6.0 with P0300 and loss of power

[mikekey]

Clogged injectors?

It's possible. It would have to be more than one. Would I pull the fuel rail and look at them? Would I be able to see if they are clogged?

[DustinC1989]

Clogged injectors?

It's possible. It would have to be more than one. Would I pull the fuel rail and look at them? Would I be able to see if they are clogged?

If something was clogged externally (something on either end) you could see it. The rail and injectors would have to be pulled, which isn't to horrible
Internal clog, unfortunately would not be visable unless you have transparent injectors or know how to rebuild injectors.

[v7guy]

When Mike mentioned the cam sensor I thought it was crazy talk, but as it turns out there's a few trouble shooting charts that lists it. I was wrong in discounting it.


The MAF code is interesting because a dirty MAF pops up quite a bit in the charts when you're looking at diagnosing a random misfire. A good ole q-tip with some alcohol used to be a popular way to clean em (it takes a very light touch). There's also MAF spray you can use.


I've also read a few trouble shooting charts that mention a coil going bad can manifest itself as a multiple misfire for a few days until it finally kicks the bucket.


I'm truly at a loss for what the problem actually is.

[Karo]

I had a problem like that and it had turned out it was a bad coil. Did you have a chance to monitor the misfires from which cylinder? My aeroforce gauge could do that. Changed the place of the coil and it went from cylinder 1 to 4 so this was easy to diagnose and replace.

[Trail X]

Keep in mind this is the 6.0 L v8, not the I6.

The MAF sensor does sound suspect. The engine's gotta know how much air is being pulled into the engine, and if it doesn't, it will fall flat on it's face when you try to give it power. I'd say a rough idle could be a IAB (assuming the LS has one), but since it's falling flat under power, it's probably not that since the air through the IAB is so minimal comparatively at higher throttle inputs.

I'd certainly start with the MAF. Try cleaning it, see if there's a difference. If no difference, try unplugging it, see if there's a difference. If no difference when unplugged, then I would suspect that your sensor crapped out. Might try that same tactic with the intake air temp sensor. Have you checked the O2s? Could be that one of those went bad.

Do you have a Scangauge to help with your troubleshooting? It would make sense to check as many sensors as you can for sensible data. Try making sure the TPS is reporting properly, make sure the IAB is reporting properly, intake temperature, fuel pressure (if reported), closed loop or open loop, a/f ratio, there may even be a way to read raw data from the MAF sensor.

[ErikSS]

It's clogged exhaust for sure. I took the Y pipe down and the power came back. It didn't sound bad either. Haha I need cats installed before Friday! Time crunch!

[DustinC1989]

Texas Speed Long Tubes and off road Y

[ErikSS]

Texas Speed Long Tubes and off road Y

I would have XSPower long tubes on it already if I didn't have to have cats. I'm in an emissions area.
XSPower has 1 pair of catted pipes built and being tested... But I can't seem to talk them into sending me a set ASAP.

[mikekey]

Emission tests, lame. Is it a visual inspection or a sniffer test? We used to get past the visual in VA by just getting high flow cats and emptying those suckers with a pipe then welding them up. I still agree, LT's and a free flowing exhaust are going to be a lot of fun on that rig.

BTW:

Catalytic converter, that's what I told you.

[HARDTRAILZ]

Might be the Cat...

[v7guy]

You sure the cat isn't just the symptom of a problem?

[HARDTRAILZ]

Might need a dog to chase the cat.

[mikekey]

Should of bought a Ford, just saying.

[HARDTRAILZ]

A good ole CRaptor

[DustinC1989]

Oh, emissions test state.... that sucks.
Just hollow out the cats for this weekend and replace them before you need tags again. Might get a P0420 code, but it isn't going to effect anything

[ErikSS]

After figuring out that my SS ran great with only manifolds for exhaust last night, I started research. Turns out the Fedral Regulation on Catalytic Converter warranty is 8 years or 80,000 miles. I'm JUST inside of that. After a long talk with my local service advisor, he agreed that I had a strong chace of getting it covered under warranty. With that looming I decided to put it back together and bring it down. I hooked up everything back to the flange behind the Y pipe. No surprise, it ran just like it did with the clogged Cats. I figured it was one last thing to rule out. I find out tomorrow if they are covering it for sure. I do know the dealership has a Y pipe in stock!

[Regulator1175]

For what its worth, I spent the better part of an hour last night trying to talk Erik into just bringing it as it was. I wanted to here that truck running with a wide open exhaust. However he kept whining about getting tickets and impounded!

[mikekey]

Open headers is straight up redneck. I still vote get some LT's Eric and shove a pipe thru your cats.

[ErikSS]

According to the dealer, I have an exhaust leak and a bad O2 sensor. When I asked how that could cause such extreme conditions they told me that it has to do with the fuel map. So I asked if that's the case, why would it run better with NO O2 sensors and a MASSIVE exhaust leak. He explained that the base line is probably ok, but the curve from the O2 sensor is making my engine run super rich. So I asked if that's the case, shouldn't it run the same with that O2 sensor unplugged as it does with no O2 senor's? He agreed that the logic works. So I went home to unplug the O2 sensor, and found it WAS unplugged. I cannot say if I didn't get it plugged in right and it fell apart, or if his tech unplugged it and didn't plug it back in. Either way, I'm unhappy with the tech. It suggests the data is skewed. Also, it PROVES that unplugging the O2 sensor and sending that to base signal does NOT affect the major engine performance.
When I got a hold of the service department manager, he explained a few things to me that make sense about warranty process. So I attempted to suggest a way to see what I'm trying to explain happens, to which he responded "I don't care what you want. I need my tech to diagnose it." To which I responded "If your tech can't put an O2 sensor plug back on while diagnosing a vehicle to need that very O2 sensor than you need a more trustworthy tech."

Signed,
NOT HAPPY

[TBYODA]

So it sound like they don't want to warranty shit it seems.