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Loss Of Power After Service

PhilGTR

By PhilGTR,
in Engines & Forced Induction

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PhilGTR Rising Star

PhilGTR

Posted
Posted

Hey guys,

I just got a full service done for my r33 gtr and now i feel that it has lost power and response.

So basically i got all the oils changed, fuel filter, spark plugs, etc.

The boost seems to be normal and all but there is a noticeable power loss right through the rev range. The only thing it could be is the spark plugs?? But its really smooth. Any ideas???

Thanks

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PhilGTR Rising Star

PhilGTR

Posted
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Posted
Agreed, timing, see if they adjusted the handbrake, its a long shot, but not impossible.

Well i did ask him to check my timing belt, but my car is stock standard? When you remove the cover can u adjust the timing??

33SOM Experienced

33SOM

Posted
Posted
Well i did ask him to check my timing belt, but my car is stock standard? When you remove the cover can u adjust the timing??

They remove the crank angle sensor to check the belt. So yes if they didnt put it back in the original spot your timing has been changed.

Adriano Grand Master

Adriano

Posted
Posted

When they take the cover off, they have to adjust the timing, check the CAS at the front of the exhaust can, and see if the mounting bolt witness marks from where it used to be are different to where it is now bolte.ie: it has been rotated(probably clockwise)from where it previously was.

MrStabby Grand Master

MrStabby

Posted
Posted

If they used a much thicker and/or cheaper oil than what was in it before that could be the answer, but i'd guess spark plugs are more likely to be the culprit. Find out what plugs and what oil they used, and post it up.

Cubes Grand Master

Cubes

Posted
Posted
Well i did ask him to check my timing belt, but my car is stock standard? When you remove the cover can u adjust the timing??

Yes.. If they haven't dropped a timing light on it and guessed where it was prior it may very well be running either less or more ignition.

PhilGTR Rising Star

PhilGTR

Posted
  • Author
Posted

Hmm so I asked my mechanic today if he touched the CAS he said no. And he said he put in the same type of platinum spark plugs i had in before. And he reckons it feels good and there is nothing wrong with it. But then sometimes when i drive it, it does feels good and other times it doesnt feel as quick. Maybe its just me paranoid! But I am pretty sure its lost a bit of response down low although the top end feels the same.

Could it be the spark plugs not gapped correctly? But he was saying that it would run like crap if they werent gapped properly.

Is it possible to adjust the ignition timing without a dyno to give bit better response without damaging my motor?

Or maybe i should just accept the fact that its stock standard and the exhaust is restricting it lol.

R31Nismoid Grand Master

R31Nismoid

Posted
Posted

Sounds like a bit of paranoia creeping in haha :)

Although, i would be using just a normal set of coppers gapped @ 1.1 for a stock GTR

Plati, Iridi etc. Just a waste of coin. The good ole coppers for less than $20 a set win hands down everytime.

- You might have a slightly dirty AFM, or loose perhaps.

- Maybe the coils dont have a connector on firmly, or similar across the other connectors

- A cooler pipe might have a slight leak, although it doesnt sound like that.

Basically, anything he needed to remove/touch for a service you need to follow and have that checked.

Its just retracing the parts he removed as one of them possibly isnt sitting right/the way it should

PhilGTR Rising Star

PhilGTR

Posted
  • Author
Posted
Sounds like a bit of paranoia creeping in haha :)

Although, i would be using just a normal set of coppers gapped @ 1.1 for a stock GTR

Plati, Iridi etc. Just a waste of coin. The good ole coppers for less than $20 a set win hands down everytime.

- You might have a slightly dirty AFM, or loose perhaps.

- Maybe the coils dont have a connector on firmly, or similar across the other connectors

- A cooler pipe might have a slight leak, although it doesnt sound like that.

Basically, anything he needed to remove/touch for a service you need to follow and have that checked.

Its just retracing the parts he removed as one of them possibly isnt sitting right/the way it should

Will coppers make that much difference? I am planning to slap an exhaust on it soon.

Well I seem to get good boost response according to the stock guage, full boost a bit before or on 3k rpm i think so i dont think cooler pipe would be loose?

I will have a look at my afm, as he did remove my airbox and cleaned my panel filter.

Coils havent checked but will open it up and have a look.

R34GTFOUR Mentor

R34GTFOUR

Posted
Posted

so did he actually check your timing belt? Cause if he says he checked your timing belt and didnt touch the cas hes talking bs. Pop your hood and have a quick look at the cas, it has three bolts going through it. If you can see marks where the bolts used to be before then you know that it hasnt been set back in its original postion and if hes retarded the timing abit you will notice a difference. Ask him to put a timing light on your car and see what it is set at, if he knows what he is doing it will take less than a minute to do.

In saying that, people get paranoid when they hand their car to other people and start "noticing" things that they did see before haha

R34GTFOUR Mentor

R34GTFOUR

Posted
Posted
Will coppers make that much difference? I am planning to slap an exhaust on it soon.

Well I seem to get good boost response according to the stock guage, full boost a bit before or on 3k rpm i think so i dont think cooler pipe would be loose?

I will have a look at my afm, as he did remove my airbox and cleaned my panel filter.

Coils havent checked but will open it up and have a look.

also how did he clean your filter? is it a k&n filter that he has re-oiled? The oil used on those filters can affect our afms..

PhilGTR Rising Star

PhilGTR

Posted
  • Author
Posted
also how did he clean your filter? is it a k&n filter that he has re-oiled? The oil used on those filters can affect our afms..

He said he didnt open it up to check my belt. so that hasnt changed at all. I have got a HKS air filter i just had a look and it looks clean and the afm looks good too. The only thing is the spark plugs! because normally i feel the most power come in around 4000rpm and levels out a bit at higher rpms, but now it just feels pretty linear all the way through without the sudden power kick in. Had to explain!

WRRR Rising Star

WRRR

Posted
Posted
He said he didnt open it up to check my belt. so that hasnt changed at all. I have got a HKS air filter i just had a look and it looks clean and the afm looks good too. The only thing is the spark plugs! because normally i feel the most power come in around 4000rpm and levels out a bit at higher rpms, but now it just feels pretty linear all the way through without the sudden power kick in. Had to explain!

Wild thought - you said AFM (singular) looks ok. You have got 2. If one is playing up the airflow reading to the ECU will be low (averages both).

Or maybe a bit of paranoia - now just go check under the bed.

evesdropping Collaborator

evesdropping

Posted
Posted

I always get the same feeling when I get my car serviced. Not just the skyline, but every car I have had. It's weird, the car feels smoother and nicer but slightly slower. I ended up deciding it was all in my mind. it is interesting that you say the same thing.

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