[boostaholic786]

I'm having an issue as soon as I installed my Walbro 465lph. On the stock pump I was running about 8.5 gallons of E85 and about 4.5 gallons of 93.. That said and after looking at logs, I needed a LPFP. The car was running like a bat out of hell and as soon as I put the walbro in, and I get on it over 30% throttle, it feels like the car is having a muscle spasm or a bucking, so to say of some sort. the car NEVER did this before I put the walbro in and would hold 18si throughout the rev range, no issues. When I get on it all of a sudden it feels like it hits a brick wall and then staying in the gas the rpm's rise really slow. The code i got was INJECTION CYLINDER SWITCH-OFF. Does anyone know what this means or what steps I need to take in order to fix the issue??? I havent seen this issue really ever and I flashed my car back to stock flash and its still having the same issues??? I'm running the JB4 G5 ISO and we have switched that out and I get the exact same issue with a completely different JB4 G5 ISO. We even swapped the fuel pump with Sammys fuel pump which has been working fine with NO issues so the fuel pump can be ruled out as well. Can anybody chime in on what injection cylinder switch-off means because it DOES NOT FEEL GOOD AT ALL!! I know someone here has had this issue so if you could please chime in, that would be awesome. We also changed plugs as well just to rule that out and the injectors didnt seem to have any funny smell??

[dx1541]

Log your hpfp. It may be taking a dive at wot. Had that earlier all out of a sudden and even though it showed lpfp going below 50 psi it was still fine for a while on e77 without an lpfp change.
Don't ask me why but the only way you're gonna get around it is to run less e85 , lean the mixture out. More to do with the hpfp can't taking high concentration of e85.
Log it. You'll soon see where the problem lies.

[zeel]

I had this issue and it was because one of the hoses popped off. Put on a better quality hose and never had it since.

[boostaholic786]

I did log it and right around 4100rpm's, LPFP takes a dive from 76-78 down to 40 or so and HPFP was at 7 or 9 if im not mistaken.... By the way, we have checked the hoses for the Walbro and everything is tight and is working properly. Its ONLY if I go WOT. If I go 30% throttle, it does not do it but as soon as I push the pedal a little more, all of a sudden it jerks and bucks and then I get that shaking when I push the throttle which is that INJECTION CYLINDER SWITCH-OFF, and have to go to menu 1-2 to delete it because it feels like im intentionally breaking my car. I just dont want to go start throwing money at the car like I already have I just have no idea why its doing this as soon as I put in that 465 walbro... We even swapped buckets with my buddy Sammy0559 since his car is going to be down for a while ( for good reasons ) and STILL SAME ISSUES. So we can rule out the Walbro LPFP. Has anyone seen a fuel regulator go out on these cars at all??? I havent heard nor seen anyone have this issue so I'm trying to rule things out, like I said, before I start throwing money at it. The HPFP IS making a ticking noise that doesnt sound to be normal at all. I have tried to figure out what INJECTION CYLINDER SWITCH-OFF means and what causes it???

[Stucks]

Originally Posted by zeel

I had this issue and it was because one of the hoses popped off. Put on a better quality hose and never had it since.

+1. I rode around in zeels car when this happened to him. hose had popped off. check your lines and if need be, upgrade the hose like he said.

[Ingeniator]

Originally Posted by boostaholic786

I did log it and right around 4100rpm's, LPFP takes a dive from 76-78 down to 40 or so and HPFP was at 7 or 9 if im not mistaken.... By the way, we have checked the hoses for the Walbro and everything is tight and is working properly. Its ONLY if I go WOT. If I go 30% throttle, it does not do it but as soon as I push the pedal a little more, all of a sudden it jerks and bucks and then I get that shaking when I push the throttle which is that INJECTION CYLINDER SWITCH-OFF, and have to go to menu 1-2 to delete it because it feels like im intentionally breaking my car. I just dont want to go start throwing money at the car like I already have I just have no idea why its doing this as soon as I put in that 465 walbro... We even swapped buckets with my buddy Sammy0559 since his car is going to be down for a while ( for good reasons ) and STILL SAME ISSUES. So we can rule out the Walbro LPFP. Has anyone seen a fuel regulator go out on these cars at all??? I havent heard nor seen anyone have this issue so I'm trying to rule things out, like I said, before I start throwing money at it. The HPFP IS making a ticking noise that doesnt sound to be normal at all. I have tried to figure out what INJECTION CYLINDER SWITCH-OFF means and what causes it???

Based on what you are saying. I think it is possibly your fuel control valve or High side fuel pressure sensor. I don't suspect that a sticking injector would dump that much fuel. I would try switching the high side sensor with a known good sensor and then do the HPFP if required as it is a non servicable unit I think.

[dx1541]

Originally Posted by boostaholic786

I did log it and right around 4100rpm's, LPFP takes a dive from 76-78 down to 40 or so and HPFP was at 7 or 9 if im not mistaken.... By the way, we have checked the hoses for the Walbro and everything is tight and is working properly. Its ONLY if I go WOT. If I go 30% throttle, it does not do it but as soon as I push the pedal a little more, all of a sudden it jerks and bucks and then I get that shaking when I push the throttle which is that INJECTION CYLINDER SWITCH-OFF, and have to go to menu 1-2 to delete it because it feels like im intentionally breaking my car. I just dont want to go start throwing money at the car like I already have I just have no idea why its doing this as soon as I put in that 465 walbro... We even swapped buckets with my buddy Sammy0559 since his car is going to be down for a while ( for good reasons ) and STILL SAME ISSUES. So we can rule out the Walbro LPFP. Has anyone seen a fuel regulator go out on these cars at all??? I havent heard nor seen anyone have this issue so I'm trying to rule things out, like I said, before I start throwing money at it. The HPFP IS making a ticking noise that doesnt sound to be normal at all. I have tried to figure out what INJECTION CYLINDER SWITCH-OFF means and what causes it???

