Question about Honda Civic

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1)it will not go over 3500 rpm (2)when it first starts it runs a little better for a minute or so and then back to not idling (3)the codes said bad MAP sensor, bad O2 sensor (up stream)and problem in the idle control system. (4)Do you know the problem or is it just one of these? I would'nt think a 70,000 car would have all these problems all of a sudden one day.(5)i changed the spark plugs w/ no impovment.#1 was realy crudy, the rest where ok

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  • dada2a Nov 19, 2008

    My Honda accord 99 V6 start and stop with check light on, OBDII gave the code as P0108. The runs on idle but switched on when you attempt to rev or engage gear.

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I'd lean toward the MAP/MAF sensor because of the rev limit. A car with a bad O2 sensor will still rev to redline - it'll just be running rich the whole time. Some manufacturers put in a rev limiter that kicks in if the MAP/MAF sensor goes bad, so I'd lean that way first. Clean the electrical connector with contact cleaner, and run a half a can of Seafoam through the vacuum system - this may clear up your issues. If not, I'd replace the MAP/MAF sensor before the O2 sensor.

Posted on Sep 16, 2008

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Posted on Jan 02, 2017

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Truck dies when idling


HI
first I would like to tell you, do this procedure only if the 5th digit of your VIN is C or K.

Description

The engine control module (ECM) learns the idle position of the throttle plate to ensure the correct idle. Anytime the throttle body is cleaned or replaced, the ECM must learn the new throttle position. The idle may be unstable or a DTC may set if the throttle position is not learned.

Conditions for Running the Throttle Learn Procedure

• DTCs P0101, P0102, P0103, P0107, P0108, P0111, P0112, P0113, P0506, and P0507 are not set.

• The engine speed is between 450-4,000 RPM.

• The manifold absolute pressure (MAP) is greater than 5 kPa.

• The mass air flow (MAF) is greater than 2 g/s.

• The ignition 1 voltage is greater than 10 volts.

Throttle Learn

Important: Do NOT perform this procedure if DTCs are set. Refer to Diagnostic Trouble Code

(DTC) List - Vehicle.

1. Start and idle the engine in PARK for 3 minutes.

2. With a scan tool, monitor desired and actual RPM.

3. The ECM will start to learn the new idle cells and Desired RPM should start to decrease.

4. Ignition OFF for 60 seconds.

5. Start and idle the engine in PARK for 3 minutes.

6. After the 3 minute run time the engine should be idling normal.

Important: During the drive cycle the check engine light may come on with idle speed DTCs. If idle speed codes are set, clear codes so the ECM can continue to learn.

* If the engine idle speed has not been learned the vehicle will need to be driven at

speeds above 70 km/h (44 mph) with several decelerations and extended idles.

7. After the drive cycle, the engine should be idling normally.

* If the engine idle speed has not been learned, turn OFF the ignition for 60 seconds

and repeat step 6.
8. Once the engine speed has returned to normal, clear DTCs.
Good Luck

Mar 04, 2014 | 1995 GMC Sierra

2 Answers

My explorer keeps stalling


A new mechanic, definitely!

Try checking Angie's List for reputable mechanics near you.

Jul 15, 2008 | 1996 Ford Explorer

1 Answer

Inconsistant idle


bad idle can be caused by 100 things, but for sure the ECU has lost control, we check all other things first then work dead idle last.
but the #1 cause of bad idle (you never said the low rpm hot?)
but EGR stuck open. is #1
other causes:
1; needs a tune up bad.
2: air fuel ratio bad, (bad fueling of any kind)
3: ECU stuck in limphome mode, is CEL glowing running? if yes, then pull the codes, better is a full scan now.

Apr 04, 2013 | 2005 Suzuki Forenza

1 Answer

My 05 chevy malibu is not excelerating or shifting properly...


I would test both the tps and map sensors.
map sensor is here:

0996b43f802030b8-etlvqcyxjdbbokifzikh1c5u-5-0.gif

Testing

Check the Manifold Absolute Pressure (MAP) sensor circuit as follows:
Ignition OFF, disconnect the MAP harness connector at the MAP sensor.Ignition OFF, test for less than 5 ohms of resistance between the low reference circuit terminal 2 and ground.If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal 1 and ground.If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.Verify the scan tool MAP Sensor parameter is less than 1 kPa.If greater than the specified range, test the signal circuit terminal 3 for a short to voltage. If the circuit tests normal, replace the ECM.Install a 3A fused jumper wire between the signal circuit terminal 3 and the 5-volt reference circuit terminal 1. Verify the scan tool MAP Sensor parameter is greater than 126 kPa.If less than the specified range, test the signal circuit terminal 3 for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.If all circuits test normal, test or replace the MAP sensor.

