[KaiserN54]

Those of you on 100% E85-is this normal?

I am running the newest Vishnu flex-fuel maps, and have all supporting mods, to include the LPFP. On cold starts I get long cranks, plus the engine does a pretty bad pop-pop-pop sound until I rev it, or the procede startsup, and then it is smooth. Like wise, despite all new plugs, coils, and front o2 sensors, I still occasionally get hestiations/shudders under WOT conditions in 5th-6th (sometimes 4th) gears, but not misfires as far as I can tell. (no codes, ses)

Can anyone chime in? Vishnu's not answering the phones these days....

[dx1541]

Get a JB4 ISO G5...
Seriously....

[Jeff@TopGearSolutions]

I dont want to be that guy but logs would maybe show you something. Are you supposed to be running 100% E85? I thought that was frowned up for this reason?

How cold is it by you? e85 tends to have some trouble starting when the fuel is cold.

Vishnu usually is open by 10AM PST. So they would just be opening now.

[enrita]

Normal especially with cold weather

[joec500]

Originally Posted by KaiserN54

Those of you on 100% E85-is this normal?

I am running the newest Vishnu flex-fuel maps, and have all supporting mods, to include the LPFP. On cold starts I get long cranks, plus the engine does a pretty bad pop-pop-pop sound until I rev it, or the procede startsup, and then it is smooth. Like wise, despite all new plugs, coils, and front o2 sensors, I still occasionally get hestiations/shudders under WOT conditions in 5th-6th (sometimes 4th) gears, but not misfires as far as I can tell. (no codes, ses)

Can anyone chime in? Vishnu's not answering the phones these days....

The cold start situation is normal depending on the temp.

The hesitations and shudders could be many things, need logs

[Dmacc]

Originally Posted by dx1541

Get a JB4 ISO G5...
Seriously....

lol!


OP what plugs are you running? When was your last valve blasting? I had these similar pops and unsteady idle on straight e85 as well as pump gas. Does this only happen to you on straight e85? Or is there a similar effect happening on pump gas as well?

[Dmacc]

Originally Posted by Jeff@TopGearSolutions

I dont want to be that guy but logs would maybe show you something. Are you supposed to be running 100% E85? I thought that was frowned up for this reason?

How cold is it by you? e85 tends to have some trouble starting when the fuel is cold.

Vishnu usually is open by 10AM PST. So they would just be opening now.

The cold fuel could definitely be the issue depending on what the temps are like where the OP lives, but running straight e85 with the new maps shouldn't be an issue, the cold start tables have been modified to deal with the fuel AFAIK.

[KaiserN54]

Originally Posted by Dmacc

The cold fuel could definitely be the issue depending on what the temps are like where the OP lives, but running straight e85 with the new maps shouldn't be an issue, the cold start tables have been modified to deal with the fuel AFAIK.

Right, my thoughts exactly. I am running OEM plugs with 3-4k on them. Walnut blasting was done last year, about 18-19k ago. Im in northern Ohio, this morning it was 48F, and it is only going to get colder from here. The problem with logging things is that the the shudder is so inconsistent- its hard to know just when to log.

[Mike@N54Tuning.com]

All you can do is adjust the global fuel scalars. If those don't help then you'll just have to live with it until more flash side tables are found.

Mike

[joec500]

Originally Posted by KaiserN54

Those of you on 100% E85-is this normal?

I am running the newest Vishnu flex-fuel maps, and have all supporting mods, to include the LPFP. On cold starts I get long cranks, plus the engine does a pretty bad pop-pop-pop sound until I rev it, or the procede startsup, and then it is smooth. Like wise, despite all new plugs, coils, and front o2 sensors, I still occasionally get hestiations/shudders under WOT conditions in 5th-6th (sometimes 4th) gears, but not misfires as far as I can tell. (no codes, ses)

Can anyone chime in? Vishnu's not answering the phones these days....

One more thing around hesitation and stutter at WOT, the car is making so much more power that Traction Control interferes quite a bit more cutting throttle, try completely turning off the Traction Control.

[Tony@vargasturbotech]

FWIW we have been running straight E85 in our shop car on flash only for the past 2 weeks, this includes OTS maps, custom maps, and I even flashed it back to stock for a few hours with E85 in the tank to get it leaned out to pass smog. Its been about 50 in the am here and have seen no long cranks or cold start issues. I agree cold E85 temps can cause this, but it very well could be something else. Logs should help people diagnose

[JO3]

I have this problem too with cold starts and 100% e85. Once the Procede initializes (does the map display) it's fine. I usually just rev to 1.5k rpm until then.

I tried a tank of 91, and the problem went away completely, so I figured it was just the e85, and I didn't worry about it.

[TT-Tom]

Originally Posted by KaiserN54

Those of you on 100% E85-is this normal?

I am running the newest Vishnu flex-fuel maps, and have all supporting mods, to include the LPFP. On cold starts I get long cranks, plus the engine does a pretty bad pop-pop-pop sound until I rev it, or the procede startsup, and then it is smooth. Like wise, despite all new plugs, coils, and front o2 sensors, I still occasionally get hestiations/shudders under WOT conditions in 5th-6th (sometimes 4th) gears, but not misfires as far as I can tell. (no codes, ses)

Can anyone chime in? Vishnu's not answering the phones these days....

The hesitations point to a fuel problem, when is the last time you logged your HPFP or injectors, to me that would be the first place to start. From there I would check valves, then reload your firmware and maps/ reflash your car using oft just to ensure the proper tuning file has been applied. I suppose I should make sure you did the flash required for this to work. Hope this helps.

[Presidio335xi]

Originally Posted by KaiserN54

Those of you on 100% E85-is this normal?

I am running the newest Vishnu flex-fuel maps, and have all supporting mods, to include the LPFP. On cold starts I get long cranks, plus the engine does a pretty bad pop-pop-pop sound until I rev it, or the procede startsup, and then it is smooth. Like wise, despite all new plugs, coils, and front o2 sensors, I still occasionally get hestiations/shudders under WOT conditions in 5th-6th (sometimes 4th) gears, but not misfires as far as I can tell. (no codes, ses)

Can anyone chime in? Vishnu's not answering the phones these days....

Been running 100% E85 for over a year. Originally my car wouldn't even start if temps were under 50 degrees.

Then I got an updated lpfp (Vishnu) and new fireware/maps. Along with walnut blasting and start ups are great.


Just give extra throttle until it smooths out, or add a gallon or two of 91/93oct.

[KaiserN54]

Originally Posted by Presidio335xi

Been running 100% E85 for over a year. Originally my car wouldn't even start if temps were under 50 degrees.

Then I got an updated lpfp (Vishnu) and new fireware/maps. Along with walnut blasting and start ups are great.


Just give extra throttle until it smooths out, or add a gallon or two of 91/93oct.

I took it to the dealer for an oil change and mentioned the misfire/hesitation while accelerating, and they offered to read the DME for me- came back with a misfire in bank one only. They believed it to be fuel related. Given that I have new plugs, coils, and 02 sensors, the recommendation was for new injectors. (six because of the new part numbers that recently came out.) Normally I would be suspicious of such a large job being recommended- but then the dealer said that while that is what I need, they refuse to do such work on a car that "has been modified to the extent yours has"- even though I would be paying out of pocket. So I have an appointment with another dealer. By the end of the week I will have new injectors, and a fresh walnut cleaning. That, along with my vishnu LPFP, and other new parts alrady in the car, should make for a (finally) healthy car.