[Jurgeenh]

Im new in the forum and i have a question i have a 335xi e90 n54 engine
When floor my car over 4k or 5k revs appears on cluster a half yellow engine
The first time i noticed this i tought i was the famous HPFP but i dont think so,
I never had long crancks my engine start easy every time i touch the boton, even when this symbol appears my car still running strong, if i turn off the engine and then restart the symbol its gone, i have almost one year w this symtoms, what could be?
Im concerned about stability at speeds over 100mph, when hit a pothole or an uneven surface on street at high speed my car jerks to one side and steering ussually follows the imperfections on the road, i dont know if its for the runflats or its anything wrong w the car.

[Blackhawk36]

You need a code reader. The SES light will store a code.

Get ready to be flamed about driver over 100 mph on potholed roads.

[e92_enthusiast_1]

How many miles on the car? When's the last time you changed your plugs and coils? Have you ever had it checked for carbon buildup? Also, does it ever store any codes? Try to get some codes. The symptom "sounds" like HPFP imo but there's too many unknowns to be sure.

Originally Posted by Jurgeenh

Im new in the forum and i have a question i have a 335xi e90 n54 engine
When floor my car over 4k or 5k revs appears on cluster a half yellow engine
The first time i noticed this i tought i was the famous HPFP but i dont think so,
I never had long crancks my engine start easy every time i touch the boton, even when this symbol appears my car still running strong, if i turn off the engine and then restart the symbol its gone, i have almost one year w this symtoms, what could be?
Im concerned about stability at speeds over 100mph, when hit a pothole or an uneven surface on street at high speed my car jerks to one side and steering ussually follows the imperfections on the road, i dont know if its for the runflats or its anything wrong w the car.

[Jurgeenh]

I have 60k miles on the car i never changed coils and nothing just filters and oil, i just have like year and a half with my car the only issue i had was the water pump easy fix the pump cost me 512 dlls brand new and 100 bucks for mechanic and oil change, how can i check if my car has carbon boil up?

[Jurgeenh]

Buildup

[e92_enthusiast_1]

It's the intake valves under your intake manifold. kinda a pain to take it off and look. There's a way to do it with a borescope too that doesn't require removing the manifold. At that much mileage you probably have some. That's why I was curious if you've ever changed plugs or anything else. It could be a combination of both those also. Old plugs + buildup.

DIY-Intake Valve Cleaning
BMW 335 Valve Cleaning N54

Originally Posted by Jurgeenh

Buildup

[DetectiveLoki]

I have similar issue too which occurs randomly when I go WOT. My car get the half engine light and loses half the power until I turn it off and turn it back on. My OBD2 reader doesn't have any error code. I took it to a local BMW mechanic and they scanned it with their tool and they said it could be anything; I.e. vaccumm leak etc.. I already did the shell blasting and changed the sparkplugs couple months ago. I currently have a small oil leak which I will be bringing it to the shop so they can change the gasket covers. I wonder if that has anything to do with it.

[e92_enthusiast_1]

How many miles on your car? Have you ever replaced the HPFP, cause the half engine light's kinda notorious when the HPFP goes. And do you mean the gasket on your valve cover? I don't think that would cause your half engine light, probably will fix your oil leak though.

Originally Posted by DetectiveLoki

I have similar issue too which occurs randomly when I go WOT. My car get the half engine light and loses half the power until I turn it off and turn it back on. My OBD2 reader doesn't have any error code. I took it to a local BMW mechanic and they scanned it with their tool and they said it could be anything; I.e. vaccumm leak etc.. I already did the shell blasting and changed the sparkplugs couple months ago. I currently have a small oil leak which I will be bringing it to the shop so they can change the gasket covers. I wonder if that has anything to do with it.

[DetectiveLoki]

Originally Posted by e92_enthusiast_1

How many miles on your car? Have you ever replaced the HPFP, cause the half engine light's kinda notorious when the HPFP goes. And do you mean the gasket on your valve cover? I don't think that would cause your half engine light, probably will fix your oil leak though.

Yeah in 2011 when it was 16k miles. My car is a 2008. I just hit 66,300 miles.

[Jurgeenh]

And how do you clena up all that carbon? That build up can broke the vañves or damage the engine exactly what does the carbon can do?

[Hidden]

Originally Posted by Jurgeenh

Im concerned about stability at speeds over 100mph, when hit a pothole or an uneven surface on street at high speed my car jerks to one side and steering ussually follows the imperfections on the road, i dont know if its for the runflats or its anything wrong w the car.

