I'll rip into the car once I get back into town, I want to call the o2 sensor good seeing that it has maybe 5,000mi on it. The wideband is on a separate sensor I will log and look at the differences.

I didn't take the MAF into consideration, most likely due to the frustrations of one thing after another but I shall add that to my list of places to check.

Clutch wise, I'm on stock clutch, which is getting replaced pretty soon also looking into upgraded ZZP injectors or seals I haven't made up my mind on which route would work better long term.

The biggest problem with the car is I understand these things will not run 100% perfect when pushed for as long as mine has been pushed, but I've been sitting on my big turbo and built trans upgrades for the past 8 months. It seems like every time I get ready to pull her apart something different goes out on the car almost like she's fighting the upgrades.

-Alex

 

I think pretty much every '08 running some form of E has replaced or will replace their injector seals. Even if they're not causing your current issue, it'll just be something else that goes wrong down the road if it's not addressed in the meantime. Knowing that, I'd suggest it be your first step and see how she does before throwing more money at it. At best it'll fix it, at worst you will have done some preventative maintenance.

 

Noob alert. Havent paid much attention, but what are symptoms of bad seals? Never ran E but curious

 

A couple others mentioned it in this thread...basically under heavy throttle your engine may sound like a machine gun. Can also do crazy things with your AFR.

 

Like cause my light stumble at part throttle ie cruising?

 

I'm not sure if it was the late 09s or just 2010s but GM switched to an ethanol friendly seal on the injectors.

I have seen on here probably 10 people that have had this happen. Many describe it as popcorn or a machine gun sound. Just have to order the updated seals and tool and replace them.

 

Highly unlikely to be your seals if you have never run any ethanol mix. Plenty of other things I'd check first...air filter, maf, throttle body, spark plugs, etc.

 

my car is running like complete poop right now, and idles terrible, but only on the boost gauge does it jump around, my speedo looks perfect.
On deceleration, it backfires like crazy, and under acceleration it stumbles real bad.
i have a huge loss in low end power as well, but im ssuming all of my problems is a bad stock turbo...

 

Sounds like plugs.. or any amount of things.

 

Could be many things knowing my luck brother, lol

 

KNN SRI, plugs were replaced with ACdelcos 10k ish ago, maf probably does need cleaned. Throttle body hasnt been serviced in hr 92k miles but had a seafoam treatment at around 85k

 

 

4-10 HP at the wheels? What on a 20 year old vehicle?

 

Damn, thats rediculous...lol

 

I have this on my solstice GXP, (LNF also) Going to have the shop who is doing the downpipe today check on the o2 sensors as well.

 

**UPDATE**

So I got back with my tuner after replacing the forward 02 sensor and maf, after data logs this is what I was told.

"we've determined the issue you're running into is DI pump saturation (high pressure pump overrun as the primary issue). Though E47 generally works OK on the LNF without that happening, I'd suggest making sure the low pressure pump is keeping up, and if it is, you will need to run a lower percent E mixture"

With that said, anyone have recommendations checking the intake pump or should I just go about replacing it? I've looked into the HPFP and there are no signs of leaks other than the oil from the head cap at the end of the cam, which I'm about to fix in the next 30 min.

-Alex