Question about 2008 Dodge Ram Pickup 2500

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I HAVE A R2500 HEMI. WILL NOT IDLE AND HAS BAD MISFIRES UP INTO HIGH RPMS. ONLY CODE THAT APPEARS IS P0172 1/1 FUEL SYSTEM RICH. GOT NEW PLUGS AND REPLACED APP SENSOR AND HAD REFLASHED. FUEL PRESSURE AT 50 PSI. PLUGS ARE BLACK AS IF ITS RUNNING RICH. ALL COILS OHMED OUT THE SAME AND INJECTORS ARE ALL CLICKING. ANY SUGGESTIONS

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This vehicle is a 2008? Its under warranty correct?Take it right back to Dealer . Its their problem. I would't touch a thing.

Posted on May 26, 2010

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1 Answer

00 honda passport intermittent rough idle


called misfire.
that means its not holding closed loop status at idle
ever do a tune up on it?
old spark plugs dont work, they MISFIRE and idle fails.
all cars for 100 years ,same , gas engines.

it can also be, bad fueling. or a bad engine.
we check compression first
then spark then fueling;
in that order, engine can not run right out of that order.
so misfire.
too rich misfire.
or too lean.
we check that by gazing at the spark plug tips ,
black is rich, white is lean.
most cars are cream or very light tan color. normal.
learn to read the spark plug tips.

its and 2000, and the scan tool will show the car is not i closed loop
at idle, fix that first. and DTC errors like MISFIRE P0300 or bad idle.
the same scan too show LTFT, long term fuel trim.
if its way far from 0 , the fueling is wrong.
-3-5% is normal. -50 is stuck rich and misfiring.

Jun 07, 2014 | Cars & Trucks

1 Answer

Why terracan spark timing p1300 fault


a Hyundai Terracan????????
what year, must we guess that too, and country? and engine size option too?

i think that is random misfire.
what is the question,
how to diagnose it?, read the FSM.
or who can fix it, answer any ASE mechanic on earth can.

open the FSM what does it say about 300s.
all say the same thing. MISFIRE GROSS and random cylinders.
and can be bad engine compression bad ,bad spark or bad fueling.

top causes. (not a guess, )
1: never ever doing the 60k mile service, not EVEN new spark plugs.
2: lean AFR. (1 example, low fuel presssure) for dirty MAF if it has one.
3:rich Air fuel ratios. (or flooding) causing misfire, high fuel pressure.
too high, (horrible clogged up air filter? extreme)
4: cam timing way off, cam belt slip or even a chain, if deaf.
#4 cause huge drop in compression.

That is the why, there are more.
why not get the car scanned and check out for if the engine
needs help or sensors read wrong using a SCAN TOOL.
does cooling system (engine) hit 180F or more. hold there.
if not it will rich misfire.
using a real scan tool shows all DTCs codes stored. other wrong or cheap tools will miss lots of factory code.s

good luck.

May 23, 2014 | Cars & Trucks

1 Answer

2.3l 2001 ford ranger rough idle and running rich and misfiring with p0301 code


You have to correct the cylinder misfires first

You may have vacuum leaks somewhere in the
intake or exhaust

You really need to look at data with a scan tool

You start with Mode $06 & cylinder misfire count ,if that
even works well on your motor

Then you look at fuel trim & add short & long together,
to get an idea if it is running rich,which would be a lean
condition from a vacuum leak or rich from leaking injectors

All the data is only good if you haven't cleared it or disconnected
the battery. If you did, then you have to drive until all I/M Monitors
run & then look at data

You look at O2 sensor data & even scope them

You made no mention of checking for codes
No mention of a cylinder leak down test for valve leaks
Exhaust Converter age or condition !
Fuel Pressure !

Mar 05, 2014 | Ford Ranger Cars & Trucks

2 Answers

98 Pontiac GRAND am


The plugs and crank sensor could have done it, but the TPS and idle air control would have nothing to do with a random miss.
A more likely cause is the ignition module or a fuel problem. You may have to wait until the problem is bad enough to kill the engine or you have more codes to check out.

