Rough Idle & Engine Shaking under load like AC

Posts specific to the 2.5 litre turbo engine

Re: Rough Idle & Engine Shaking under load like AC

Postby bigBADbenny » Wed Sep 01, 2021 11:57 pm

That latter point applies to your idle graph question.

The less parameters the more resolution.

So if you want to “see” your vibration issue in the log, you’d want to start with as few parameters as possible and work your way up till you lose resolution from adding too many parameters.

I want to say my understanding of Romraider specifics is limited at best so if anyone can set my interpretation of the logs straight, please chime in ;)
User avatar
bigBADbenny
 
Posts: 9979
Joined: Tue Oct 04, 2011 6:36 pm
Location: Collingwood, Melbourne
Car: MY07 GT-B 6MT OBP Wagon
Real name: Ben Richards
Profile URL: http://tinyurl.com/agvbzop

Re: Rough Idle & Engine Shaking under load like AC

Postby bigBADbenny » Thu Sep 02, 2021 7:01 pm

Indeed I have a GenV vin saved somewhere just for occasions like this.

The differences from gen4 astound me.

Eg the sump, the turbo sump, the camshaft driven turbo oil drain scavenge pump.
And now looking at the intake, charge pipe & pcv system.

There’s a lot going on lol.
User avatar
bigBADbenny
 
Posts: 9979
Joined: Tue Oct 04, 2011 6:36 pm
Location: Collingwood, Melbourne
Car: MY07 GT-B 6MT OBP Wagon
Real name: Ben Richards
Profile URL: http://tinyurl.com/agvbzop

Re: Rough Idle & Engine Shaking under load like AC

Postby bigBADbenny » Sat Sep 04, 2021 9:06 am

So just looking at the figures again, due diligence of course, outliers, open mind etc...

I notice your idle TPS is 3.5% across at least 2 logs.

So I looked that up in the FSM: "Throttle opening angle signal Throttle Opening Angle % 2.0 — 2.4%" at idle.

Screen Shot 2021-09-04 at 09.08.45.jpg
Screen Shot 2021-09-04 at 09.08.45.jpg (55.31 KiB) Viewed 142 times


Meaning 3.5% is out of spec, and sometimes this is due to a dirty throttle body or plate.

If you're removing the TMIC to clean the TB, get an assistant to actuate the plate using the pedal.
Manually moving the DBW throttle plate can damage the gears.

If removing the TMIC isn't feasible you could potentially spray the TB from the BOV mount, with the latter part temporarily removed.
User avatar
bigBADbenny
 
Posts: 9979
Joined: Tue Oct 04, 2011 6:36 pm
Location: Collingwood, Melbourne
Car: MY07 GT-B 6MT OBP Wagon
Real name: Ben Richards
Profile URL: http://tinyurl.com/agvbzop

Re: Rough Idle & Engine Shaking under load like AC

Postby ilib11 » Sun Sep 05, 2021 9:52 am

Hi bigBADbenny ,
good pickup with TPS, thank you!
The throttle body is ( and was clean) - that was the first point I started from when I got this issue. All cleaned up, throttle body position re-learned, then I even replaced the throttle body to another one (used).
I looked into the logs - there are one where I set RPM as +300 (log2) and another one when I set no such RPM adding, i.e. default setting (log3)
With No Added RPM and no load TPS is 2.35%, With RPM +300 and no load TPS is 3.92%.
So I assume we should count TPS with no load and default settings - which is 2.35% and it is within specs:

No added RPM :
Log3 Throttle.JPG
Log3 Throttle.JPG (229.12 KiB) Viewed 133 times



Added RPM:
Log2 - RPM up Throttle.JPG
Log2 - RPM up Throttle.JPG (240.17 KiB) Viewed 133 times
Last edited by ilib11 on Sun Sep 05, 2021 11:59 am, edited 2 times in total.
ilib11
 
Posts: 58
Joined: Sat Dec 07, 2013 12:09 pm

Re: Rough Idle & Engine Shaking under load like AC

Postby bigBADbenny » Sun Sep 05, 2021 10:25 am

Its strange, I looked at some of my logs and same thing.
From a friend that had a really gooey TB and some idle issues, it was running around 5% at idle.
8EE70FF2-23DB-4E40-98C9-2356C051AD0F.jpeg
8EE70FF2-23DB-4E40-98C9-2356C051AD0F.jpeg (106.3 KiB) Viewed 133 times
User avatar
bigBADbenny
 
Posts: 9979
Joined: Tue Oct 04, 2011 6:36 pm
Location: Collingwood, Melbourne
Car: MY07 GT-B 6MT OBP Wagon
Real name: Ben Richards
Profile URL: http://tinyurl.com/agvbzop

Previous

Return to 2.5T engine specific

Who is online

Users browsing this forum: No registered users and 1 guest