Jump to content
SAU Community

Recommended Posts

So still in the process of elimination to restore the super smooth idle and engine rev I had pre AMPerformance intake and new 7 range plugs.

Idle is more like a rumble and and rev is a tad rough compared to before, but it bothers me a lot and sucks on long drives.

Also noticed an decline in fuel consumption.

I've changed coils packs for nothing so it's not those.

Could be a bad plug, or maybe just the difference between the factory 6 and iridium 7.

The last thing could be the absence of the resonator on the intake.

I remember Dale retained his and just fabricated a better flowing bottom half.

I'm thinking of mating a factory top half to the AMPerformance intake to see if it fixes this.

Any thoughts ?

cheers

 

Link to comment
https://www.sau.com.au/forums/topic/465740-m35-rough-idle/
Share on other sites

This is what mine is doing and I have the standard type plugs in and still the standard intake. I have checked several times for a vac leak and changed the hoses and all the sensors to no avail. I have now ordered a couple of new coil plug stems to change over as it seems to be a miss on the drivers side bank. It runs fine when I drop it down a gear and have the revs above 3000rpm but misses and hesitates between 2000 and 3000.

Sent from my SM-G900I using SAU Community mobile app


Link to comment
https://www.sau.com.au/forums/topic/465740-m35-rough-idle/#findComment-7756329
Share on other sites

hmm don't think so, no codes for that.

I'llgive the AFM a clean and clean the plug a bit.

The engine just doesn't sound or feel right.

Like the harmonics are out

 

I'll try fitting a resonator to the AMP intake by welding a pipe onto it to connect it

Link to comment
https://www.sau.com.au/forums/topic/465740-m35-rough-idle/#findComment-7757118
Share on other sites

3 hours ago, conan7772 said:

hmm don't think so, no codes for that.

I'llgive the AFM a clean and clean the plug a bit.

The engine just doesn't sound or feel right.

Like the harmonics are out

 

I'll try fitting a resonator to the AMP intake by welding a pipe onto it to connect it

from my experience, i'd say some AFM issue may not trigger the dash CEL.

when you totally blow the AFM, then there is CEL, but for intermittent AFM problem, there may not have CEL

Edited by YangLIU
Link to comment
https://www.sau.com.au/forums/topic/465740-m35-rough-idle/#findComment-7757182
Share on other sites

Given the sealing arrangement used by the AM Performance intake between the two sections; bet my life that the miss is unmetered air getting in through the slip joint.

It's a silly idea, and unless it was an o-rings joint; it will always leak a little, if not a lot.

Link to comment
https://www.sau.com.au/forums/topic/465740-m35-rough-idle/#findComment-7757804
Share on other sites

Given the sealing arrangement used by the AM Performance intake between the two sections; bet my life that the miss is unmetered air getting in through the slip joint.

It's a silly idea, and unless it was an o-rings joint; it will always leak a little, if not a lot.


Never had any issues when i had it on mine....

Air flow is feeling very restricted as of late
  • Like 1
Link to comment
https://www.sau.com.au/forums/topic/465740-m35-rough-idle/#findComment-7757895
Share on other sites

Quote

the smoke test did show leaks in the join, Jez siliconed the two halves together, so should be 99% better.

I'll try the resonator install, easy weld on a piece of pipe , just need a resonator now.

I swear this car went harder before I started modding it, down low anyway.

Might even be a blown head gasket, got oil pissing down on to the turbo now too.

 

 

Edited by conan7772
more info
Link to comment
https://www.sau.com.au/forums/topic/465740-m35-rough-idle/#findComment-7758025
Share on other sites

?/ Don't know mate, I didn't tune it.

Anyway it's not tune related, nor can any tuning fix it.

After fitting new plugs and the intake, which was a mistake, should have only done one then tested, car vibrates on idle and up to around 2500 rpm.

I noticed it instantly and exhaust is louder.

Thought maybe a bad coil.

I've seen a few vids on resonator removal on other cars with massive negative effects.

