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OBD code po108. RPMs erratic and engine surging at idle

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Code po108 refers to manifold absolute pressure ( MAP) sensor/ barometric pressure (BARO) sensor---high input====causes--wiring short to positive---MAP sensor---BARO sensor---ECM
Check the MAP sensor first and replace if necessary

Posted on Feb 14, 2014

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Posted on Jan 02, 2017

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SOURCE: OBD 1 and 2 will not communicate with PCM.

a blown fuse will also cause the obd to not communicate

Posted on Nov 12, 2008

  • 1 Answer

SOURCE: engine lopes while idling or idles erratically

vaccum hose back of intake manifold, check elbow rubber fitting for any cracks.

Posted on Jan 29, 2009

  • 12 Answers

SOURCE: rough idle / engine surges until power is applied

Sounds like a possible vaccume hose leak?

Posted on Feb 07, 2009

  • 38 Answers

SOURCE: check engine light on and code po108

PO108 (map circuit high input) MAP is manifold absolute pressure... a sensor normally mounted on the intake. your code is suggesting a problem with this sensor, or its circuitry.

Posted on May 11, 2009

  • 514 Answers

SOURCE: When engine gets hot, idle is up and down with the

per this address "http://www.obd-codes.com/trouble_codes/" p0505 is a "IAC (Idle Air Control) System Malfunction" it gives some good suggestions to look at to find a solution for your problem.

Posted on Dec 14, 2010

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1 Answer

What does code PO108 mean on a 2001 Grand Cherokee


wow , you actually tried to look it up, a 1st time here.

the MAP is a baro sensor used to calculate fuel injection RATES.

if you have gross air leaks to the system the engine IDLE screams.

is it?

108 means the voltage is too high.

usually its unplugged, or bad sensor.

otential 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



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



http://www.obd-codes.com/p0108



and last. but before ECU.

low engine compression, is 1 more, causes , many



what i do is reseat the MAP sensor

i then make sure he vacuum port is not clogged. (both sides)

i then measure the output , keyon, and idle and gunning throttle.

any Voltmeter works here,

key on is 5v or near.

idle 1.8v

gun engine as the RPMs fall like a rock the volts tries to hit 0.5vdc.



http://www.fixkick.com/look/odds-ends/jeep/MAP-sensor-output-real.jpg



very very easy to find with a voltmeter

if the meter agrees with vacuum gage, then the MAP is ok

and you have air leaks or low vacuum for (VAST reasons)

ask.

Aug 19, 2014 | 2001 Jeep Grand Cherokee

2 Answers

92 dodge 1500 pick up 360 v8 automatic Starts, runs but hesitates, low power code 37 on diagnostic readour


Code 37 is torque converter clutch solenoid failure. Transmission wont shift in and out of overdrive.

Nov 28, 2012 | Dodge Cars & Trucks

1 Answer

I have a Subaru Legacy GX from 2000. It jumps from idle 750 rpms to 1500-2000 rpm when i barely touch the gas pedal. Ive changed the throttle position sensor, and measured 0,5-4V from closed to open. Hope...


Hi there,

Erratic idle is often due to a vacuum or air leak in one of the engine systems, or faulty sensors sending incorrect data to your engine's computer.

As your vehicle is OBD-II compliant (ie has OnBoard Diagnostics) your engine computer will have stored the appropriate fault codes.

Before you start changing any components, always have the codes extracted from your onboard computer as this process will quickly identify which circuit (or sensor) is causing this condition. Changing your TPS may have been unneccessary.


Cheers,




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May 15, 2011 | 2000 Subaru Legacy

1 Answer

My 1990 Celica won't stay at a steady idle. It will fluctuate between 1100 and 1800 RPMs every second unless I have it in a gear driving or rev the engine past 2000 RPMs.This started after getting it back...


Here are the most common causes of idle surge, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake

Jul 20, 2017 | 1990 Toyota Celica

1 Answer

98 Ford Explorer erratic cold idle / SOHC engine / idle continuously jumps from 500 - 2500 rpms when cold / is fine when warm


98 ford explorer erratic idle from cold reves jump. ok when warm but still stalls at times.

Feb 01, 2010 | 1998 Ford Explorer

1 Answer

1998 dodge ram pickup 318 eng. engine idle rough on warm-up engine idle rough after warm-up shutting off engine and starting back up engine also runs sluggish in over drive at a low idle. I have...


If the engine seems to run fine over 1450 RPM maybe there is a vacuum hose leaking or EGR valve is slightly stuck open. Any help from the OBD II trouble codes? Or is there simply no MIL and no stored information in the OBD II computer read at the local parts store through the connector by the drivers knee?

Dec 04, 2009 | 1998 Dodge Ram 1500 4WD

1 Answer

Trouble with my rpms


Here are some of the causes of surges, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

Apr 13, 2009 | 2004 Chevrolet TrailBlazer

1 Answer

Rpms Too Low


the idle speed is controlled through the on board fuel injection control module (known as the PCM), even if u raise the idle at the throttle body the computer will slow it back down, however there is a problem that causes slow idle, do the following procedure to correct the slow idle issue, follow it exactly.

Here are some of the causes of surges, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

Apr 07, 2009 | Pontiac Grand Prix Cars & Trucks

1 Answer

2007 Corolla "S"


Your ignition core could be going bad. One simple and free! thing you could try is to goto Autozone or Advanced Auto store (if you live close to either one) and ask if you can get a OBD scanner/diagnostic tool hooked up to your car. They don't charge anything for this service. Hopefully, some code or codes will show up on the diagnostics, and reveal the possible problem.

Good luck!

I Can Fix It!

Mar 27, 2009 | 2007 Toyota Corolla

1 Answer

2003 Ford Taurus wants to die when coming to a stop


TRY THIS AND LET ME KNOW IF IT CORRECTS YOUR PROBLEM
Here is the most common cause of surges and stalls at stops and low erratic idle speed and rough idle, it is the idle speed control air-bypass valve and throttle valve (IAC for short), they get full of gunk over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake

Mar 17, 2009 | 2003 Ford Taurus

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