Read fault codes, need advice
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Freshman User
Joined: Jul 2000
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From: Iowa
Read fault codes, need advice
I just read the fault codes on my '91 150 5.8l auto XLT 4x4 Ext cab. I've only run the ingnition on, truck not running test so far. I got a 67...Neutral Drive switch system fault/PNP switch open. Also got a 334...EGR closed valve voltage higher than expected.
Here's my question;What problems or potential problem are these fault codes causing me?
Question 2 what are the top two or three power/mileage ehancing projects for this truck?
Thanks, Kurtis
Here's my question;What problems or potential problem are these fault codes causing me?
Question 2 what are the top two or three power/mileage ehancing projects for this truck?
Thanks, Kurtis
Freshman User
Joined: May 2000
Posts: 32
Likes: 0
Read fault codes, need advice
The list that I have for 67 is
Park Neutral Position Switch circuit open - A/C on.
Did you do the test with the Air switch on??
The 334 is listed as EVP sensor is/was high. Is this a hard fault or just in memory. When you flash the codes you get 2 sets of codes. The first is hard faults, meaning that the sensor is reading high now. The second is a memory fault, meaning that it was high. This could be a bad connection to a sensor that does read some of the time.
Park Neutral Position Switch circuit open - A/C on.
Did you do the test with the Air switch on??
The 334 is listed as EVP sensor is/was high. Is this a hard fault or just in memory. When you flash the codes you get 2 sets of codes. The first is hard faults, meaning that the sensor is reading high now. The second is a memory fault, meaning that it was high. This could be a bad connection to a sensor that does read some of the time.
