Intermittent miss @cruise 60-70 mph,intermittent flooding on cold start,repaired broken wire @ maf,replaced maf. no codes,data page shows all values within specs.using snap-on solus
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Please go to the link provided and just input the code for definition and possible causes. Keep in mind a fault code doesn't mean a particular part is defective, it only indicates that a problem in that circuit or the signal given is not correct for the values seen by other sensors. Diagnostic Trouble Codes for OBD II
Your car cold start valve puts more gas into the system keeping your engine running higher RPM. When you car warms up, the cold start valve will stop working and your car RPM will drop. What you could have is a vacuum hose disconnected which puts more air into your engine - therefore when you press on the gas pedal, your engine would shut off or you find lack of power and then shut off.
Could be several things, such as leaky fuel injector flooding cylinder after shutdown, or oil fouling plug due to bad valve guide seal of broken piston ring. Install brand new plug, run about 20 miles, let engine get cold overnight, remove plug to red is it wet with gas or oil sooty.
P0108 - (Manifold Absolute Pressure/Barometric Pressure Circuit High Input The MAP (Manifold Absolute Pressure) sensor measures engine manifold negative air pressure. It's usually a three wire sensor: a ground wire, a 5 volt reference wire from the PCM (Powertrain Control Module) to the MAP sensor, and a signal wire that informs the PCM of the MAP sensor voltage reading as it changes. The higher the engine vacuum, the lower the voltage reading. The voltage should range between about 1 volt (at idle) to about 5 volts (WOT wide open throttle).
If the PCM sees the voltage reading from the MAP sensor is greater than 5 Volts, or if the voltage reading is higher than what the PCM considers normal under certain circumstances, a P0108 DTC will set.
Symptoms of a P0108 DTC code may include: * MIL (Malfunction Indicator Lamp) will likely be on * Engine may run poorly * Engine may not run at all * Fuel mileage may decrease * Presence of black smoke at exhaust
Potential causes of a P0108 code: * Bad MAP sensor * Leak in vacuum supply line to MAP sensor * Engine vacuum leak * Short on signal wire to PCM * Short on reference voltage wire from PCM * Open in ground circuit to MAP * Worn engine causing low vacuum
Possible Solutions: A good way to diagnose if the MAP sensor is to blame would be to compare the KOEO (key on engine off) MAP sensor reading on a scan tool with the Barometric pressure reading. They should be the same because they both measure atmospheric pressure.
If the MAP reading is greater than 0.5 volt off of the BARO reading, then replacing the MAP sensor would likely fix the problem. Otherwise, start the engine and observe the MAP reading at idle. It should normally be about 1.5 volts (varies according to altitude).
a. If it is, the problem is likely intermittent. Check all the vacuum hoses for damage and replace as necessary. You can also try wiggle testing the harness and connector to reproduce the problem. b. If the scan tool MAP reading is more than 4.5 volts, check the actual engine vacuum reading with the engine running. If it is less than 15 or 16 in. Hg, then the PCM is probably not seeing enough vacuum (due to a worn engine, perhaps) for a given operating condition (which causes a higher than normal voltage signal to the PCM) and setting the code. Repair the engine vacuum problem and retest. c. But, if the actual engine vacuum reading is 16 in. Hg or more, then unplug the MAP sensor. The scan tool MAP reading should indicate that there is no voltage present. Check that the ground from the PCM is intact and also that the MAP sensor connector and terminals are tight. If the connection is good, then replace the map sensor. d. However if, with KOEO, & the MAP sensor unplugged, the scan tool shows a voltage reading, then there may be a short in the harness to the MAP sensor. Turn the ignition off. At the PCM unplug connector and remove the MAP signal wire from the connector. Re-attach the PCM connector and see if with KOEO, the scan tool MAP reading shows voltage. If it still does, replace the PCM. If not, check for voltage on the signal wire you just removed from the PCM. If there is voltage on the signal wire, find the short in the harness and repair.
P0104 - Mass Air Flow (MAF) Circuit Intermittent Basically this means that there is a problem with the Mass Air Flow High (MAF) sensor or circuit. A more technical description would be that the MAF is producing incorrect air flow readings. Other MAF sensor circuit DTC trouble codes are P0100, P0101, P0102, and P0103.
Symptoms: You will likely not notice any serious drivability problems, although there may be symptoms such as a general decrease in power or sluggishness.
Causes: A code P0104 may mean that one or more of the following has happened: * The mass air flow (MAF) circuit is incomplete (broken / frayed wire, etc.) * There is an air leak in the intake system
Possible Solutions: The simplest thing to do is to reset the code and see if it comes back. Then start with the cheapest, easiest repair procedures: * Verify that the Mass Air Flow Sensor wiring is connected properly and that there are no broken / frayed wires. * Inspect for any air leaks near the MAF sensor. * Check the voltage of the MAF sensor (refer to a repair manual for vehicle specific information) * Replace the MAF sensor.
P0102 - Mass Air Flow (MAF) Circuit Low Input Basically this means that there is a problem with the Mass Air Flow (MAF) sensor or circuit. A more technical description would be that the MAF circuit had lower than expected voltage (air flow). Other MAF sensor circuit DTC trouble codes are P0100, P0101, P0103, and P0104. Symptoms: You will likely not notice any serious drivability problems, although there may be symptoms such as a general decrease in power or sluggishness.
