Fuel Injector Cleaning on SC430
#16
That wouldn't cover all four of his cars. It also doesn't get his intake valves cleaned. True taking them out getting them cleaned and flow tested is the best option. This this cleans as well just no test for wear.
#19
Lexus Test Driver
Thread Starter
Funny you ask! I picked up some connectors and did my first fuel injector cleaning today. My 2000 5.7L Trans Am was the first victim ;-). I did it first because GM made it very easy, the fuel rail has a schrader valve and the fuel pump relay is right there next to the radiator. All of this means, no tools required. Our SCs are a different story and more to follow on that.
Anyway, I filled the container with cleaner, connected my air compressor to the tool, adjusted the pressure 5psi below the normal fuel rail pressure and started the car. It ran for about 10-15min, then stopped running when it ran out of cleaner.
BTW, I did not see any smoke coming out of the exhaust.
I then disconnected everything, installed the relay and it fired right up...the engine idled smoother and then I took her for I ride, my butt dyno detected a 10hp gain! ;-)
Anyway, I filled the container with cleaner, connected my air compressor to the tool, adjusted the pressure 5psi below the normal fuel rail pressure and started the car. It ran for about 10-15min, then stopped running when it ran out of cleaner.
BTW, I did not see any smoke coming out of the exhaust.
I then disconnected everything, installed the relay and it fired right up...the engine idled smoother and then I took her for I ride, my butt dyno detected a 10hp gain! ;-)
Last edited by Bgw70; 01-22-16 at 01:45 AM.
#22
Lexus Test Driver
Thread Starter
I was going to clean the injectors in the SC today but could not loosen the fuel line, which is located on the drivers side near plugs 2 and 3. It is ridged fuel line then it becomes flexible line.
I was using line wrenches but they are cheap. I need to pickup better quality wrenches before I try again.
I was using line wrenches but they are cheap. I need to pickup better quality wrenches before I try again.
#23
Lead Lap
Pretty cool Bgw. It is always nice to experience immediate (and good) results!
#24
Lexus Test Driver
Thread Starter
My son picked up some new flare (line) wrenches today and I was able to break the fuel line open easily, but decided to wait for another day because it was late and we were watching the playoffs!
The DIY will be up soon for those that are interested.
The DIY will be up soon for those that are interested.
#25
Lexus Test Driver
Thread Starter
I finally cleaned the SC430 fuel injectors!
The process was easy and it took about 45 minutes.
Here are some pictures doing the job.
NOTE: see post no.27 to disable the fuel pump by pulling a relay instead of removing the rear seat.
Remove the rear seat and remove the three plastic nuts holding the fuel pump access cover in place.
Remove the fuel pump electrical connector.
I started the car to relieve the fuel pressure from the fuel line, then opened the fuel line using a 14mm and 19mm line wrenches.
Fuel line is now open.
A tee was placed on the engine side of the fuel line. I also added another pressure gauge to compare both gauges.
This is the OTC 7448A fuel injector cleaning device. It too has a pressure gauge.
The manual said the fuel pressure should be 38psi on the line going in the engine.
I ran it at 32 psi and the engine ran fine.
At this point the engine is running on the fuel injector cleaner.
I increased the pressure to 34 psi toward the end of the service.
And look at that, 31.6 MPG<br/> JK!
The process was easy and it took about 45 minutes.
Here are some pictures doing the job.
NOTE: see post no.27 to disable the fuel pump by pulling a relay instead of removing the rear seat.
Remove the rear seat and remove the three plastic nuts holding the fuel pump access cover in place.
Remove the fuel pump electrical connector.
I started the car to relieve the fuel pressure from the fuel line, then opened the fuel line using a 14mm and 19mm line wrenches.
Fuel line is now open.
A tee was placed on the engine side of the fuel line. I also added another pressure gauge to compare both gauges.
This is the OTC 7448A fuel injector cleaning device. It too has a pressure gauge.
The manual said the fuel pressure should be 38psi on the line going in the engine.
I ran it at 32 psi and the engine ran fine.
At this point the engine is running on the fuel injector cleaner.
I increased the pressure to 34 psi toward the end of the service.
And look at that, 31.6 MPG<br/> JK!
Last edited by Bgw70; 01-26-16 at 02:00 AM.
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f14tomcat (01-15-22)
#27
Lexus Test Driver
Thread Starter
I read the instructions that came with the OTC equipment and although they were correct instructing me to disconnect the connector on the fuel pump, you are also correct.
It seems there is a fuel pump relay but that does not kill the fuel pump because there is a resistor Parallel to the relay (see schematic, left side, blue wire connecting the two relays). The fuel pump is located at the lower left side of the schematic.
The relay you want to pull is called the CIR OPN Relay. I just confirmed what I am writing by pulling each relay one at a time. When I pulled the CIR OPN Relay, the engine ran out of gas but when I pulled the F/PMP Relay the engine kept running.
NOTE: the F/PMP relay is shown in the normally closed position and power must be applied to it to open this relay. The command comes from the ECU.
Relay box location, Engine Room No.2
Remove CIR OPN Relay
My middle finger is on CIR OPN Relay
Last edited by Bgw70; 01-26-16 at 02:02 AM.
#29
Lexus Test Driver
Thread Starter
Ok this is how I see it. First I do use Berryman' fuel cleaner in my cars. The cleaners only work to a certain degree. Kind of like a dishwasher. It has it's limitations. Some things you just have to wash off with more power. In this case it's hand scrubbing. I see fuel treatment in this fashion. They help clean but have limitations. Using a system like Bgw bought. It runs straight cleaner for about 15-20 minutes. This is like running the parts through a heated parts washer using full strength cleaner. This is going to be more like hand pre washing the dishes before going into the dishwasher. Your clean off the tuff stuck on stuff that normally wasn't get washed off.
Is this the product you are using?
#30
Cole,
Is this the product you are using?
Amazon.com: Berryman 1120 B-12 Chemtool Thru-Rail Fuel Injector Cleaner - 12 oz.: Automotive
Is this the product you are using?
Amazon.com: Berryman 1120 B-12 Chemtool Thru-Rail Fuel Injector Cleaner - 12 oz.: Automotive