2,000-3,500k bogging power brapp noise.
 

Hey Guys,

Having an issue with my 86 and was hoping someone could chime in on what the issue could be. I first had the issue yesterday where I was in 3rd gear around 2.5k rpm and accelerated part throttle and the car felt like its bogging power wise also sounds weird. Best way to describe is brapp brapp brapp up to 3-3.5k rpm.

The only way I can replicate the issue is either from 1st or 2nd gear setting off as slow as possible and then WOT. Starts around 2.2k rpm and goes through to 3.5k rpm and feels like its bogging not just the usual torque dip.

I took a couple of videos which you find below but its hard to hear it on video. Mod’s wise just a track pipe and other than that stock.

Would really appreciate any feedback, I searched my A** off and could find anyone else with the same sound/issue.

[ame="http://www.youtube.com/watch?v=zGUREmX6iwo"]Bhrapp noise between 2.5 to 3krpm - YouTube[/ame]


Best I could get so far, will get the office professional mic.

[ame="http://www.youtube.com/watch?v=yk39XHs3GAk"]Engine noise - YouTube[/ame]


Best capture at 2:18

Cheers,

Sam

Idk can't really hear what your talking about. How many miles you have on it?

Just had a drive in the car and my best guess would be injector failure.

Video shows 43,*** KM 0.o?

Well, I can't hear or see anything that indicates bogging .....:iono:

Have you changed type (brand) of gas lately ... ??


humfrz

Filled up the morning it happened. Super 95 fuel.

Very possible its bad gas, espeically in a car with 12.5:1 compression. See what happens with your next fill up, and use a different station. As a side note I don't hear anything strange, but its hard to tell in a video

Yep, I agree ..... could be some funky gas. At least try a different pump, if your choise of stations is limited.


humfrz

Try a can of quality dry gas (ethyl alcohol). It might not solve the bogging issue, but it is a very cheap way to find out if it may be bad gas.

[ame="http://www.youtube.com/watch?v=VEcIswXR_Xo"]Engine issue - YouTube[/ame]


Updated video much more noticeable.

I have also filled up this morning different station will super 95 so it wasn't a case of bad gas.

Cheers!

1.18sec you notice the change in noise around 2.5k

I don't hear anything.

I have a similar thing happening. I don't think it's a fuel quality issue in my case.
I see that something is also happening for you right around 4500-5000 rpm like VTEC kicked in yo...

For me, it developed last spring and I had my plugs changed. It made a difference but it didn't go away entirely. I will add that I had some issues with a previous tune, then switched to another tuner and changed over to E85. It was almost imperceptible but then noticed it had become more pronounced when I switched back to pumpgas for the winter, and ultimately storage.
My car is garaged for the winter, but I do plan on revisiting this once spring hits.
Subscribed...

[ame="http://www.youtube.com/watch?v=14nJT9a6K4k"]2.5 - 3.5k weird sound - YouTube[/ame]

I request you put headphones on and listen, please tell me someone can actually hear it this time..

Not on the first rev, the second one after the air dump from the truck that passed me.

Cheers!

How long have you had the track pipe on your car? The AVCS on these cars kicks in somewhere between 3500 to 4000 rpms also.

It's been on for a couple of months now. If what you are trying to get at is a recent change causing the issue its highly unlikely.

Thanks for input tough, could you hear what I'm talking about?

I think I heard something like what you are describing but it sounded pretty even, I'll have to listen to mine closely next time I drive it. It doesn't seem like it's having a problem as it comes up through the rpms in that range. One thing with the exhaust I was thinking of is it moving just right in that rpm range as I had that problem with my impreza at one point.

it's difficult to hear it but i know what you're mentioning. i also agree on trying different gas?

