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Post Options Post Options   Thanks (0) Thanks(0)   Quote DHMcFadin Quote  Post ReplyReply Direct Link To This Post Posted: August-15-2019 at 10:32pm
Here you go:
https://www.mniboats.com/PCM-Fuel-Injector-6-0L-8NH-p/ra087009.htm

New OEM Fuel Injector Set of (8) For Chevrolet and GMC V8-6.0L https://www.amazon.com/dp/B019EHCV38/ref=cm_sw_r_cp_api_i_vOFvDbTR2ZG40

https://www.summitracing.com/search/part-type/fuel-injectors/make/chevrolet/engine-size/6-0l-364

Lots of options. Might be worth your time to replace all 8.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote poecs13 Quote  Post ReplyReply Direct Link To This Post Posted: August-15-2019 at 10:41pm
This is the PCM one that my boat needs.

What I'm looking for is an automotive equivalent from ACDelco or the like for cheaper than PCM's $200 a piece.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Gary S Quote  Post ReplyReply Direct Link To This Post Posted: August-15-2019 at 10:45pm
Originally posted by JoeinNY JoeinNY wrote:

    Often times there are aftermarket alternatives that are cheaper than the automotive oem. Certainly don't pay PCM prices but get you some new crispy crisp injectulators.


Like Joe says there has to be other alternatives. Here for example are ones for Fords-
200 dollar each PCM injector

215 dollar set of 8 Ford motorsport injectors

Just need to find the spec's of your GM injectors,PCM for sure did not make them
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Gary S Quote  Post ReplyReply Direct Link To This Post Posted: August-15-2019 at 10:54pm
Originally posted by poecs13 poecs13 wrote:

From the shop that worked the injectors today:
"One of them was stuck wide open. The first set of four took four cleanings before they flowed correctly. The second set took three cleanings to flow correctly. They all seem to be flowing within two to three cc's of each other.


Your injector shop should be able to advise you on their size and alternatives
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Post Options Post Options   Thanks (0) Thanks(0)   Quote poecs13 Quote  Post ReplyReply Direct Link To This Post Posted: August-15-2019 at 11:10pm
A set of 8 for $50

Only ones I've found so far with four holes in the bottom. At that price point should I be at all concerned with the quality of the part or just go for it?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote poecs13 Quote  Post ReplyReply Direct Link To This Post Posted: August-15-2019 at 11:11pm
I figured the injector shop would be able to give a recommendation, but I said the word "marine" and their eyes glazed over.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DHMcFadin Quote  Post ReplyReply Direct Link To This Post Posted: August-15-2019 at 11:13pm
Originally posted by poecs13 poecs13 wrote:

I figured the injector shop would be able to give a recommendation, but I said the word "marine" and their eyes glazed over.


Marine doesn’t matter. Is a standard GM 6.0 injector.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote poecs13 Quote  Post ReplyReply Direct Link To This Post Posted: August-15-2019 at 11:44pm
Right, but apparently they come in a two or four hole variety, does that make a difference? The engine currently has the four hole version.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Gary S Quote  Post ReplyReply Direct Link To This Post Posted: August-15-2019 at 11:56pm
Originally posted by poecs13 poecs13 wrote:

At that price point should I be at all concerned with the quality of the part or just go for it?


With what you just spent on the engine rebuild don't now get cheap on the injectors. I know nothing about GM's other than to put my key in my truck and go but I would find a name brand injector,those seem awful cheap.
You know it can go horribly wrong the other way too- here is a melted piston from a GT40 that ran lean on #8

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Gary S Quote  Post ReplyReply Direct Link To This Post Posted: August-16-2019 at 12:08am
Originally posted by poecs13 poecs13 wrote:

Right, but apparently they come in a two or four hole variety, does that make a difference? The engine currently has the four hole version.


Does on a Ford,the high hp ones have the 4 hole. Just to be safe I would not change
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DHMcFadin Quote  Post ReplyReply Direct Link To This Post Posted: August-16-2019 at 12:09am
Grab a set of either GM label or Delphi injectors. Can be found easily online. Get a set of 8 so they all match.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DHMcFadin Quote  Post ReplyReply Direct Link To This Post Posted: August-16-2019 at 12:17am
Grab a set of either GM label or Delphi injectors. Can be found easily online. Get a set of 8 so they all match.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote gun-driver Quote  Post ReplyReply Direct Link To This Post Posted: August-16-2019 at 9:50am
Originally posted by Gary S Gary S wrote:

With what you just spent on the engine rebuild don't now get cheap on the injectors. I know nothing about GM's other than to put my key in my truck and go but I would find a name brand injector,those seem awful cheap.
You know it can go horribly wrong the other way too- here is a melted piston from a GT40 that ran lean on #8



Come on Gary a little emery cloth some pig mat n polish and slap it back in the hole.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Gary S Quote  Post ReplyReply Direct Link To This Post Posted: August-16-2019 at 4:40pm
I’m gonna use some JB Weld there Paul- it’s got weld right them there in its name
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Post Options Post Options   Thanks (0) Thanks(0)   Quote poecs13 Quote  Post ReplyReply Direct Link To This Post Posted: August-17-2019 at 4:47am
Okay...the “PCM” (Delphi) one arrived from Miami Nautique and it has...you guessed it...TWO holes.