Just curious, do you always cruise unfamiliar streets in excess of 100mph?

[e92_enthusiast_1]

Without getting too much into it, in general it just affects performance. Check these out:

DIY-Intake Valve Cleaning
BMW 335 Valve Cleaning N54

Originally Posted by Jurgeenh

Buildup

Originally Posted by Jurgeenh

And how do you clena up all that carbon? That build up can broke the vañves or damage the engine exactly what does the carbon can do?

[Bluesnake01]

Originally Posted by DetectiveLoki

I have similar issue too which occurs randomly when I go WOT. My car get the half engine light and loses half the power until I turn it off and turn it back on. My OBD2 reader doesn't have any error code. I took it to a local BMW mechanic and they scanned it with their tool and they said it could be anything; I.e. vaccumm leak etc.. I already did the shell blasting and changed the sparkplugs couple months ago. I currently have a small oil leak which I will be bringing it to the shop so they can change the gasket covers. I wonder if that has anything to do with it.

The oil leak has nothing to do with the reduced power light. Its just annoying leaving stains on the floor and adding oil. Its also very pricey even though the gaskets cost $30? Takes lots of patience and unscrewing crap, even worse for those that have the oil cooler.

The engine malfunction can be more than just the carbon build up and HPFP. It can also be the VANOS solenoids and the injectors. I cleaned my solenoids and it never did it anymore. Also a vaccum leak. You can check the lines next to the filters see if there's any leakage or the charge pipe itself. Cleaning the solenoids takes no more than 30 mins, very easy and might save you the headache. Also, some 335i's from 07 to 09 had a recall for the injectors, so new free injectors if your car is between those years.

[DetectiveLoki]

Originally Posted by Bluesnake01

The oil leak has nothing to do with the reduced power light. Its just annoying leaving stains on the floor and adding oil. Its also very pricey even though the gaskets cost $30? Takes lots of patience and unscrewing crap, even worse for those that have the oil cooler.

The engine malfunction can be more than just the carbon build up and HPFP. It can also be the VANOS solenoids and the injectors. I cleaned my solenoids and it never did it anymore. Also a vaccum leak. You can check the lines next to the filters see if there's any leakage or the charge pipe itself. Cleaning the solenoids takes no more than 30 mins, very easy and might save you the headache. Also, some 335i's from 07 to 09 had a recall for the injectors, so new free injectors if your car is between those years.

Hmm none of the SA ever mentioned anything about injector recall...

[Malibu1]

HPFP
Plugs
Injectors
Coils.......

[Bluesnake01]

Originally Posted by DetectiveLoki

Hmm none of the SA ever mentioned anything about injector recall...

See attachment.

Let them know, there shouldn't be any reason for them to give you crap. Who knows, this might fix your problem.

[John 070]

odd that every time this scenario comes up, nobody mentions VANOS solenoids.

[Bluesnake01]

Originally Posted by John 070

odd that every time this scenario comes up, nobody mentions VANOS solenoids.

Im pretty positive I mentioned that earlier

[John 070]

Originally Posted by Bluesnake01

Im pretty positive I mentioned that earlier

You did indeed!

My point is that everyone looks for $3k solutions, before looking for the simplest most basic and common ones. It's like when your pc can't get to the internet, start logging into the router and switch and then call your internet provider. Couldn't be the patch cable, nah, too easy....

[Jurgeenh]

Thanks for the info guys im giong check the carbon build up threads.
Well about the bad shape roads thats because i use a lot this car on mexcian roads and highways and almost all are in bad shape, different thing on usa, on those roads my car feels like an airplane but even on us higways you can find bumps and when hit a little bump it feels scarry, this could be the alignment, its nesesary the dealer? Or bigeston or pirelli can do it?

[Blackhawk36]

He said in the first post he has the reduced power half yellow engine symbol. That means he definitely has stored BMW codes. That is the easy way to figue out the problem. At 60k miles he definitely has MAJOR carbon on the intakes but that by itself probably won't cause his codes. VANOS solenoids definitely would and they usually reset on a restart.

[Jurgeenh]

Hello my friends im back i have 63k miles on my 335 i cleaned up the vanos solenoids w gasoline and compresed air and i just feel a slight increase in throtle response but when i pass 4-5k rpm again this simbol of engine malfuction, i need replace vanos solenoids? Or clean up the valves? How i can clean the valves?