Rough idle, codes p0 171,174,300

Tiny
#1SAINTSFAN
  • MEMBER
  • 2004 SUZUKI VERONA
  • 2.5L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 174,550 MILES
I have changed the spark plugs, coils, PCV, cleaned the EGR. Check the hoses and still getting rough idle. Help please
Do you
have the same problem?
Yes
No
Saturday, August 10th, 2019 AT 7:44 AM

4 Replies

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Hi,

The 0171 and 0174 are stating both banks are lean. The p0300 is a multicylinder misfire.

I attached a couple guides that will help with this.

https://www.2carpros.com/articles/repair-lean-mixture-codes-p0171-or-p0174-on-some-manufacturers

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

I suspect you have a vacuum leak that may not be a hose. Clearly this is something that is effecting the entire engine which is why both banks are lean. I would suggest taking the carburetor cleaner and spray it around the engine to see where the RPM goes up. More than likely it is an intake gasket leaking. Basically, you have unmetered air coming in somewhere causing it to go lean.

I attached the P0171 code. The P0174 is the same just for bank 2 so I didn't see the need to attach it.

Let me know what you find with this info and we can go from there. Thanks
Was this
answer
helpful?
Yes
No
+1
Sunday, August 11th, 2019 AT 9:16 AM
Tiny
#1SAINTSFAN
  • MEMBER
  • 16 POSTS
Thank you very much.
Was this
answer
helpful?
Yes
No
Sunday, August 11th, 2019 AT 1:59 PM
Tiny
#1SAINTSFAN
  • MEMBER
  • 16 POSTS
I have a new question I also have a 02 saab 9-5 2.3 areo and I changed my fuel pump and the reason I changed it cause my fuel gage would work sometimes then it would drop to empty can you help me do I have a reset the fuses are good and the relays help
Was this
answer
helpful?
Yes
No
Sunday, August 11th, 2019 AT 3:03 PM
Tiny
RENEE L
  • ADMIN
  • 1,257 POSTS
Hello,

Each question thread needs to about one issue. You are asking about a different car with a different issue. Please start a new question so that the site can properly index it. This helps other users coming to site find it with that same car/issue.

Thank you for using 2CarPros and have a great rest of your day!

Renee
Admin
Was this
answer
helpful?
Yes
No
+1
Sunday, August 11th, 2019 AT 6:05 PM

Please login or register to post a reply.

Sponsored links