DSM_15_2G
5+ Year Contributor
- 39
- 17
- Dec 6, 2018
-
Serbia,
Europe
Hi guys,
I am posting here because I think It's related to the engine management side...
I have 2 problems at the moment.
1. The car is running really rich
2. I have a high idle
Let me introduce the story behind the problems so maybe someone can help me out. Anyways, my car started out as a European GS 1999 Year with an NA 4g63. Had the car for 3 years now, and few weeks ago I turboed the car with the stock GST/GSX parts.
When I bought the car, it had an open air filter and a 3 inch catback exhaust with the catalytic converer on it. The car had great MPG. Some time later I decided to remove the catalytic converter and as a result, the car started to smoke, smell of gas and I had terrible MPG, spent 60$ on 25miles. Worried, went back to the shop and rewelded the cat back on, and the problems went away.
Took the car to the shop to do the maintenance : All the belts, fluids, filters, brakes, suspension, valve stem seals, oil leaks, etc. I gave them the stock exhaust to replace the catback, because the drone and the noise on the highways was killing me. (NA cars are much louder)..
Got the car from the shop, pulled great but they've told me they left out the cat, so they installed the stock exhaust but instead of the cat, they installed a pipe. I was a bit worried that the MPG issue might arrise.
I could smell the gasoline but the MPG wasn't bad but it wasn't like before.
Drove the car as is for some time before I started replacing stuff on it. Replaced spark plug wires, coil pack, power transistor unit, front O2 sensor, fuel pressure regulator, spark plugs, maf, water temp sensor, mishimoto rad and more but I can't think of it right now. All the parts were new OEM.
Nothing changed. So I decided to go to the exhaust shop and weld the cat back on, maybe that will solve the issue? Nope, on the exhaust it felt the car was choking and the MPG went drastically down. Again I went to the shop and put the pipe back on.
Drove the car ever since then as is. Then all of a sudden, my car would crank for 5-6 seconds after youd drive it for a while and let it sit for more than 10 seconds.
Tried to find the solution until I realised the cyl 4 spark plug was 100% black and smelling of gas (btw, my oil smelled of gas as well) and I think I've had a leaking 4 cyl injector.
At this point, I already gathered turbo parts and all maintenance new oem gaskets, and parts.
I took off everything except the engine. Installed all the new gaskets (intake manifold, TB, Exhaust mani (golden 4ply oem), all the turbo gaskets etc.), rebuilt the used (new for me) TB my buddy sent me from the US, new oem thermostat and radiator cap, new oem pcv valve, new oem everything basically and literally
I thought since Im changing everything, I'll do it right and never look back. Oh and on the turbo swap I've used the 95 gsx eprom ECU.
As I finished everything, went to fire up the car and saw that I need to change the wire order since my car is 99 (cam sensor) and the ecu is 95.
After that the car fired right up and idled at 2k rpm.
Slapped a 2.8 inch full exhaust, from the o2 housing all the way to the end. Instead of cat it has a muffler to look like a cat for inspections and to reduce noise.
Also used Injen Intake pipe and a gtr r34 bov with adaptor. Everything else was stock.
The car would idle at 1.8k rpm cold and when hot it would drop to 1.3k and hold it steady there.
Replaced FIAV from my old gs TB to the GST one and used new FIAV gasket. After that, the car idled great.
Note. All of this time since the car is turbo, it pulled great ( boost leak tested it, no leaks), but it still smelled of gas like crazy (I removed egr and evap canister, left the solenoids plugged in). My mpg was like before (fine but not great).
Then one day, I used the car as always, then I went to start it and go home, as it was cranking I would hear a pop sound and it would crank for a second longer but as soon as it fired up it ran to 2000 rpm idling. Drove it as is home and let it sit. The day after I disconnected the battery, inspected the hoses and everything seemed fine. I brought my old TB with its TPS and started the car up, but plugging the OLD tps on. The car idled at 2k rpm still but then dipped to 900 and I just plugged my TPS back and it ran fine again (still smelling of gas as always).
So yesterday,after a few days from the idle issue, bought Bosch O2 sensors (both front and rear) went to replace them. Since the turbo swap was done the car would idle for some time and get a CEL but the car rides fine. Thought it was the rear o2 sensing the cat is gone. So I bought those extensions. And while installing the extension on the rear o2 I replaced the front one in the o2 housing.
Drove the car home, the CEL popped up again and I was like ah f*** it...
That same night, went to start the car and it popped while cranking and the car again started idling at 2k rpm.
The next day (today) tried unplugging the battery and the tps thing, but it doesent change the idle.
Tried unplugging the maf, it drops it to 1700, then unplugging tps it drops it to 900 rpm but the car runs rough as if it will die. Unplugging the iac motor doesent change anything. I tested resistance on it and it tested 32 ohms on all pins.
I also pulled the plugs to inspect them and to my surprise they were all black and smelling of gas
Note; the car idles at 2k rpm even when cold and hot
Im at a loss right now. Basically replaced everything on the car and its still giving me nuts
I know you guys will tell me to first get the code, (I still think its either the rear o2 or the emissions things). and get a data logger but I spent way too much money on the car so far, and Im in europe so even if I ordered Wideband or ECM link, it will take at least a month to arrive.
Can anyone suggest me anything?
Ill leave two photos bellow of how the car looked before and how it looks now.
(Btw, my knock sensor leaked out, I bought the oem evo8 one and will replace it when I cut my 27mm socket, because I cant get to it any other way)
Im waiting on the black sillicone hose for the bov, yes I know its short and ugly
I am posting here because I think It's related to the engine management side...
