rough idle in morning - Engine ODB2 Fault Codes


	Auto Repair Home	SEARCH POSTS	WHO'S ONLINE	LOG IN

Automotive Repair

Car Troubleshooting Topics
  Car Troubleshooting
  Engine Troubleshooting
  Engine Fault Codes
  Electrical and Wiring
  Transmission Problems

Car Repair Topics
  Car Making Noises
  Car Stereo Repair
  Heating or AC Issues
  Motorcycles and ATVs
  Tricks of the Trade
  Truck Repair Advice

Site Options:
  Login
  Sign up here!

Latest Forum Post

Camshaft Adjuster - Car not starting

Mercedes s500 2017 - I am reaching out t...

Door locked shut

Hello, New here and really nee...

Hey, I'm Brandon – Questions About Keyless Ignition

Hey all, I’m Brandon! Just a car enthu...

Can't drive out nut from steering knuckle

2005 FORD MONDEO III Stationwagen (BWY) ...

2001 Chevy Cavalier 2.2L automatic radiator fan not running

2001 Chevy Cavalier 2.2 L , radiator coo...

SPRING TIME. TIME TO CHECK YOUR SPARE TIRE

Take your tire out, inspect the tire and...

2011 Honda Pilot Sideview Mirror Compatibility

Hello, I just bought a 2011 Honda Pilot...

Mitsubishi Lancer 2008 2.0 DID Fuel Pump Problem

I moved my car and after 2-3 hours I sta...

Question about my Alternator on a Nissan

2002 Nissan Sentra 1.8L, 210,435 miles ...

Going to school to become a mechanic. I need help understanding the vacuum modulator.

I've done my research and asked my teach...

rough idle in morning

Sign up here!

Search for (search options)

Auto Repair Home>> Automotive Repair>> Engine ODB2 Fault Codes

jimmyd
New User

Nov 5, 2011, 3:07 PM

Post #1 of 3 (2599 views)

rough idle in morning	Sign In

I have2003 chevy silverado, 1500,0 5.3, 95,000 miles. #1 issue is in the mornings now that it's colder it starts fine but idles very rough, sounds like it wants to die. After it warms it's fine all day. Check engine light came on and was read to have error codes P0171 and P0174. Could it be MAF sensor causing morning problem? I had fuel pump replaced last month that took care of some performance issues and hard starts i was experiencing.

Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Nov 5, 2011, 3:40 PM

Post #2 of 3 (2575 views)

Re: rough idle in morning	Sign In

You have a lean condition. There are dozens of ways for that to happen. You need to start looking for air or vacuum leaks first.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.

Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

Nov 5, 2011, 4:06 PM

Post #3 of 3 (2569 views)

Re: rough idle in morning	Sign In

Need to look at the freeze frame data to see when the lean codes set.

Some of these problems are hard to diagnose without some data stream information as the problem is occurring. You can also monitor misfire counts to see if it is missing in any particular cylinder, but you need an enhanced scan tool. What is the fuel pressure when the engine is running rough? Just cause you replace the pump doesn't mean you couldn't still have a fuel delivery issue.

Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on Nov 5, 2011, 4:07 PM)

Search for (options) Privacy Sitemap