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E46 idle . when giving it a little rev it comes back down a little pauses for a second then drops again

Posted by Anonymous on

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6ya6ya
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Posted on Jan 02, 2017

emissionwiz
  • 75797 Answers

SOURCE: idle irratic

Here are some of the causes 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 Apr 13, 2009

emissionwiz
  • 75797 Answers

SOURCE: revs drop coming to standstill

Here is the 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 12, 2009

  • 1071 Answers

SOURCE: Integra revs RPMs when idling

idle air control motor or just a plain old vacuum leak

Posted on Jul 21, 2009

  • 1 Answer

SOURCE: 2002 Hyundai Elantra 100k miles - 2.0l - running rough

When I had this same problem...it was the Catalytic Converter...cost about 200 to get it fixed at the Hyundai Dearlership :)

Posted on Apr 01, 2010

  • 1619 Answers

SOURCE: hard starts, rough chugging idle, huge delay from

Sounds like ignition components may need replaced like the coils and wires.

Posted on Aug 15, 2010

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1 Answer

I have a 2001 Toyota Corolla. The revs fluctuate whilst idling.


could be a bad TPS or stuck, bad, dirty idle air control solenoid (IAC). check fuel pressure and check for vacuum leaks after the air flow sensor. more info is needed because what you describe could be many different things or a combo of different things

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I have a 99 gmc jimmy Ive notice while i slow down for a turn my car is still trying to accelerate and only when I come to a full stop it goes back to normal Also when first starting the car it revs up to...


Vacuum leak from brake booster. If you hear a sucking noise when you press the brake pedal replace it. Another way to check it is to place truck in gear set e-brake press brake pedal repeatedly and see if idle goes up and down. DO NOT PRESS GAS PEDAL DURING TEST.

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1998 Nissan 200sx won't rev past 4000 RPM in neutral. What's the cause?


STOP doing that, forget about it, your going to blow your engine !

Mar 06, 2013 | 1998 Nissan 200SX

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89 Chevy Sprint takes about 5 minutes to warm up to be able to drive away or it stalls when I give it gas. The engine will rev up for 3-4 seconds then drop down and almost stall and then rev again during...


Plug the vacuum line you unplugged and the idle should come back. Change your air filter and the map sensor. check for correct coolant level and replace the coolant temp. sensor. This sensor affects cold starting and idle through the ECU (open loop mode, rich fuel mapping and 1200 rpm idle) It should go to closed loop mode in the ECU once engine warm up is achieved ( lean fuel mapping and normal 900 rpm idle). Do not unplug anything else till you perform an OBDII scan of the stored fault history

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2002 Hyundai Elantra 100k miles - 2.0l - running rough


sounds like the throtle position sensor is miss alined or the idle screw is backed off

Dec 16, 2009 | Hyundai Motor 2002 Elantra

2 Answers

Ive a mx 5 mazda 1992 and ive got a problem with idle on tick over.


when my mazda mx5 is warmed up the engine idles at 800 revs after about 20 seconds the revs drop to 400 revs,after 5 seconds they pickup again to 800 revs,this pattern is continuous.HELP!!!!!

Nov 29, 2009 | 1992 Mazda MX-5

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Idled high, replace IAC and PCV, now idles low and stalls


May be a defective IAC, or bad connection, or improperly installed, as in lost little "O" ring when putting it on. I would also be looking at TP sensor, which I would have tested in the first place. Have you tried cycling your key to retrieve problem codes yourself? ( turn key to on,(not start) then off, then on, then off, then on again, and leave on, and count flashes of check engine light. It will flash quick, then pause, then flash again. For example: 3 flashes, pause, then 3 more is code 33. 2 flashes, pause, 5 more, is code 25. When you get 5, pause 5 more, that code 55, which means end of message. Write them down, and get back to us with what you have if any.

Nov 18, 2009 | 1989 Dodge Shadow

1 Answer

Evry time i come to a junction my car just cuts out nd the revs go up and down up and down on tick over so when i change gear the revs stay on for about 3 to 4 seconds then drop


Very common fault - idle air valve. There are two types, a 2 bolt or 3 bolt fixing. If you are in the UK give me your registration number and I will give you the part number.

Nov 18, 2009 | 1997 Ford Escort

1 Answer

My 1987 turbo toyota supra will only rev up to 2500 rpm then cut out like a governer. when it drops to about 2000 rpm it will rev back up only to 2500 rpm. at an idle it runs rough


The throttle position sensor has an idle switch in it that tells the car's computer that the throttle is positioned at idle. If the idle switch sticks in the idle position, the computer will not allow the engine to rev more than 2500 rpm. In your case, I think the switch is stuck.

First, see if you can get the trouble codes to come up. Rig a jumper wire and jump between the "T" terminal and the "E1" terminal in the car's "Diagnostics" box. It is a small black box on the driver's side of the engine compartment near the battery. Open the lid and on the inside of the lid it has a map of the terminals.

Once you hook up the jumper wire, turn the ignition switch to on but do not start the car. If there are codes, the check engine light (orange) will blink the 2 digit code. It blinks the first digit, pauses, then blinks the second digit. The code for the throttle position sensor is code "41". That is, four blinks...pause...then one blink. If this code comes up, change the throttle position sensor. (If there are no codes, the check engine light will steadily blink once per second until you turn the key to off.) Don't forget to remove the jumper wire when you are finished.

Apr 10, 2009 | Toyota Tundra Cars & Trucks

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