Tin bin new to forum.80 series issues where to begin?

Joined
Apr 3, 2022
Messages
4
Location
arizona
Bought my 80 in Nevada. Has all emissions accessories.

Problem is fast idle and check light. Don’t know how to pull codes.

Replaced torn air cleaner hose, replaced a few vacuum lines that were torn, replaced o2 sensors. Cleaned aic, checked afm, noticeable change from rough to smooth idle after replacing o2 sensors. That is where I am at. That pesky light continues to rent space in my mind. I have disconnected battery for a period longer than a half hour. Light does turn off then comes back after about 50 miles highway and some city driving.

Where to start trouble shooting?

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Joined
Jul 17, 2018
Messages
1,646
Location
LUGOFF, SC
From the grill, it looks like and OBD1 rig, the FSM manual will tell you how to pull the codes and what they mean.
You're starting on the correct path, anything rubber under the hoods needs changing.
If you look up Base Lining in search you'll find a bunch of threads. Its gets your rig to a known level of maintenance.
 

baldilocks

Battle Ground, WA
GOLD Star
Joined
Jan 29, 2014
Messages
7,970
Location
Battle Ground
When did the high idle and DTC light begin and did they happen at the same time? Background info is helpful to the community here.
 
Joined
Apr 3, 2022
Messages
4
Location
arizona
Download the FSM and learn how to read engine codes. Also, mention the year of the vehicle because we have no idea what you bought.
Po71. Egr is the code I’m getting. Supposedly there is no egr available for this truck.
 

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