Another possible problem i would concur as someone here has mentioned is the hpfp sensor located just below the intake manifold or rather at the hpfp unit. ( hpfp on it's way out possibly! ) Injection cylinder switch off which is a 29DC limp home code is being thrown as soon as the ecu detects hpfp is unable to cope with the fuel demands.( could be as result of insufficient or abrupt supply cut off from the lp side ) Yea it will buckle and stutter normally with a half engine code on the dash but goes away on auto clear on the jb4. But then again you seem to mention that the lpfp takes a dive suddenly ( or is it a progressive reduction? ) which could also point to an lpfp sensor since the problem came after you did the pump change. ( would be helpful to show us a pic graph of your logs as it happens )

[boostaholic786]

here are some logs. I have already replaced plugs, coils, all 02 sensors (which was a shit ton of money that didnt solve the problem and I honeslty
am so tired of dealing with this issue mentally and financially because every
dollar I spend DOESNT fix the issue....Please help guys I have no idea
why its doing this and it ONLY started this AFTER I installed the Walbro
465LPH E85 rated pump and we even double checked that in a buddies
car to see if it worked in his and sure enough, it did... So its not the
LPFP, not the 02's, not the coils, and I recently got new injectors i forgot to mention....

[boostaholic786]

Any Ideas Guys???

[boostaholic786]

Also this is with the BMS backend flash for E85 AT 50% or greater with the JB4 G5 ISO. Currently im running 9 gallons of E85/ 3.5 gallons of 93 and uploaded newest JB4 firmware and also restored defaults since I got the 465LPH walbro...I love this car more than anything and the second I put the walbro in, the hidden issues started to arise. I'm actually pretty concerned because for some reason the car behaves normal under 30% throttle input but after that it stutters and shutters. NO MISFIRES JUST: 29DC CYLINDER INJECTION SWITCH-OFF. Before I put the walbro in i ran about 8.0 gallons E85 and 4.5 gallons of 93 and the car ran like a bat out of hell. But I was maxing out fuel trims so got the walbro and now im scared to drive the damn car

[boostaholic786]

Here is 2 logs doing 30-40% throttle with no hiccups during that run and actually for the first time I took it to 7K rpm's and another run going WOT...anything over 40% throttle the car backfired and popped and got 29DC INJECTION CYLINDER SWITCH-OFF. Compare both and I cant seem to grasp why my car runs normal under 40% throttle but if I go WOT it is no bueno. check the logs out

[boostaholic786]

here is WOT

[OB]

datazap it

[dx1541]

Can you put in your fuel pressure for both low and high as well... you won't see anything if those are not looked at.

[dx1541]

And what are your fuel open loop set at on the JB4. Is it on auto learn or manual? I'll tell you why if you post up some logs of your fuel pressure later.

[dx1541]

Originally Posted by dx1541

Another possible problem i would concur as someone here has mentioned is the hpfp sensor located just below the intake manifold or rather at the hpfp unit. ( hpfp on it's way out possibly! ) Injection cylinder switch off which is a 29DC limp home code is being thrown as soon as the ecu detects hpfp is unable to cope with the fuel demands.( could be as result of insufficient or abrupt supply cut off from the lp side ) Yea it will buckle and stutter normally with a half engine code on the dash but goes away on auto clear on the jb4. But then again you seem to mention that the lpfp takes a dive suddenly ( or is it a progressive reduction? ) which could also point to an lpfp sensor since the problem came after you did the pump change. ( would be helpful to show us a pic graph of your logs as it happens )

Just to correct my earlier post , its NOT a LPFP sensor below the intake manifold if it doesn't throw a 29F3 code. Cause that just happened to me 2 days ago and it went away as soon as I replaced the sensor.

29DC is another problem altogether and has to do with fuel pressure AND the fuel open loop values.

[boostaholic786]

open loop is set at 80. I did restore defaults and it put it down to 40 but did the exact same thing. I'm trying to find a way to put the csv logs on here but dont know how. any help would be great

[boostaholic786]

http://www.sendspace.com/file/1bn6uo

http://www.sendspace.com/file/tvwz5c

http://www.sendspace.com/file/1ej4kv

Got the CSV's loaded so any help is appreciated guys. I have spent an arm and a leg already and bought new 02's, crankshaft position sensor, plugs, coils, injectors and i cant even remember what else. PLEASE HELP GUYS!!!!

[boostaholic786]

dont download anything except (Click here to start download from send******* but only download the csv's not any of the ilividsetup stuff.

[Mit_Boost]

Is it doing this on straight Pump Gas? Or just Ethanol Blends?

[dx1541]

Originally Posted by boostaholic786

open loop is set at 80. I did restore defaults and it put it down to 40 but did the exact same thing. I'm trying to find a way to put the csv logs on here but dont know how. any help would be great

Can't see your logs but am sure you will notice your hpfp taking a dive plus running an OL value of anything above 60 is not gonna work. Mine settled on 52 and runs map 5 ok , occasional map 7 but won't do it consistently. Running E60.

[dx1541]

When was the last time you ever replaced the hpfp?