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Discussion Starter · #1 ·
So randomly my car will start wanting to stall at idle and when coming to a stop in neutral, and then eventually(within 20-30 miles) will give me reduced engine performance and will idle at 600 and rise to 1000 then drop to 600, almost like when an old E30 has the idle air controller issue and just keeps rising and falling at idle, and it also sounds like it is misfiring on one cylinder when the reduced engine performance message is displayed. Turning the car off and on again fixes things completely, but this returns eventually. It will stall on cold starts too, is fine when warm, but after a long freeway trip it will barely idle after getting off the freeway. Everything is back to stock at this point. Any ideas?
 

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Re: Random reduced engine performance (sanatarium)

From what I have read about similar issues, it could be the fuel pressure controller or idle air controller...<p>Further reading on Idle air controllers reveals that issues with one will result in the engine 'not catching its idle when dropping RPMs and will drop to low speeds and jump to high speeds(1000) and slowly find its way to 700ish' Thats what mine is doing precisely.<BR><BR>
<i>Modified by sanatarium at 11:32 PM 5-26-2009</i>
 

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Re: Random reduced engine performance (sanatarium)

Glad I could be of help. <IMG NAME="icon" SRC="http://********************/smile/emthup.gif" BORDER="0"> <p><br> <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/tongue.gif" BORDER="0">
 

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Re: Random reduced engine performance (sanatarium)

Sounds to me like the idle air controller. If you have a check engine light come on and stay on, scan it and it should be a Upper Limit Detection Fuel Rail code if it is the fuel pressure regulator which will also give a shudder/stall. The IAC will affect the car only when you dont accelerate (hence idle) and will give a low RPM that keeps dropping when the car is cold and a high RPM when the car has been driven for a while if memory serves me correct. Hope that helps.<br>Todd<BR><BR>
<i>Modified by Bigblk4 at 6:46 AM 5-27-2009</i>
 

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Re: Random reduced engine performance (Bigblk4)

Well, unfortunately no CELs have popped up yet, however there could be stored codes, I'll check those today. Hot starts also result in the car simply stalling at idle.
 

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Re: Random reduced engine performance (sanatarium)

Dude... Im glad my car isnt doing this. I would sh1t! I freak out when anything goes wacky on my car, I dont know how you are handling this! <p>Pull those codes and see what we can figure out!
 

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Re: Random reduced engine performance (sanatarium)

Quick question. Does the car hesitate, buck then dip in RPM then die or does the RPM bounce high to low like it is searching for the right RPM to sit at? I know Rosa's SAAB had a stall issue when she drove the car, my S40 only stalled during sitting at a light or first starting up. With mine the fuel rail pressure sensor was the culprit. Didnt know it was the issue until it popped a CEL and I scanned it. Part is around $140 and install was around the same (I didnt want to screw with pressurized fuel rails). <br>Todd
 

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Re: Random reduced engine performance (sanatarium)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>sanatarium</b> »</i></TD></TR><TR><TD CLASS="quote"> Any ideas?</TD></TR></TABLE><br>Yes, you need a VIDA DTC scan which will rapidly tell you what's wrong. If you're impatient, try a generic code scan, but don't expect an accurate diagnosis - a generic scan might not pull a code at all.<p>Tom.
 
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