Pls Help! Lack of power mid rpms - possible misfire

[02maher]

Originally Posted by NoHaveMSG

Yeah, your LT fuel trims are maxed rich.

Simple stuff first. I would check where the header mounts to the cylinder heads, you may see black soot where it is leaking. I would also check from where the header mounts to the overpipe, and around the O2 sensors.

An indication it is leaking would look like this picture. See the soot?

Thanks a lot I will take it to the garage tomorrow... Any other idea in case I don't find a leak there?

The Evap codes I've been getting with the other ECM could be related?

[NoHaveMSG]

Originally Posted by 02maher

Thanks a lot I will take it to the garage tomorrow... Any other idea in case I don't find a leak there?

The Evap codes I've been getting with the other ECM could be related?

What codes are you getting? Absolutely could be related. I was going to say, for your fuel trims being maxed the AFR is remarkably stable. I was expecting more dramatic fluctuations. That weird stumble it was also bouncing between closed and open loop.

[02maher]

Originally Posted by NoHaveMSG

What codes are you getting? Absolutely could be related. I was going to say, for your fuel trims being maxed the AFR is remarkably stable. I was expecting more dramatic fluctuations. That weird stumble it was also bouncing between closed and open loop.

I have another ECM from another Frs 2013 and whenever I put it I get these codes

P0301 Misfire Cylinder 1
P0453 Evaporative Emission Control System Pressure Sensor / Switch
High Input
P0463 Fuel Level Sensor "A" Circuit High
P2401 Evaporative Emission System Leak Detection Pump Control
Circuit Low
P2419 Evaporative Emission System Switching Valve Control Circuit
Low
C1201 Engine Control System Malfunction


That's weird that I never got them on my actual ECM

[NoHaveMSG]

Originally Posted by 02maher

I have another ECM from another Frs 2013 and whenever I put it I get these codes P0301 P0453 P0463 P2401 P2419 C1201

That's weird that I never got them on my actual ECM

They may be stored codes and not active codes. If you are not getting them currently I don't think it is related. I would just check the simple things as far as leaks first and we can go from there.

[02maher]

Originally Posted by NoHaveMSG

They may be stored codes and not active codes. If you are not getting them currently I don't think it is related. I would just check the simple things as far as leaks first and we can go from there.

They come back after I erase them

[Yoshoobaroo]

Originally Posted by 02maher

They come back after I erase them

Permanent codes require a full drive cycle to go away if the problem is resolved. Could take a bit of a drive to complete it, you have to go through X minutes of idling and X minutes of various speeds.

[orz]

spark plugs/coilpacks ok?

[02maher]

The mechanic saw an oil leak on the driver side of the engine (not sure if it’s related to the issue) so we’re ordering the left valve cover gasket and spark plug tube seal to fix this issue and at the same time we’ll check for leaks and maybe swap some coil packs.

[02maher]

It took me a long time to get the seals from USA as they didn’t have it here in UAE and Oman. So I just replaced them and fixed the oil leak and also swapped the coil packs and spark plugs from left to right but nothing changed in the drivability of the car and I’m still getting the same misfire codes P0300 P0301… We checked the exhaust for a possible leak too but couldn’t find anything. Could it be the intake manifold that’s leaking or something else guys?

[blsfrs]

With weird symptoms, I always rule out a vacuum leak before going to other diagnoses.

[02maher]

I removed and sealed again the air intake manifold but it didn’t change anything. So I just took it today to a garage that’s specialized in sports car but they’re a bit expensive… They checked the car for half an hour and they told me it’s definitely the direct injectors (su00304461) and quoted me 1200usd. What do you think guys ����*♂️ ?

[02maher]

Update, just removed the port injectors and the direct injectors. DI looked all the same with intact and properly fixed O ring but quite dirty and with carbon built up. The port injectors on the passenger side where I’m having the misfire are both black (way darker than the other side). Took all the injectors to a specialist to have them checked and cleaned and he just told me that the dark injectors indicate a vacuum leak. Now where is this leak I don’t know but I might put a supercharger (sprintex 210) which will sit more heavily than the plastic intake manifold which can be problematic ??
If you guys have any leads where and what to check that would be much appreciated.

[blsfrs]

Just double check all of your hoses, connections, and seals when putting it back together. Hopefully, the leak will be fixed during reassembly.

[02maher]

Originally Posted by blsfrs

Just double check all of your hoses, connections, and seals when putting it back together. Hopefully, the leak will be fixed during reassembly.

So yes I definitely had some vacuum leak somewhere but not only… one of the direct injectors came out faulty and not spraying properly.

I learnt that the engine uses sometimes more the port and sometimes more the direct injectors depending on the rpms and engine load, so I guess when I was soliciting the engine beyond a certain load at a certain rpm, it starts to use the DI and that’s why the misfire and shaking happen there.

I’m getting a new injector soon and will keep this post updated for future reference.