Question about 1999 Volkswagen Golf

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My toledo v5 has a jumpy idle ive changed maf sensor cleaned throttle body changed engine temp sender still no luck jumps between 600-1200 rpm on idle never stalls thanks for any help

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Do you perhaps have a small exhaust leak? Check ahead of the O2 sensor. If the exhaust can **** fresh air in it can't give the computer an accurate reading and the engine will rev up and down at idle. Hope this helps.

Posted on May 09, 2010


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What is a solution to fixing the mass air flow system, with code po121

DTC P0121: Throttle Position (TP) Sensor 1 Performance
Circuit/System Description
The engine control module (ECM) uses the following information to calculate an expected airflow rate:
The throttle position (TP)

The barometric pressure (BARO)

The manifold absolute pressure (MAP)

The intake air temperature (IAT)

The engine RPM

P0121 The predicted air flow and the predicted MAP combined are outside a calibrated range for more than 3 seconds.
Circuit/System Testing

  1. Inspect for the following conditions:
  2. ?€¢
    Vacuum hoses for splits, kinks, and proper connections as shown on Vehicle Emission Control Information label

    Inspect thoroughly for any type of leak or restriction

    Air leaks at throttle body mounting area and intake manifold sealing surfaces

    Throttle body for dirt, debris, and coking--Refer to Throttle Body Cleaning.

  3. Allow the engine to reach operating temperature. Observe the MAP Sensor Voltage parameter with a scan tool. Voltage should be more than 0.8 volt and less than 4 volts.
  4. ?‡'
    If more than 4 volts or less than 0.8 volt, refer to DTC P0106.

  5. Idle the engine. Observe the MAP Sensor kPa parameter with a scan tool. Increase the engine speed slowly and then back to idle. The MAP sensor kPa should change smoothly and gradually as engine speed is increased and returned to idle.
  6. ?‡'
    If the MAP sensor kPa does not change, refer to DTC P0106.

  7. Take a snapshot of the engine data list while performing the actions listed below. The mass air flow (MAF) sensor g/s should change smoothly and gradually as the engine speed is increased and is returned to idle.
  8. ?€¢
    Idle the engine.

    Increase the engine speed slowly to 3,000 RPM, then back to idle.

    Exit from the snapshot and review the data.

    Observe the Mass Air Flow (MAF) Sensor parameter frame by frame with a scan tool. The MAF sensor g/s should change smoothly and gradually as the engine speed is increased and is returned to idle.

    If the MAF sensor g/s does not change smoothly and gradually as the engine speed is increased and is returned to idle, refer to DTC P0101 or P1101.

  9. Inspect the throttle body for the following conditions:
Loose or damaged throttle blade

Broken throttle shaft

Any throttle body damage

If any of these conditions exist, replace the throttle body assembly.

Jun 20, 2015 | 2008 GMC Sierra 1500 2WD

1 Answer

Engine wont idle

Change the air filter if needed, clean the mass air flow sensor and the throttle body with brake clean. Spray the MAF, use a toothbrush on the inside of the throttle body especially around where the throttle plate sits.

Apr 10, 2014 | 2001 Ford Focus

1 Answer

Mercury cougar idle

Run fault codes and look far a problem in the MAP/MAF sensors. Check and clean the air filter.

Aug 25, 2013 | Cars & Trucks

3 Answers

Car starts but when you let off the gas it stops. I replaced the fule pump and filter. Where should I check next, the trottle postion sensor?

Check the air filter , and clean inside the throttle body, behind the plate. also clean the mass air flow sensor in the air filer tube. use brake clean.Let me know we'll go from there

Nov 17, 2010 | 2000 Dodge Caravan

1 Answer

Engines jumpy... time for new spark plugs?

Probably not. Depending on your mileage and driving style it is more likely an Idle Air Control valve, Mass Airflow Sensor or Throttle body. I would purchase CRC MAF Cleaner and CRC Throttle Body cleaner. you will need to disconnect the induction hose from the air filter and throttle body. On the Taurus the air filter is loated on driver side under hood. Trace back from it and mid way youwill find a plastic cylinder that is wired in with a plug. Unplug the MAF. Make sure and notate which side is facing the engine as the air flow has to be the right way. I put a dot on the side that should face inward to remember the flow direction. Find a ventilated area and take the CRC MAF cleaner and spray the inside of the Mass airflow from about an inch away. Be careful there are very fine wires inside that can be broken by the nozzle by touching or being too close when spraying. Spray liberally and then set aside to dry. Continuing up the intake you will find the throttle body whihc is a cirucular intake that is metalic It has a butterfly valve inside. Use the same CRC brand but this time us CRC Throttle body cleaner. DONT USE CARB CLEANER OR OTHER BRAND. Ford coats their Throttle bodies with teflon and any other brand can eat this lining away. Clean in short bursts. You can gently take a clean shop rag to wipe inside with your finger as sprayed to dislodge some of the dirt, but be gentle. Dont use stiff brushes.. A qtip, a soft bristle tooth brush with very light pressure. as well. Clean it very well. Place rag underneath to catch any run off. After its cleaned and teh MAF is cleaned, replace the air filter and reassemble the unit. The car will be hard to start at first. Turn it over a few times and it will start. It will sputter a bit and then should run better. The plugs on modern vehicles are set to run 100K miles or more before changing and unless you are burning oil and fouling them out they should be fine. Start with MAF and Throttle body first. then move to plugs..Finally, the MAF and Throttle body should be cleaned every other oil change.

