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Old 01-23-2013, 12:09 PM   #1
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Misfire

I just got back from basic training and fired up the stang when I come home. I had just done the gt40 swap on it about a month before I left. When I started it up it had an exhaust leak a vacuum leak could be heard and it was running extremely rich ntm it was misfiring when cold and driving. has a rough idle and itll surge for a moment before settling down. Could all of these things cause a miss? Also could o2 sensors be causing problems? It doesn't miss when warm except when cruising down the road in the low rpms you can feel the car miss like out of nowhere. It's really bothering me. Has all brand new ignition parts except for the distributor itself.
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Old 01-23-2013, 12:19 PM   #2
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Is it throwing any codes?
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Old 01-23-2013, 04:58 PM   #3
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Yeah I went and had it scanned and it said it was reading lean at partial throttle?
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Old 01-24-2013, 12:53 AM   #4
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I've been reading up on some things and I'm thinking I'm going to start with the maf sensor and also the PCV is leaking oil so ima change it too cause it said that it could also cause some problems like what I stated.. Hopefully it works out.
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Old 01-25-2013, 08:27 AM   #5
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Hey man let me know who this goes I think I am having problems with my maf to but my is a 94 so I can't scan for codes when light comes one and then sometimes the light will go away
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Old 01-25-2013, 09:38 PM   #6
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Hey man let me know who this goes I think I am having problems with my maf to but my is a 94 so I can't scan for codes when light comes one and then sometimes the light will go away
You can check the codes on an obd1 car. Do a quick google search and you will find an article on how to do it. Its pretty easy
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Old 01-31-2013, 07:11 PM   #7
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It did turn out to be the maf sensor. Cars runnin a whole lot better but still has the surging idle issue at cold Start.
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Old 01-31-2013, 08:08 PM   #8
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It did turn out to be the maf sensor. Cars runnin a whole lot better but still has the surging idle issue at cold Start.
Clean your IAC would be a good place to start on that issue.
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Old 01-31-2013, 08:26 PM   #9
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Ok ill do that. And another thing.. Idk what the hell it is but there's a rattling noise from underneath the hood it comes and goes. It doesn't go up with increase of rpms.. Could something have gotten loose? The car is dumped and it has shaken stuff loose on the inside of the car. Have any of y'all ever experienced this?
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Old 01-31-2013, 09:12 PM   #10
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Ok ill do that. And another thing.. Idk what the hell it is but there's a rattling noise from underneath the hood it comes and goes. It doesn't go up with increase of rpms.. Could something have gotten loose? The car is dumped and it has shaken stuff loose on the inside of the car. Have any of y'all ever experienced this?
Old cars rattle, I tore apart my interior... you wouldnt believe the weird **** i found after 5 owners
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Old 01-31-2013, 09:27 PM   #11
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That doesn't suprise me. It's just weird cause youd think it would do it all the time. But it doesn't.. Idk but what do you use to clean your iac?
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Old 02-01-2013, 03:09 AM   #12
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You can use carb spray. Make sure it is fuel injector safe.
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Old 02-01-2013, 06:23 AM   #13
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Ok thanks man
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