Wideband/Running lean issue
06-09-2014, 08:49 PM
#64
Ok, so I tried swapping fuel filters, but used a larger fuelab filter that came off my buddies 970 rwhp Turbo Camaro. Same story, lean. Next, I tried his Aeromotive FPR. Still lean. I cranked up pressure and it rises at idle like it should. Dropped it back down and all seemed well. I even took my fpr apart and it looked fine.
How stupid would I be by pulling the filter element out of my filter and running the car like that quick to see what happens? Would it cause fueling issues regardless without having the filter in there to help build pressure? I honestly don't know. Ha.
I still have a stock style filter in my return line since my stock feed line is now my return. I am going to change that out too just for the hell of it. If none of this works then I am truly at a loss. Why does something seemingly so simple have to turn into a damn mind ****.
How stupid would I be by pulling the filter element out of my filter and running the car like that quick to see what happens? Would it cause fueling issues regardless without having the filter in there to help build pressure? I honestly don't know. Ha.
I still have a stock style filter in my return line since my stock feed line is now my return. I am going to change that out too just for the hell of it. If none of this works then I am truly at a loss. Why does something seemingly so simple have to turn into a damn mind ****.
06-10-2014, 07:08 AM
#66
Yea, get that return line filter out of there asap as that should be wide open. If you pull the filter you could run it and see what happens. You could also tap into the fuel pump wiring and monitor voltage (or log it if possible) while pressure is dropping.
06-10-2014, 07:10 AM
#67
.I will install my filter without the element and run it quick. Outside of some weird blockage somewhere in my fuel system, I don't know what else it would be. I should have more than enough pump for the car.
06-10-2014, 07:14 AM
#68
Another good point. I DO need to monitor voltage at the pumps for sure. Any ideas on how to get the return filter out of there since I am using the stock fuel line as my return? I should say without making a complete new line. If I go that route then I will just order some -10 and make that my new feed and use my existing -8 feed as the new return. Something I should have done up front, but it worked great all last year and for a week or so this year.
06-10-2014, 07:15 AM
#69
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Every 3 or 4 tanks of E85 I take my filter out and clean it. It's the stainless mesh. I had a going lean issue that was caused by a clogged filter. All of my lines are rated for ethanol, but I have still noticed signs of deterioration and my filter reflected that.
06-10-2014, 08:26 AM
#71
I have been reading numerous threads in which guys have used the stock feed as a return and keep the filter in there. I am going to replace that filter tonight, and put mine back in with no element and take it for a drive. If this doesn't show any results then I will hook up something to check for voltage at the pumps.
I keep going back to the wideband, but it seems to be reading accurately on spring pressure. Also, for as much fuel as I have thrown at it in the tune, I would think it would be super rich and run like garbage. It still pulls hard and seems to run fine, just lean.
06-12-2014, 07:01 AM
#74
On to checking voltage. Put my filter back on without the element in it and made little to no difference. One weird that thing did happen was my wideband dropped to 8.9 during the 2nd WOT pull, then went full lean, then back full rich. I thought maybe it was giving me issues again. However, it seemed to read right after that. Either way, something in the fueling isn't correct. Fuel pressure still will not rise on a 1:1. A buddy and I are going to rewire some stuff, and check over everything. Probably should add a few more grounds, although voltage never dropped below 12.9 during a run and sits at 13.1-13.2 according to the scanner at all other times.
Outside of checking for voltage, and completely re-doing my fuel system, I have no idea what to do. If voltage checks out, I guess that's the next step I take.
Outside of checking for voltage, and completely re-doing my fuel system, I have no idea what to do. If voltage checks out, I guess that's the next step I take.
06-12-2014, 07:22 AM
#75
On to checking voltage. Put my filter back on without the element in it and made little to no difference. One weird that thing did happen was my wideband dropped to 8.9 during the 2nd WOT pull, then went full lean, then back full rich. I thought maybe it was giving me issues again. However, it seemed to read right after that. Either way, something in the fueling isn't correct. Fuel pressure still will not rise on a 1:1. A buddy and I are going to rewire some stuff, and check over everything. Probably should add a few more grounds, although voltage never dropped below 12.9 during a run and sits at 13.1-13.2 according to the scanner at all other times.
Outside of checking for voltage, and completely re-doing my fuel system, I have no idea what to do. If voltage checks out, I guess that's the next step I take.
Outside of checking for voltage, and completely re-doing my fuel system, I have no idea what to do. If voltage checks out, I guess that's the next step I take.
06-12-2014, 08:11 AM
#76
I can assure you it isn't in the tune. It ran perfect on the dyno and street while being tuned. If it was some Joe Schmoe who tuned it, or if we had problems tuning it, then I could possibly see it being in the tune. Also, there was very little in the tune that changed from last year. Some VE tweaks, small timing changes, and idle stuff is all. I drove it on my old tune a few times (I did make some small VE changes) and had no issues either.
I have added almost 30% fuel in some areas and am seeing no change. If the car was really getting that much more fuel, I feel as if it would be bogging down something fierce. Injector duty cycle is almost 90% on 12 lbs. too which should not be even close to that high. If it weren't for the wideband reading lean, and the fuel pressure gauge dropping in boost, I would think no differently of the car. It still pulls hard and seems to run well.
Will be checking voltage at the pumps this weekend.
I have added almost 30% fuel in some areas and am seeing no change. If the car was really getting that much more fuel, I feel as if it would be bogging down something fierce. Injector duty cycle is almost 90% on 12 lbs. too which should not be even close to that high. If it weren't for the wideband reading lean, and the fuel pressure gauge dropping in boost, I would think no differently of the car. It still pulls hard and seems to run well.
Will be checking voltage at the pumps this weekend.
06-12-2014, 09:09 AM
#77
I can assure you it isn't in the tune. It ran perfect on the dyno and street while being tuned. If it was some Joe Schmoe who tuned it, or if we had problems tuning it, then I could possibly see it being in the tune. Also, there was very little in the tune that changed from last year. Some VE tweaks, small timing changes, and idle stuff is all. I drove it on my old tune a few times (I did make some small VE changes) and had no issues either.
I have added almost 30% fuel in some areas and am seeing no change. If the car was really getting that much more fuel, I feel as if it would be bogging down something fierce. Injector duty cycle is almost 90% on 12 lbs. too which should not be even close to that high. If it weren't for the wideband reading lean, and the fuel pressure gauge dropping in boost, I would think no differently of the car. It still pulls hard and seems to run well.
Will be checking voltage at the pumps this weekend.
I have added almost 30% fuel in some areas and am seeing no change. If the car was really getting that much more fuel, I feel as if it would be bogging down something fierce. Injector duty cycle is almost 90% on 12 lbs. too which should not be even close to that high. If it weren't for the wideband reading lean, and the fuel pressure gauge dropping in boost, I would think no differently of the car. It still pulls hard and seems to run well.
Will be checking voltage at the pumps this weekend.
I hear you, wasnt trying to discount your current tune by any means. Just figured a new set of eyes might see something that has been obvious but you just got used to seeing.
