New MAF?
Thread Starter
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Fleet Mechanic
Joined: Nov 2007
Posts: 1,993
Likes: 16
From: Colorado
New MAF?
Today I replaced the number 5 spark plug in my Ex. I had the number 5, 4, and 1 COPs off during the process.
When I fired her back up, she ran very poorly and nearly died on me. I looked at the dash and the "Service Engine Soon" light was on. I turned the truck off, made sure all my connections were good, and turned fired her back up again. Same result, so I disconnected the battery for a while then reconnected it, started the truck, and let her run for about 20-25 minutes.
She ran very poorly, and I remembered reading a thread about something similar to this happening to other guys. Their fix was cleaning the MAF, so thats what I did. It did not fix the problem, and the service light came back on.
Off I went to Napa, where one of the employees hooked up his code reader to my truck. I got PO171 and PO174. The guy said his Expedition did the same thing and said the codes were lean mixtures on the left and right banks.
I came home and looked up the codes, confirming what he said. So now I guess I need to order a MAF huh? I think its fairly odd that my truck had been running fine before this dont you?
I just want to know if you guys have any other ideas what might have happened.
When I fired her back up, she ran very poorly and nearly died on me. I looked at the dash and the "Service Engine Soon" light was on. I turned the truck off, made sure all my connections were good, and turned fired her back up again. Same result, so I disconnected the battery for a while then reconnected it, started the truck, and let her run for about 20-25 minutes.
She ran very poorly, and I remembered reading a thread about something similar to this happening to other guys. Their fix was cleaning the MAF, so thats what I did. It did not fix the problem, and the service light came back on.
Off I went to Napa, where one of the employees hooked up his code reader to my truck. I got PO171 and PO174. The guy said his Expedition did the same thing and said the codes were lean mixtures on the left and right banks.
I came home and looked up the codes, confirming what he said. So now I guess I need to order a MAF huh? I think its fairly odd that my truck had been running fine before this dont you?
I just want to know if you guys have any other ideas what might have happened.
Post Fiend
Joined: May 2006
Posts: 10,007
Likes: 4
From: Central Florida
I'd bet you knocked loose a vacuum line. It will show the same codes as an MAF error because the engine is receiving more air the PCM is accounting for.
Get a can of starting fluid or WD40, and spray around the area you were working in with the engine running. When it rev's up, you've sprayed near the vacuum leak.
Get a can of starting fluid or WD40, and spray around the area you were working in with the engine running. When it rev's up, you've sprayed near the vacuum leak.
Thread Starter
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Fleet Mechanic
Joined: Nov 2007
Posts: 1,993
Likes: 16
From: Colorado
Unfortunately I cant give out any rep points right now, or I would.
I went out there, sprayed the WD40 around, and stood there listening. Didnt hear a thing and was about to close the hood, but then I decided to spray it some more.
She revved up a hair which made me spray some more. That did it, so I started really digging around in there and found one vacuum port facing the rear of the vehicle that was without its hose. I found a hose and rejoiced as I went to put it on the port, but alas.... it didnt reach!
Seems that I had routed one line to the wrong port, so I found it and stuck the hoses where they went.
Shes running like she should now guys!
Thanks a ton for the help yo.
I went out there, sprayed the WD40 around, and stood there listening. Didnt hear a thing and was about to close the hood, but then I decided to spray it some more.
She revved up a hair which made me spray some more. That did it, so I started really digging around in there and found one vacuum port facing the rear of the vehicle that was without its hose. I found a hose and rejoiced as I went to put it on the port, but alas.... it didnt reach!
Seems that I had routed one line to the wrong port, so I found it and stuck the hoses where they went. Shes running like she should now guys!
Thanks a ton for the help yo.
