Ok so I get my car tuned on e85 running 30psi runs great for about a week and then it starts cutting out like fuel cut . changed plugs changed pump. put in my double pumper set up. compression test, boost leak test all comes out good and the car still cuts out took back up changed stuff on my tune still cuts out I'm lost any help would be much appreciated

 

Doublecheck to make sure its not dropping fuel pressure. Also pull the injectors and look at the tips. If you see the dreaded "black goo" good chance you got some contaminated E85 and they need to get sent out to get cleaned.

If its just dropping fuel pressure it could be the pumps, fuel filter, etc.

 

Check your cam sensor and connector make sure your getting good contact in the terminals...

 

what are your plugs gapped at?

 

I've put 2 walbro 255s in aeromotive fpr, I ran my walbro and my stock pump wired constant just to see if I was having fuel drop off and no different. I had NGK bpr7es gapped at 22 now I have br8es gapped at 25 and still cuts out. Ill pull the injectors out tomorrow and see if there plugged I hope not there new.

 

I was wondering if I was getting spark blow out now?

 

Those are pretty big gaps for 30 psi. Try .018" to .020"

 

Alright I'll gap them down to .18" tomorrow

 

It's just weird it ran really good for the first week then bam, runs like crap

 

These are the bpr7es I pulled out

 

Beside the injectors and the plug gap anything else to check?

 

I see you're in Iowa. It may be slightly cooler than when you were tuned. Possibly hitting slightly higher boost levels and/or higher loads cells.

You may or may not have spark plug blow out. You may have fuel cut from exceeding the load level your tuner set you up for. All this needs to be brought up to your tuner to help diagnose.

You can check your pump and injectors. Check the fuel pressure and IDC.

What are you using for boost control? EBS or MBC?

 

Ebc. I am using the aem tru boost

 

Perfect! Next time it cuts out look at your peak boost on the tru boost and/or log it. It may be slightly higher than 30 psi. You can adjust your tru boost settings or make a separate one for colder weather.

 

Wish everyone was like you willing to help out