Code 157/158 headache

[lild123]

Howdy! New to the forum and I have an issue I was wondering if I could get some help on. Recently I had code 157 for the MAF pop up and I replaced the sensor twice and cleaned the IAC to no avail. I eventually replaced the computer and now it gives me both codes 157/158 and a new code 213 After changing out the EEC. i used to have code 998 failure mode but it went away after installing the new EEC .When you start driving it the MAF codes appear but at idle its fine . What do you all think it might be? Thanks in advance for the help!

 

[Centaurious]

If you are getting both a 157 and a 158 I would start inspecting the engine wiring harness starting with the MAF plug and working along until I found the abraded spot as it sounds like the wires are shorting to ground. 213 may be related.

 

[Roont]

Also what are your trims? Could be it is doing its job and there is unmetered air getting in there somewhere?

 

[lild123]

Also what are your trims? Could be it is doing its job and there is unmetered air getting in there somewhere?

Excuse my ignorance, what do you mean by trims?

 

[lild123]

Tested the voltage today and came back with this
Voltage wire 11.55
Constant Ground 0.05 ohms
Signal wire 0.70 1000 rpm idle and increases with throttle

 

[Roont]

Your fuel trims.
That can point you to either an electrical issue or an air issue.

Does your scanner have freeze frame info? If not, I believe auto zone scanner does and if you post your freeze frame information here we can help you narrow down where to start looking. That will save you a lot of time rather than guessing and throwing parts and computers at it

 

[lild123]

Your fuel trims.
That can point you to either an electrical issue or an air issue.

Does your scanner have freeze frame info? If not, I believe auto zone scanner does and if you post your freeze frame information here we can help you narrow down where to start looking. That will save you a lot of time rather than guessing and throwing parts and computers at it

I don't have a OBD-1 scanner and i don't believe auto zone does either. where should i start with the fuel trims?

 

[Roont]

Where are you located?

 

[lild123]

Where are you located?

Tennessee

 

[Roont]

This puts us back to Centaur's suggestion. Google which pins on your eec are the maf signal and google how to do a voltage drop test. This will quickly show you what is going on with the wiring.

Also see if the ignition wires share a ground or harness with that maf wiring.

Sounds like the wires may be snuggling a bit too closely.

Also make sure the maf ground is perfect as there is no wiggle room with that sensor. It may share a ground with a pile of wires.

 

[lild123]

Figured I’d chime in after all this time. It ended up being the pcm

 

[Centaurious]

Thank you for your reply. Every solved problem provides clues for others who are fighting similar problems.

 

[lild123]

Thank you for your reply. Every solved problem provides clues for others who are fighting similar problems.

Yea sir, it was a hard stuck code wouldn’t go away I bought a used ecm for cheap on partsmarket and sure enough it fixed it.
Edit: had I remembered this thread sooner I would had posted my success earlier

 

[Roont]

The answer is always appreciated! I have spent many a time finding an exact issue someone posted years before but they never returned to post the resolution haha. Makes me go nuts