Sounds like a UEL exhaust system. But I do hear something, sounds like a cylinder is missing slightly. Could be bad spark plug, coil, injector, or cylinder leakage (blown DI seal, poor compression due to leaking rings or valves) all spring to mind. That's just seat of the pants guestimation. You can rule out most of that by doing a compression test, and checking the plugs and coils.....good luck. Also one more thing it also sounds like the cam belt skipped a tooth - I know it's chain driven but that could mean that the AVCS could be acting up and possibly phasing the cams improperly at low RPMs and when you get to high RPMs they engine responds better?

i had same issues . visit AFM for test ur DI injectors for failure or burned DI seal . only use 98 RON or higher

That is a misfire. You can hear it and see it on the tach.

That's my call on that, too. Cylinder dropping out. Got that noise out of my old altima. Trick is, what's causing the misfire? In the altima, it was weak/no spark, I pulled the plug boots to do a little clean up and ultimately ended up severing the wire inside the boot. Very expensive way to find a $10 problem. Didn't throw a cel, though it should have.

I also had similar issues in other old GM V6's with coil packs going bad. Got worse when under load. Need 4 things for combustion fuel, air, compression and spark. The tech needs to find out which one (or more) of those components is missing.

If you have the EcuTek ProECU you can check via the logging to see if it is misfiring or not. (see attached screen)

Otherwise the next step would be to hook it up to a scanner and see if it is misfiring or running rich. Misfiring is usually caused by an overly rich condition, or a bad ignition component. If knock caused the misfire you'd hear a sound similar to pool balls hitting eachother just prior to the misfire.

Hey Guys,

Gave the car to dealership and got told issue is fixed. My question was what did you do? Apparently a ecu update and pulling and cleaning the injectors sorted it.

Well bull, it's not as bad sound wise, but same if not worse performance wise. I feel like I'm driving a stock last gen civic type R. No power torque anything under 5k and then whoopy a Fkn normal car.

Argh! I don't know what to do. No CEL no buneos!

do u have poping after fix the issues by AFM ?

the power is came after 5k u have rev it high to get it .that best for fuel economy .

Have you owned a Subaru before? This is how the factory tune sounds. Unfortunately with Subaru the best thing you can do is have a little tuning done by someone experienced with subarus. They have a rep for not honoring warranty anyay.

last video at 22 seconds you can hear a pop, not sure it is from outside or you bumping the phone but sounded like the DI seal failure pop when you give the car throttle. I could not tell the difference for awhile and in that range of RPM anyways the car has very little torque. That is where the torque dip lies.

What was the verdict?

Hi All,

Sorry it's been a while. I have owner a Forester from brand new to over 110,000km trust me I know full well about torque dip and boxer motors.

Anyways finally got AFM technical team involved and after several days the have confirmed direct injection issue. I've told them to also check spark plugs considering the related issues.

I'll post back once I get the car and see if I can ask for original parts with some photos for you guys. Interesting to know I don't have a CEL and the issue doesn't seem to be like anyone else with DI issue.

Cheers,

Sam

Thanks for the update, it was hard to hear the pop but its there. You have just been initiated into the 2012 build date DI failure club. There is no fix thru warranty as the 2013 builds have a calib flash that so far has taken car of the issue. Edit: 2 years later the finally issued a TSB unrelated but it updates some of the issues that blow DI seals, tell you dealer your idle dips.


Who is the AFM Technical Team?

Thanks,

Toyota dealer within United Arab Emirates is Al Futtaim Motors (AFM) they have an in-between company/team/entity that are called Toyota Technical Team. We have already had issues that we show TSB and AFM will not validate warranty because Toyota technical team has not issued the related NSB (National Service Bulletin 0.o?) Still have that stupid shifter rattle.

Anyways, injectors have been replaced and apparently issue is now resolved. So I will be going on Saturday to test drive the car and check everything is ok.

My only concern now after speaking to technician apparently was a small leak if spark plugs are damaged (Bank 1 my guess) or if they are fine. Dunno how much I can push them to check spark plugs as well.

Cheers!

Sam