Check Engine Light Results....help?

[Greg5567]

So my truck has been sounding pretty bad lately, like it wants to explode whenever I gas it. After it heats up and runs for a little bit, it will run like it used to (still had a check engine light, but it actually ran)

I took it to PepBoys to get codes pulled and this is what it came up with..

Key On Engine Off Test - KOEO
158 Mass Air Flow (MAF) Signal Too High
171 EGO Switch At Adapt Limit Bank 1
172 EGO Not Switching, Lean Exh Bank 1
173 EGO Not Switching, Rich Exh Bank 1
181 Cruise Rich Limit Bank 1 Still Lean
189 Cruise Rich Limit Bank 2 Still Lean
536 Brake On/Off CKT Fault


KOER - Key On Engine Running Self Test
536 Brake On/Off CKT Fault


1994 Ford Ranger XLT 4x4 -- 4.0L V6



Could anyone give me some information, anyone maybe had the same problem?

 

[fireguy12117]

Check for any vacuum leaks either visually, audably, with a vacuum gauge to see whats goin there. a vacuum leak can wreak havock on air fuel mixtures.

there are many different opinions about using brake fluid or some other chemical to try to check for leaks...so that said, ive personaly used a butane torch cranked open and poked around all the vacuum lines, but the best thing is to get a gauge.

if vacuum checks ok, start looking at wiring harnesses and grounds. i have a 93 truck thats had all kinds of electrical bugs and ive since redone all the ground points i can find, and it also had a very badly deteriorated engine wiring harness. not saying thats your case, just that with that many codes it doesnt seem like 1 componant is causing an issue.