Runs Rough when Cold

Rough Idle on cold start : r/jetta - Reddit

The build up is on the intake valves, which causes insufficient/inconsistent air flow into the cylinders. During cold start, the vehicle runs ...

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

It could be running lean due to low fuel pressure, etc or there could be a problem in the electrical system such as the spark plugs may be ...

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 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 ...

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 ...

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

The most common suspects are the ECT, IAT sensors, and cold start injector. You can start here, and download trouble codes form the computer memory.

Rough idle when cold | BobIsTheOilGuy

It sounds like it is misfiring with a loud sound in the exhaust (or intake?) like a backfire when rpm is higher during warm up. It almost stalls sometimes.

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 ...

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 idles very rough after cold start in colder weather - GenVibe

If your lean code is P0171, it is definitely due to the intake manifold gasket not being replaced. Replace it, and most if your rough idle issues should go ...

Runs Rough when Cold - Hot Rod Forum

As a general rule, the engine needs to be much richer when it is cold than after it warms up. The good thing is that an engine will idle with a ...

CAR ROUGH start when COLD? EXPERT Q&A on ENGINE ...

The engine moves and there up to three jolts before it settles in. After running the car for awhile the starts seem normal and precise.

Why a Cold Engine Runs Poorly | Hot Rod Forum

The main reason for a choke, and the reason why it run so poorly when cold is from a phenomenon called fuel puddling or fuel shear.

Engine runs rough when cold. No check engine light.

As cheap/easy as they are to replace, I would do the plugs and fuel filter. I'd also test/check your charging system (battery cable tighness/cleanliness and ...

Car runs rough when cold - Maintenance/Repairs

Open the hood, and on the right side (passenger side) of the upper intake manifold you'll see the cold-start injector. That injector may be ...

Rough idle when cold, perfect when warm? - ThirdGen.Org

When its stone cold, snap the throttle open and see how far the choke plate closes - should have a gap somewhere between 1/8" to 1/4" to the choke horn.

Running rough on cold starts | Jeep Wrangler TJ Forum

The engine runs rough after starting up until it has warmed up. There's no power under acceleration, and it will buck when given gas.

Need help cold start rough idle! | Polaris RZR Forum

I haven't fixed the cold start issue - its a factory tune open loop fueling problem. The colder it gets and the higher in altitude you go, the ...

Car runs rough when the engine is cold - Ford Taurus Forum

The issue goes away when the engine is back to warm. So when the temperature gauge points to normal, the car runs smoothly and I don't hear any noise any more.

runs rough only when cold. | Suzuki Forums

The car needs extra air at cold start - normally when you start, the throttle opener behind the throttle body opens for about 5-10 seconds. Idle is about 2000 ...