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SS Specific Service Issues/RepairsService/Repairs specific to the SS. Turbo-Brembo Brakes-2.0 Engine-Limited Slip Differential-Programmable Display-MU3 Transmission
The code you cited implies the fuel TRIM is rich. The trim richens in an attempt to make the A?F 14:1. If there is a big unmetered air leak it would cause the computer to dump fuel into the mixture, Excess fuel in the combustion chamber would flood the chamber and fuel would go past the rings into the crankcase.
The only way fuel can get into the crankcase is getting past the rings. That takes excess fuel in the chambers.
Or. The LNF engine has the high pressure fuel pump (HPFP). Since it is a mechanical pump, it may be possible for the HPFP to leak fuel back through the valve cover and into the crankcase.
Wouldn't be the first part we've seen as bad right out of the box.
I'll restate my point from above - if an injector were leaking more fuel into the cylinder than can be burned, wouldn't there be misfires?
And the point we were discussing about a damaged O-ring. I haven't been able to find a single diagram that shows an internal O-ring. The 2 o-rings shown here, if damaged, could only cause an external fuel leak. Not leak into the combustion chamber. Someone correct me if I'm mistaken please.
Which brings us back to the HPFP.
There is a limit to how much adjustment the ECM can make to fuel trims. The amount of fuel in the crankcase seems like much more than fuel trim adjustments.
I have a 2008 Chevy HHRSS 2.0 turbo I have oil and fuel mixed together..... I found some stuff about doing the high-pressure fuel pump and injectors both of those have been done.
Re: injectors, what does "been done" mean? Replaced? With stock? If so, are you sure they're the injectors for 2008-9 and not 2010?
Went back and scanned the entire thread.
Did you find the oil volume to be excessive on multiple occasions or just once? Do you have any idea what percent of fuel is in the oil? Is it possible that someone simply put too much oil in and you don't have prodigious amounts of fuel in the oil, just a little bit?
Are you running any kind of tune?
If your spark plug tips are uniformly black then yes it's probably running rich. I still think you should borescope it, now to look for excess carbon. Look at the valve too.
Re: injectors, what does "been done" mean? Replaced? With stock? If so, are you sure they're the injectors for 2008-9 and not 2010?
Went back and scanned the entire thread.
Did you find the oil volume to be excessive on multiple occasions or just once? Do you have any idea what percent of fuel is in the oil? Is it possible that someone simply put too much oil in and you don't have prodigious amounts of fuel in the oil, just a little bit?
Are you running any kind of tune?
If your spark plug tips are uniformly black then yes it's probably running rich. I still think you should borescope it, now to look for excess carbon. Look at the valve too.
Injectors have been rebuilt from top to bottom and cleaned (from a shop that does that stuff) I have done the oil 3 times and more that 5 quarts came out all times I also did the spark plugs and within 200 miles tips are black
Injectors have been rebuilt from top to bottom and cleaned (from a shop that does that stuff) I have done the oil 3 times and more that 5 quarts came out all times I also did the spark plugs and within 200 miles tips are black
What happened between the oil changes? How many miles? Highway? Around town? Track?
I have a constant problem with service tech overfilling my Ecotecs with oil, because they don’t allow sufficient time for the oil to drain to the pan before they check the level. This is why I asked if you know what percent of fuel is in the drain oil. Do you do your own oil change changes?
I see two possibilities: This problem it’s almost surely related to the tune. You didn’t mention what tune you’re using. If it’s custom, have you talked to your tuner? Maybe it also has a problem with O2 sensor.
What happened between the oil changes? How many miles? Highway? Around town? Track?
I have a constant problem with service tech overfilling my Ecotecs with oil, because they don’t allow sufficient time for the oil to drain to the pan before they check the level. This is why I asked if you know what percent of fuel is in the drain oil. Do you do your own oil change changes?
I see two possibilities: This problem it’s almost surely related to the tune. You didn’t mention what tune you’re using. If it’s custom, have you talked to your tuner? Maybe it also has a problem with O2 sensor.
I do my own oil and it was like 200 miles in between oil change just driving regular, it has a zzp stage one tune on it so it’s not really a tune according to them it’s more of a sensor tune if you know what I mean, o2 have also been replaced I have also done a cylinder leak down test and everything is within spec it’s also has a new hpfp from zzp and rebuilt injectors, im going to get a good scanner and see if im losing fuel pressure when the car is off and see if its just dumping it in the cylinder because i cant think of anything else wrong with it
I do my own oil and it was like 200 miles in between oil change just driving regular, it has a zzp stage one tune on it so it’s not really a tune according to them it’s more of a sensor tune if you know what I mean, o2 have also been replaced I have also done a cylinder leak down test and everything is within spec it’s also has a new hpfp from zzp and rebuilt injectors, im going to get a good scanner and see if im losing fuel pressure when the car is off and see if its just dumping it in the cylinder because i cant think of anything else wrong with it
Betcha all ur mechanicals are working fine and obediently following iffy instructions from the ECM. Canned tunes are best thought of a starting point, especially with mechanical mods. Wouldn’t hurt to double-check for intake leaks.
