Question about Dodge Neon

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Idle drops lower then normal when i come to a stop but only sometimes

It runs a little rough so i put it in neutral and back to drive and the idle returns to normal. Its not every time i stop only 1/2 the times

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  • Expert
  • 338 Answers

I would check the Idle Control Valve on the throttle body.

Posted on Feb 17, 2012

6 Suggested Answers

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Posted on Jan 02, 2017

GregV24CHOPP
  • 11 Answers

SOURCE: when cold, it idles rough, revs high then low! After warmed up it runs fine

if it runs high when you first start it then mellows out,, theirs no problem , all of our chevys do that.... but if its sputtering or you hear a quiet popping noise check spark plugs

Posted on May 20, 2009

emissionwiz
  • 75005 Answers

SOURCE: 98 GMC k2500 7.4L Rouch Idle

TRY THIS BEFORE U SPEND ANYMORE MONEY N PARTS.
Here is the common cause of surges, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake

Posted on May 22, 2009

saabreur
  • 51 Answers

SOURCE: rough idle on 1990 saab 900 convertible, 16V

Because the car has adaptive technology, it may take a while to reset and adjust to the new, cleaner and better conditions than those to which it had previously adapted.

Did you change the cap and rotor? if the plugs needed replacement, likely they do too

Possible other causes include:

loose or corroded connections to any electrical component you disturbed (make a checklist and tick them all off as you check them);

mis-reinstallation of any F.I. part disturbed(checklist again)

obstructed water flow through the AIC valve;

improper voltage output from the AIC valve (for LH 2.4 systems, should output 8 volt at idle, dropping as load increases; for LH 2.4.2 system output 7 volt at idle etc; testing between terminals)33 and 17 at disconnected LH connector;

possible problem with MAF.

Hope this helps

Saabreur







Posted on May 30, 2009

greg_margo
  • 1959 Answers

SOURCE: when a/c is turned on idles rough and rpms drop

It's possibly the TPS (Throttle Position Sensor). The TPS controls the throttle in different conditions i.e. cold,warm, AC operation. It could be the TPS isn't idling fast enough when you operate the AC.

Posted on Jun 30, 2009

  • 583 Answers

SOURCE: Rough low idle in gear when stopped at a light.

probable vacuum leak query brake booster

Posted on Jul 26, 2009

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2 Answers

Car runs smooth, until I have to stop at red light or stop sign, then it runs rough. When I put it it neutral, it runs smooth. Could that be the EGR valve sticking? Any help would be appreciated, than


Depends on what you mean by rough. Could be a cylinder misfire.They sometimes are not noticed as engine speed increases during driving or under light load as when idling in neutral but at idle under load as when stopped at a light in drive became noticable.
Could also be running rich. The causes of either are too numurous to list.Consult a good mechanic who can actually see and hear the problem to put you on the right track.

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Without more info it might be hard to figure this one out. I would start by replacing the Idle Air Solenoid. Also check to see if the EGR valve is open.

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To test this, locate the 2 or 3 wire connector on the left side of the transmission (looking at it from the left side of the car, it can be hard to find some times) Disconnect it. If the car runs and drives ok with it unplugged, the Lock Up Solenoid has gone bad. The solenoid itself is inside the valve body, inside the transmission (above the transmission pan)

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