Question about 1998 Dodge Ram 1500 4WD

1 Answer

Replaced out flow CO2 sensor with after market from NAPA. Now when starts revs up to 1500 and back to 750 many times untill it warms up. Any ideas as to why?

Posted by on

  • myoldman66 Sep 03, 2010

    did as stated, waited over night to get cool. still dos same thing



1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Dodge Expert
  • 1,868 Answers

Hello! The defective O2 sensor is an indication of carbon deposits...
The Idle Air Control is probably fouled...Remove, inspect, and clean if necessary...Guru...........Saailerreplaced out flow CO2 sensor - ff32f4e.gif

Posted on Sep 01, 2010

  • David Burbee
    David Burbee Sep 03, 2010

    Hello! Before you spend money; When you pulled the Idle Air Control, was the internal port clear of any deposits? If the port and tip of the IAC are clean and the connector wires and pins appear free of trouble...The IAC is defective...It controls the idle speed and "hunting" is a common fault...The changing of the O2 sensor, on the surface, does not have a relationship to the IAC...There is one other quick test you can perform to eliminate any possibility...

    Set an ohmmeter on the X10 scale...One probe to the center of the - battery post...The other to chassis ground...Should read very near a dead short...Move the probe from chassis ground to the engine block...Same results...If you read 200-1000 ohms; Grounding is at fault...

    The cost of an Idle Air Control Valve is around $55...........Saailer



1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

2 Answers

I have a 1989 Mazda 323, when cold engine idles very high, when very cold it idles so high that rev limiter kicks in, and it revs up, limiter kicks in, revs up limiter kicks in, once it warms up idle drops...

Have it looked at by a dealer,iam not sure here but i think you have a vacumn leak like the feed pipe to the servo split but really you need a mechanic who works on these cars day in day out and they will go straight too the problem for you

Jan 18, 2015 | 1989 Mazda 323

2 Answers

2008 Chrysler Pacifica (4.0L V6). I can't rev my engine over 2000 RPM

Sorry do not understand this F lark please use centigrade ,Anyway enough of winding up my colonial cousins but i do feel the problem is here quite simple and thats you have damaged a sensor with the extreme cold and without plugging in my OBDII reader and then using the thing to read the sensors with the engine running to check the voltages of things like the mass air flow and O2 sensors ect then i would have no idea offhand,iam not a master at being able to give a diagnostic from afar and i dont want to give you a load of codswallop to make myself look good .Best advice i offer is to take car to a dealer ,then clear the garage out get rid of the pool table ,or sling the illegal immigrants out and park your car in the garage with a nice little heater under the engine or one of them plug in heaters like the swedish home market cars have.

Jan 09, 2014 | Cars & Trucks

1 Answer

1989 S-10 started running rough, now it's not running at all.

WOW ! believe it or not you did good ! what else could it be ? does this engine have a MAS, mass air flow sensor ? sell your scanner or take it back for refund, buy a new MAS, if your engine has one, and replace your air cleaner if you haven't. this part is a major player, if you have one, make sure its an OEM replacement part, not after market ! have you checked all your VACUUM LINES, is this an automatic ? anther thing, now that I'm thinking, what kind of COIL do you have ? I would suspect your coil and all that relates to the coil ! DO THIS FIRST ! before anything else. then more on, but I have a idea that this is it, go for it, when coils get too hot they tend to go bad, how are your spark plug wires ?

Mar 03, 2013 | Chevrolet S 10 Cars & Trucks

2 Answers

Renault traffic van that has no power until turbo starts to boost. Some times when i labour the engine at low revs the glow plug light will come on too? Any idea's?? Thanks

i've got trafic 100dci 2001 year-had poor exceleration upto 2000 revs then turbo cut in,also at speed-mainly uphill the power would start to pulse(like small jerks forward)until it ran out of steam-80ish,changed egr valve-didn't fix it! then tested air flow meter and found figures incorrect,so replaced,also tested the tubo rod(down the back of the engine -visible with air filter housing removed)this was very stiff,so used wd40 to clean then spray oil to lube and worked the rod backward and forward until it moved freely.put all back together and that was it-back to normal-hooray!! have to point out that the van will not rev past 3700 revs when it is loaded-it has a load sensor,unloaded or partly loaded it will rev to I think about 4100 revs(don't quote me on that though) do hope this will help whoever and God bless

Aug 15, 2011 | 2006 Renault 181

1 Answer

Ferrari 360 will not rev above about 1500 rpm. Cold weather around 40 degrees F, but even after the car idled for 10 minutes warmed up to 200 degrees F engine temp the car would not rev above 1500. When...

without my greasy hands under the bonnet its hard to say but dont be scared of it just because it say ferrari on the front its still made by fiat and uses a lot of common parts ,now what i would do here is to test the mass air flow sensor with my automotive tester to see what happening and if the voltage is varying as it reved up before i start to even think about changing anything ,if this sensor is faulty then its not measuring the right air flow which will not allow petrol to be injected through the injectors hence its not picking up and i think it may be the cold weather thats affecting the sensor in some way ,remember warming up the engine will not make the sensor warm as it still has cold air being drawn in through the inlet pipe

Jan 24, 2011 | 2003 Ferrari 360 Modena

1 Answer

I have a 96 chevy 1500 w a vortec 4.3L engine. Starts good and runns good until it warms up! After that there are multi misfires and will almost die! We have change the fuel pump, fuel filter, plugs,...

Here is some ideas coil pack, out of time, new wires, dist.cap, throttle position sensor, idle control valve, or take you air hose from air filter and check the wire screen inside you mass air flow sensor and make sure it's not plugged. That year of truck can be checked with a obd scan free at Auto Zone or Advance Auto Parts.

Jan 09, 2011 | 1998 Chevrolet C1500

1 Answer

94 Bravada that stumbles and stalls.. won't start when warm..

Try checking the exhaust flow when someone else is pushing down on the gas petal.The farther the petal gos down,the more exhaust should be coming out. I replaced my catalitic convertor at 44000 miles, it was clogged. I had them install a high flow type.

Sep 03, 2009 | 1994 Oldsmobile Bravada

1 Answer

2004 jeep grand cherokee. CO2 sensor code, car will not start.

O2 sensors play no role in the startup of a vehicle, they do not contribute until after the vehicle has warmed up and reached "closed loop" status which is usually at least 150 degrees coolant temp

Apr 03, 2009 | 2004 Jeep Grand Cherokee

2 Answers

87 RX 7

rx7`s should rev to 3000 when started cold then it should settle to 750 to 1000 after about 30 to 60 seconds.
mine suffers a similar problem. so far I have been told various answers, mostly involving the bac valve, lambda sensor, air flow meter, etc. try starting of by adjusting the idle adjust screw (on top of the throttle body under plastic cover) this may be all it is. I have not had time to do mine. Its been fine otherwise and idles fine after a few minutes. mine is non turbo 87.

Jun 04, 2008 | 1987 Mazda RX-7

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

159 people viewed this question

Ask a Question

Usually answered in minutes!

Top Dodge Experts


Level 3 Expert

76164 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22156 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

8273 Answers

Are you a Dodge Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides