Question about 1995 Volvo 850

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Cleaned O2 and Mass Air sensors and now my car wont idle

My car has been having engine power problem ie loss of power after about 3k RPM. I heard that cleaning the mass air flow sensor and oxygen sensor might fix the problem. I cleaned the mass air flow sensor and cleaned the connectors with electrical cleaner since they were a bit dirty. Then I proceeded to take off the oxygen sensor. As I was taking it off, I was a bit worried about the wires twisting but I shrugged it off and got a cup of alcohol and scrubbed the O2 sensor with a toothbrush. Then I put the sensor back in, and when it was in I noticed that the wires were a bit twisted. Then I tried to start my car, it idled for about a second very roughly then died.
I think that I might have either twisted a wire and broke it or that I loosened up some **** in the sensor and now it reads incorrectly. I really dont feel like spending $160 for a new O2 sensor. Any suggestions?

Posted by on

  • blondetamadr May 22, 2009

    My fuel pump has been making noise for a couple of months, it only does this when the tank is half full so Im not too worried about it. Im going to try to clean the O2 sensor again and see if I can get more dirt out of it. Where is the throttle position sensor located?

  • blondetamadr May 22, 2009

    what happens when the throttle position sensor goes bad?

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  • Volvo Master
  • 1,632 Answers

TCP throttle position sensor, need a new one and O2 and check fuel pump presure. Vitally

Posted on May 22, 2009

  • Vitally Alcher May 22, 2009

    At the throttle body atached to the butterfly at intake.

  • Vitally Alcher May 22, 2009

    the ecm computer won't know what you want to do with the car,
    won't respond to acselerator pedal//rpm//idle//shifting gears///etc
    Vitally

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Posted on Jan 02, 2017

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1 Answer

Low idle & vibration at idle


I don't know if this will help. Had a similar problem with a 99 Blazer.
Would drop to between 300 and 500 rpm at stop signs and red lights, would stall and shake.
Did all the same checks, replaced mass air flow sensor, replaced cam sensor, cleaned the fuel injectors but the problem was still there.
Replaced both #1 and #2 O2 sensors in the exhaust pipes and now the vehicle runs fine. The idle is back to a steady 750 rpm in all stopping conditions. The Mass air flow sensor and Cam position sensor get information from the O2 sensors.

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2006 Ford Taurus code P0152


Common Problems That Trigger the P0152 Code
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  • Faulty Oxygen Sensor wiring or connections
  • Shorted Oxygen Sensor Heater element(s)
Common Misdiagnoses
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Had Po171 code due to failed emissions test..check engine light is on..So I had the mass air flow sensor replace, bothe oxygen sensors, pcv valve, air filter and also had tune-up and check engine light is...


replace the gas cap.. unless your car loss power when u give it gas.. and when u c a hill and it does not have power.. then its not the air mass flow sensor.. however u did everything but the gas cap

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P0068 on a 2006 Dodge Ram 1500 SLT. Rough "hunting" for idle. Momentary lag/loss of power from a stop. Random RPM changes while at a constant speed. Sometimes it feels like it drops out of gear...


P0068 Symptoms - Engine Light ON (or Service Engine Soon Warning Light)
- Lack/Loss of power
- Engine rough idle Possible causes - Large vacuum leak
- Leaking air duct system
- Mass Air Flow (MAF) poor electrcial connection
- Manifold Absolute Pressure (MAP) poor electrcial connection
- Faulty Mass Air Flow (MAF) sensor
- Faulty Manifold Absolute Pressure (MAP) sensor
- TP sensor not seated properly.
- Faulty Throttle Position (TP) sensor.
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P0068 DODGE Description The Powertrain Control Module (PCM) monitors a vehicle operation rationality check by comparing Throttle Position (TP) to Mass Air Flow (MAF) readings. If, during a self-test, the comparison of the TP sensor and MAF sensor readings are not consistent with the calibrated load values, the test fails and a diagnostic trouble code is stored in continuous memory.

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The car has no horse power, the check engine light is on and there is no problems with the computer board or co sensor


Hello, here are three of the most common causes for loss of horse power.

1. Idle air control valve. ( sometimes they can be removed and cleaned )
2. MAF, ( mass air flow ), sensor. ( sometimes they can be removed and cleaned )
3. O2, ( oxygen sensor ). ( needs to be replaced )

All three of these things are part of your emission system, and all three of these things, if faulty or dirty can prevent the EMC, ( electronic control module ), from determining the proper fuel/air mix ratio. The ratio should be 1 part fuel to 14.7 parts air. A bad fuel/air mix can cause the following.
a. Bad idle.
b. Loss of power/poor acceleration.
c. stalling/fake stalling.
d. Poor gas mileage.
e. Prevent engine from starting.

I hope this helps you.
Donnie

Mar 01, 2011 | 2000 Hyundai Accent

1 Answer

When i am sitting at a light the rpm reads .5 (below the 1), ltely my car has been cutting off while im waiting. The check engine light is also on


Hello,
Here are three of the most common causes for the issues your having;

1. A dirty air filter.

2. A faulty MAF, ( mass air flow ), sensor.

3. A faulty oxygen sensor.

All three of the above can cause one or more of the following; loss power, poor acceleration, poor MPG, fake stalling, stalling, and eventually can prevent the engine from starting at all.

It is because, with these three things the on board computer can't determine the proper fuel/air mix ratio. Often vehicle owners think the engine is not getting enough fuel when it's actually not getting enough air.

I hope this helps you.

Feb 17, 2011 | 1995 Nissan Maxima

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The vehicle was put on a diagnostic machine for loss of power and it coded the o2 sensor, and the mass air flow, and EGR valve. We put a new o2 sensor in and cleaned the mass air flow. It ran, but no...


no-- but could mean that the O2 sensor is not correct
it is a common misconception that all of the oxygen sensor are the same
the fact is that even they are known a oxygen sensors there are 2 completely different units
the sensor in the exhaust manifold before the cat converter is in fact a heated oxygen sensor and it's function is to report the exhaust composition so that the ecm can adjust the air/fuel mixture
the other is an o2 sensor located after the cat converter and fine tunes the system after the cat converter has done it's job
if the cat converter is faulty , the o2 sensor will try to have the ECM correct the mixture
the loss of power if it is a cat converter comes from a blocked exhaust system and that is most evident at high rpms or under power

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2 Answers

High rpm


Welcome to fixya, check the idle air control and the mass air flow sensor.

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