mount, broken 41310YC001 - diff mount, just in case 41022AJ070 - trans mount, just in case http://forum.liberty.asn.au/viewtopic.php?f=18&t=36648&start=90#p452529

Problem solved - that were engine mounts. http://forum.liberty.asn.au/viewtopic.php?f=18&t=36648&start=90#p452529 (link fixed) Thanks everyone for your help and Happy New Year!

I have found the parameters - they only visible in Romraider if you set Romraider to use SSM protocol, not OBDII. If it gets data correctly, I did not see any changes from the moment of a cold start till the engine is warmed up:

I looked to the actual intake and the actuators are there, so I do have TGVs. Not sure why they do not show in romraider. Regarding the service - the dealership performed a standard 'big' service - spark plugs, engine oil change, auto trans oil change, diff oil change. It was not a time belt change.

Thank you ivan.ej255! Looks like my Rom Rider does not show TGV - nothing similar in the parameters list. I use latest Romrider 0.7.2 (2020–11–11) with ECU definitions 0.8.3.1b Oct. 7th, 2009 and Logger definitions logger_v362. Could you please tell how do you see TGV in your rom rider or maybe share some screenshots? And if your problem is not related to the load then I think Fluidampr would help you - as you originally suggested. Regards, ilib11

To keep the discussion updated - I got a suggestion from another forum: "I wonder if the TVGs could be out of sync. When i was first starting out working on Subarus i made the mistake of taking the actuator off the TVG and had symptoms similar to what you describe. " https://sl-i.net/FORUM/showthread.php?20249-EJ255-Rough-Idle-amp-Engine-Shaking-under-load-like-Aircon-On&p=288665&viewfull=1#post288665 Has anyone know how to test these TGVs? Regards, ilib11

Hi FLlegacy, engine and trans mounts were checked - found that “RH diff cross member bush leaking” , replaced to the new one and that did not change the original issue at all...

I can get fresh figures as I already put new O2 sensor and MAF sensors. But I also upped idle to +300 rpm. Edit: here is the fresh log attached. Warm idle, Air Conditioning Compressor Signal (On/Off) indicates when AC is on. romraiderlog_1111111_20210808_162542.csv

Thank you, Scubaboo. The full set of logs is in this post http://forum.liberty.asn.au/viewtopic.php?f=18&t=36648#p449755 so everyone please feel free to have a look and make your suggestions. I can do more logs with romraider as required - just let me know what would you like to see. Here is the picture where the problem is well illustrated - the moment AC is ON, RPM drops and the engine runs like it is choked.

Hi ivan.ej255, thank you for your reply and it is a pity you spent so much effort and this issue is not resolved. Very similar story indeed. The potential difference that you got the car with it and I got this problem after the car went to a dealership service. That makes me think that there is some problem(s) with engine internals i.e. in the parts we have not touched yet My thoughts now are: a) uneven fuel supply from injectors b) blocked banjo bolts plus lower oil pressure on idle potentially causing AVCS system going nuts c) Valves/springs d) Catalytic converter causing too much back pressure which disrupts idle operations Unfortunately I do not have a place to dismantle / disassemble the engine to check these ideas out but I am trying to find a friendly workshop that can take the challenge without leaving me without car for months and/or making me completely broke Re Fluidampr - as far as I understand, it is for compensating torsional vibrations, I am not convinced it would help in my case. I have separate belts for power steering/alternator and AC so that is good. I appreciate if you can share your results once you install it - I have a timing belt service coming and will include Fluidampr too if it works. Scubaboo - thank you for the note! Yes, misfire count check on cyls 1-4 were checked, all are 0, idle or not. Thanks a lot, Ivan (ilib11)

I think I can exclude torque converter from this equation because I can replicate the problem with just extra load from AC, even if the auto transmission is set to N. If I put auto transmission to R it adds load to the engine the same way as AC does or adds extra load to AC and makes problem worse if AC is already on. So I do not think the root cause is in torque converter / transmission, but if there are any extra tests I can do I am happy to do them.

Hi Tony, First thank you for your suggestion, every bit helps! That issue is a long problem - have been trying to fix it over 6 month now. So multiple fuel stations have been used - the only difference is that the issue is a bit worse on 95 petrol than on 98 petrol. How long would you think the belt tensioner/ pulley would last if it started locking up? I have 5 years and 62K miles (100K km) since the timing belt was changed, a would assume belt tensioner/ pulley would have changed as sell at this time.

Hi All, Got some issues after a dealership did a service and need your collective knowledge to understand what is going on. Legacy (Liberty) GT, Auto, 2010, 100K miles . Went to the dealership for one of the typical service, got the car back with strange symptoms - engine is shaking on idle on added load like AC compressor turning on or a transmission set to reverse. With AC compressor, each time when it starts when engine is idling, there is a vibration wave for a couple of seconds. It is quite significant - can be physically sensed by hands on the steering wheel, via the driver chair, hood is visibly shaking etc. The engine looks like choked, rpm dropped for couple of seconds and then comes back to a normal idle work. No such issue on rpm higher than idle. With transmission put in reverse and the vehicle is kept stationary with brakes or with very slow moving backwards, it is the engine rough idle and a high vibration. If AC starts at this moment, the vibration becomes worse. Apart from this vibration, the car drives good, no problems with acceleration, no strange sounds, does not look like it has any misfiring. Real time data from ELM327 dongle & Torque and Rom rider logs look ok. I tried to return the car back to the dealership but they unable to actually fix the issue. They increased idle by approx. 100 rpm, so the vibration become a bit less but the issue is still there. They mentioned an adaptation/relearn period after a battery disconnect but after a while the issue is still there. Plus I do not recall any previous battery disconnects did anything like that. Unable to get them to fix the issue. I spend significant effort doing various tests and parts replacement while trying to find a root cause for the issue. The discussion is here in AU forum: http://forum.liberty.asn.au/viewtopic.php?f=18&t=36648 I can now say what it is NOT: - spark Plugs (new NGK) - ignition coils (new OEM) - MAF (new OEM) - first O2sensor (new OEM) - PSV valve (cleaned, checked) - throttle body unit (cleaned, swapped to another one used OEM) - air filter (new) - battery (new) - any rubber pipes etc I can touch without taking off the intake manifold - electricity noise or problems (oscilloscope shows stable supply with no noise mostly at 14.2-14.4 v) - oil cap - no intake leaks are found by a reputable service and myself. - petrol (use 98, the symptoms is worse on 95 though) Other checks I completed: - Fuel 51 psi with vacuum disconnected 41 psi with vacuum connected and AC off 42 psi with vacuum connected and AC on 39 psi-> 40 psi -> 41 psi when engine is off - Intake vacuum 20 mm Hg with A/C off 17 mm Hg with A/C on (measured at brake buster pipe) - Cylinder compression with open throttle (slightly warm engine): 1 cylinder - 9 bar (130 psi) 2 cylinder - 10 bar (145 psi) 3 cylinder - 9.5 bar (138 psi) 4 cylinder - 10 bar (145 psi) I am practically out of ideas what else could be a reason for this issue and how to fix it, at the moment the only workaround I have is to increase Iide RPM settings as + 200/300 rpm via Rom Rider, but that only reduces the symptoms to some extent, not a fix. I appreciate any of your help and advise on that problem. I truly hope someone knows a solution for that. Thank you and best regards, ilib11