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2003 vw jetta 1.8t changed the mhf still losing power

I know notes I was losing power wen I stepped on the gas so I changed the mass flow sensor & its still **** it I just don't know what it could be no one ells dose

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  • Volkswagen Master
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CHECK LIGHT ON,,,,,,,,,U SHOULD CHECK FOR LOSS OF TURBOS PRESSURE FIRST..IF U HAVE ONE U CAN HEAR A HISSING SOUND WHEN ACCELERATING....U MIGHT NEED TO CHECK THE FUEL FILTER AND FUEL PRESSURE...U MUST HAVE 3.5 BARS ....

Posted on Apr 22, 2014

6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

emissionwiz
  • 74896 Answers

SOURCE: P103 code in a 98 VW Jetta, 2.0 liter

THAT LEAK IS UN-METERED AIR ENTERING THE ENGINE, FIX IT AND RETEST SYSTEM. P103 IS A MAF CODE. A MAF MEASURES THE AIR ENTERING THE ENGINE, AND BASED THAT AND ON OTHER DATA THE PCM DECIDES THE AMOUNT OF FUEL TO INJECT.

Posted on Aug 29, 2008

  • 39 Answers

SOURCE: mass air flow sensor bad on 2002 monte carlo ss

It's should be a simple remove and replace. Just make sure the engine is off. Also do not touch any of the filament wires on the sensor, just the plastic housing. Also after you install it drive the car for a little while (city speeds, cruising speeds and inbetween). That way the computer will be able to readjust its setting since it is a new sensor.

Posted on Apr 02, 2009

  • 155 Answers

SOURCE: How do I change the temperature sensor under the

It’s located on the driver’s side of the engine on top /side of the head.. midway.. I don’t think you need to remove the engine cover to see it.. if it is the correct one it will have a dark green top.. the bad version has a black top… but they can all go out to lunch on you if old enough.

To replace.. make sure the car is cool..
You need a hood tool.. or small pair of pliers to remove the retaining clip that holds it in place.
Place a rag under and around it to catch the coolant.. you will lose less than a half a cup.. if that.

Pull the retaining clip back toward you.. try not to drop it.. (another good reason for the rag)

Wiggle the sensor.. pop it out.. and replace with the new green top one make sure you clean the area well.. and when you reinstall the new one that the c clip goes back on straight or it will leak.

Once you see the part out of the box.. you will understand how it works

Start the car.. check for leaks.. run until warm with the heater on.. top up the coolant overflow bottle with distilled water.. (if more than a half a cup.. you should mix the proper anti freeze and distilled water and then top up with that)

Good luck

Posted on May 06, 2009

  • 1 Answer

SOURCE: 000 NISSAN Xterra -- after warming up, loses RPM by 500-1000..... have replaced ignition wires and distributor, checked mass air flow sensor and OK.....

I had a problem on my Nissan Xterra 2000. Symptons sound similar. In my case, it ran fine for a while and then suddenly the engine starts to stumble and lose output. At one point it did not even have enough HP to move. Irregular idling too. Thought it was water in my fuel. Bought water remover from the store and added to gas tank. Problem did not go away. Instead, "Service Engine Soon" light came on. Had to have it towed to the dealer as there was no way the engine could keep up with traffic. Dealer replaced the "Crank Position Sensor" today. Parts $33.00, Labor: $300 (about 3 hrs worth of work). Seems to work fine now but I will wait and see. Dealer also stated that Distributor bearing appears to be noisy and will need to be replaced sooner or later. I will wait for it to go before I fix that.

Posted on May 27, 2009

MNfisherman
  • 11896 Answers

SOURCE: replacing mass air flow sensor in 97 vw jetta

If the mass flow sensor was bad, the check engine light should of came on giving off an engine code. To remove the mass flow, disconnect battery neg cable, then pull of the wire harness and pull out mass. You will probably have to remove the air intake hose.

Posted on Jul 03, 2009

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What is the mhf sensor located on a 1999 ford windstar


Never heard of a MHF sensor. There is an MAF sensor, (Mass Air Flow) located inside the air body where the air filter housing is though. Check your data and repost with engine size if that is not the answer you seek. Also a trouble code would be helpful to determine what the problem may be.

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Change the timing belt. My "educated" guess is that the belt has lost a couple teeth and jumped timing. I got the same codes for a Nissan frontier and when I took the belt off, it was missing several teeth in more than one spot.

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2001 VW Jetta 1.8T The problem we are having is no acceleration. We have changed anything and everything you can think of. The car runs fine but no power.


Failed mass airflow sensor, failed turbo, and turbo waste gate valve sticking open are all things that will do just that.

There was a recall on the mass air flow sensors on these vehicles but they would not replace them in the past unless they failed.

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Replacing mass air flow sensor in 97 vw jetta


If the mass flow sensor was bad, the check engine light should of came on giving off an engine code. To remove the mass flow, disconnect battery neg cable, then pull of the wire harness and pull out mass. You will probably have to remove the air intake hose.

Jul 03, 2009 | 1997 Volkswagen Jetta

1 Answer

P103 code in a 98 VW Jetta, 2.0 liter


THAT LEAK IS UN-METERED AIR ENTERING THE ENGINE, FIX IT AND RETEST SYSTEM. P103 IS A MAF CODE. A MAF MEASURES THE AIR ENTERING THE ENGINE, AND BASED THAT AND ON OTHER DATA THE PCM DECIDES THE AMOUNT OF FUEL TO INJECT.

Aug 29, 2008 | 1998 Volkswagen Jetta

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No power up hills


If you had a bad mass air sensor, it should register a fault code. Ditto for oxygen sensors. I'd change the fuel filter for sure, as well as spark plugs (make sure they're gapped correctly), and run a bottle of Seafoam through the gas tank. If that doesn't do it, change your cap, rotor, and spark wires (all told you're under $100 for everything).

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