Shuddering (boost Issues?)

[QWK32]

Scott, he means O2 sensor, the one on the exhaust, not air flow meter. Tomas, my O2 sensor packed up on me at about 68000km but i didn't have any issues with shuddering or jerking. i was just using a bit more fuel than before and the engine check light flashed up a few times.

[scotty nm35]

I know, That's why I said to clean the airflow first as it sounds like its running lean.

If the O2 was stuffed it would probably throw an error and run rich.

[atomaly]

I know, That's why I said to clean the airflow first as it sounds like its running lean.

If the O2 was stuffed it would probably throw an error and run rich.

looks like it was the O2 sensor.. unplugged it, and its sooooooooooo smooth! no juddering whatsoever in any case of cruise or boost.

i'll take it for a longer drive tomorrow night and see how that goes!

it actually feels like its running BETTER and not as rich as before after unplugging it! (less plops and very smooth)

thanks scott! i still wanna pop in and say hi anyway! and check out ur m35

i'll post again when im 100% sure its all fixed!

(i have a feeling it was unplugged WHEN i bought it, and my mech has plugged it

in when going over the car hence the correlation between servicing and the issue starting)

[atomaly]

Andddddd the issue is back after a longer drive tonight

wierd cos It was driving pefectly for the first 25 mins then

after that it just hates me

[central coast person]

did you change the spart plugs?

You mentioned the car does it over 2500 RPM, does the turbo start to spool up around then? If so it will be putting the engine under more load and the plugs that are in there may be struggling to ignite under load. A O2 sensor is only a electronic measurement that is fed to the ECU so the car runs more smooth (checks ratio of things like fuel and air). This is why it might be a spark issue.

If it was the turbo dying you would hear some horrible noise.

If it was air you would feel somthing similar too a stall. If it was a air flow problem it is 99% of the time a problem through all RPM ranges aswell.

E.G. if its a spark problem you will notice it misfires underload. The way you have described it is like misfire and maybe the plug so not operate well when hot because they are on there way out.

If you changed the plugs you will ave to get your coils looked at so you can iliminate igntion possibilites.

[wolverine]

Almost certainly it will be the coil packs on a series 2.

Clique recently fixed issues with his car for about $25 using the spray on sealant on his coil packs. There is a DIY floating around on the forum. It looks neater than covering them with high temp silicone.

[atomaly]

thanks guys,

i'll be changing the sparkies when i can find them

tried to get the NGK BCPR6ES gapped to 0.8mm! and i could only find the NGK BCPR6ES-11 gapped to 1.1mm!

wheres the best place to get the right ones?? order online?

[BensDR30]

Get a new O2 sensor while you're at it. They don't last forever and are an important part of the EFI equation.

[wolverine]

The 1.1mm gap is fine unless your coil packs are faulty. You can gap them down to 0.8mm with feeler gauges if you really want to.

The O2 sensor is only worth replacing if it is faulty.

Here is a link to the correct product for fixing coil packs.

http://www.skylinesaustralia.com/forums/in...t&p=3587533

[pipster11]

my o2 sensor died in my outback (would rattle if you took it out and gave it a shake) and it ran like a piece of poo

it would buck and surge on flat ground but not all the time

also felt really flat to drive unless you were going flat out (o2 is ignored at WOT and above a certain amount of revs)

ended up selling the car cos i though it was about to die on me

wish i had known is was such a simple fix

kudos motorsport sell them online for about $200 for a stag, its the same one as an r34 so it may pay to go to bursons, just tell them that the usual price is about $120 and you should get them for that

btw, s2 ftw

[atomaly]

The 1.1mm gap is fine unless your coil packs are faulty. You can gap them down to 0.8mm with feeler gauges if you really want to.

The O2 sensor is only worth replacing if it is faulty.

Here is a link to the correct product for fixing coil packs.

http://www.skylinesaustralia.com/forums/in...t&p=3587533

ahhhh so my mechanic told me to gapp to 0.8mm! so i'm gonna follow his lead. thats what they are at currently and the current plugs are platinum.

where in VIC can i buy the gapped to 0.8 NGK BCPR6ES? cos i could only find the BCPR6ES-11

i dont think i know enough about what i'm doing to do that to my coil packs!

i'll change the sparkers first, and if that doesnt fix my problem, then maybe someone can give me a hand doing that fix to the coilpacks! ? (i'll supply beverages )

Edited November 29, 2009 by atomaly

[BensDR30]

ahhhh so my mechanic told me to gapp to 0.8mm! so i'm gonna follow his lead. thats what they are at currently and the current plugs are platinum.

where in VIC can i buy the gapped to 0.8 NGK BCPR6ES? cos i could only find the BCPR6ES-11

i dont think i know enough about what i'm doing to do that to my coil packs!

i'll change the sparkers first, and if that doesnt fix my problem, then maybe someone can give me a hand doing that fix to the coilpacks! ? (i'll supply beverages )

You won't find them pre-gapped to 0.8mm, you'll have to adjust them yourself (if you insist on using that gap.)

I've been running platinum plugs at 1.1mm and 10psi boost on '96-vintage coilpacks for ages. I'm sure that the coilpacks will start to break down one day, but at present they're just fine.

[wolverine]

You can find them pre-gapped to 0.8mm they are usually listed as BCPR6ES (minus the -11) but it doesn't matter either way. It is worth spending the 2 seconds to check them anyway.

[atomaly]

so i'm planning on cleaning my pod filter tonight, and i'll be cleaning my AFM on tuesday night with Scotty (thanks so much dude)

i'm pretty sure my pod is a "DRY" (blitz??) one so i can just soak it then let it dry ???

is there anything i have to be mindful of when cleaning it ??

Edited December 4, 2009 by atomaly

[atomaly]

okay i think it is this one

Blitz SUS Power POD

[pipster11]

dude it will be your o2 sensor

had the same thing with my outback, exactly the same driving feel and i was younger and poorer and i sold it instead, just try unplugging it and running without it to confirm. its the spark plug looking think that goes into the exhaust just behind the turbo, trace the wires back to find the connector

[atomaly]

dude it will be your o2 sensor

had the same thing with my outback, exactly the same driving feel and i was younger and poorer and i sold it instead, just try unplugging it and running without it to confirm. its the spark plug looking think that goes into the exhaust just behind the turbo, trace the wires back to find the connector

i unplugged it and gave it a good drive and it still had the issues!

hence why i've moved to next solution.....cleaning pod, AFM, and changing the sparkers

[scotty nm35]

I only suggested these things as they are the cheapest option, before replacing hundreds of dollars worth of possibly working parts.

And I would have thought if the O2 sensor was gone it would throw an error but it could still be the case. I will know more when you take me for a drive atomaly.

[atomaly]

I only suggested these things as they are the cheapest option, before replacing hundreds of dollars worth of possibly working parts.

And I would have thought if the O2 sensor was gone it would throw an error but it could still be the case. I will know more when you take me for a drive atomaly.

big thanks for talking sense into me i really dont want to have to spend too much more money on it!

i pulled the pod off and gave it a good wash! (dry type) its a fine metal mesh, so i soaked it for about 15 mins and then washed it off and rinsed thoroughly!!

so much black shit came out of it! the bucket water is black!

its currently drying on my windowseal

hopefully that may improve the air flow!

the AFM will be quite dirty i feel as the inside of the intake pipe near the AFM was just covered in black crap i noticed when i pulled the POD off haha!

[scotty nm35]

That's the problem with the mesh filters. At least it's not oily like my K+N.