I need your mechanical knowledge
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Registered User
Joined: Mar 2019
Posts: 34
From: Bel Air, MD
Rep Power: 0
I need your mechanical knowledge
I dropped my engine a few months ago and at the time it was running fine. I had a stage 2 tune on the car from RT Tunes.
When the engine was out I upgraded/replaced the following:
-clutch/flywheel
-GT2 Slave Mod
-SRM K24+ Turbos (non-VTG)
-Denso #3245 Spark Plugs
-ID1300s
-IPD 82mm Plenum and GT3 TB
-Pinned Camshafts
-Waterpump
-Intake Pipes
-HKS EVC
-Timing Chain Tensioners
-Coolant Elbows & Pinned pipes
-Any necessary o-rings
-Fuel Filter
The harness that lays on top of the engine was removed and reinstalled.
The engine was reinstalled into the vehicle and oil pressure was built before start up. The COBB OTS 1300 map was uploaded to the car. There was a loud metal noise that was heard but it was unsure the cause. Once pressure was built the engine was started and the metal noise was even louder and found to be coming from the bank 2 timing chain tensioner. The tensioner was removed and found to be installed upside down. The tensioner was installed correctly and the loud noise was no longer present. The engine was started but was found to die. Once all of the intercooler piping, y-pipe, etc was hooked up the car would start and idle.
HOWEVER, It seemed as if Bank 2 was not running. The exhaust manifold on Bank 1 was reaching appropriate operating temperature but the exhaust manifold on Bank 2 was probably only 90°.
There were CEL codes misfires in cylinder 4 and 5, and an additional code for random misfires
I then used the durametric and looked at my cam deviation assuming that was the issue. Bank 1 was -3° and Bank 2 was -3.02°.
The injector wiring on cylinder 4 and 5 were checked with the pins on the main circular harness and they were correct.
There was fuel found to be coming from a crack in the exhaust manifold so we know fuel was getting there. (The crack has been fixed)
The coil pack on cylinder 4 was pulled along with the spark plug. The spark plug was found to be damp. With the fuel pump fuse removed The spark plug was placed inside the coil pack and grounded against the head and the engine was cranked. Spark was observed.
So we have spark, air, and fuel.... which means to me that either timing is somehow off or the DME isn’t being communicated with accurately.
Due to using an older OTS COBB map I asked Sam from By Design to send me a base map. The base map was uploaded to the car
We swapped the coil pack on cylinder 4 with one of my old coil packs and reset the CELs. The codes we got then got on the Durametric were for misfires in cylinder 4 and 6 (instead of 5), Random Cylinder Misfire
On the COBB the codes found were P0003 Fuel Volume Regulator Control Circuit Low, P0203 Injection Valve, Open Circuit, P0303 Misfire, Cylinder Selective.
The newer coilpack was put back on and the codes were cleared.
The engine was started and the misfires in cylinder 4 and 5 resumed.
The MAF on bank 2 was unhooked and the engine was started, with no change in results.
A datalog was taken and reviewed. It was found that the long and short term fuel trims were “locked” and not moving at all.
Sam advised me that the stock map may need to be put back on the ECU and then reupload the base map. I followed his guidance and the fuel trims were moving, but the car still having the same issues.
The 02 and Wideband sensors were swapped banks, with no change in results.
A leak down test in cylinder 4 and 5 was performed and 2-3% leak down was found.
The variocam solenoids and cam position sensors were swapped banks, with no change in results. (All 4 solenoids were bench tested and appeared to function normally)
A datalog was taken and the fuel trims were found to be locked again.
This is where we currently are at.
What are things I should be looking for and other things I may be able to check.
I believe that since these symptoms are only being shown on bank 2 across all cylinders that it must be something controlling that individual bank. Any guidance is appreciated.
When the engine was out I upgraded/replaced the following:
-clutch/flywheel
-GT2 Slave Mod
-SRM K24+ Turbos (non-VTG)
-Denso #3245 Spark Plugs
-ID1300s
-IPD 82mm Plenum and GT3 TB
-Pinned Camshafts
-Waterpump
-Intake Pipes
-HKS EVC
-Timing Chain Tensioners
-Coolant Elbows & Pinned pipes
-Any necessary o-rings
-Fuel Filter
The harness that lays on top of the engine was removed and reinstalled.