So now what? I’m thinking all eight should match? Were the original injectors 2 hole and someone switched them to 4 at some point? Sufficiently confused at this point. Am I making a mountain out of a mole hill with the number of holes?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Treybizttu Quote  Post ReplyReply Direct Link To This Post Posted: August-17-2019 at 6:21pm
I would want them to match. I still doubt the number of holes needs to match as long as the volume/pressure matches...
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Post Options Post Options   Thanks (0) Thanks(0)   Quote KENO Quote  Post ReplyReply Direct Link To This Post Posted: April-21-2020 at 11:49am
Poecs13

Since you've been logged on a few times lately, is there a happy ending to this story?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote poecs13 Quote  Post ReplyReply Direct Link To This Post Posted: May-04-2020 at 10:32am
Ken,

Thanks for checking in, I've been meaning to get back on here to write an update. This was the kick I needed.

I wish I had better news, but I'm still dealing with the same hot start issue that I chronicled here before the hydrolock and engine rebuild. Hard to believe that it's been almost two years and I still haven't solved the problem...

It takes one crank to start the engine cold, no problem. After the engine is warm, if it sits for more than ten minutes after shut off, it is flooded and I have open the throttle wide open to clear it to restart.

On the post referenced above, Jody suggested replacing the air temp sensor in the flame arrestor, but all I have near my flame arrestor sensor-wise is a Throttle Position Sensor and an Idle Air Control Valve. Unless one of them also has a temperature sensor?

I am open to any and all suggestions on this one. My wife is ready to trade the boat in. She doesn't want to go another summer with a non-functioning boat and is (rightfully) fearful of repeating the hydrolock episode from last spring if we continue to run as is.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote KENO Quote  Post ReplyReply Direct Link To This Post Posted: May-04-2020 at 6:14pm
I think you don't have an IAT sensor

The link below is to a PCM manual that covers more than one engine but your 6.0 is one of them.

It's a 337 page download and if you go to page section 2 you'll find lots of sensor info and the 6.0 doesn't seem to have one. The 5.7 for example has a combined MAP/IAT sensor but in a couple of places it says your 6.0 doesn't. and doesn't have an input to the computer unless the functions are combined and they don't talk about it.

All kinds of good GM fuel injection info in the manual

link
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Post Options Post Options   Thanks (0) Thanks(0)   Quote poecs13 Quote  Post ReplyReply Direct Link To This Post Posted: May-04-2020 at 6:55pm
Ken,

Thanks for the manual! I hadn't come across that one yet, but it is super helpful.

However, the manual states that the combo MAP/IAT sensor only exists on the 5.0/5.7 motors. On the 6.0, it's only a MAP sensor. Is the MAP sensor still the potential culprit in this case?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote KENO Quote  Post ReplyReply Direct Link To This Post Posted: May-04-2020 at 8:30pm
Originally posted by poecs13 poecs13 wrote:

Ken,

Thanks for the manual! I hadn't come across that one yet, but it is super helpful.

However, the manual states that the combo MAP/IAT sensor only exists on the 5.0/5.7 motors. On the 6.0, it's only a MAP sensor. Is the MAP sensor still the potential culprit in this case?


Well at least we agree on the way we read the manual

The first link below is the parts manual and that lists no IAT sensor either.

The second link is to a PCM MAP sensor for your engine. With a little shopping you can find a generic replacement for half the price if you're so inclined.

It could be a cause of the issue but without the diagnostic tools it's kinda a crap shoot

