Replaced alternator then started it back up. Started idling rough and the check engline light came on. The engine is a 5.8l. Pulled the codes and got 'P1131 P1151 P0136 3 INC CATLYST 02 SNSR 02 HTR 4 READY MISFIRE FUEL COMP EGR MAF". Cleared the code restarted the engine, a few minutes later the check engine light came on again and pulled the same codes.
Sounds like you got a smaller amped alt then what was there.
SOURCE: 1999 Ford Escort idle problems
you need to look for a vacume leak thsi would also make your IAC valve go beyond range.good luck
SOURCE: P0401. P0133, P1131- emmision test
Based on what the tech manuals say I would change the DPFE sensor for the EGR Valve, careful not to tear the special silicone rubber hoses that go to it from the exhaust, as a Ford dealer tech I saw these codes allot, and the DPFE sensor was almost always the issue or the hoses going to it.
SOURCE: 98 E-250 Rough Idle; codes p0156,p1131,p1151,p0301,p0171,p0174+
po301 thru po306 all misfire codes cylinder 1-6 remove plugs and replace them..... set the plug gap first
i suggest u replace the wires also if they never been replaced all these misfire codes can set the others and one is for the oxygen sensor ( 02s or HO2S) CIRCUT MALFUNCTION do u know how to check wireing systems
do the tune up plugs (set gap) .052-.056 change the fuel filter also. clear the codes hows it run
this info is for 98 E-250 4.2Litre
what engine do u have 4.2L or 4.6L i know it is a v-6 by the codes
SOURCE: P0136, P1131, and P1151 codes on Ford Expedition 2000 4.6L
Your auto has four O2 sensors. Two upstream and two downstream; With two banks. Bank 1, sensor 1...and bank 2, sensor 1 are the two upstream (exhaust manifold before the catalytic). Bank 1, sensor 2 and bank 2, sensor 2 (other side of catalytic)
Code 1131= upstream; bank 1..sensor 1
Code 1151= upstream; bank 2..sensor 1
Code P0136 (generic code) bank 1..sensor 2 (questionable)
I wouldn't spend the money to purchase 3 sensors. Highly unlikely all three are bad; Cost is about $40/ ea.
Since there isn't a code for the cat's themselves, I would suspect the O2 circuit is malfunctioning. The rough idle is another clue.
Take an ohmmeter set it on X10 scale and measure the resistance from engine to body and body to negative post on battery terminal. You should read zero ohms (full needle deflection). If you do go buy two upstream O2 sensors. If you read
open or a high resistance run two straps from eng. to body...and body to neg.batt. post.
FixYaWIZ................saailer
I’m happy to help further over the phone at https://www.6ya.com/expert/david_6df67de3b14de867
SOURCE: 1997 Mustang Cobra (4V, 4.6L), rough idling, won't stay running
silly question, however did you check the air box for nests. it is not uncommon for rodents to climb in and make themselves at home. i would also say to get a maf from ford. check ALL around the engine compartment and underneath for evidence of rodents and their leavings. youll be very suprised what you may find.cheers
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