Thewafflesareburnt's Toasty Fresh Build Thread
03-08-2016, 01:18 PM
#102
Do you have a wideband to see where your air/fuel ratio is? One time my MAF sensor wasn't reading right and my air/fuel leaned way out and acted like you are describing.
I have an 06 so I don't know if it is something they changed by 08 but my knock sensor was making my engine pull serious timing robbing ton of power. Didn't make it stutter though.
I also had a vacuum leak the first time I put an SC on. I tracked it down with a can of brake cleaner. I just sprayed it on the outside of suspect spots and you can hear the engine rpm change if you hit a spot with a vacuum leak.
I have an 06 so I don't know if it is something they changed by 08 but my knock sensor was making my engine pull serious timing robbing ton of power. Didn't make it stutter though.
I also had a vacuum leak the first time I put an SC on. I tracked it down with a can of brake cleaner. I just sprayed it on the outside of suspect spots and you can hear the engine rpm change if you hit a spot with a vacuum leak.
03-08-2016, 01:21 PM
#104
Well after hunting for vacuum leaks all morning I don't have any anymore. The problem persists. I don't have a wideband which I know I really should. It will pull just fine through the rev range at 1/2 to 3/4 throttle it's only when I push it that it lurches and stutters
03-08-2016, 04:10 PM
#117
Make sure you use dielectric grease or something similar on the o rings of the injectors. Also check the SCIP sensor, I had a vacuum leak there. If you have a boost/vacuum gauge it should be around -18inHg of vacuum at idle and if there is a vacuum leak it may read closer to -10inHg, as it did in my case.
03-11-2016, 01:15 AM
#120
I'm almost at the point of giving up and changing back to n/a. I love the boost and whine, but this is my daily and I don't the time or money to buy a second tune or hptuners. And even if there was someone in the houston area with hptuners they could easily be 2+ hours away and still be "houston area"
03-11-2016, 09:18 AM
#121
How did you check for vacuum leaks? I got all my vacuum leaks fixed and I pull about 20 inches of mercury sometimes 21. 16-17 seems a bit low.
With your mix of gas in there, one thing to try might be to add a good name brand of octane booster. Doubt you would be having problems at that low of load with 3.1" on M62 but it could be knocking a bit. Do you know what degree timing your tune commands at WOT? I was around 16.5 with M62 on stock internals. If you are turned up to hot combined with the mix of gas that could be giving you problems. I'm pretty sure our cars have no real way of checking the octane other than the knock sensor.
If you are having misfires your computer should catch it and if you have an OBD you can verify. If you are running lean I think you might be able to take out your spark plugs and they may have a whitish tent to them.
Anyway you could get a video of what it is doing?
With your mix of gas in there, one thing to try might be to add a good name brand of octane booster. Doubt you would be having problems at that low of load with 3.1" on M62 but it could be knocking a bit. Do you know what degree timing your tune commands at WOT? I was around 16.5 with M62 on stock internals. If you are turned up to hot combined with the mix of gas that could be giving you problems. I'm pretty sure our cars have no real way of checking the octane other than the knock sensor.
If you are having misfires your computer should catch it and if you have an OBD you can verify. If you are running lean I think you might be able to take out your spark plugs and they may have a whitish tent to them.
Anyway you could get a video of what it is doing?
03-11-2016, 01:05 PM
#122
I will get a video today. No misfires and no vacuum leaks I took the whole thing apart and back together yesterday. I will check the timing also. I have also put more premium in the car since the first time because it is absolutely drinking has. I have averaged 16-17 mpg. Thank you for other things to check.
I also found a place in Houston that will dyno tune the car for $600 so that may be an option down the road
I also found a place in Houston that will dyno tune the car for $600 so that may be an option down the road
03-11-2016, 01:17 PM
#124
Wow with that gas mileage I almost wonder if you're running too rich. If that is the case your spark plugs might be black. Have you noticed any black smoke out of your exhaust? I am averaging 22mpg with TVS 2.9" and 650CC injectors and I have been doing a lot of test pulls.
When you put the intake manifold back on did you use a new gasket? I think they are kind of a "crush" gasket and don't work as well after they have been compressed. If you spray some brake cleaner around the edge of the intake manifold and your idle bogs down (that is where I had a leak the first time because ZZP gave me the damn LNF gasket on accident) that is where the leak is.
I also know that my initial "canned tune" needed a lot of revisions before my car was running right at all. I am assuming that is the option from ZZP as they don't do data logs? So it really could just be your tune.
When you put the intake manifold back on did you use a new gasket? I think they are kind of a "crush" gasket and don't work as well after they have been compressed. If you spray some brake cleaner around the edge of the intake manifold and your idle bogs down (that is where I had a leak the first time because ZZP gave me the damn LNF gasket on accident) that is where the leak is.
I also know that my initial "canned tune" needed a lot of revisions before my car was running right at all. I am assuming that is the option from ZZP as they don't do data logs? So it really could just be your tune.