link

link
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Post Options Post Options   Thanks (0) Thanks(0)   Quote MrMcD Quote  Post ReplyReply Direct Link To This Post Posted: May-04-2020 at 9:08pm
Sounds to me like the injector issue was never fixed. 4 hole or 2 hole does not matter but what does matter is the gallons per hour flow and a quality build.
Many GM drivers tune for more horsepower with the LS engine blocks.   A common upgrade is to replace standard injectors with new injectors that have a higher gallon per hour flow rate to keep up with the other performance mods they make.
The only source for fuel in the intake is your injectors, if you are flooding they are not holding the fuel.   
Opening the throttle wide open while starting in modern fuel injected engines will shut off your fuel flow, this is an automatic built in process to help clear a flooded engine.
The fact you have to do this to start does again point to injectors as your problem.
I would not change any other parts till you fix this issue.
Yours failed at a very young age, not sure why but maybe the previous owner ran a bad injector cleaner through your system and damaged them.   I would replace all 8 before you do more damage to your brand new engine.   
GM does not make fuel injectors, they are probably OEM Bosch or Denso brand sold by GM.   Take a close up picture of your injector, the part number is usually printed right on it.
Many companies sell OEM type injectors that will swap in with zero issue.   I would do some reading on the Camaro and Corvette forums to see what brand those guys are happy with, I would not think twice about Marine, not important for this part.
If your OEM injectors are 24 lb injectors I would stay close to that number for your boat, if you find 26 or 28 lb injectors for a good price use them.   A small change will not affect you but stay with the same if possible. Do some reading or ask questions and make sure the new injectors are E85 compatible, that would allow more fuel choices in the future.
How does the new engine run?   I hope it makes you happy when it is running.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote MrMcD Quote  Post ReplyReply Direct Link To This Post Posted: May-04-2020 at 9:17pm
Injector reading for the LS engines: https://www.lsxmag.com/tech-stories/injector-specs-gm-fuel-injector-identification-and-cross-reference/
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Post Options Post Options   Thanks (0) Thanks(0)   Quote zwoobah Quote  Post ReplyReply Direct Link To This Post Posted: May-05-2020 at 12:34pm
Pull your fuel rails, leave the injectors and fuel lines attached. Put a thick rag topped with clean paper towels beneath each injector tip. Turn on the key to prime the fuel system, then turn the key off. Come back after an hour and see which injector is leaking down - you'll see gas soaked into the paper towel below the bad injector.

I had this problem on a BMW 330i. Car ran perfectly but was miserable to get started. Bad #4 injector caused the problem.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote poecs13 Quote  Post ReplyReply Direct Link To This Post Posted: May-09-2020 at 6:09pm
Only had a few hours at the lake today, so didn't get to do everything I wanted to or test thoroughly, but I think some progress made:

An acquaintance theorized that the excess fuel may be the result of a blocked return line from the Fuel Control Cell back to the tank. The excess fuel has to go somewhere, so probably into the rails and out the injectors. Also the only place for pressure to be relieved after turning off the engine. He suggested taking some extra fuel line and running the boat off of a five gallon can. When I tried this, it miraculously solved the hot start issue.

I ran out of time, and still intend to double check the injectors. But I'm cautiously optimistic that if I replace the return fuel line that we can finally put this thing to bed. I was able to blow through the line without too much resistance, but maybe the interior has deteriorated so there isn't adequate flow back to the tank? Does this seem plausible as a cause and viable solution?

My next trip out will be longer so I will have more time to thoroughly test this solution and double check the injectors.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Orlando76 Quote  Post ReplyReply Direct Link To This Post Posted: May-09-2020 at 10:44pm
What would you do... for a Klondike Bar?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote tryathlete Quote  Post ReplyReply Direct Link To This Post Posted: May-09-2020 at 10:57pm
If your injectors are not leaking and the tail isn’t over pressure I don’t see how the fuel gets into the cylinders unless the injectors are leaking or the fuel pressure Somehow rises after the pump is turned off.

Test and Replace injectors.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote gun-driver Quote  Post ReplyReply Direct Link To This Post Posted: May-10-2020 at 4:45pm
Originally posted by poecs13 poecs13 wrote:

I was able to blow through the line without too much resistance, but maybe the interior has deteriorated so there isn't adequate flow back to the tank? Does this seem plausible as a cause and viable solution.

No
if you can blow though it fuel can flow through it. I’m not very familiar with the Chevy system but I would assume there has to be a pressure regulator on the return line, that’s where I would start.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote poecs13 Quote  Post ReplyReply Direct Link To This Post Posted: August-15-2020 at 6:53am
So this story has finally drawn to a close, and thankfully a happy ending! Actually resolved the weekend of July 4, but of course with the site crash, no way to update here!

You guys were right, it did end up being a bad injector. Which one? I have no idea because I just replaced all eight at once. But the engine no longer floods ten minutes after shutdown. As a matter of fact, it runs just about perfectly now.

Many thanks to all for your advice and input! CCF is truly an invaluable resource!

Charlie
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Post Options Post Options   Thanks (0) Thanks(0)   Quote gun-driver Quote  Post ReplyReply Direct Link To This Post Posted: August-16-2020 at 11:26am
Did you end up with 2 hole or 4 hole injectors. Where did you get them, what is the part number, info for the next guy that has this problem would be great.
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