Question about Honda Civic

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Code p0170 have a 1999 Honda Civic that is throwing a code p0170. Will not idle when cold. Blowing black smoke from out of the exhaust. Runs poorly when warmed up to operating temps. Wants to miss at 2500 RPMs.

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  • 88 Answers

- Intake air leaks
- Faulty front heated oxygen sensor
- Ignition misfiring
- Faulty fuel injectors
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Faulty Mass Air Flow (MAF) sensor
- Incorrect Positive Crankcase Ventilation (PCV) hose connection

Posted on Nov 26, 2013

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Posted on Jan 02, 2017

  • 9 Answers

SOURCE: Black smoke from exhaust,no idle in warm temps-97 Nissan 2WD 2.4L

I had a 1995 nissan pick up with a similar problem, may want to try cleaning out or replacing the EGR valve.

Posted on Jul 23, 2009

HondaCRX
  • 252 Answers

SOURCE: problem with cold start and blowing smoke, runs fine after warm

Honda engines (D series imparticularly) run quite smokey on start up. For some reason condensation builds in the exhaust once it has been left (this is assuming the smoke is clearish/white) Occasionally, if it is blue smoke, you might have a leaky oil seal (typically the crank position sensor), but it's no biggy as it's only a few mls of oil per week.

There's no such thing as a tune up. Honda's are controlled by their ECU. As long as your air filter is cleaned regularly, and especially having regular oil changes 6,000miles, it should run +250k miles.

Posted on Jun 22, 2010

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1 Answer

Oil coming out of exhaust


are you sure it is oil. it can be black smoke coming the exhaust mixed with water. if it is black smoke that is a sign of a wak ignition/ spark plugs and cap and rotor

Dec 27, 2012 | 1995 Honda Civic

1 Answer

I have a 1996 honda passport V6, the car was scanned and found code p0134. the car runs but after a few minutes of warming the car stalls and backfires runs terrible what can cause those type of problems


This code refers to the front oxygen sensor on Bank 1. Basically the oxygen sensor is inactive.

DTC P0134 - 02 Sensor Circuit No Activity Detected (Bank I Sensor 1)

The powertrain control module (PCM) provides a baseline voltage of about 450 mV on the oxygen sensor signal circuit. When cold, the PCM detects the the internal resistance of the sensor is high. As the sensor warms up the resistance is lowered and it starts producing voltage based on the oxygen content in the exhaust. When the PCM determines that the time it took for the sensor to warm up is greater than one minute or that the voltage is inactive (not reading outside 391-491 mV it views the sensor as inactive or open and sets the P0134 code.

Potential Symptoms: One or more of the following may occur:
* Check engine light illumination
* Poorly running/engine missing
* Blowing black smoke
* Poor fuel economy
* Dying, stuttering

Causes: A code P0134 may mean that one or more of the following has happened:
* Bad O2 (oxygen) sensor
* Bad heater circuit in the O2 sensor
* Wiring or connector to the sensor frayed / broken
* Blown heater circuit fuse
* Holes in the exhaust system
* PCM failure

Possible Solutions: The most common fix is to replace the oxygen sensor. But that doesn't rule out the possibility of:
* Rusted exhaust pipe
* Inspect wiring & connector(s) for problems
* Excessive amperage blowing heater fuse (still requires replacement of sensor but also replacement of blown fuse)
* Replace PCM (only as last resort after all other possibilities are covered.


Hope helps (remember rated and comment this).

Jul 15, 2010 | 1996 Honda Passport

2 Answers

Problem with cold start and blowing smoke, runs fine after warm


You may need a tune up if its been longer than 12,000 miles since the last one.

Apr 23, 2010 | 1990 Honda Civic

1 Answer

Black smoke from exhaust,no idle in warm temps-97 Nissan 2WD 2.4L


I had a 1995 nissan pick up with a similar problem, may want to try cleaning out or replacing the EGR valve.

Jul 23, 2009 | 1997 Nissan Pickup

1 Answer

Honda civic 1992 twin carburators model.


I dont know where do you live, but honda civic 1992 don use carburator, they are fuel injection, you can have coolant temp sensor problem, or map sensor problem, run diagnose jumping the diagnose wires loated in the passenger side, kick panell close to the door wall, better get the repair book in the parts store to locate the conector ,and read how you can run the diagnosis

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1 Answer

1997 jeep grand cherokee runs rich after long trips


Could have a bad map sensor. The Map sensor is located on the throttle body. I have seen countless Jepp that start blowing black smoke when they go bad. That would be a good starting place.

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1 Answer

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Replace the ECT sensor.
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