Causes: A code P0102 may mean that one or more of the following has happened: * The MAF may be disconnected, or a wiring connection may be bad * The MAF may be dirty or otherwise contaminated (Note: if you use a reusable oiled air filter, be careful not to apply too much oil or that can contaminate the MAF). * The MAF sensor may be faulty * The vehicle computer may be faulty (very rare)
Possible Solutions: The simplest thing to do is to reset the code and see if it comes back. Then start with the cheapest, easiest repair procedures: * Verify that the Mass Air Flow Sensor wiring is connected properly and that there are no broken / frayed wires. * Inspect for any air leaks near the MAF sensor. * Take the MAF out and clean it using a spray cleaner such as brake cleaner or electrical contact cleaner. Be gentle with the sensor. * Check the voltage of the MAF sensor (refer to a repair manual for vehicle specific information) * Replace the MAF sensor.
P0101 - Mass Air Flow (MAF) Circuit Range/Performance Problem Basically this means that there is a problem with the Mass Air Flow (MAF) sensor or circuit. The PCM detects that the actual MAF sensor frequency signal is not within a predetermined range of the calculated MAF value for more than 4.0 seconds. Other MAF sensor circuit DTC trouble codes are P0100, P0102, P0103, and P0104.
Symptoms: You will likely not notice any serious drivability problems, although there may be symptoms.
Possible Solutions: The simplest thing to do is to reset the code and see if it comes back. Then start with the cheapest, easiest repair procedures: * Inspect for the following conditions: An incorrectly routed harness--Inspect the harness of the MAF sensor in order to verify that it is not routed too close to the following components: - The secondary ignition wires or coils - Any solenoids - Any relays - Any motors * A low minimum air rate through the sensor bore may cause this DTC to set at idle or during deceleration. Inspect for any vacuum leaks downstream of the MAF sensor. * A wide open throttle (WOT) acceleration from a stop should cause the MAF sensor g/s display on the scan tool to increase rapidly. This increase should be from 6-12 g/s at idle to 230 g/s or more at the time of the 1-2 shift. If the increase is not observed, inspect for a restriction in the induction system or the exhaust system. * The barometric pressure (BARO) that is used in order to calculate the predicted MAF value is initially based on the MAP sensor at key ON. * When the engine is running the MAP sensor value is continually updated near WOT. A skewed MAP sensor will cause the calculated MAF value to be inaccurate. The value shown for the MAP sensor display varies with the altitude. With the ignition ON and the engine OFF, 103 kPa is the approximate value near sea level. This value will decrease by approximately 3 kPa for every 305 meters (1,000 feet) of altitude. * A high resistance on the ground circuit of the MAP sensor can cause this DTC to set. * Any loss of vacuum to the MAP sensor can cause this DTC to set.
If you suspect the condition may be related to aftermarket accessories, refer to Checking Aftermarket Accessories in Wiring Systems. Here as an aid in resolving your P0101 trouble code (DTC)...
TP, VSS, Misfire, IAT, MAP, Idle Speed, Fuel Injector, ECT,
CKP, or MAF Sensor DTCs are not set.
System voltage is between 9.0-18.0 volts.
Possible Causes:
Loose terminal connection
Use a corresponding mating terminal to test for proper
tension. Refer to Testing for Intermittent Conditions and Poor
Connections , and to Connector Repairs in Wiring Systems for diagnosis
and repair.
Inspect the harness connectors for backed out terminals,
improper mating, broken locks, improperly formed or damaged terminals,
and faulty terminal to wire connection. Refer to Testing for
Intermittent Conditions and Poor Connections , and to Connector Repairs
in Wiring Systems for diagnosis and repair.
Basically this means that there's a problem with the Mass Air Flow (MAF) sensor or circuit.
You will likely not notice any serious driving problems, but there may be symptoms like a general decrease in power or sluggishness. Causes
A code P0100 may mean one or more of the following:
* The MAF may be disconnected, or a wiring connection may be bad. * The MAF sensor may be faulty.
Possible Solutions
Use an OBD II Reader (or go tou your local parts store and they will for free) and reset the code and see if it comes back. Then start with the cheapest, easiest repair procedures:
* Check the Mass Air Flow Sensor wiring/harness is connected properly and that there are no broken / frayed wires. * Unplug and reconnect the MAF wiring harness a few times to clear the contacts. * Check the voltage of the MAF sensor (refer to a repair manual for vehicle specific information). * Replace the MAF sensor.
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Basically this means that there's a problem with the Mass Air Flow (MAF) sensor or circuit.
You will likely not notice any serious driving problems, but there may be symptoms like a general decrease in power or sluggishness. Causes
A code P0100 may mean one or more of the following:
* The MAF may be disconnected, or a wiring connection may be bad. * The MAF sensor may be faulty.
Possible Solutions
Use an OBD II Reader (or go tou your local parts store and they will for free) and reset the code and see if it comes back. Then start with the cheapest, easiest repair procedures:
* Check the Mass Air Flow Sensor wiring/harness is connected properly and that there are no broken / frayed wires. * Unplug and reconnect the MAF wiring harness a few times to clear the contacts. * Check the voltage of the MAF sensor (refer to a repair manual for vehicle specific information). * Replace the MAF sensor.
Thanks for using FixYa - a 4 THUMBS rating is appreciated for answering your FREE question. @@@@
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