Hey whenever i hit the gas in my 05, the car kind of hesitates but still pulls. The AEM Wideband also reads 10.0 right away when it starts to get into boost.

It runs on E85, boosts to 25 PSI but its only hitting 20 PSI. Is this just a boost leak? It also flashes a occasional Check engine light, just flashes. One time it stayed on though and said fuel trim bank 1.

So is it just a boost leak? Tuning issue? Any help is appreciated in advance.

 

have you had the car tuned personally? If not, my car tells me knock readings through the CEL and that could be the deal with the light. Also, if it usually hits 25 psi and it is at 20 psi with 10.0 afr you certainly have a moderate leak. Everytime i have a coupler pop off mine reads 10.0 but usually goes into limp mode. But i would check for leaks for sure sounds like the issue.

 

Thank you sir.

 

haha im no expert by any means but its a good idea to check!!

 

the afr sounds normal for e85. the aem gauges only go to 10 and e85 afr's should be around 7.8-8.5 so that is going to always max out the aem gauge

 

see my point exactly lol i have no experience with e85 haha just my 2 cents!

 

Ummm..... e85 afr should be around 12.5 from everything that I've read not 7.5 to 8 and on pump gas it should be around 11.7. Reason being that e85 is less knock prone than pump 93 so u can run a little leaner and have less knock. 10 is way rich for pump and or 93 and could actually be lower since it reads to only 10. Do a boost leak test, if no leaks are found take it for the tune to be checked out. The check engine light flashing is usually a knock indicator that was set up when the car was tuned. And if im not mistaken the fuel trim bank 1 is the front o2 sensor I could be wrong on that tho. But 10 is definately rich for pump and e85.

 

Just FYI, the reason why you can run leaner with E85 than gasoline is not because of the higher octane (knock prone)... its because you have two different fuels, gasoline and ethanol (E85 mix), both do not have the same stoich value, so trying to use a stoich value based wideband is not going to give you an accurate reading.... that is where the other poster was getting to with 7.5-8 range... this is also a similar condition with meth injection

 

huh????????

 

had the same problem before

 

Im currently having this prob too, my shaft seals are leaking BAD and I have another small leak to tend to. Will def kill power and MPG. Do a boost leak test ASAP

 

wow you guys have a lot to read up on then......

Fuel ........................ AFRst ........ FARst ....... Equivalence Ratio ... Lambda
Gas stoich ................ 14.7 .......... 0.068 ................ 1 ................... 1
Gas max power rich .... 12.5 .......... 0.08 ................. 1.176 .............. 0.8503
Gas max power lean .... 13.23 ........ 0.0755 .............. 1.111 ............. 0.900
E85 stoich .................. 9.765 ....... 0.10235 ............ 1 ................... 1
E85 max power rich ...... 6.975 ....... 0.1434 .............. 1.40 ............... 0.7143
E85 max power lean ..... 8.4687 ...... 0.118 ............... 1.153 .............. 0.8673
E100 stoich ................ 9.0078 ...... 0.111 ............... 1 .................... 1
E100 max power rich .... 6.429 ........ 0.155 .............. 1.4 .................. 0.714
E100 max power lean .... 7.8 .... ...... 0.128 .............. 1.15 ................ 0.870

http://forums.turbobricks.com/showthread.php?t=73061

 

this isnt the end all be all but it gives you an idea

 

e85 requires 40% more fuel as opposed to gasoline. so how them is your ratio going to be higher?!?!? an aem e85 afr gauge.......according to awd or die you want to be at 12.5. why doesnt this gauge have 12 on it?!?!?


http://www.lancershop.com/customer/p...cat=100&page=1

 

Not correct. On a wideband gauge, set to gasoline reading, 10 is about 2 points too rich for WOT operation on E85.

Not correct. Stoich is the same 1 lambda no matter the fuel you run. On a wideband gauge, set to gasoline reading, stoich is 14.7 AFR (1 lambda) no matter the fuel you run.

E85 wot fueling, On a wideband gauge, set to gasoline reading, should be around 11.5-12.5 AFR depending on tuning strategy.