DO A BOOST LEAK TEST.

For f#cks sake. You said your car doesn't have a boost leak, then you found a boost leak without even doing a boost leak test. How many more does it have?

 

lmao. Preach on brother.

"HEY GUYS WHAT DOES THE INTERNET THINK?"

"DO SOME WORK"

"HEY GUYS WHAT DOES THE INTERNET THINK?"

"DO A BOOST LEAK TEST"

"NO BUT SERIOUSLY, HEY GUYS WHAT DOES THE INTERNET THINK?"

"DO A BOOST LEAK TEST"

facepalm.gif

 

lol. don't have a boost leak tester or would have done that already

 

You can buy/use this on a 2.5 inch inlet turbo

http://www.torquesolution.com/product-p/ts-blt-25.htm

or make your own

https://www.evolutionm.net/forums/ev...er-5-02-a.html

 

Alright guys. Checked for boost leaks today. Only one we found was the throttle body shaft seals. Going to replace those. So we checked the fuel pump (so we thought). Tried 3 different fuel pump housings to see if maybe one of them was clogged, nope. The fuel pump looked fine so we assumed it had to be the injectors at that point. It was the only thing left on the list. Because surely the AEM 320lph pump couldn't fail with less than 1000 miles on it. So he tells me to go ahead and order a set of injectors, bring the car back and we'll retune it.

Otw home now (2 hour drive). About 45 min into my drive i stop to fill up my tank with 93. Everythings fine at this point. get back on interstate and within 5 minutes the car goes completely lean just cruising on the interstate. Then it bogs down and will barely move. Almost revs as if its in a limp mode. Stuck on interstate. Had to get towed home..

Long story short, were pretty sure its the fuel pump.

I'm going to throw my walbro 255 from my old tune in there tomorrow and see if it runs. If it does, then that should be my problem.

 

More fuel pressure problems but no fuel pressure gauge?


There's always more than just one problem too.

 

Well problem still persists. I just want to give quick run down in case you are just coming in and don't want to read everything..

06 Evo 9. 52k miles. FP Red, bolt ons, tune.. aem 320lph e85 pump / stm fuel pump rewire kit.

Been tuned for 2 months running absolutely perfect up until this....

1. Went to 1/4 mile, ran fine. At track found broken cam sensor, replaced it with new autozone one.
2. drove home (2 hours) car ran 100% perfect. filled up with gas when i got back into town
3. parked car in garage
4. 2 days later.. tried to install new fp 84mm intake. car started up then died. needed me to tap gas to stay on. afrs were lean off the board. 13s WOT and idle afrs were going to ---. (this is on e85)
5. switched to pump gas. cruise and idle AFRs are normal. WOT afrs are still not where they were.
6. boost leak tested it, only one was TB shaft seals.
7. replaced fuel pump with brand new same version (aem 320lph e85 pump), problem still persists.

Car drives 100% normal other than WOT afrs being way too lean.

I bought another car to toy with last week and honestly the evo has been sitting since then.

Injectors is the only thing i can think of at this point

 

check the fuel filter in the fuel pump assembly (the big plastic white thing that holds your fuel pump)

they clog up every once and awhile with e85. New housing is $150 or so and only way to replace filter

 

already did. Swapped the pump into 2 different housings/filters and nothing improved.

 

bump

 

Are running a speed density tune? If so are you using an Omni 4 bar MAP sensor?

 

No. still on maf

 

Did you replace the leak TB shaft seals? Those can be a significant leak..

 

i thought boosts leaks, outside of the MAF -> turbo, would cause it to run richer?

 

Regardless of what they do (they enrich WOT), you're trying to fix a problem, whilst leaving another problem untouched. Your car has a vacuum leak at idle. Which is skewing fuel trims. And depending on the tuner could be playing with WOT fueling.


You're diagnosing an issue. You should be fixing problems as they arise. Not finding a problem and then saying, "oh that won't cause the present issue," and then proceeding to something else.