Lumpy idle , bogging down under acceleration

[MATT BOON]

checked the plugs , they don't look worn out

Changed the coilpacks for uprated ones

Still happening ?


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[DeanS15]

What about bad air flow meter? Do you know anyone that can swap with yours to see if it runs any better?

 

[MATT BOON]

It's got a Z32 so would have to be the same I guess


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[sibbers]

Checked for boost or vac leaks? Most likely cause of lumpy idle and leak on boost causes overfueling which can ruin your fun. Normal places to check would be last things you changed, hoses, BOV or if you're really unlucky maybe the inter cooler itself.

 

[MATT BOON]

Yeah I've checked pretty much every pipe and all seems fine to me


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[MATT BOON]

Turbo seems to spool fine too :/


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[als_jordan]

Lambda sensor? Is it ok above 2000rpm or so?

 

[MATT BOON]

It bogs down about 3500-4000rpm when accelerating and idle just seems crappy and lumpy


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[pegliobaglio]

Have you tried disconnecting the O2 sensor bud? I had lumpy idle before when I unplugged it was fine . So got myself a new one

 

[Clarkey]

o2 doesn't do anything under acceleration. I bet you anything it's the MAF, disconnect it and see if the idle improves.
Sometimes they can be fixed by cleaning the hot wire, but be careful as they are very delicate.

 

[S15_SAM]

I would think Air flow meter, try and find a good donor z32 one.

Does it it bog down under full throttle only or partial throttle too? Is it just a lack of power or a full missfire?

 

[MATT BOON]

Yeah I'll check the AFM then ,
Bogs down slow / fast it doesn't matter


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[sibbers]

Is it worse when hot or the same regardless of wether the engine has warmed up or not? If it's better when cold it could be temp sensor. Lambda is a good suggestion too.

 

[S15AK]

for what plugs cost I'd replace them just to be sure. I had a hairline crack in one of mine which caused similar issue, but on a quick inspection of the plugs I didn't spot it at first.

 

[MATT BOON]

Yeah man new plugs should be here tomorrow ! Hopefully that's the issue as i cba messing about with a new AFM or any sort of sensor ! I just want it working


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