[SPC LV]

A little history first.

Anytime I tried a low rpm pull (say from about 40mph in 4th gear) my car would stumle and hiccup. It was kind of like pull, hicup, pull pull, hicup and so on. I took the procede out and couldnt replicate the problem. Put the procede back in and the car seemed to run fine.

The other day I was at a stop light and my car started misfiring. I turned it off and then back on and it was fine. I did a hard pull and it started misfiring again. Turned it off again and back on. Car ran fine as long as I kept it out of boost and after about 10 minutes went into limp mode and the CEL came on.

Took procede out and took the car in, ended up being the HPFP. I figured cool that must have been the problem all along with the stumbeling.

I picked up my car and everything seemed fine until I did my 4th gear at 40mph test. Once again the car was like pull, hicup, pull hicup. Keep in mind that the procede was not in I was running stock. No CEL either.

I made an appointment to take it back in but after I got some gas the car seemed to run better so I thought about canceling the appointment because I figured it was bad gas.

Today I did my 4th gear at 40mph again and sometimes it was smooth and sometimes it was back to stumbeling. So my dilemma is that I don't know if the techs are going to be able to reproduce the problem. I can see them telling me that they could not find anything wrong.

What do you guys think this is??
The standard bad gas answer?? If so, everyone must have bad gas arond here. I've tried multiple gas stations and brands. Any recommendations? Any help is appreciated.

[Noize]

Do you have a boost gauge?

[335iheLLraiseR]

what kind of gas are you using?

[SPC LV]

Originally Posted by Noize

Do you have a boost gauge?

I don't have a boost gauge.

[SPC LV]

Originally Posted by 335iheLLraiseR

what kind of gas are you using?

At first I was using Shell 93 because everyone seemed to be in agreement that it was the best.

Then I tried BP 93 which seemed to be working because for a span of about a month everything was fine and then went back to stumbling again.

Tried Sunnoco 93, same problem.

That's it.

[e.n335]

Reset the ECU and try again ( stock ).

- Eugen

[Jonmartin]

I'm having the same problem for about 3 weeks now. I just took the Procede out I figure it's the fuel pump too except even when I'm driving hard I don't notice a problem even though my gauge cluster is lit up like a christmas tree. I have the "BRAKE" , "SERVICE ENGINE SOON" & occasionally the half engine symbol reduced power engine malfunction only weird problem is it's not reduced power feels the same but at a light my car misfires mad... I'm taking it in come morning.

[per]

My car is in for a similar problem, i will give you a report as soon as i know.
They have tested the ignitation, no problem.
Now they are working on the fuel delivery.

[Former_Boosted_IS]

Originally Posted by Jonmartin

I'm having the same problem for about 3 weeks now. I just took the Procede out I figure it's the fuel pump too except even when I'm driving hard I don't notice a problem even though my gauge cluster is lit up like a christmas tree. I have the "BRAKE" , "SERVICE ENGINE SOON" & occasionally the half engine symbol reduced power engine malfunction only weird problem is it's not reduced power feels the same but at a light my car misfires mad... I'm taking it in come morning.

That really sounds like the ecu is detecting consecutive misfires and therefore throwing both lights. Have you had the CELs checked? What codes are they? I would guess you are running rich to the point that it is causing misfires. Have you looked at any of your plugs?

[DrDomer]

What version of software are you running? You might need the lower boost map. I occ run into this if accelerating hard from 2000 rpm in 4th-6th.

[pikkashoe]

LOL this is just your procede v2.0. I am experiencing the same exact thing in 4th gear, the hesitation/stutters. Map 2.0.2 should resolve this immediately. You do have procede, but you dont mention which version. If you have 2.0, then thats the answer, anything else, then I dont know.

[SPC LV]

Originally Posted by pikkashoe

LOL this is just your procede v2.0. I am experiencing the same exact thing in 4th gear, the hesitation/stutters. Map 2.0.2 should resolve this immediately. You do have procede, but you dont mention which version. If you have 2.0, then thats the answer, anything else, then I dont know.

I've got version 1.47. Still waiting on v2. Keep in mind the car was doing it completely stock also just not as bad.

If anyone figures this out, keep us posted.

[Terry335]

Originally Posted by SPC LV

A little history first.

Anytime I tried a low rpm pull (say from about 40mph in 4th gear) my car would stumle and hiccup. It was kind of like pull, hicup, pull pull, hicup and so on. I took the procede out and couldnt replicate the problem. Put the procede back in and the car seemed to run fine.

