What is going on????

[lokalmotive]

My car is acting crazy right now. Around 3500 RPM under moderate to heavy acceleration it cuts out. It seems to me to be some kind of fuel problem but I can't figure it out completely. Am I just in need of some sort of fuel management or EMS system with my mods (listed in sig) or could it be something else?

 

[B1GHAM]

how cold is it where you are @? also... am I to understand you are NOT running the MBC ATM?

sounds like you are hitting fuel cut and it is very likely to be normal if it is very cold out. are there any CELs associated to the issue you are having, or is it just cutting?

 

[lokalmotive]

how cold is it where you are @? also... am I to understand you are NOT running the MBC ATM?

sounds like you are hitting fuel cut and it is very likely to be normal if it is very cold out. are there any CELs associated to the issue you are having, or is it just cutting?

As far as temperature we're talkin 30's at the lowest and that's only been once or twice in the morning. Normal temp is ranging from 45-60. I'm not running the MBC right now b/c I haven't ordered my boost gauge or gauge pod yet. I do have a CEL from the Catless Midpipe but it goes on and off and random intervals. My car cuts either way, with the light on or off. I know it sounds like fuel cut but I'm trying to figure out why it's doing it and how to fix it. If fuel manangement or EMS is my only solution then I'm prepared to spend the money. Just trying to get some other opinions since I'm not modded heavily or anything.

 

[GreySpeed]

search for wastegate actuator, sounds like the problem to me. Lots of people including myself had this problem.

 

[lokalmotive]

search for wastegate actuator, sounds like the problem to me. Lots of people including myself had this problem.

Let's assume this is my problem (which I'd be more than willing to at the price of a $60 replacement part). What is the tell tale sign by looking at the peice? Or is there actually any way to tell just by looking?

 

[B1GHAM]

Let's assume this is my problem (which I'd be more than willing to at the price of a $60 replacement part). What is the tell tale sign by looking at the peice? Or is there actually any way to tell just by looking?

if it IS the wastegate one of the ways to tell is by removing the vac line going to the wastegate and blowing into it. air should not be able to pass through.

 

[03MSP]

By cut out do you mean it's like hitting a brick wall? If so I'd second the wastegate actuator idea, at those temps it's hard to believe that stock boost would hit fuel cut.

 

[SeR_Cyclops]

this happend to me and i looked and somone had the vac lines hooked up on my car wrong too me forever to get it fixed (stupid people before me grrrr)
and i replaced the wga b/c it was bad too. i got an atp 6 psi

 

[lokalmotive]

By cut out do you mean it's like hitting a brick wall? If so I'd second the wastegate actuator idea, at those temps it's hard to believe that stock boost would hit fuel cut.

This is exactly what I mean. It's like the engine dies and then cuts back on. It's wild. I'm going to order a new WGA and see if this doesn't fix the problem. Because it's like you're saying the temps here aren't abnormally low by any means. It never gets cold enough to snow and if it is cold it's just in the morning and because of the wind during the day.

 

[metallargy]

Is it in all gears?

Can you romp on it from 1st and it cuts @ 3500?
Or is it just when you're transitioning from cruising speed?

 

[lokalmotive]

Is it in all gears?

Can you romp on it from 1st and it cuts @ 3500?
Or is it just when you're transitioning from cruising speed?

Yeah it happens in all the gears all the time. It's always between 3000-4000.

 

[Run for Cover]

hard to install a wga?

 

[MrDiggler]

I have a similar problem with moderate (not full) throttle under steady load between 3500-4000k rpms. I've decided it's a lean condition caused by some decent boost (5-6+ psi) and just light enough throttle to keep from triggering open loop and the extra fuel dump. The hesitation is harsh and pretty much stalls the engine. As soon as I sense it coming, I either back out of the gas or give it enough to go open loop and dump extra fuel. This should be fixed when I go with an EMS.

 

[tehturbo]

Can't he just get it reflashed? Mine is going in tomorrow for the TSB reflash so I can get rid of that damn surging.

 

[Spoolin4]

I had a problem like that. I was only running 10 lbs with a FMU and alot of times in 1st and 4th gear at like 5000 rpms it would just stall for a second or two and then take off haulin' ass again. I never got it fixed i blew the motor.

 

[MrDiggler]

Yep, better to go rich than to go lean. Especially on a stock FS motor.

 

[fr0st]

uuuh, just to point out fuel cut on stock boost,

i got mine up to around 130 MPH and it was like -20 degrees f outside... never hit anything exept at around 130 when it just cut out in fifth gear... which is speed governer i believe..

so fuel cut at low temp is very unlikely... more of a WGA problem.

 

[Spoolin4]

uuuh, just to point out fuel cut on stock boost,

i got mine up to around 130 MPH and it was like -20 degrees f outside... never hit anything exept at around 130 when it just cut out in fifth gear... which is speed governer i believe..

so fuel cut at low temp is very unlikely... more of a WGA problem.

I really don't want to sound like a dumbass, but I had an electronic speedo in my car which was detuned from hell and I was on interstate I81 one day and was reading out 157 on the speedo? 12lbs of boost. Either me being detuned did it or my speedo was off. All i know is a saw green blurrs from the tree's and thats it.

 

[sandspeed]

get some sort of ems or an afc to control the afr's better. The stock ecu isn't very reliable and your temps are pretty cold too. There might be some crazy spiking if the wga is broken, so I would replace it.

 

[tehturbo]

Stock gearbox dies before 157, unless you are at like 7200 rpm.