PrimerPLus
10+ Year Contributor
- 1,158
- 20
- Jul 28, 2011
-
Tokyo,
Asia
1). Any boost, vac, or exhaust leaks?
Tested to 35psi no leaks other than at the ISC electrical pins. See video. Video is not new but it does the same thing now.
2). Verified mechanical timing?
Yes all lines up.
3). Verified base timing?
2g
4). Ignition system
COP or Stock Coil: Stock
Wire brand and Age: NGK few months old.
Spark Plug brand, type and Gap: NKG BPR7ES gapped .025
5). Motor health (Compression Test)
Cylinder 1: 152
Cylinder 2: 150
Cylinder 3: 150
Cylinder 4: 153
6). Performed basic throttle body adjustments?
Idle Switch: Set via ECMlink
Throttle Cable: yes
TPS: .63 at idle
BISS: 2 full turns out from bottom
7). Compression ratio
8). Any known bad sensors or brittle wiring?
o2 sensor has same peeling of its heat shield but still seems to cycle fine via ECMLINK
9). Any DTC/CEL codes?
I do get a random missfire every now and then.
Otherwise known reasons.
10). Electrical system
Car off (not running):
Car running:
11). Base fuel pressure and injector values
Base Fuel Pressure:43psi
Injector Size (cc/min): FIC 1150cc
12). Properly calibrated and configured wideband sensor
Sensor Brand:AEM Uego
Calibration Date:
13). Type of fuel
Type: 90
14). Watched ECMlink how-to videos?
Yes
I can not get my ISC lower than 40.
When I ground timing to ecu, and ground diagnostic to ecu, the ISC will go to 9 and stay there.
I have done a BLT and don't think I have any but when I set the BISS to the IDLE I want which is 1100, and then unground those connectors the idle goes crazy. Up to 2k then cuts off and will just keep doing it.
If I screw the BISS all the way in I can get 1100 rpm idle no surge but I think the BISS is supposed to be about 2 full turns out from bottom.
I have no vac lines on the TB, they are capped off.
I just rebuilt the TB because it has shaft seals leak but now it is good.
I have a catch can so no stock PCV. Both of those ports, the one from intake manifold and the one on the valve cover are capped off.
My BoV is Tial, and I use an -4AN line and fitting from manifold to it.
my Hallman MBC also uses -4AN fittings, 1 to the boost source which is from intercooler piping, and the other is to the external wastegate.
Does it sound like I have a boost leak or something else?
Oh I use to have no problems but I recently had to do some changes including the TB rebuild, and also I changed my Catch Can from feeding back into turbo because I didn't like the residue going through intercooler and back into combustion. So it has a vented filter. So now my intercooler piping is clean no extra oil or vapors etc.
I took the TB off and checked it out. It seems to close fully.
I put everything back together and took a couple of logs.
I also tested the ISC coils and they all checked out. I also tested via the harness. I had a friend turn key on and I watched the ISC go in, turn key off and it goes back out.
First is idle as it is warming up. All is good no surge nothing.
The second is idle as it is at operating temps. Also good.
Third is a cruise to the store. When I get to the store it starts to show sings of high idle.
Last is when I am leaving the store. I noticed that my TPS was fluctuating from .63 to .65 so I tried to adjust it. Still doing it. I unchecked use TPS adjust to set the TPS to .63 as it was idling. But then it would not go to 100% throttle. SO I used the TPS adjust to correct that.
I checked to make sure the throttle cable was not holding the plate open which I am sure it wasn't but I loosed it up some anyways.
After doing that the last log is the results.
Tested to 35psi no leaks other than at the ISC electrical pins. See video. Video is not new but it does the same thing now.
You must be logged in to view this image or video.
2). Verified mechanical timing?
Yes all lines up.
3). Verified base timing?
2g
4). Ignition system
COP or Stock Coil: Stock
Wire brand and Age: NGK few months old.
Spark Plug brand, type and Gap: NKG BPR7ES gapped .025
5). Motor health (Compression Test)
Cylinder 1: 152
Cylinder 2: 150
Cylinder 3: 150
Cylinder 4: 153
6). Performed basic throttle body adjustments?
Idle Switch: Set via ECMlink
Throttle Cable: yes
TPS: .63 at idle
BISS: 2 full turns out from bottom
7). Compression ratio
8). Any known bad sensors or brittle wiring?
o2 sensor has same peeling of its heat shield but still seems to cycle fine via ECMLINK
9). Any DTC/CEL codes?
I do get a random missfire every now and then.
Otherwise known reasons.
10). Electrical system
Car off (not running):
Car running:
11). Base fuel pressure and injector values
Base Fuel Pressure:43psi
Injector Size (cc/min): FIC 1150cc
12). Properly calibrated and configured wideband sensor
Sensor Brand:AEM Uego
Calibration Date:
13). Type of fuel
Type: 90
14). Watched ECMlink how-to videos?
Yes
I can not get my ISC lower than 40.
When I ground timing to ecu, and ground diagnostic to ecu, the ISC will go to 9 and stay there.
I have done a BLT and don't think I have any but when I set the BISS to the IDLE I want which is 1100, and then unground those connectors the idle goes crazy. Up to 2k then cuts off and will just keep doing it.
If I screw the BISS all the way in I can get 1100 rpm idle no surge but I think the BISS is supposed to be about 2 full turns out from bottom.
I have no vac lines on the TB, they are capped off.
I just rebuilt the TB because it has shaft seals leak but now it is good.
I have a catch can so no stock PCV. Both of those ports, the one from intake manifold and the one on the valve cover are capped off.
My BoV is Tial, and I use an -4AN line and fitting from manifold to it.
my Hallman MBC also uses -4AN fittings, 1 to the boost source which is from intercooler piping, and the other is to the external wastegate.
Does it sound like I have a boost leak or something else?
Oh I use to have no problems but I recently had to do some changes including the TB rebuild, and also I changed my Catch Can from feeding back into turbo because I didn't like the residue going through intercooler and back into combustion. So it has a vented filter. So now my intercooler piping is clean no extra oil or vapors etc.
I took the TB off and checked it out. It seems to close fully.
I put everything back together and took a couple of logs.
I also tested the ISC coils and they all checked out. I also tested via the harness. I had a friend turn key on and I watched the ISC go in, turn key off and it goes back out.
You must be logged in to view this image or video.
First is idle as it is warming up. All is good no surge nothing.
The second is idle as it is at operating temps. Also good.
Third is a cruise to the store. When I get to the store it starts to show sings of high idle.
Last is when I am leaving the store. I noticed that my TPS was fluctuating from .63 to .65 so I tried to adjust it. Still doing it. I unchecked use TPS adjust to set the TPS to .63 as it was idling. But then it would not go to 100% throttle. SO I used the TPS adjust to correct that.
I checked to make sure the throttle cable was not holding the plate open which I am sure it wasn't but I loosed it up some anyways.
After doing that the last log is the results.
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