EEC-IV/ OBD1 code help

[Bgunner]

I got the codes. I recorded it this time so I could verify. Here’s what I read: 335, 335, 1, eight codes, repeated eight codes. What does the one mean?

Not sure if you meant to put 335 twice or there is s typo but 335 is EGR (PFE) Sensor voltage out of range

 

[Chapap]

Here are the codes and my notes. It repeats everything after the 1, so I just left those off. Yes the 335 is flashed twice in a row.

335 EGR out of range
335 EGR out of range
1
118 ECT high or open- no clue
157 MAF low/grounded- not sure
158 MAF high/short to pwr- not sure
173 O2 sens not switching, iswas rich- new sens?
179 fuel system rich at part throttle- already have new injectors and press regulator
218 idm open or high, left coil pack fail- have new coil pack, other than that idk
332 EGR did not open for test or something
336 PFE high- no clue

 

[Bgunner]

118 Engine coolant temp sensor high or open, this would mess with the fuel mixture potentially causing the O2 sensor errors and a rich mixture.

I would start there...

 

[Chapap]

118 Engine coolant temp sensor high or open, this would mess with the fuel mixture potentially causing the O2 sensor errors and a rich mixture.

I would start there...

mans that’s a stored code? I replaced the sensor already (the 2 pin computer sensor, not one pin dash sensor). Should probably clear codes. Does disconnecting battery clear codes?

 

[fastpakr]

If you've already repaired some of the codes, then I'd focus on replacing the DPFE and then clearing everything. Check them again in a few days to see if anything new is in the system.

To clear them, IIRC you just disconnect the code reader mid test. But I'd search that info to confirm.

 

[Chapap]

If you've already repaired some of the codes, then I'd focus on replacing the DPFE and then clearing everything. Check them again in a few days to see if anything new is in the system.

To clear them, IIRC you just disconnect the code reader mid test. But I'd search that info to confirm.

ah I didn’t even know about the DPFE sensor. What about the EGR valve and solenoid? Would that be suspect after the DPFE?

 

[fastpakr]

Possibly, but the DPFE sensor is so amazingly common that it's one of the few things I'd ever replace based on a code alone. Double check the vacuum lines between it and the exhaust manifold, but if they're good I'd put in a new one (preferably motorcraft).

 

[Chapap]

So I changed the DPFE sensor, EGR valve, and solenoid. I tested the valve with a nearby vac line and it made some crunchy, clicky sounds. I figured it was a problem. I reset codes and almost everything checked out for the 20 min trip I took. 179 (rich at part throttle) popped back up. I already put in a new O2 sensor so I have further reading to do.