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what’s up guys I have a 1992 5 speed sc300 and I just finished my gte Ecu mod today and it’s running really rough. I don’t have the turbo Install yet doing it tomorrow, but as of rn the idle bounces up and down and drives rough. Is that bc a lack of the turbo? I’ve seen other people’s gte mod run decent na and I’m wondering if I went wrong some where. If anyone who’s done this can help me out.
That is your problem, those three ports don't have vacuum all the time.
You will need to tee your MAP sensor between the fuel pressure regulator and the intake manifold.
That is your problem, those three ports don't have vacuum all the time.
You will need to tee your MAP sensor between the fuel pressure regulator and the intake manifold.
alright thanks for the feed back. So basically somewhere on the runner area would be better?
I've found three spots that work well for the MAP Sensor, they are all circled in the attached image.
1) Port on the back of the intake manifold, close to the firewall;
2) Between Fuel Pressure regulator and intake manifold;
3) Port on front of intake manifold that goes to the power steering pump.
The three ports on the top of the throttle body does not have vacuum all the time, so that is why you are getting a rough running car. The MAP sensor is only getting input at sporadic moments.
I've found three spots that work well for the MAP Sensor, they are all circled in the attached image.
1) Port on the back of the intake manifold, close to the firewall;
2) Between Fuel Pressure regulator and intake manifold;
3) Port on front of intake manifold that goes to the power steering pump.
The port on the top of the throttle body does not have vacuum all the time, so that is why you are getting a rough running car. The MAP sensor is only getting input at sporadic moments.
ok I moved it over and started it it idles a little better. Not as up and down bogging. Doesn’t rev right and a lot of black smoke I’m assuming is fuel.
ok I moved it over and started it it idles a little better. Not as up and down bogging. Doesn’t rev right and a lot of black smoke I’m assuming is fuel.
ok I moved it over and started it it idles a little better. Not as up and down bogging. Doesn’t rev right and a lot of black smoke I’m assuming is fuel.
Yeah, let it run for a while. What size injectors did you use?
The first run with the new injectors and new ECU will be rough until the ECU learns your engine. Are you running a heated O2 sensor?
Yeah, let it run for a while. What size injectors did you use?
The first run with the new injectors and new ECU will be rough until the ECU learns your engine. Are you running a heated O2 sensor?
yes I believe I have a heated o2 I have a Cali spec with a 4 wire o2 under the car. I’m running 440cc injectors
Yes, I did have issues. Please post a list of the parts that you used when doing your swap.
Also, while the engine is running, move the harness that plugs into your ECU around slightly to see if your idle changes. For me, I had my MAP sensor plumbed incorrectly and the ECU pin connections were not secure. I moved the MAP vacuum line and soldered my ECU connections and that fixed my issues.
Black smoke is normally unburned gas. Did you replace your plugs? Are you sure all your coil packs and plug wires are connected in the correct order?
You could also have a vacuum leak somewhere in your system.
Yes, I did have issues. Please post a list of the parts that you used when doing your swap.
Also, while the engine is running, move the harness that plugs into your ECU around slightly to see if your idle changes. For me, I had my MAP sensor plumbed incorrectly and the ECU pin connections were not secure. I moved the MAP vacuum line and soldered my ECU connections and that fixed my issues.
Black smoke is normally unburned gas. Did you replace your plugs? Are you sure all your coil packs and plug wires are connected in the correct order?
You could also have a vacuum leak somewhere in your system.
is300 one rep coil packs
ngk plugs and wires
ds62 igniter
oem rep Supra map sensor
gm iat
440cc injectors
ill check the vaccum lines i deteled most of them.
yea I think I have the coils right coil 1 going to 6 coil 2 going to 5 and coil 3 going to 3
ill check the harness as well
also I’ll check the map wiring i switched it around bc the way I had it first it wouldn’t start and flipped it and it started.
05-28-18, 09:27 PM
Gte Ecu mod running rough
