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Codes 44 and 34

Tiny
COOLE041
  • MEMBER
  • 1991 FORD F-150
  • 5.0L
  • V8
  • 4WD
  • MANUAL
  • 135,000 MILES
Just got back from the mechanic. I went in to replace the fuel filter, air filter, exhaust manifold gasket and oil filter. The check engine light never came on before and now it comes on after five minutes of driving. Checked the cold using the old paper clip method and I got trouble codes of 44 as 34. What is going on?
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Friday, July 6th, 2018 AT 6:29 PM

8 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good evening.

I attached the code chart for you for both codes.

34 is usually the EGr valve. If you replace it, make sure it has the position sensor with it.

Roy
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Friday, July 6th, 2018 AT 6:59 PM
Tiny
COOLE041
  • MEMBER
  • 31 POSTS
Okay. Engine gas re-circulation valve. I will get on top of this and are there any other typical causes for this? Mass airflow sensor etc?
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Friday, July 6th, 2018 AT 7:04 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
MAP sensor is common but must be confirmed to be sure. Follow the chart.

Roy
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Friday, July 6th, 2018 AT 7:10 PM
Tiny
COOLE041
  • MEMBER
  • 31 POSTS
Thanks. I will be back soon.
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Friday, July 6th, 2018 AT 7:13 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Sounds good. Keep us updated.
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Friday, July 6th, 2018 AT 7:16 PM
Tiny
COOLE041
  • MEMBER
  • 31 POSTS
So I replaced the EGR today and while I was at I put in a new MAP sensor as well. Also put in the a new position sensor too. The truck I running rougher out of first gear "manual transmission" and the ride seems to be rougher like a choke or hiccup as a accelerate. What are your thoughts on what it could be?
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Wednesday, July 11th, 2018 AT 2:37 PM
Tiny
COOLE041
  • MEMBER
  • 31 POSTS
Also, idle is at 800.
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Wednesday, July 11th, 2018 AT 2:47 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Make sure you have no vacuum leaks.

Check for vacuum to the MAP sensor. Look for any cracked or damaged lines.

Did the codes clear?

Roy
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Wednesday, July 11th, 2018 AT 3:20 PM

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