[Jmore92]

I've been having issues with my car lately , my jb4 code reading would only tell me Miss fires in cylinder 1, 5,6 and several. And lately a after cat lambda code?

Today I scanned with mhd and got this.

Is a shadow code an active? Is that we're my issue is hpfp?

[Jmore92]

Anyone?

[RocketSurgeon]

Shadow codes aren't currently active, or haven't occurred enough times to "set" and throw a light.
1-you have under boost from either a boost leak, damaged vacuum line, or boost solenoid.
2-the O2 sensor code is post-cat, not a lambda probe. Lambda sensors are wideband O2 sensors, pre-cat only.
3- many of those fuel pressure codes are common on tuned cars and don't always indicate a problem. Can you post a log with fuel pressure?
4. The DME coding fault is likely just from the backend flash.
5. The misfires are likely ignition related.

[Jmore92]

Thanks for the input.
I tried logging but it looks like it didn't save I will figure out why latrr and get a log up.

Boost leak very possible. I'm experiencing the following

.most of the time a rough idle for ccold start, after cold start car runs and idles perfect

.some times , not often but sometimes. Longer cranks. Not terrible laby 2-3 seconds and not instant.

.max boost I can make is about 5-6psi before the engine starts to break up. Anymore gas or pedal it will missf fire and stutter

Missfires are definitely not ignition , I ruled that out. Had brand new Delphi coils and plugs, I swapped them put again for new eldor coils and ngks just in case and it's still the same.

I do have a aftermarket ftp pcv valve. And at one point I would hear a loud whistle, like a bov but it didn't sound like my tial. Im wondering if a bad pcv valve can cause these vacum issues?

Then again my car has higher miles and the vacc lines could be worn.

My first thought were O2 sensors because of mutiple cylinder miss fires. Lean miss fires from hpfp,. I have a brand new stage 2 lpfp. Or injectors going out

I'll get a log up, and will probably start with replacing alll vacumm lines just incase

[RocketSurgeon]

You're running an e85 backend flash...
How much ethanol are you running? How much boost are you targeting?
Eldor coils are a little sketchy, but it sounds like you had problems before that.
If you're running big ethanol or big boost, you might need an upgraded ignition like Precision Raceworks or BimmerLife. What plug gap are you running?

[buster84]

Originally Posted by RocketSurgeon

You're running an e85 backend flash...
How much ethanol are you running? How much boost are you targeting?
Eldor coils are a little sketchy, but it sounds like you had problems before that.
If you're running big ethanol or big boost, you might need an upgraded ignition like Precision Raceworks or BimmerLife. What plug gap are you running?

Im running full e85 with over 650hp at 32psi, ignition upgrades arnt needed unless your aiming for maximum power or efficiency.

As for the e85 tune, if the op is running to much on the stock fuel system this is his problem. A lpfp upgrade is not enough for full e85 at all.

Op, what are your mods? Post up a 3rd or 4th gear log.

[Jmore92]

The only reason I switched from Delphi to eldor was because of the possibility my car didn't like Delphi for whatever reason. And aperantly eldor are currently used by bmw

Car is on a e85 backend flash, was running 75% e85. Before with no issues, ran very strong After about 2 weeks then I started miss firing, switched to eldor and ngk and still missifirng. My station was tested at e70 which would put me in around e50-55

Car has the following

.vsrf charge pipe w/ tial
.vrsf HD 7" intercooler
.custom stock box Intake
.ngk gapped at .022
.ftp pcv valve
.oil catch can
.fuel it bucketless stage 2 lpfp

Jb4 g5 and mhd e85 back end flash

I'm not able to go full WOT as the car will stutter and misfire.

All I can think of for missifirng are the following

.injectors causing lean missfires
.hpfp casuing lean missfires
.O2 sensors casuing missfires across the board
.possible bad aftermarket pcv vavle? I have read this can cause similar issues to what I'm seeing
.boost leak can cause missfires??

.not ignition it's literally brand new
.not lpfp it's brand new

The longer cranks tell me fuel issue? Lumpy cold start says fuel or vacum issue?

I will attempt to get a log of what I can

[buster84]

Originally Posted by Jmore92

My station was tested at e70 which would put me in around e50-55

Never go by what the station thinks they have. If you dont have a flex fuel sensor then you should be testing the e85 at the pump and calculate from there. I have a sensor and there are times i get e85 which turns out to be e70, but recently i filled up and it was e88. I was actually suprised it was higher than before. I'm not sure if the gas stations mix there e85 stuff at the station or if they get it premixed and delivered. Either way everytime they fill up with new gas it mixes with the old which is why e85 has a bigger variance compared to regular gas.

