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FLat spot at 4000rpms

Just checked the breather hose. The oil was barely a mist, could barely wipe any on to my finger even so I'm thinking likely not the issue.

Spark plugs looked ok to me too. I've sent pics to a mechanic mate in high resolution so he can read them for me too.

I'm at a loss. Might have to wait till Suzuki has a loan car for me and leave it with them till fixed. It's a 90min drive which is a pain.

I feel your pain on this Scott.

It'd be nice to compare your car with another Swift Sport. Just to see how clear this problem is.

I've got 14k miles on my Sport, and have never experienced this problem to date. It gets driven hard very often too. But always warmed-up properly before any fun begins. It's never missed a beat yet. In fact, if anything it seems to be getting better with miles. It still only has the stock exhaust on it - but it's beginning to sound better with miles. Like my 32S before it, it seems to get quicker as the miles pile on too.

Such a shame that you're not experiencing the same right now. But, do keep us posted on developments. Perhaps we will all learn something from this eventually.

A couple of possibilities. Have you checked all the air intake connections from the air filter to the engine? They can work loose. Have the gaps on the spark plugs been checked?

I yesterday took apart much of the intake in order to pull the plugs. I was pretty particular with everything and saw no issue with any of the intake connections.

The gaps on the spark plugs haven't been checked. But they are the factory original NGK IR plugs. They are only 3000kms old. And the car ran perfect on them for the first 2000+kms.

I have a mate that has said he reckons it sounds engine management or sensor based. But id have thought they'd throw a code.

.another reckons it is boost leak, likely wastegate or recirc valve or something. But i wouldn't have thought it would be so consistently at the exact same revs. As it happens at 75percent throttle at the same revs as 100percent throttle..

I quit. Will drop at susuki. The problem is he reckons he can't even feel it so he isn't going to know if he has fixed it or not. He even suggested maybe im just not used to what boost feels like and that boost happens at 4k! Which isnt even close. Oh well, was hoping for a quick answer, looks like instead it may be a long game..

Well I have done a little more investigative work. I'm not a mechanic but I feel I've found something not quite right.

Engine warmed to operating temp. Take the oil fill cap off. It is heavily pressurised blowing air, some small amount of smoke and splutterings of oil or fluid. I held a rag over it but was hard to tell if there was water or anything in it as the oil is so clean being 100kms old.

Regardless, it is my understanding that this should be not be pressurised. This can either point to blow-by from damaged piston rings or to a PCV system that isn't working.

Would anyone with the same 4000rpm glitch like to try this same test and see what results you get?

Is anyone with a sss that is working perfectly able to try the same test and see if yours is pressurised in this way?

This could point us quickly in the right direction.

Similar issue- Also from Barbados. Used an octane, issue still persists.

Had a diagnostic done also, no faults.

Also at a loss!!!!!!

Are you guys that experience this all from hotter parts of the world?...it could be something to do with inlet temperatures. If they are above a certain temp the ecu may retard timing to avoid pre-ignition. Just a thought.

Quote from Scott on May 19, 2020, 1:15 am

Well I have done a little more investigative work. I'm not a mechanic but I feel I've found something not quite right.

Engine warmed to operating temp. Take the oil fill cap off. It is heavily pressurised blowing air, some small amount of smoke and splutterings of oil or fluid. I held a rag over it but was hard to tell if there was water or anything in it as the oil is so clean being 100kms old.

Regardless, it is my understanding that this should be not be pressurised. This can either point to blow-by from damaged piston rings or to a PCV system that isn't working.

Would anyone with the same 4000rpm glitch like to try this same test and see what results you get?

Is anyone with a sss that is working perfectly able to try the same test and see if yours is pressurised in this way?

This could point us quickly in the right direction.

Hi Scott, I have also experienced this glitch but I can't replicate the pressurized oil cap issue. The cap comes off normally with no air spluttering or smoke that I've noticed.

Good thought Moyz. Unfortunately not the case as I'm from Melbourne Australia and have been experiencing this in 5 degree weather recently.

There is obviously an issue here. If in different parts of the World with different fuel and all sorts of different conditions we are experiencing the same thing.

I'm going to ask Suzuki to replace my pcv on Tuesday. Its a cheap part. It's only a guessing game for me but if guessed right on a cheap part then happy days.

They are also going to check for any ecu updates. I doubt this will net anything as hundreds of people would have the same issue if it was that.

If this suzuki dont find it I'm taking it to a melbourne specialist with good reviews and will pay for the fault finding then have to chase Suzuki over it later.

I'm just hoping it's something simple. Not piston rings or something.

Vacuum leak or pcv is my hope atm.

Quote from Moyz on May 19, 2020, 10:47 pm

Are you guys that experience this all from hotter parts of the world?...it could be something to do with inlet temperatures. If they are above a certain temp the ecu may retard timing to avoid pre-ignition. Just a thought.

Good point as the issue for me is/was not constant. I recently had my vehicle serviced and have been trying to replicate the issue for a few days now, before there would definitely be some hesitation but now the acceleration is quite linear throughout the rev range, turbo lag considered.

I've changed to the HKS iridium spark plugs and HKS oil filter with a Greddy drop in panel filter. Initially i used Valvoline 5w-30 oil, which seemed to bog the engine down and switched out for Mobil1 5w-30 which made the engine appear more willing.

I haven't had much opportunities to really push the car but I have noticed an improvement, possibly making the issue less apparent. Now i'm curious enough to test drive some other ZC33s to see if there's an actual difference.