troubleshooting - Ford Mustang Forum
 
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post #1 of 7 (permalink) Old 11-27-2014 Thread Starter
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troubleshooting

Hey everyone, wanting to see if someone can trouble shoot this with my 2007 v6. Going about 75 mph, stomped gas down and quickly let off. CEL came on. Got home and ran the codes. Said running lean. Disconnected the battery, then let it sit and reconnected. Turned it on, no codes. Car sat for about 2 hours. Decided to try and drive it. RPMs won't go above 4k when driving. Car is super "loose", speedometer is barely climbing up even though I'm clearly going fast. I can smell some richness, and I may be paranoid, but hear a clicking in the valve covers. I'm sure it's been there before, but like I said, paranoid. I'm not sure what to think. Not throwing codes. Fuses are fine. MAF looks good. I'm also not running any tunes. Idling about 750. No surges. Does bog down a bit on start up, but idles fine. Any ideas? Vacuum leak maybe?

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post #2 of 7 (permalink) Old 11-28-2014
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Originally Posted by Jlopez07 View Post
Hey everyone, wanting to see if someone can trouble shoot this with my 2007 v6. Going about 75 mph, stomped gas down and quickly let off. CEL came on. Got home and ran the codes. Said running lean. Disconnected the battery, then let it sit and reconnected. Turned it on, no codes. Car sat for about 2 hours. Decided to try and drive it. RPMs won't go above 4k when driving. Car is super "loose", speedometer is barely climbing up even though I'm clearly going fast. I can smell some richness, and I may be paranoid, but hear a clicking in the valve covers. I'm sure it's been there before, but like I said, paranoid. I'm not sure what to think. Not throwing codes. Fuses are fine. MAF looks good. I'm also not running any tunes. Idling about 750. No surges. Does bog down a bit on start up, but idles fine. Any ideas? Vacuum leak maybe?
It would have helped to know what the exact code is.

Did you try cleaning the MAF? How about the Throttle body? Getting a wrench light? When was the last time u put plugs in it? Fuel filter?

-Matt


I'm not a "tuner", I am a ecu software engineer. Its different.

2011 GT500 = It gets me from A to B

If you want good technical help. Put your Year, trim, engine, and PCM code in your post! Its easier that way
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post #3 of 7 (permalink) Old 11-28-2014 Thread Starter
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I believe it was P0171/P0174. FuEl filter changed in April. Plugs last year in October. Car runs and it doesn't smell rich or anything, but when driving my speedometer barely climbs and then slowly goes down when applying the break. I knew I hit about 40 mph and the speedo was around 30 mph and then slowly dropped down when I stopped.
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post #4 of 7 (permalink) Old 11-28-2014 Thread Starter
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Also not throwing any codes. MAF sensor was cleaned and all fuses were fine
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post #5 of 7 (permalink) Old 11-28-2014 Thread Starter
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From reading other posts and things, I'm starting to think that it's just my speedometer. Maybe it shorted out?
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post #6 of 7 (permalink) Old 11-29-2014
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That's entirely possible and might explain your tachometer as well. Failed stepper motors in the 2005 to 2007 Mustangs are a known problem. If you have some basic soldering skills, you can replace them relatively cheaply. There are several people selling them on Ebay and there are YouTube videos on the procedure.
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post #7 of 7 (permalink) Old 11-30-2014 Thread Starter
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So here's the the update. Car is perfectly fine lol. Somehow everything is acting normal.
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