mattbta
Full Access Member
I've run an ounce of TC-W3 per 5 gallons of fuel in my tank on many occasions to clean out the system and combustion. Lots of discussion around it on BITOG, but figured it hasn't hurt.
6.0L Fuel pump?
- Thread starter Matthew Jeschke
- Start date
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Nope, Genuine GM Injectors, 8 of them for $80.61 each part #17113698
The throttle body was also Genuine GM #12679525 and that particular throttle body is still available at RA for $154. I paid $145.
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Matthew Jeschke
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I have one bottle of seafoam in my tank. Bought a second one for the next tank.
Seems this may all be a false alarm. Not sure my laser temperature gun is all that accurate (Chinese crap). If I get the gun really close, and take temperature in same location on all cylinders then they are very close.
If I'm off by a bit, and get farther down on the manifold than the temperature is much hotter.
Seems this may all be a false alarm. Not sure my laser temperature gun is all that accurate (Chinese crap). If I get the gun really close, and take temperature in same location on all cylinders then they are very close.
If I'm off by a bit, and get farther down on the manifold than the temperature is much hotter.
I did my exhaust manifold temps today, from a cold start and after running for 5 minutes. Read the temp at exactly the same spots. All were within 20 degrees at around 220 to 240 degrees and that was just after the manifold flange at the start of the tubes. If I was off just a hair, it made a difference. I had a laser red light that pointed at what it was reading too. Been a long time since I just stood there and listened to the engine run. Maybe it was related to the new tune work from @BlackBearPerf but it was really really quiet.
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Matthew Jeschke
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Sounds like what I got for the six cylinders, they were around 230f... Second time I measured everything was just like you got. Not sure what normal is to be honest. I noticed I had to be very consisten with where I measured. Am going to monitor for a while.
Hadn't heard of putting a little two cycle oil in the gas every now and again. Prob does good to oil up injectors and pump?
Hadn't heard of putting a little two cycle oil in the gas every now and again. Prob does good to oil up injectors and pump?
To each their own but I am not gonna put oil in my fuel. Proven for me and that would be the Sea Foam or Techron.
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Matthew Jeschke
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I just ordered a fuel pressure tester; new crank position sensor (couldn't hurt mine is old). I still keep thinking maybe it's a bad injector. I found my order on ebay. They were SUPER cheap Delphi which maybe was bad / defective parts?
I need to lift up the fuel rail too and see if any of them leak once pressurized.
I need to lift up the fuel rail too and see if any of them leak once pressurized.
Donal
Full Access Member
did the description distingish Flex vs non flex?
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Matthew Jeschke
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They are exact same as the ones I pulled from my 5.3L. They aren't flex fuel, I believe they're the 24# injectors? I don't recall exactly what the spec is but direct replacement part.
I couldn't resuse the 5.3L ones as I broke one and didn't have a test bench to figure out which one it was. I know was cylinder 7 but being the idiot I am, I pulled them and threw them in a pile. I probably could figure it out now but threw them away.
Only difference is these new ones are Delphi. I have been very skeptical of Delphi parts. At time I had thought they were OEM manufacturer but they aren't anymore.
Somebody told me how to test the pressure regulator w/o a pressure gauge. He said to just unplug the vacuum line and see if fuel comes out when engine is idling. If it does the regulator is bad.
I also have a fuel pressure gauge in the mail. Maybe a week before it gets here though :/
Lastly, I have a guy that tunes trucks (my engine is a custom build LQ9). He's looking through the tune but don't believe this is a tunable thing.
I couldn't resuse the 5.3L ones as I broke one and didn't have a test bench to figure out which one it was. I know was cylinder 7 but being the idiot I am, I pulled them and threw them in a pile. I probably could figure it out now but threw them away.
Only difference is these new ones are Delphi. I have been very skeptical of Delphi parts. At time I had thought they were OEM manufacturer but they aren't anymore.
Somebody told me how to test the pressure regulator w/o a pressure gauge. He said to just unplug the vacuum line and see if fuel comes out when engine is idling. If it does the regulator is bad.
I also have a fuel pressure gauge in the mail. Maybe a week before it gets here though :/
Lastly, I have a guy that tunes trucks (my engine is a custom build LQ9). He's looking through the tune but don't believe this is a tunable thing.
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Matthew Jeschke
Full Access Member
Well, I got around to lifting the fuel rail. I lifted it up off the intake and looked for leaking injectors. I didn't have any drips, however, the bottom of every single injector was damp. I wiped them off, then depressurized the system and they were damp again.
I've never diagnosed injectors before.
I assume injector nozzles getting damp, when they are off might be my problem?
I also took intake off and swabbed behind throttle blade with my finger. It came out with damp soot and smelling of gas. This was after the truck had sat for two days w/o being started.
Lastly, I pulled the vacuum line on the pressure regulator and idled the engine. No gas cam out the vacuum port on the regulator. Somebody told me to do that to check the regulator. It passed the test.
I've never diagnosed injectors before.
I assume injector nozzles getting damp, when they are off might be my problem?
I also took intake off and swabbed behind throttle blade with my finger. It came out with damp soot and smelling of gas. This was after the truck had sat for two days w/o being started.
Lastly, I pulled the vacuum line on the pressure regulator and idled the engine. No gas cam out the vacuum port on the regulator. Somebody told me to do that to check the regulator. It passed the test.