Strange exhaust tones and loss of power.

Can't find any evidence of improvement.

One article which was quite in depth mentioned intake resonators as crucial to that specific engine design.

Anyway, the engine was way smoother before, so I'm trying hard to restore that.

Apart from that it goes pretty hard, high rpm in low gear manual mode is insane.

If it aint the resonator then I'll try new plugs again, maybe go back to stock 6 spec standard.

If that doesn't fix it I might try drinking way more alcohol.

 

Link to comment
https://www.sau.com.au/forums/topic/465740-m35-rough-idle/#findComment-7758377
Share on other sites

Are you 100% sure that the gasket is in place, and the intake is sealed against the comp cover? The gasket is tricky to get in the right spot; and can swing down on the stud. 

What about the sealing face of the intake itself; definitely flat?

It has the hallmarks of an unmetered air leak.

  • Like 1
Link to comment
https://www.sau.com.au/forums/topic/465740-m35-rough-idle/#findComment-7758673
Share on other sites

  • 7 months later...
  • 1 year later...

my car just did the same thing when i was driving it stalled on me and lost power, the after 6 tries of cranking, she started up again, i gave her a couple revs to make sure she was running smooth, then when i started driving halfway to my girl's house the car was lugging again at 60km/h. Any idea if this is similar to your guy's cars problems? Any idea what the problem is?

Edited by Spear17
Link to comment
https://www.sau.com.au/forums/topic/465740-m35-rough-idle/#findComment-7875754
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • If that's the wiring from the factory, I'd be inspecting the loom everywhere.   Any signs of that anywhere else, and seriously, I'd get rid of the car ASAP before the electrical gremlins make it worthless, or it goes up in flames on its own. That is scary how that insulation is failing!
    • I should note too as I have all 4 wheel speed inputs to the emtron I now have the emtron controlling the attessa solenoid for 4wd/traction and launch control strategies. 
    • It works quite well with the adjustibility within each of the programs of the turbolamik. Essentially p1 is drive and lockup comes on like a normal driver.  But in program 7 I have customised it to not request the lockup clutch to engage until something like 6500/7 when slip was the lowest. 
    • Yep, I like that. The tags are only on the first post of a thread and we don't get huge numbers of new threads. Also, I plan to add some more report types and we could have a member report type like 'review tags' then members could flag if they thought a topic wasn't tagged correctly.  No way man, I dig the input. Thanks! 
    • It's a valid thought. There's not exactly that functionality already (when creating a thread) - that's where the OP can use/create any tag they want. We'd have to come up with a way for the user to request their tags get reviewed or something. Otherwise the mods would have to review every new post's tags (for those that have them, anyway). There's kind of that functionality already exists to some extent, post facto of starting the thread, where the OP or any other user could report the post to admins, and request that tags get reviewed. We could do this already, and any user could already have made such a request. To make it a part of the forum proper, it would require an initial and an ongoing education programme, so that people know that it's a thing. OP based tagging/request for review would also require at least some (probably most) of the user base to be told that it's a thing they can do. Both of these things probably wouldn't spread too far and/or get used very much. If it was the standard approach on a lot of different sites, then it might do, because people would be used to it. Prank's approach to this differs from my original thought, by leaning into tagging. Which is fine - it's possibly better than what I originally suggested. In fact, I just went to the R32 GTR wiring diagram thread and added tags, including "Library". That's probably a good way to use tags and the idea of a library. We just have to drag together an (organised!) index of threads or posts that have that tag. I have yet to do any of my own follow up by pursuing worthy threads and posts and reporting/marking/tagging them for the library, such as the @Sydneykid stuff I was talking about, and possibly any amount of @Lithium 's and others' posts. At least if I tag them Library, we'll have a start.   Back to @Wazmond's idea as it relates to @PranK's, we might have some sort of a list of tags that are already used to scrape for this library. I'm not entirely sure how that would be presented or used, particularly if it got long. But it's yet another idea!   cheers
×
×
  • Create New...