I have 2 problems at the moment.
1. The car is running really rich
2. I have a high idle
Let me introduce the story behind the problems so maybe someone can help me out. Anyways, my car started out as a European GS 1999 Year with an NA 4g63. Had the car for 3 years now, and few weeks ago I turboed the car with the stock GST/GSX parts.
When I bought the car, it had an open air filter and a 3 inch catback exhaust with the catalytic converer on it. The car had great MPG. Some time later I decided to remove the catalytic converter and as a result, the car started to smoke, smell of gas and I had terrible MPG, spent 60$ on 25miles. Worried, went back to the shop and rewelded the cat back on, and the problems went away.
Took the car to the shop to do the maintenance : All the belts, fluids, filters, brakes, suspension, valve stem seals, oil leaks, etc. I gave them the stock exhaust to replace the catback, because the drone and the noise on the highways was killing me. (NA cars are much louder)..
Got the car from the shop, pulled great but they've told me they left out the cat, so they installed the stock exhaust but instead of the cat, they installed a pipe. I was a bit worried that the MPG issue might arrise.
I could smell the gasoline but the MPG wasn't bad but it wasn't like before.
Drove the car as is for some time before I started replacing stuff on it. Replaced spark plug wires, coil pack, power transistor unit, front O2 sensor, fuel pressure regulator, spark plugs, maf, water temp sensor, mishimoto rad and more but I can't think of it right now. All the parts were new OEM.
Nothing changed. So I decided to go to the exhaust shop and weld the cat back on, maybe that will solve the issue? Nope, on the exhaust it felt the car was choking and the MPG went drastically down. Again I went to the shop and put the pipe back on.
Drove the car ever since then as is. Then all of a sudden, my car would crank for 5-6 seconds after youd drive it for a while and let it sit for more than 10 seconds.
Tried to find the solution until I realised the cyl 4 spark plug was 100% black and smelling of gas (btw, my oil smelled of gas as well) and I think I've had a leaking 4 cyl injector.
At this point, I already gathered turbo parts and all maintenance new oem gaskets, and parts.
I took off everything except the engine. Installed all the new gaskets (intake manifold, TB, Exhaust mani (golden 4ply oem), all the turbo gaskets etc.), rebuilt the used (new for me) TB my buddy sent me from the US, new oem thermostat and radiator cap, new oem pcv valve, new oem everything basically and literally
I thought since Im changing everything, I'll do it right and never look back. Oh and on the turbo swap I've used the 95 gsx eprom ECU.
As I finished everything, went to fire up the car and saw that I need to change the wire order since my car is 99 (cam sensor) and the ecu is 95.
After that the car fired right up and idled at 2k rpm.
Slapped a 2.8 inch full exhaust, from the o2 housing all the way to the end. Instead of cat it has a muffler to look like a cat for inspections and to reduce noise.
Also used Injen Intake pipe and a gtr r34 bov with adaptor. Everything else was stock.
The car would idle at 1.8k rpm cold and when hot it would drop to 1.3k and hold it steady there.
Replaced FIAV from my old gs TB to the GST one and used new FIAV gasket. After that, the car idled great.
Note. All of this time since the car is turbo, it pulled great ( boost leak tested it, no leaks), but it still smelled of gas like crazy (I removed egr and evap canister, left the solenoids plugged in). My mpg was like before (fine but not great).
Then one day, I used the car as always, then I went to start it and go home, as it was cranking I would hear a pop sound and it would crank for a second longer but as soon as it fired up it ran to 2000 rpm idling. Drove it as is home and let it sit. The day after I disconnected the battery, inspected the hoses and everything seemed fine. I brought my old TB with its TPS and started the car up, but plugging the OLD tps on. The car idled at 2k rpm still but then dipped to 900 and I just plugged my TPS back and it ran fine again (still smelling of gas as always).
So yesterday,after a few days from the idle issue, bought Bosch O2 sensors (both front and rear) went to replace them. Since the turbo swap was done the car would idle for some time and get a CEL but the car rides fine. Thought it was the rear o2 sensing the cat is gone. So I bought those extensions. And while installing the extension on the rear o2 I replaced the front one in the o2 housing.
Drove the car home, the CEL popped up again and I was like ah f*** it...
That same night, went to start the car and it popped while cranking and the car again started idling at 2k rpm.
The next day (today) tried unplugging the battery and the tps thing, but it doesent change the idle.
Tried unplugging the maf, it drops it to 1700, then unplugging tps it drops it to 900 rpm but the car runs rough as if it will die. Unplugging the iac motor doesent change anything. I tested resistance on it and it tested 32 ohms on all pins.
I also pulled the plugs to inspect them and to my surprise they were all black and smelling of gas
Note; the car idles at 2k rpm even when cold and hot
Im at a loss right now. Basically replaced everything on the car and its still giving me nuts
I know you guys will tell me to first get the code, (I still think its either the rear o2 or the emissions things). and get a data logger but I spent way too much money on the car so far, and Im in europe so even if I ordered Wideband or ECM link, it will take at least a month to arrive.
Can anyone suggest me anything?
Ill leave two photos bellow of how the car looked before and how it looks now.
(Btw, my knock sensor leaked out, I bought the oem evo8 one and will replace it when I cut my 27mm socket, because I cant get to it any other way)
Im waiting on the black sillicone hose for the bov, yes I know its short and ugly
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