Over fueling or Injectors or Something else
Posted: Thu Oct 15, 2015 7:03 pm
Hi Guys
I recently bought a 200sx S13, this is my first Nissan and first turbo car.
There are a few minor mods to it, unfortunately I don't know what was done to it or how it was done and the previous owner bought it like it is now
Everything seems to be fine, I just have one problem, the car is overfueling. I know this because the exhaust gas smells of petrol and the oil in the motor smell of petrol. When the motor reach optimal working temp, it idles uneven, sometimes almost stalling.
I have been through this forum, some others and the google machine.
I have learned a few things but just cant seem to figure out some things, I really hope you guys can point me in the right direction.
What I know about the car.
The motor is stock
There is a different / bigger turbo. It runs 0.8 boost, is that stock?
Front Mount intercooler
There is a piggyback chip fitted by Dynoteck
There is a bigger exhaust fitted
Things that cause overfueling (according to what I think I have learned)
1. ECU / chip / Mapping
2. Airflow meter
3. Injectors
4. Boost leaks
5. Coils
6. Fuel pressure
7. Coolant temp sensor
8. Ignition timing
ps, the above list is not in any particular order
What I have done up to now
1. ECU/Chip/Mapping. I have made a booking for the car to go to Dynotech so that they can have a look at the chip and map to see if that is the problem. Its only going in on the 22nd
2. Airflow meter. I replaced the cone filter with a new one, I clean the AFM with cleaner
3. Injectors, I haven't touch that yet, I did notice that there are fuel on the manifold, so they will have to come out at some point.
4. Boost leaks, did not touch that yet
5. Coils, did not touch that yet
6. Fuel Pressure, did not touch that yet, finding a gauge seems to be a mission
7. Coolant temp sensor, did not touch that yet
8. Ignition Timing, did not touch that yet
Below is a link to a video I made
https://youtu.be/NcoJxgnSG2o
There is a sensor in the exhaust system. Did these cars come out with this, or is this only for the after market gauge?
After I cleaned the AFM the gauge went to lean and later to optimal. I drove home from work, and when I left again it went all the way to rich again. Drove about 20km and could allready smell the petrol in the oil (I did an oil change when I cleaned th AFM)
The one heater pipe was leaking, I replaced that today, and when I started it up afterwards to test for leaks, the air fuel ratio gauge stayed on lean and the eaxhust gas didnt smell of gas I waited till it was at optimal temp and it idle fine
I am super confused now.
Any thoughts would be greatly appreciated!!!
Please note, I am no mechanic, but love to fiddle, so please dont get to technical and pics is always awesome!!!
I recently bought a 200sx S13, this is my first Nissan and first turbo car.
There are a few minor mods to it, unfortunately I don't know what was done to it or how it was done and the previous owner bought it like it is now
Everything seems to be fine, I just have one problem, the car is overfueling. I know this because the exhaust gas smells of petrol and the oil in the motor smell of petrol. When the motor reach optimal working temp, it idles uneven, sometimes almost stalling.
I have been through this forum, some others and the google machine.
I have learned a few things but just cant seem to figure out some things, I really hope you guys can point me in the right direction.
What I know about the car.
The motor is stock
There is a different / bigger turbo. It runs 0.8 boost, is that stock?
Front Mount intercooler
There is a piggyback chip fitted by Dynoteck
There is a bigger exhaust fitted
Things that cause overfueling (according to what I think I have learned)
1. ECU / chip / Mapping
2. Airflow meter
3. Injectors
4. Boost leaks
5. Coils
6. Fuel pressure
7. Coolant temp sensor
8. Ignition timing
ps, the above list is not in any particular order
What I have done up to now
1. ECU/Chip/Mapping. I have made a booking for the car to go to Dynotech so that they can have a look at the chip and map to see if that is the problem. Its only going in on the 22nd
2. Airflow meter. I replaced the cone filter with a new one, I clean the AFM with cleaner
3. Injectors, I haven't touch that yet, I did notice that there are fuel on the manifold, so they will have to come out at some point.
4. Boost leaks, did not touch that yet
5. Coils, did not touch that yet
6. Fuel Pressure, did not touch that yet, finding a gauge seems to be a mission
7. Coolant temp sensor, did not touch that yet
8. Ignition Timing, did not touch that yet
Below is a link to a video I made
https://youtu.be/NcoJxgnSG2o
There is a sensor in the exhaust system. Did these cars come out with this, or is this only for the after market gauge?
After I cleaned the AFM the gauge went to lean and later to optimal. I drove home from work, and when I left again it went all the way to rich again. Drove about 20km and could allready smell the petrol in the oil (I did an oil change when I cleaned th AFM)
The one heater pipe was leaking, I replaced that today, and when I started it up afterwards to test for leaks, the air fuel ratio gauge stayed on lean and the eaxhust gas didnt smell of gas I waited till it was at optimal temp and it idle fine
I am super confused now.
Any thoughts would be greatly appreciated!!!
Please note, I am no mechanic, but love to fiddle, so please dont get to technical and pics is always awesome!!!