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Why does my car surge in traffic?

2005 MPV - was having rough idle - changed air filter, IAC and cleaned throttle body and mass airflow sensor. Better, but now when I stop in traffic the car surges (RPMs jack up to 3000 when I apply brake). After a few seconds then go back to normal (800RPM). Why?

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Throttle position sensor.

Posted on May 13, 2014

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2009 Camry 5 Speed Manual trans. Has a rough, low idle below 500 RPM whats the cause?


Clean the throttle body bore and plate of any carbon deposits. Also, clean and check the IAC idle air control circuit . If it has electronic controlled throttle body it will not have the IAC. Carbon deposits around the throttle body bore and plate (butterfly) can restrict airflow at idle causing the low uneven idle.

Nov 16, 2015 | 2009 Toyota Camry

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Does my corsica have a mass airflow sensor?


Hi, is your air filter clean,any trouble codes,throttle body clean,idle air control passage clear,idle air control module.

Dec 05, 2014 | Chevrolet Corsica Cars & Trucks

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What would cause a 2002 Tahoe to die when you let off the throttle?


1) Bad/clogged Idle Air Control (IAC) especially if you have a oil and gauss air filter.
2) Air leak in the duct between the air filter and Throttle body.
3) Bad or clogged Mass Airflow Sensor (MAF).
4) Bad Throttle Position Sensor (TPS).
If no throttle cable the throttle body assembly..

Sep 30, 2014 | 2002 Chevrolet Tahoe

1 Answer

Why is my idle so high when I stop in traffic?


Sometimes cleaning all that stuff can remove years of accumulated junk in small pasageways, especially around the butterfly vavle in the throttle body. This in turn allows more air into the motor than it's used to. Much like having the throttle part way open. Most newer vehicles have a learning mode. You can try unplugging your battery and letting it sit for an hour and then connect it back. This should clear the ECU memory, and the vehicle will have to go throught the learn function again. When you start the car and let it idle, DO NOT run the A/C or lights, or defroster, or anything that may put extra drain on the motor. The computer needs to establish a baseline for idle, so let it just sit and idle for a few minutes. See if that helps with the idle issue.
My wife's 06 Pathfinder started acting up after I wiped out the junk in the throttle body. It kept giving an error causing the check-engine light to come on. I would clear it and it would come back on in a day or two. After a week or so, it finally stopped coming in.

May 12, 2014 | Vehicle Parts & Accessories

4 Answers

P0101 code for check engine light.. possible solutions???


Diagnostic Test Code (DTC) P0101 has a generic description of "Mass or volume air flow circuit range/performance problem". This can be caused by several things including:
> Dirty air filter
> Air leak in air intake system
> Contaminated, deterriorated or damaged Mass Air Flow Sensor
> Poor electrical connections at the Engine Control Module, the Mass Air Flow (MAF) sensor or the Throttle Position Sensor (TPS)
> Faulty MAF or TPS

You should check your air filter and air intake system visually and correct any obvious defects/leaks first.

If a visual inspection does not turn up the cause, then you will need a scan tool capable of reading sensor data to verify the function of the MAF and TPS. You will also need proper electrical diagnostic equipment to verify the integrity of the circuits and continue with diagnosis.

Sep 11, 2011 | 2005 Kia Rio

3 Answers

2003chevy pu dies at stop lights, low idle whats wrong?


yea id definately try cleaning ur throttle body 1st. My 03 1500hd had the exact same bad idle after my battery went bad it would die at lights unless i kept foot on gas i cleaned throttle body runs perfect now took 30min cost 8$ for cleaner at autozone and theres how to videos on you tube

Aug 13, 2011 | 2003 Chevrolet Silverado 1500

1 Answer

I recently had problems with my 2005 Mazda MPV stalling. I came to this great site and changed the IAC and it stopped stalling. But 2 days later my check engine light came on. The codes are P2197 P2195...


The descriptions for your codes are:
P2197 - H02S (RF) signal stuck lean
P2195 - H02S (RF) signal stuck lean
P2187 - Fuel System too lean at idle
P0102 - MAF circuit low input

Essentially what's happening is that your MPV is running too lean when at idle. Too much air and not enough fuel. As you speed up - it forces more air into the system which alleviates the problem.

Examine your mass airflow sensor. It should be completely clean - no fuzzies on it at all. If so - purchase some mass airflow sensor cleaner to clean the sensor. ONLY USE THE PROPER CLEANER TO AVOID DAMAGING THE SENSOR. Disconnect the battery to reset the system and turn off check engine light.

Otherwise you will need a scan tool to look at the voltages being supplied to/from the PCM for each of the Heated Oxygen Sensors and the Mass Airflow Sensor to determine which part is creating the problem.

May 25, 2011 | 2005 Mazda MPV

1 Answer

1997 ford truck will start wont hold idle


I would start with checking the IAC ( Idle Air Control ) on the back of the throttle body. This provides air to the throttle body when the butterfly is closed ( idle ). Some times they build up gunk in there, and the valve cannot work correctly.

The IAC is on the back of the throttle body, you will need to remove the plastic throttle body cover to get to it.
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There are 2; 8 mm ( 9 ? ) bolts holding this on to the throttel body, remove the bolts, and unplug the connector and the tube. Spray the IAC with throttle body cleaner that is MAFS ( Mass AirFlow Sensor ) safe a few times until the clear runs clean. Let dry and reinstall. Might need to be repalced, but worth checking on cleaning 1st.

Jan 17, 2010 | 1997 Ford F150 Regular Cab

1 Answer

Why is my grand 2004 grand cherochee idoling rough


The idle air control valve (IAC) may be stuck or failing. This solenoid-type device controls the airflow into the engine at idle. It is fed control input signals from the engine's computer. Over time, the IAC valve may become dirty from EGR gases and carbon, etc. It may have a worn pintle (valve head) or the return spring may be weak or broken, causing a rough idle or even stalling from an over-rich fuel/air mixture. The second thing to have checked is the throttle position sensor.TPS. These devices will "flag" a fault on your vehicle's onboard OBD-II computer, which a decent code reader/scanner can display and clear. Third, a dirty throttle body housing/venturi can cause rough idling and poor response. A special cleaner is needed to remove oil and carbon residues from the specially-coated inner surfaces of the throttle body. Fourth; you may have a Mass Airflow Sensor (MAF) that might be failing/malfunctioning. Some vehicles use these instead of the Manifold Absolute Pressure (MAP) Sensor, which you may have. These sensors need to be checked and verified that they are functioning properly. Fifth; check/change your vehicle's fuel filter, and verify proper/adequate fuel pump pressure and flow performance. Don't run your vehicle below 1/4 tank of fuel...doing this sharply reduces the life and cooling of the in-tank electric fuel pump. These are not cheap, or easy to replace!

Aug 31, 2009 | 2004 Jeep Grand Cherokee

1 Answer

Same problem in a 2004 MPV


Hi there im in australia and i have come across a few mazdas not just the mPV that have this same problem. if it was the air flow meter you would be able to accelerate as the computer wouldnt pickup that more air is entering the engine therefore it wouldnt compensate with fuel! try disconnecting the battery with the negative terminal for 60 seconds. if that dosnt work try cleaning the throttle body and IAC and get someone with a decent scantool to reset the idle. Hope this Helps. Regards Ben

Aug 05, 2009 | 2003 Mazda MPV

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