Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community - FT86CLUB - View Single Post - 2013 FR-S Misfire and Rough Idle

aemravan · 05-04-2019, 06:26 PM

Hello everyone, I'm new to the forum, finally approved to post. I have spent the last 2 weeks doing research on my issue and am nearing a dead-end and was hoping to see if maybe someone had better ideas.

The car is a 2013 Scion FR-S that I picked up wrecked out of Florida for my fiance. Light front end damage, no airbag fired, just took out the radiator support above the crash bar. I have the body all done from a Series 10 front clip I found not far so everything pretty much swapped over. Was hoping to have a quick weekend project, and would have been that way if it wasn't for an engine issue I then encountered...

The car started and drove off the delivery truck, down the street and into the garage. had a big vacuum leak due to cracked intake pipe/box etc past the maf sensor, no biggie. After the bodywork was swapped over, I tapped off the cracks in the intake pipe and fired the car up to add coolant. The car ran for probably a good 15 minutes while I did some other stuff with the fenders and burped the coolant system.

During this time I saw the gas line came on, so with the car running (I know I know) i popped the lid and added some gas from the canister I had (93 pump im 95% certain.. slight chance was 87 but highly doubt it)

Car kept running, after about 5 minutes I closed the hood and went for a spin around the neighborhood. Car felt awesome, im excited to get it on the road, after this I drove it to the gas station right across the street from the neighborhood.

Filled up 93 pump gas, and topped it off like I do my GS400 and Supra, so it was really full. I go to crank the car on and its having issues starting, finally starts but is running rough as hell. The CEL comes on pretty soon and goes into the limp mode with the traction and abs lights on. I get it home and park it.

Over the next couple of days I have read a few codes, but only 1 consistently stays on, and is first to come on: P0303 cylinder 3 misfire detected. Other codes I have seen is Bank 1 Lean (cant remember code).

Here is what I have done so far... (thinking it had to be fueling related..maybe car sat way long with bad gas, had a crapy filter, had junk in the tank, etc ect):

1) removed and tried to clean out the injectors (fed 12 volts while pumping some fuel). They all seemed to fire ok.

2) Removed coils and swapped to a different cylinder
3) changed all plugs (I am not a master at plug changes, can do all 4 in maybe 2 hours start to finish lol)

4) changed the intake manifold (thinking maybe there was a fracture) with all new gaskets.

5) Changed all seal on the injectors (including 1 of the direct port injector seals -this ended up not being all that bad either) and also swapped them places to see if problem would go to a different cylinder

6) opened up the tank and drained about 1 gallon of fuel out of it in case I was over pressuring the system somehow by topping off..

7) checked all possible fuses under the hood

8) checked and double checked all vacuum line connections.. I don't know how I could miss something with this after so much looking..

9) swapped MAF sensor

10) installed an undamaged intake pipe

last night after the last steps did not work I am simply out of ideas.. the car is on a recall for the valve springs, but I would know a failed spring... the engine simply seems to misfire, no weird rattling noises.

Not sure if maybe the coil wire got damaged though I don't see how since its way down under the intake and ran perfectly fine for like 20-30 minutes until I filled up.

My only idea is maybe trying a different fuel ecu thats mounted to the 1st bank...? Since the Lean code is also coming on (and after testing injectors as well as swapping them place, and doing new plugs with a different coil on each cylinder) could it be that this cylinder is simply not getting a fire pulse from the injector ecu......?

Any and all input would be VERY much appreciated as I am starting to lose my mind...

Thanks all,

Roman

I have not done a compression test yet either simply because I am pretty certain nothing mechanically is wrong, but tell me if I am wrong..

05-04-2019, 06:26 PM	#1
aemravan Senior Member Join Date: May 2019 Drives: 2013 Scion FR-S Location: Charlotte, NC Posts: 135 Thanks: 27 Thanked 79 Times in 47 Posts Mentioned: 0 Post(s)	2013 FR-S Misfire and Rough Idle Hello everyone, I'm new to the forum, finally approved to post. I have spent the last 2 weeks doing research on my issue and am nearing a dead-end and was hoping to see if maybe someone had better ideas. The car is a 2013 Scion FR-S that I picked up wrecked out of Florida for my fiance. Light front end damage, no airbag fired, just took out the radiator support above the crash bar. I have the body all done from a Series 10 front clip I found not far so everything pretty much swapped over. Was hoping to have a quick weekend project, and would have been that way if it wasn't for an engine issue I then encountered... The car started and drove off the delivery truck, down the street and into the garage. had a big vacuum leak due to cracked intake pipe/box etc past the maf sensor, no biggie. After the bodywork was swapped over, I tapped off the cracks in the intake pipe and fired the car up to add coolant. The car ran for probably a good 15 minutes while I did some other stuff with the fenders and burped the coolant system. During this time I saw the gas line came on, so with the car running (I know I know) i popped the lid and added some gas from the canister I had (93 pump im 95% certain.. slight chance was 87 but highly doubt it) Car kept running, after about 5 minutes I closed the hood and went for a spin around the neighborhood. Car felt awesome, im excited to get it on the road, after this I drove it to the gas station right across the street from the neighborhood. Filled up 93 pump gas, and topped it off like I do my GS400 and Supra, so it was really full. I go to crank the car on and its having issues starting, finally starts but is running rough as hell. The CEL comes on pretty soon and goes into the limp mode with the traction and abs lights on. I get it home and park it. Over the next couple of days I have read a few codes, but only 1 consistently stays on, and is first to come on: P0303 cylinder 3 misfire detected. Other codes I have seen is Bank 1 Lean (cant remember code). Here is what I have done so far... (thinking it had to be fueling related..maybe car sat way long with bad gas, had a crapy filter, had junk in the tank, etc ect): 1) removed and tried to clean out the injectors (fed 12 volts while pumping some fuel). They all seemed to fire ok. 2) Removed coils and swapped to a different cylinder 3) changed all plugs (I am not a master at plug changes, can do all 4 in maybe 2 hours start to finish lol) 4) changed the intake manifold (thinking maybe there was a fracture) with all new gaskets. 5) Changed all seal on the injectors (including 1 of the direct port injector seals -this ended up not being all that bad either) and also swapped them places to see if problem would go to a different cylinder 6) opened up the tank and drained about 1 gallon of fuel out of it in case I was over pressuring the system somehow by topping off.. 7) checked all possible fuses under the hood 8) checked and double checked all vacuum line connections.. I don't know how I could miss something with this after so much looking.. 9) swapped MAF sensor 10) installed an undamaged intake pipe last night after the last steps did not work I am simply out of ideas.. the car is on a recall for the valve springs, but I would know a failed spring... the engine simply seems to misfire, no weird rattling noises. Not sure if maybe the coil wire got damaged though I don't see how since its way down under the intake and ran perfectly fine for like 20-30 minutes until I filled up. My only idea is maybe trying a different fuel ecu thats mounted to the 1st bank...? Since the Lean code is also coming on (and after testing injectors as well as swapping them place, and doing new plugs with a different coil on each cylinder) could it be that this cylinder is simply not getting a fire pulse from the injector ecu......? Any and all input would be VERY much appreciated as I am starting to lose my mind... Thanks all, Roman I have not done a compression test yet either simply because I am pretty certain nothing mechanically is wrong, but tell me if I am wrong..