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Diagnosing a (sort of) Engine Miss


Shibe

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Aight this ones proving a little difficult for me and it's gonna be even harder to explain.

07 S-GT ej20 single turbo blah blah. The cars a good wee thing but sometimes I find it has a bit of a rough sort of 'skip' or hesitation. For example, down shift and decelerating the car and sort of jerk a little bit and same thing when applying more throttle. It's not very consistent though so some days it will do it, some days it won't. Idle fluctuates a little bit but it sits around the RPMs you'd expect when the engine is cold or at operating temps.

 

So far I have changed my spark plugs (were due anyway) and cleaned the MAF sensor.

One suspicion I have is my sort of bundy intake side (just half the airbox + filter) as pictured. Whether this could be a culprit I have noooo clue. 

 

7MWfpl4.jpg

 

 Other than this, the car seems to drive fine. Boosts fine, accelerates as it should. 

I thought of cleaning the throttle body to see if that would make a difference. Anyone else have any ideas/experience with this kinda issue? The car is great but I feel like it could be running a bit better...

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The air box and air filter might help resolve this. Got to a local pick-a-part (if you have one), or get one from a wreckers for an air box - the cold air intake side of it. The air box clamps and seals the air filter to the air box.

Could also be a vacuum/boost leak. See if you can't hear anything when it's idling, and a spray bottle of soapy water handy to spray on something it might be leaking from.

Last thing that I would be the suspect would be the ignition coils. Can get them tested at an auto sparky.

 

I'd honestly sort the air box situation first - if you can find the parts in your area, will be a cheap and easy fix.

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33 minutes ago, Individualities said:

The air box and air filter might help resolve this. Got to a local pick-a-part (if you have one), or get one from a wreckers for an air box - the cold air intake side of it. The air box clamps and seals the air filter to the air box.

Could also be a vacuum/boost leak. See if you can't hear anything when it's idling, and a spray bottle of soapy water handy to spray on something it might be leaking from.

Last thing that I would be the suspect would be the ignition coils. Can get them tested at an auto sparky.

 

I'd honestly sort the air box situation first - if you can find the parts in your area, will be a cheap and easy fix.

 

Luckily I still have the box but just not the other part that that sit at the front and feeds cold air in. 

 

All good stuff to try. Thanks man. 

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2 hours ago, Shibe said:

 

Luckily I still have the box but just not the other part that that sit at the front and feeds cold air in. 

 

All good stuff to try. Thanks man. 

 

Ohh so to clarify, you have the entire box - both sides of the filter, just not the snorkel bit?

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4 hours ago, Andy_Mac said:

 

Ohh so to clarify, you have the entire box - both sides of the filter, just not the snorkel bit?

 

Hmm unsure now. Doesn’t help that I don’t know what the factory assembly looks like 

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Probably better to have that attached to hold the filter properly. The hole in the top and bottom are enough to pull air through. 

Was gonna say you could try my snorkel as that's all I've got left from mine as chances are it’s the same but realised you're down south. Thought you were up in Auckland

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1 hour ago, Andy_Mac said:

Probably better to have that attached to hold the filter properly. The hole in the top and bottom are enough to pull air through. 

Was gonna say you could try my snorkel as that's all I've got left from mine as chances are it’s the same but realised you're down south. Thought you were up in Auckland

 

Yeah the filters held in by two screws at the top which isn’t all too flash. Unfortunately there’s no clips for the box..  If you’re okay with shipping I’d be happy to pay for it. May as well try it. 

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1 hour ago, Shibe said:

Yeah the filters held in by two screws at the top which isn’t all too flash. Unfortunately there’s no clips for the box..  If you’re okay with shipping I’d be happy to pay for it. May as well try it. 

 

2 screws? That's sounds totally not ideal... 

If there's a pick-a-part in your area, check them out first, or a wreckers.

 

If Shibe just needs the clips, throw em in an envelope @Andy_Mac

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Yea hard to find a steal these days. 

Those clips will set you back 19usd including shipping from partsouq. 

Or 95usd including the intake snorkel. Shipping cost for the snorkel is what makes it jump so high. 

Could try some of those other sites in @preim’s thread since some apparently do better shipping fees than partsouq.

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On 10/31/2018 at 7:47 PM, Andy_Mac said:

Yea hard to find a steal these days. 

Those clips will set you back 19usd including shipping from partsouq. 

Or 95usd including the intake snorkel. Shipping cost for the snorkel is what makes it jump so high. 

Could try some of those other sites in @preim’s thread since some apparently do better shipping fees than partsouq.

 

One trademe wrecker has the air box for $120 and the duct for $50. Ffs lol.

 

Just spent $340 on two new tyres. Ahhhh the joys of cars. An Aftermarket intake requires tuning right?

 

Edit: Just spoke to friend of mine and he said I can have the factory stuff off his S-GT if I help him install his aftermarket intake. Sounds like a good deal to me :D

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1 hour ago, Shibe said:

One trademe wrecker has the air box for $120 and the duct for $50. Ffs lol.

 

Just spent $340 on two new tyres. Ahhhh the joys of cars. An Aftermarket intake requires tuning right?

 

Edit: Just spoke to friend of mine and he said I can have the factory stuff off his S-GT if I help him install his aftermarket intake. Sounds like a good deal to me :D

 

Yup. That's why I love Pick-a-part places. They're usually pretty cheap. Got me a airbox resonator (sits inside the drivers side guard) for $10. I believe a full airbox etc is like $20.

 

That is a good deal. Take it. Shouldn't be too hard to install what ever intake he gets.

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13 minutes ago, Individualities said:

 

Yup. That's why I love Pick-a-part places. They're usually pretty cheap. Got me a airbox resonator (sits inside the drivers side guard) for $10. I believe a full airbox etc is like $20.

 

That is a good deal. Take it. Shouldn't be too hard to install what ever intake he gets.

 

Exactly! and will be something new to learn 

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