Question about 2001 Cadillac DeVille

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My car is missing and it has air seeping from behind the piece that the massive air flow sensor hooks up to

My car engine idles up and down after I start it.I put a massive air flow sensor on it. but that did not solve the problem.It sounds like there is air coming from the back of the intake makeing it sound like it needs a tuneup.someone said that the motor sounds like it is loseing pressure and running on six valves instead of eight.the service engine light is on and a few more are on. It want pass a smog.

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  • inyomouth_20 Apr 13, 2009

    I did that but its comeing from the intake somewhere and how do I take it offf

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Try checking all of the vacuum hoses,..such as the power booster for the braking system,EGR valve hoses,from the sound of your description,it is loosing vacuum.

Posted on Apr 13, 2009

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The very first thing you need to check is that service engine light... The codes that it will give you will tell you what to look for. You can take it to many auto parts stores and they will check the error codes for you,

Posted on Apr 13, 2009

  • Scott Schoemann Apr 13, 2009

    The very first thing you need to check is that service engine light... The codes that it will give you will tell you what to look for. You can take it to many auto parts stores and they will check the error codes for you,

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There is an accordion like duct near the manifold that can crack My engine bushings had gone bad and the motor moved around making it tear We stumbled upon this by mistake we could clearly hear it was sucking air and thought it was the plastic intake manifold but that was fine I cant remember the whole part name but it it black and has folds in it Has the word duct in it.

Posted on Aug 02, 2009

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1 Answer

When running, why does the engine "hunt" and doesn't run stead(ily)?


Your mean it surges ! The idle goes up an down , not running at a Constant or steady speed . Well , a vacuum leak could cause that . Could have a IAC - idle air control problem , mass air flow sensor , TPS - throttle position sensor , map sensor , fuel injector problems . The first place to look would be having a scan tool hooked up . A professional type ! One that can view engine sensor data . Also check the battery an the charging system .

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HOW CAN I CLEAN THE MAF MASS AIR FLOW


Your mass airflow sensor should be right behind the air filter box. It should be in the hose between the airbox and the intake manifold. When you find it, just take the clamps loose and disconnect the wire connector to the sensor. Take the sensor out and clean it with a can of electrical cleaner or brake cleaner. Put it all back in and see what it does. It's also possible that it is a bad sensor. Clean it first and see what that does.

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My car want idle when u come to a stop!What might this be?


Could be a number of things, for starters you could have a massive air leak on your induction system. Does it idle when you start it, and only dies when in gear. Is there an engine light lit up on your dash. If so I'm guessing your mass air flow sensor is bad, or really dirty sometimes you can clean them. They are around a hundred bucks, the cleaner is 7 bucks might try to clean your MAFS (mass air flow sensor) As usual the best and cheapest thing is to just stop off at a National Parts Store and have them scan your vehicle for any CODES. Hope this helps, please let me know either way.

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Hello, I had my car hooked up to a computer today and the codes P102, P0113, and P111 came up. The engine misses when driving down the road, and the car frequently dies when turning corners and idling. ...


P0113 Intake Air Temperature (IAT) Circuit High Input Indicates the sensor signal is greater than Self-Test maximum. The IAT sensor maximum is 4.6 volts or -50 C (-58 F). Possible causes are Open circuit in harness, Sensor signal short to power, Damaged Sensor, Improper harness connection, Damaged PCM

P0102 Mas Air Flow (MAF) Circuit Low Input, The MAF sensor circuit is monitored by the PCM for low air flow (or voltage) input through the comprehensive component monitor (CCM) If during key ON engine running the air flow (or voltage) changes below a minimum calibrated limit, the test fails. Possible causes are MAF sensor disconnected, MAF circuit open to PCM, VPWRopen to MAFsensor, PWR GND open to MAF sensor, MAF RTN cirbuit open to PCM, MAF circuit shorted to GND, Intake air leak (near MAF sensor), A closed throttle indication, Damaged MAF sensor, Damaged PCM.

Mar 18, 2011 | Buick LeSabre Cars & Trucks

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2004 jetta tdi, has engine miss & lack of power, has p0101 present, if unplugged has less power, but misses less, already cleaned extremely clogged egr valve, changed engine oil/filter, checked maf...


Running rough?? If i took a guess I'd say there's a faulty injector. Does it smoke like hell ?? Does it also miss at idle?- If so get a line wrench and a rag handy. Start the car and while idling wrap the rag around the base of the fuel line connector on injector 1 and crack it just a bit until fuel comes out. It might spray, thus the rag. If the miss gets worse, that ain't the injector to blame. Continue with the other 3. If you crack a line and there is no or very little change in the miss then you found the guilty party.

On a long shot it could also be a stuck valve.

Did that get it?? It sounds like an issue other than MAF but.... get a multimeter and try probing the connecter to the MAF. When you find out what it is , please let me know. I'm curious

*The key must be on*

pin 1- ignore it
pin 2- gnd = 12-14v
pins 2- 3 = 12-14v
pin 4- gnd = 5v
pins 3- 4 = 5v

P0101 - Mass Air Flow Sensor (G70): Implausible Signal

Possible Symptoms

  • Loss of Power
  • Erratic Idle
Possible Causes
  • Mass Air Flow Sensor (G70) faulty
  • Air Leak(s) after Mass Air Flow Sensor (G70)
  • Intake Air Filter dirty/faulty
  • Ground Spots corroded or Paint Residue
  • Wiring and/or Connections from/to Mass Air Flow Sensor (G70) faulty
Possible Solutions
  • Check Intake Air Filter
  • Check Mass Air Flow Sensor (G70)
  • Check Ground Spots
  • Check Wiring and/or Connections from/to Mass Air Flow Sensor (G70)

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check aux air control valve , thats what controls the idle it may be bad,also with that kind of mileage i would replace the mass air flow sensor ,do that first, good luck , the mass air flow sensor has alot to do with your gas mileage .

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1 Answer

Fast idle


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2 Answers

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Hello,

You really need to start with basic troubleshooting. Is there spark to the spark plugs? Do you hear the fuel pump prime during initial Key On & during Engine Cranking?

Why did you change the MAF (mass airflow sensor)?

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