Hey Guys! Brand new to this forum. Looking to get some help on my current situation.

My car has been acting a bit funny since the temperature has dropped here in Kelowna (Canada lol);

The other day, I go to turn my car over, and as it starts up, It immediately dies* with a check engine light to follow**. I figure it might be an electrical issue, so I test my battery and inspect the terminals for connection problems, but everything passes with a green light.

I turn it over again, and it holds idle at around 1,000 RPM. But I notice it running a bit rough, and possibly misfiring. I rev the engine, and hold at around 3,000 RPM. It is defiantly misfiring

As the car warms up to operating temperature (15 min of driving later), the idle drops to 800 RPM and rough idle is no longer the case, the car acts/sounds fine as usual.

*During this whole process the car died all of a sudden while idling at an intersection, which was very strange.

**I can't read any of my codes since i'm running a jumper harness =S
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I just recently cleaned out the IACV, and the problem still persists. Next step is to check plugs and alternator.

Any help would be greatly appreciated. Thanks!

 

I am having a similar problem with my 98 spec B18C without the car dying on me. I currently run a low temp thermostat and fan switch, so I suspect those to be causing the problem along with a possible faulty coolant temp sensor. I will also be taking off my intake manifold and thoroughly cleaning it and the IACV. I'll report back in around a week or so, just waiting on all my parts to arrive!

 

Your best bet will be to be able to read the code(s). But, in this case, you just have to tackle the problem one step at a time starting with the lowest hanging fruits=Air filter, spark plugs, fuel...
Good luck.

 

Hey guys! So I checked the CEL, and after learning morse code (lol) these were the two codes that came up.

1. Manifold Absolutre Pressure (MAP Sensor)
2. Electrical Load Sensor (ELD sensor)

Got the wiring cleaned up, and MAP sensor replaced, but the problem is still present.

Need some Honda Gods to give me some love on this one.

 

The following is easy step by step on how to troubleshoot and fix your problem. Just in case it confuses you, all it says is there may be a faulty map sensor or a bad supply voltage between the input of the map sensor and the CPU or the CPU itself. So, read up:

The Manifold Absolute Pressure (MAP) sensor responds to changes in the intake manifold pressure (vacuum). 5 Volts is supplied to the sensor from the PCM (powertrain control module).

Inside the MAP sensor is a resistor that moves in relation to manifold pressure. The resistor varies the voltage between about 1 volt to 4.5 volts (depending on engine load) and that voltage signal is returned to the PCM to indicate manifold pressure (vacuum). This signal is essential for the PCM to determine fuel delivery. A P0107 DTC is set when the PCM sees that the MAP signal voltage is less than .25 volts which is too low.

Potential Symptoms
Anytime the MAP sensor signal is low the vehicle will likely have a very difficult time starting. Other symptoms may include:

Hard to start
Long cranking times
Sputtering/missing
Blowing black smoke
Poor fuel economy
Dies intermittently
MIL(Malfunction Indicator Lamp) illumination
Causes
The causes of a low MAP sensor signal circuit (P0107) could be any of the following:

Bad MAP sensor
Open or short in the signal circuit
Open or short in the 5 Volt reference circuit
Ground circuit open or shorted
Bad PCM
Possible Solutions
First, using a scan tool with the Key on and engine running, monitor the MAP sensor voltage. If it is reading less than .5 volts, turn engine off, unplug the MAP sensor and, using a DVOM (Digital Volt/Ohm Meter) check for 5Volts on the 5 Volt reference circuit.

1. If there is not 5 Volts on the reference circuit, then check for the reference voltage at the PCM connector. If it is present at the PCM connector but not the MAP connector, repair the open in the reference circuit between the PCM and MAP harness connector. If 5 Volt reference is NOT present at the PCM connector, check powers and grounds of PCM and repair/replace as needed. (NOTE: On Chrysler products, a shorted Crank sensor, Vehicle speed sensor or any other sensor that utilizes the 5 Volt reference from the PCM can short out the 5 Volt reference. To fix simply unplug each sensor one at a time until the 5 Volt reference reappears. The last sensor unplugged is the shorted sensor.)

2. If you have a 5 Volt reference at the MAP connector, jumper the 5 volt reference circuit to the signal circuit. Now check the MAP voltage on the scan tool. It should be 4.5 to 5 Volts. If it is, replace MAP sensor. If not, repair open/short in the signal circuit wiring and re-check.

3. If all appears okay, perform a wiggle test. Start engine and manipulate the harness, connector and tap on the MAP sensor. Note any changes in voltage or engine speed. Repair connector, harness, or sensor as needed.

4. If the wiggle test checks out, use a vacuum pump (or just use your lungs) to draw a vacuum on the MAP sensor vacuum port. As you add vacuum the voltage should decrease. With no vacuum, the MAP sensor should read approximately 4.5 volts. If there is no change in MAP sensor reading on the scan tool, replace MAP sensor.