studdering and almost stalls

**shady milkman** · 11-09-2009, 12:07 PM

howdy

so here is the deal...when my car (a4) is put into gear...the RPMs occasionally dip below 500 and the car sputters and almost dies. or when its just idling in park it will just briefly stumble a little bit as described above. This happens maybe 2-4 times a week...and when it shows these signs in idle when i put it in gear (usually reverse) it will do it too..but just that 1 instant...then its smooth sailing

so what do you think guys ? its sporadic and has me scratching my head

now that i think of it ...this might belong in the trans section possibly

sorry mods

**bills98ta** · 11-10-2009, 12:53 AM

That can be tuned in the idle section, where it say in park / in gear / with or with out AC ect... Might just need bumped up some, and you might want to crack open the TB plate a little. The idle control might be maxing out.
I guess I assumed you have HP Tuners ?

**shady milkman** · 11-10-2009, 05:16 AM

Originally Posted by bills98ta

That can be tuned in the idle section, where it say in park / in gear / with or with out AC ect... Might just need bumped up some, and you might want to crack open the TB plate a little. The idle control might be maxing out.
I guess I assumed you have HP Tuners ?

no i dont..but i do have frost doing the tuning. I was thinking today it could be throttle related. I was noticing when i bliped the throttle it would hold at 1k for about 1.5 seconds..then slowly drop down like normal...weirdness

**st_cspeer** · 11-10-2009, 06:26 AM

My car does the same thing, shop said part of it was the stall, Im still running stock, but plan on moving to a 3400 or 3600 soon. When mine does it it will actually kill the car in reverse.

**Hi-Po** · 11-10-2009, 10:16 PM

If you need a VCM flash, it will be free. Just thought I would let you know.

**shady milkman** · 11-11-2009, 04:55 AM

Originally Posted by Hi-Po

If you need a VCM flash, it will be free. Just thought I would let you know.

aww thanks ron

**shady milkman** · 11-11-2009, 04:57 AM

Originally Posted by st_cspeer

My car does the same thing, shop said part of it was the stall, Im still running stock, but plan on moving to a 3400 or 3600 soon. When mine does it it will actually kill the car in reverse.

wow that is weird..mine does it in reverse almost exclusively...fack...i hope its not my stall ...i would hate to have to dish out 800 bones on a stall right now....i need new rims and suspension first

**0rion** · 11-11-2009, 08:00 AM

what mods do you have shady? I forget. Sounds more like an air issue to me. Anything been done to the car lately in the throttle body/air intake area?

**Spaz** · 11-11-2009, 08:54 AM

is the car in open or closed loop when it happens???

**Danger731** · 11-11-2009, 09:00 AM

Don't forget the obvious - Fuel Pressure.

**shady milkman** · 11-11-2009, 09:05 AM

Originally Posted by 0rion

what mods do you have shady? I forget. Sounds more like an air issue to me. Anything been done to the car lately in the throttle body/air intake area?

full exhaust, intake mani and that is it. oh and egr! and air!

**shady milkman** · 11-11-2009, 09:06 AM

Originally Posted by Spaz

is the car in open or closed loop when it happens???

almost always before op temp..so open loop (correct)

**shady milkman** · 11-11-2009, 09:09 AM

Originally Posted by 0rion

what mods do you have shady? I forget. Sounds more like an air issue to me. Anything been done to the car lately in the throttle body/air intake area?

i am going to double check around my mani and TB ..but nothing has changed...i might clean my maf too

something else weird i have been noticing lately..is that my revs "hang" when i give it a blip..it will sit at that rpm for about 1 1/2 seconds so if i blip it up to 1.5ish ...it will jump to 1.5k then sit there for almost 2 seconds then slowly drop back to 600ish

i dont really notice a performance issue ..but its just something i would like to know the cause from ya know.

**shady milkman** · 11-11-2009, 09:09 AM

Originally Posted by Danger731

Don't forget the obvious - Fuel Pressure.

good call..didn't think about that.

**Spaz** · 11-11-2009, 09:44 AM

Originally Posted by shady milkman

almost always before op temp..so open loop (correct)

yes... closed loop is the after warm up cycle... that isn't uncommon in open loop when your PCM is searching the tables... frost could tell you far more than i could on it...

**Redphoenix1998** · 11-11-2009, 09:46 AM

I agree with Spaz

**Spaz** · 11-11-2009, 09:46 AM

could also be a spark plug... one car i looked at back in 99 had custom headers and had melted a plug wire...

**Redphoenix1998** · 11-11-2009, 09:49 AM

melted plug wires are common. Broken wires are also common. The type that you can't see where the carbon core is actually split.

**BANDITO** · 11-11-2009, 10:11 AM

Mine did the same and it was a wire. but also when I floored it it misfired in the upper rpms

**94ss06gxp** · 11-11-2009, 11:23 AM

jordon we need to make sure that you still do NOT have a vacuum leak still> since we never had issues before we got that LS6 intake mani on there. and fuel pressure would be a good check too (x2) .