0996b43f802030bb-etlvqcyxjdbbokifzikh1c5u-5-2.gif


Check the Throttle Position (TP) sensor circuits as follows:
Ignition OFF, disconnect the harness connector at the throttle body.Ignition OFF for 90 seconds, test for less than 5 ohms of resistance between the low reference circuit terminal C and ground.If greater than 5 ohms, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM. Ignition ON, test for 4.8-5.2 volts between 5-volt reference circuit terminal E and ground.If less than 4.8 volts, test 5-volt reference circuit for a short to ground or an open / high resistance. If the circuit tests normal, replace the ECM.If greater than 5.2 volts, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM. Verify the scan tool TP sensor 1 voltage is less than 0.1 volt.If greater than 0.1 volt, test the signal circuit terminal D for a short to voltage. If the circuit tests normal, replace the ECM. Verify the scan tool TP sensor 2 voltage is greater than 4.8 volts.If less than 4.8 volts, test the signal circuit for a short to ground. If the circuit tests normal, replace the ECM. Install a 3A fused jumper wire between the signal circuit terminal D and the 5-volt reference circuit terminal E of the TP sensor 1. Verify the TP sensor 1 voltage is greater than 4.8 volts.If less than 4.8 volts, test the TP sensor 1 signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM. Install a 3A fused jumper wire between the signal circuit terminal F and the low reference circuit terminal C of the TP sensor 2. Verify that the TP sensor 2 voltage is less than 0.1 voltIf greater than 1.0 volt, test the TP sensor 2 signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM. Ignition OFF for 90 seconds, disconnect the harness connector at the ECM.Test for less than 5 ohms of resistance on all TP sensor circuits between the following terminals:ECM C2 signal circuit terminal 65 to TP terminal DECM C2 signal circuit terminal 63 to TP terminal FECM C2 5-volt reference circuit terminal 3 to terminal E If greater than 5 ohms, repair the affected circuit for open/high resistance.Test for infinite resistance between TP sensor 1 signal circuit terminal D and TP sensor signal circuit terminal F.If less than infinite resistance, repair the short between TP sensor 1 signal circuit and TP sensor 2 signal circuit. If all circuits test normal, replace the throttle body.

0996b43f802030be-etlvqcyxjdbbokifzikh1c5u-5-5.gif
Fig. Throttle Actuator Control electrical connector


Throttle Body Relearn Procedure
NOTE
Do NOT perform this procedure if DTCs are set.

Start and idle the engine in PARK for 3 minutes.With a scan tool, monitor desired and actual RPM.The ECM will start to learn the new idle cells and Desired RPM should start to decrease.Ignition OFF for 60 seconds.Start and idle the engine in PARK for 3 minutes.After the 3 minute run time the engine should be idling normal.
NOTE
During the drive cycle the check engine light may come on with idle speed DTCs. If idle speed codes are set, clear codes so the ECM can continue to learn.

If the engine idle speed has not been learned the vehicle will need to be driven at speeds above 70 km/h (44 mph) with several decelerations and extended idles.
After the drive cycle, the engine should be idling normally.

If the engine idle speed has not been learned, turn OFF the ignition for 60 seconds and repeat step 6.Once the engine speed has returned to normal, clear DTCs.

Jul 29, 2017 | 2005 Chevrolet Malibu

1 Answer

Vehicle unused with dead battery for 6 months will start but not maintain idle


The automatic idle speed control system has lost its adaptive idle learning due to the dead battery. To help to correct this in the short term run the engine at 2000 RPM until warm, then back down to 1500 RPM for 3 minutes, then 1000 RPM for 3 minutes, then let it idle for 5 minutes, this should get the system to a point in the idle learn that it doesn't stall out, then drive it for 20 miles under varied conditions of highway and stop and go and low speed operation, that should get all to work again. If you still have problems you will need to have the system scanned to see what is going on that is causing a stall. Also add fresh fuel, gas goes bad in about 3 months. Use the recommended grade of fuel.

Jan 20, 2012 | 2001 Mitsubishi Montero

1 Answer

Dear sirs...HELP!!!! ok we had issue w/ code P0303 and replaced plugs & wires...ran better when started up until I got ready to drive around block to test drive...idle seemed little rough when in park...


p0303 is cylinder 3 misfire. Check that plug, boot and coil. . You can move this coil and boot to another cylinder to see if the code changes. If it does, you have a bad coil or boot. Its most likely the spark plug boot on cyl 3.

May 02, 2011 | Ford Taurus Cars & Trucks

1 Answer

2001 ford focus


you may have a vacuum leak, or a bad idle air control valve, the first thing to do is have the computer scaned for codes,you can go to an autozone parts store they scan for free,if there are no codes then look for a vacuum leak around the intake may have a bad vacuum hose.

Mar 10, 2010 | 2001 Ford Focus

1 Answer

I am helping my daughter with her 2005 Altima 2.5 They were driving it on the highway and the check engine light came on, started missing, loss of power. It was smoking white (not like a burning type of...


First thing you can do to eliminate a possible cause is trade the coil packs between 1&4, and 2&3. Check again and if 1&4 are now dead, then you replace the bad coil pack.

You stated that the plugs were wet, but didn't say from what. What did the plugs smell like? Oil, fuel, or coolant?

Please let me know what was on those plugs, as there could be other causes as well.

Apr 18, 2009 | 2005 Nissan Altima

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