May 20, 2013 | Cars & Trucks

2 Answers

Cylinder 5 and im also getting p0507 idle is higher then expected. ive change plugs wire cap button cam sensor and distributor. but now its throwing the codes p0300 and p0507 it goes from p0300 to p0305...


po 300 is random/ multible cylinder misfire detected po507 idle system rpm high-- go to this site for the po507 meaning--www.obd-codes.com/p507 === please go to this site for the po300 code---- www.obd-codes.com/p0300

Random/Multiple Cylinder Misfire Detected have a good day !!

Feb 15, 2011 | 1997 GMC Sierra

1 Answer

I have a 1992 Isuzu Amigo with the 4cyl 2.6 motor 4x4. At first the truck would run alittle funny when first started but once you wound it up a few times it would run fine. When driving down the street at...


the CHECK engine lamp did not lie, you need to use the diagnostic jumper and see why.

the cat converter if good can eat the nasty gases of a bad running engine, in fact that its #1 job that.
so it won. see? and overheats too, if rich enigne,
ever get tuneup this decade? sparks filters.etc.

that is a misfire, is spark plugs are old , how can it not be is the question./
ahhh you do use the diagnostic jumper
code 15, so
if the collant really is 180f Using and IR thermal gun then it IS.
and the ECT is bad, or wires to it bad.
and if true, sure it sucks fuel, all EFI does that if ECT lies.
all do.,

Low Coolant Temperature{5}{7}

the ECU reads like 300 OHM hot
if it reads like 50,000 ohms it thinks its in Sibera.
so goes rich as H3LL to burn Siberian fuel.
really.. but your not in Siberia i bet.
its just a temperature sensor.
the code 15 i think means the wires are broken to it.
the coolant must be full, or the ECT will lie, big time,
it cant measure AIR temps ever, not in the least.

im betting ECT wires fail off or cut.

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2 Answers

Trouble codes for saturn ls2 car is showing the following trouble codes. po300, po306, po451 p2bo3 and c112b


P0300 Multiple Cylinder Misfire Detected

P0306 Cylinder 6 Misfire Detected

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I have no idea what those last two are. Typo, maybe?

Your first two codes could be caused by old spark plugs and/or leaking plug wires.

Your EVAP code could be a bad fuel tank pressure sensor or a malfunctioning EVAP system. With that code, if you remove your fuel cap and get a whoosing sound, then it is an issue with your EVAP system not properly venting the tank. If you don't get that sound, then the tank pressure sensor is bad.

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3 Answers

I have a 2007 Dodge Ram 1500 with the 5.7 HEMI/MDS engine.If I shut the engine down when hot and then restart within a short time the idle goes up and down by about 100 RPM.It settles itself out after...


YOU COULD BE HAVING ENGINE MISFIRE.DUE TO BAD SPARK PLUGS AND WIRES.ALSO DIRTY FUEL INJECTORS WILL CAUSE ENGINE TO ROUGH IDLE OR IDLE UP AND DOWN.PUT A BOTTLE OF FUEL INJECTOR CLEAN IN A FULL TANK OF GAS.ALSO CHANGE PLUGS AND WIRES.IF TRUCK HAS 30000 TO 60000 MILES ON IT.THATS THE SCHEDULE MAINTENCE INTERVALS IF SPARK PLUGS HAS NOT BEEN CHANGED.

Feb 14, 2010 | 2005 Dodge Ram 1500

1 Answer

1991 Camry running rich


check for vacuum leaks especially around the intake manifold gasket. Although the engine appears to be running rich, it could also be misfiring due to being too lean in one cylinder. When the cylinder doesn't fire the charge, it goes into the exhaust completely unburned and looks like a rich running condition due to the unburned fuel. If it is a vacuum leak causing the problem, the engine will run fine at road speeds but misfire at idle and not pass smog.

Jan 30, 2009 | 1991 Toyota Camry

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