The other day I was at a stop light and my car started misfiring. I turned it off and then back on and it was fine. I did a hard pull and it started misfiring again. Turned it off again and back on. Car ran fine as long as I kept it out of boost and after about 10 minutes went into limp mode and the CEL came on.

Took procede out and took the car in, ended up being the HPFP. I figured cool that must have been the problem all along with the stumbeling.

I picked up my car and everything seemed fine until I did my 4th gear at 40mph test. Once again the car was like pull, hicup, pull hicup. Keep in mind that the procede was not in I was running stock. No CEL either.

I made an appointment to take it back in but after I got some gas the car seemed to run better so I thought about canceling the appointment because I figured it was bad gas.

Today I did my 4th gear at 40mph again and sometimes it was smooth and sometimes it was back to stumbeling. So my dilemma is that I don't know if the techs are going to be able to reproduce the problem. I can see them telling me that they could not find anything wrong.

What do you guys think this is??
The standard bad gas answer?? If so, everyone must have bad gas arond here. I've tried multiple gas stations and brands. Any recommendations? Any help is appreciated.

Sounds like a coil problem?

[Kbueno]

I bet it's the pump again. Have them check it out again.

[ontopofm]

I experienced multiple hiccups this afternoon as well, in 4th and 6th gear at about 80 mph. I was driving about 65mph, down shifted to 4th to pass, hiccups came on for like 2 sec, then hiccups again in 6th at around 80mph..., I could feel vibrations on the gas pedal....currently have v2.0.1 with default settings

[BMWdmk]

my 335i
does the pull, pull, hiccup, hiccup symptom too
but only between 3k-5kRPM

anybody else the same?

[SPC LV]

Originally Posted by ontopofm

I experienced multiple hiccups this afternoon as well, in 4th and 6th gear at about 80 mph. I was driving about 65mph, down shifted to 4th to pass, hiccups came on for like 2 sec, then hiccups again in 6th at around 80mph..., I could feel vibrations on the gas pedal....currently have v2.0.1 with default settings

Yep I feel it in the gas pedal too. It's really getting old man. I wish someone could figure this out already. I've had the procede out for about 3 weeks now and except for the first few days my car has been fine. I just can't believe that more people are not experiencing this issue since the maps are the same.

Although I'm sure that Vishnu has done testing for all sort of different conditions, maybe they should do some hard pulls in 4th gear from 40mph and see if they can replicate this problem and log it to see what's going on. Hint hint. Until then I'll wait for v2 to come in before I put the procede back in my car and see what happens.

[DK_12]

I'm almost sure that I'm experiencing the same problem as you guys. When I try to pull really hard from around 1-2k RPM, the car begins to jerk for a second till the boost seems to kick in and begins running smoothly. However one day the problem disappeared and never experienced the jerking or lag. Apparently the problem wasn't completely fixed because just this evening as I tried to punch it from 2nd gear in around 2k RPM, the car went into LIMP mode without any apparent overheating. Luckily I was almost home but the car began shaking pretty badly and I barely made it up the driveway. I thought the car was going to shut off and collapse. I guess it's time to see the dealer. BTW, I've never had any ECU mods so I don't think it's the PROcede that's causing the problem.

[stillclaimndp]

if it is happening without procede in, i am pretty sure it would be O2 sensor or fuel pump~

[TurboBullett@Ambient Thermal Management]

I have some theories that its the DBW throttle valve opening and closing at near idle conditions. I will be doing some datalogging to test this theory. On the Audi's we had to do throttle aligments with our Vag-Com computers to get the DBW to adapt correctly I'm wondering if this is the case on the BMW

[per]

I have similar problems as you have, the car runs fine when motor is cold, but when it gets warm,i get hiccups and stuttering from 2000-4000rpm.My car i by the dealer right know and tests has shown that the fuelpump pressure is 20% to low. I am vaiting for a new fuelpump right now.

[Bimmer335i07]

I had the EXACT same problem that you are having when I first installed the JBS2, with the car feeling like it will hiccup and then go and then hiccup and stuff like that. And with Terry's help, I found out that it was a bad connector pin. The pin actually came off, but it didn't always throw a code or hiccup because it was held together by the electrical tape.

I know that you have the PROcede, but I'm sure that it still uses the same type of plug and play, meaning you unplug one wire from the DME plug another wire from the PROcede into the DME and plug the DME wire into the PROcede wire.

Now, I'm not sure if this is the problem, but I would undo the electrical tape or whatever you use to secure the wires and check there first.

GL! Hope this helps.