The engine was reinstalled into the vehicle and oil pressure was built before start up. The COBB OTS 1300 map was uploaded to the car. There was a loud metal noise that was heard but it was unsure the cause. Once pressure was built the engine was started and the metal noise was even louder and found to be coming from the bank 2 timing chain tensioner. The tensioner was removed and found to be installed upside down. The tensioner was installed correctly and the loud noise was no longer present. The engine was started but was found to die. Once all of the intercooler piping, y-pipe, etc was hooked up the car would start and idle.
HOWEVER, It seemed as if Bank 2 was not running. The exhaust manifold on Bank 1 was reaching appropriate operating temperature but the exhaust manifold on Bank 2 was probably only 90°.
There were CEL codes misfires in cylinder 4 and 5, and an additional code for random misfires
I then used the durametric and looked at my cam deviation assuming that was the issue. Bank 1 was -3° and Bank 2 was -3.02°.
The injector wiring on cylinder 4 and 5 were checked with the pins on the main circular harness and they were correct.
There was fuel found to be coming from a crack in the exhaust manifold so we know fuel was getting there. (The crack has been fixed)
The coil pack on cylinder 4 was pulled along with the spark plug. The spark plug was found to be damp. With the fuel pump fuse removed The spark plug was placed inside the coil pack and grounded against the head and the engine was cranked. Spark was observed.
So we have spark, air, and fuel.... which means to me that either timing is somehow off or the DME isn’t being communicated with accurately.
Due to using an older OTS COBB map I asked Sam from By Design to send me a base map. The base map was uploaded to the car
We swapped the coil pack on cylinder 4 with one of my old coil packs and reset the CELs. The codes we got then got on the Durametric were for misfires in cylinder 4 and 6 (instead of 5), Random Cylinder Misfire
On the COBB the codes found were P0003 Fuel Volume Regulator Control Circuit Low, P0203 Injection Valve, Open Circuit, P0303 Misfire, Cylinder Selective.
The newer coilpack was put back on and the codes were cleared.
The engine was started and the misfires in cylinder 4 and 5 resumed.
The MAF on bank 2 was unhooked and the engine was started, with no change in results.
A datalog was taken and reviewed. It was found that the long and short term fuel trims were “locked” and not moving at all.
Sam advised me that the stock map may need to be put back on the ECU and then reupload the base map. I followed his guidance and the fuel trims were moving, but the car still having the same issues.
The 02 and Wideband sensors were swapped banks, with no change in results.
A leak down test in cylinder 4 and 5 was performed and 2-3% leak down was found.
The variocam solenoids and cam position sensors were swapped banks, with no change in results. (All 4 solenoids were bench tested and appeared to function normally)
A datalog was taken and the fuel trims were found to be locked again.
This is where we currently are at.
What are things I should be looking for and other things I may be able to check.
I believe that since these symptoms are only being shown on bank 2 across all cylinders that it must be something controlling that individual bank. Any guidance is appreciated.
Registered User
Joined: Jul 2020
Posts: 28
Rep Power: 8
Couple things
you mentioned bank 2 across all cylinders but misfires were only on 4 and 5? Not 6? What happens when running and you disable cylinder 4 or 5 individually? Do you notice a change in rpm? I do not like your testing of fuel by observation of fuel in manifold. Have you tried swapping injectors bank to bank? ID are great injectors but still man made. I did t see it mentioned but did you replace all coil packs on that bank with older ones? Did it run ok before with old coil packs? Since you put in old coil pack and misfire seemed to move, to you try putting that coil pack on bank 1 to see if that followed? Triple check all grounds.
What is compression in each cylinder? Leak down is good but compression test could identify a potential timing chain issue although you error is good
you mentioned bank 2 across all cylinders but misfires were only on 4 and 5? Not 6? What happens when running and you disable cylinder 4 or 5 individually? Do you notice a change in rpm? I do not like your testing of fuel by observation of fuel in manifold. Have you tried swapping injectors bank to bank? ID are great injectors but still man made. I did t see it mentioned but did you replace all coil packs on that bank with older ones? Did it run ok before with old coil packs? Since you put in old coil pack and misfire seemed to move, to you try putting that coil pack on bank 1 to see if that followed? Triple check all grounds.
What is compression in each cylinder? Leak down is good but compression test could identify a potential timing chain issue although you error is good
Last edited by dbishop1113; Sep 29, 2020 at 07:05 AM.
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