Rough idle and rough running only when cold?

Rough idle at engine start for 1 or 2 minutes, then runs fine all day ...

Based on my limited experience, common reasons for rough idle when cold include: Vacuum leak at intake manifold that closes when metal warms up.

Rough Idle on cold start : r/jetta - Reddit

During cold start, the vehicle runs rough because it's unable to compensate for the change in air flow. When the vehicle begins to warm up, it's ...

Why does my car idle rough on a cold start? - Quora

Rough IdleIf the car starts when cold but, idles rough or does not want to stay running, this can indicate a problem with the engine temperature ...

Rough idle when cold | BobIsTheOilGuy

I had a vehicle with that problem.It would spit and miss when cold then run fine when warm.Turned out it was the intake valves caked with ...

Rough idle only in cold weather | Toyota Nation Forum

a wiring / loose connector, or other issue with the Engine Coolant Temp (ECT) sensor, or Air Intake Temp (AIT) sensor are things I would check ...

My Car Has a Rough Idle When Cold: 6 Possible Causes - HubPages

One of the most common causes of rough idle on a cold engine is a faulty ECT sensor. This sensor signals the car's computer when the engine's ...

Rough idle smoothes out when warmed up - IH8MUD Forum

Engines need to run rich when cold, so the ECU dumps more fuel into the engine than is actually needed until it warms up, think of it as full ...

3 Things to Check if You Have a Cold Start Rough Idle - YouTube

Welcome! Here are the parts I used in this video: Delphi MAF Sensor: https://amzn.to/3X366kB Map Sensor: https://amzn.to/3ZpZvSO Intake ...

What Does It Mean If My Car Shakes While Idling? | Hollenshade's

Rough idle is easy to detect when you start your vehicle, and it may be dependent on the engine temperature when you start your car. A cold- ...

Q&A: Troubleshooting Rough Idle on Cold Start | JustAnswer

This could be an airleak after the airflow meter, any air dragged in here isn't 'seen' by the ECU and so not compensated for and can lean the engine out ...

Rough idle when the engine is cold only | EricTheCarGuy

A few other things to look into are the following: TPS (Throttle Position) Sensor, EGR Valve malfunctioning, a bad PVC valve, M.A.P. Sensor, ...

Engine idles very rough after cold start in colder weather - GenVibe

Your rough idle morning start problem could be uneven compression in the cylinders. Check the mechanical things first, like the cylinder ...

Rough idle in only cold weather. - GenVibe - GenVibe

Most likely you have a vacuum leak. The intake manifold gasket is suspect. It gets drenched from oil that comes in through the crank case ventilation system ...

Rough idle only in cold weather? Please help | Chevy Tahoe Forum

Intake gasket...mine went bad when my motor was stock. Sounded like it was cammed.. the cold weather makes the gasket hard enough to create the ...

Rough idle on cold starting, with CEL | Honda Element Owners Club

It wasn't the throttle body! Rough-idle-on-cold-start kept recurring. Here's what it was: the engine was slightly low on oil and after I added ...

Rough Idle only when cold. - Honda Odyssey Forum

You may not want to rule out intake/vacuum leaks so quickly. If it is an intake gasket, then it is possible that it will "seal up" as the engine ...

Rough idle at cold start? | Honda CR-V Owners Club Forums

I'd look at the spark plugs, before aiming the Cannon. :rolleyes: Start engine, if running rough, stop immediately and compare condition of ...

question about rough idle on cold start...

this isn't anything new. engines need to warm up to run properly. i suppose everyone has just gotten accustomed to fuel injected vehicles that ...

Very Rough Idle When Cold | Ford Forums

Ok, so it looks like when the ambient temperature drops below about 50 degrees, and the engine has cooled enough to match, that's when it get it ...

Rough idle only when cold start | Toyota Tundra Forums

It's possible that the sensor readings fall off below a certain temp, making the ECM think that the coolant is super cold and richens up the ...