Jun 13, 2010 | 2004 Ford Taurus

1 Answer

I have a 97 Blazer, just had the fuel pump replaced and worked fine. But in the cold weather it won't start. Any tips?

Try energizing the fuel line twice, turn the ignition key to the on position for 30 seconds then turning it off for 5 seconds and then try starting the engine. This will warm up and clean the MAF sensor, and also ressurize the fuel line if the fuel pressure check valve has failed and that is located on the fuel pump return line. Clean the MAF sensor will also help in the cod weather starts, so you may want to clean the MAF with MAF cleaner and clean the Throttle body with throttle body cleaner and pay attention to the Idle Air control valve passage ways at the back of the throttle body opening. Good luck and keep me posted.

Dec 09, 2009 | 1997 Chevrolet Blazer

1 Answer

Car stalls when you put it in gear

Clean out the throttle body if you get a chance, You might be surprised how dirty it gets in there. 
Try looking below the throttle body mounted to the intake,you may have to remove the snorkel that goes between the throttle body and the air filter. I believe that's where your EGR valve is and it may need to get cleaned too or replaced, you might also try removing and cleaning your idle air control.

The idle air control is mounted on the passenger side of the intake,at the very end of the intake. make sure the engine isn't hot when you remove it because two of the rubber hoses have coolant from the engine in them and if it is hot it could spray you. I sprayed CRC throttle body cleaner on mine and it cleaned it up pretty good. also be careful not to turn the adjusting screw on it as you could make your idle worse.

You can check the EGR to find out if it is bad or plugged,with the engine idling reach under the body of the EGR valve and push up.if it is working the engine should try to die when you do this. I would also check to make sure there are no cracked or broken vacuum cracks or leaks in the snorkel going to the throttle body and with the engine running tap on the top of the maf sensor with your knuckles,if the idle changes than your maf sensor is probably bad. you can unplug the wires from the maf sensor with the engine running and if the idle doesn't change then its bad. These engines are temperamental,for instance they have to maintain vacuum in the engine to run properly_something as minor as the seal on the oil cap allowing air into the valve cover will make it run poorly. Have you checked for any codes or is the check engine light coming on?

Good luck and hope this helps.

May 13, 2009 | 1990 Nissan Stanza

1 Answer

Hard start when air temp is cold, backfires when warm

Try this, remove (MAF) Mas Air Flow sensor,(be sure key is OFF) so you don't set a trouble code when disconecting wire conector, with some throttle body/air intake cleaner from the outlet side of MAF, spray the sensor clean, let dry, reassemble.Remove snorkle from throttle body, and with a old tooth brush, clean throttle body& plate with cleaner, may take a couple of cans if throttle is badly 'coked' up. Hope this helps.

Feb 01, 2009 | 1999 GMC Sierra

1 Answer

Idling Problems, Idling Revs Up and Down

First just try unplugging the MAF and seeing if running the car with it unplugged resolves the problem. If it does then you have a faulty MAF and need to replace it. A faulty MAF won't necessarily show up on a diagnostics check. You will find the MAF between the air box and the throttle body housing on the right hand side of the engine bay at the back. The electrical connection plug you need to remove is on the top of it... To clean the throttle body housing, remove the pipe with the MAF in it (2 jubilee clips, one either end) then either try and clean the housing with it still attached to the car or unbolt it (4 ribe-headed bolts) and clean it off the car. You will also need to unclip the throttle cable and unplug the stepper motor (the black thing on the side)... If neither of these things work then you might have a faulty throttle stepper motor. Replacing this is a specialist job as it needs to be correctly calibrated after fitting. Other people on this forum have quoted prices between £100-200 for the part, fitting and calibration. For a cam belt change you are looking at around £200-£300. The diesel sound on startup is a knackered variator (it's on the end of the inlet camshaft). It's better to get one of these fitted at the same time as the belts are changed to avoid paying additional labour charges for having the belts removed and refitted again at a later time. Add around £100 on top of the belt change for a new variator. Exhausts can be fitted by any garage.

May 14, 2008 | Alfa Romeo 145 Cars & Trucks

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