Originally Posted by Jmore92

Car has the following

.vsrf charge pipe w/ tial
.vrsf HD 7" intercooler
.custom stock box Intake
.ngk gapped at .022
.ftp pcv valve
.oil catch can

Jb4 g5 and mhd e85 back end flash

You dont have any fuel mods at all, not even a lpfp upgrade. So your running entirely on a stock fuel system. I'm not suprised one bit that your getting missfires. I wouldnt run e50 unless you know for sure your fuel system can handle it. Depending on the mileage of your car your hpfp, and lpfp your pumps could be tired. E50 on stock is REALLY stretching your fuel sytem. At a minimum you need to get a lpfp upgrade. Even with a new lpfp your still running a weak fuel pump setup. Upgrade your LPFP if you plan to run e85. E85 also can damage your oem fuel pump with lots of continious exposure since there not designed for e85.

Originally Posted by Jmore92

I will attempt to get a log of what I can

A log is definitly needed. Its the only way we can determine if your running to much ethanal for your fuel system.

[Jmore92]

Yes buster84 I have a brand new stage 2 fuel-it bucketless lpfp. Iforgot to add that

Car was walnut blasted in the past 500 miles.

Yes I understand stations vary Everytime new fuel comes in. But running map 5 I was having no issue within small variences. The e85 back end flash was designed to run e40+ which I'm sure I'm over

Il get logs on my free time

[Jmore92]

Ok guys I drove the car around. First 2 are just cruzing, last 2 I went full wot for a little bit.

I don't know what to make of it. Boost is everywhere
Experts please chime in

[Jmore92]

2

[Jmore92]

3

[Jmore92]

4

[Jmore92]

It's not controlling boost very well. so would it be safe to point at the boost solenoids? My car does have higher mileage , could still he the originals.

[addictedtoboost]

Try replacing your fuel injectors with index 12. There is a good chance you have leaky injectors.

[Jmore92]

Possible, I'm trying to rule out other things before I do injenctors. I started by undoing the "exhaust tee mod". Idle is alot better now, no more ugly stuttering and jerking cold starts. While it still a TINY bit rough, barely notiiceable. Could be the e85 I'm running as well. The car starts right up with no more agresive lumpy idle. I have ordered boost solenoids and will get back to you guys when they arrive and are put in

[Jmore92]

I changed out the boost solenoids but made no difference. At least now I don't have time worry about them. But there's still something else going on. I have noticed my mpg dropping considerably.

Any input?

[cortez08]

Originally Posted by addictedtoboost

Try replacing your fuel injectors with index 12. There is a good chance you have leaky injectors.

X2

[MysticRob]

You're running a very custom setup, and between the long crank, misfiring, and decreasing MPGs, sure sounds like injectors to me. What index are you running? Have you rechecked the spark plugs to see if they appear wet? New plugs and coils and no change doesn't leave many other options...

[arkie6]

Originally Posted by Jmore92

... I have noticed my mpg dropping considerably.

Any input?

MPG based on actual miles vs. gallons calculated or based on what the computer is telling you?

I recently changed my injectors from index 7 to index 12 due to rough starting issues. Prior to changing the fuel injectors, my computer was typically showing 8% to 10% lower MPG than I calculated by actual miles vs. gallons used. After I changed my injectors and coded them, computer indicated MPG almost exactly matches hand calculated MPG. And it fixed my rough idle.

I suspect I had two things going on, 1) the injectors were leaking after shutdown causing the rough idle the next time the car was started, and 2) the injectors were partially blocked resulting in less fuel flow than the computer was assuming. I was also getting intermittent codes for bank 1 and bank 2 too lean. This is on a completely stock car running 93 octane.

[arkie6]

Are the injectors and other parts of the fuel system from 10 years ago designed to handle high amounts of alcohol in the fuel such as E85? I know with small engines (lawn mowers, chain saws, etc.) that even E10 over time deteriorates the soft parts in the fuel system requiring periodic replacement. I can imagine that E85 does some damage to soft parts not designed for that amount of alcohol.

[Jmore92]

I'm starting to lean towards injectors yea. Long cranks are gone for now. After I plugged up the exhaust flap mod (went back to using the flap) I haven't had any rough starts (knock on wood) it's been very cold in my area and I remember pople having issues with exhaust flap vacum line in cold weather. Granted minee wasn't ziptied. Just a piece of a rivet to put it up

My cold parts are MILDY lumpy. No we're near as bad anymore but u can tell there's a slight inconsistentcy in the cold start.

I have since then swapped out the boost solenoids . The old one mode rattle noises when I shook em and we're originals so I'm happy I changed them out. But still the car has the same issues

I'm going to inspect all my vacum lines .then possibly look into O2 sensors . Lastly injectors since it's the biggest hit. As of right now I don't know what index I have