Codes 44 and 34

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?

Friday, July 6th, 2018 AT 6:29 PM

8 Replies

ASEMASTER6371

MECHANIC
52,796 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

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

ASEMASTER6371

MECHANIC
52,796 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

COOLE041

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31 POSTS

Thanks. I will be back soon.

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Friday, July 6th, 2018 AT 7:13 PM

ASEMASTER6371

MECHANIC
52,796 POSTS

Sounds good. Keep us updated.

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Friday, July 6th, 2018 AT 7:16 PM

COOLE041

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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

COOLE041