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Old 01-30-2014, 08:02 PM   #1
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Question Misfiring issue?

Hey everyone,

I currently have an 88' Mustang 5.0 Lx. I've had this misfiring issue but it progressed. I don't really understand if it is progressing because it is simply cold outside (17 degrees) here in NJ or if its because of an idling issue or what. I've included a video below showing the issue (you might have to turn up your volume) and You can actually hear the misfiring/popping sound. A little bit of information: My oil pressure psi was about 47 psi, my water temperature was at about 180(its usually between 180-195, not really sure what it is suppose to be around). My gas was full and my battery was normal it was at the 13v mark I believe(its the longest "-" about 1/4th of the way up from the bottom). I bought the car back in November from an older guy who took pretty good care of it but when I called him he "didnt know anything about it" of course. The car is completely stock besides the BBK Cold Air Intake, short throw shifter, BBK headers, Mac x pipe and I believe mac mufflers. The previous owner said also that the engine had only 100k miles but it just rolled over again and I personally believe it is on 200k but theres no way to tell. I've replaced the Egr valve and position sensor, the fuel filter, the sparkplugs with motorcraft coppers, replaced the igniton wires with auto lights, replaced the distributor cap and rotor with msd and even did a 3g alternator 130 amp swap with the bigger power wire that connects from the alternator to the ignition system. I went to clean out the Idle Air Control valve and it looks almost brand new and didnt have any buildup although i still sprayed it with carb cleaner. I have the speed density system not MAF and i currently have a MAP sensor. The car was in 3rd gear in the video, I was doing 35mph at about 1700rpm and It started misfiring/popping. It used to only do this with the headlights on but now its most of the time, at least once a day. Please ignore my stupid talking toward the end of the video. I included two videos, one while driving and another one with my idle moving around while i was at a stop light.

Thank you for your input.
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Old 02-03-2014, 09:44 AM   #2
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I ran into the same issue with my 90 mustang. My idle issue was due to a vacuum leake and my misfire was due to my distributor set way off. You might want to check all your lines and also make sure your distributor is set at the right degree.
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Old 02-03-2014, 09:52 AM   #3
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Quote:
Originally Posted by wills90mustang View Post
I ran into the same issue with my 90 mustang. My idle issue was due to a vacuum leake and my misfire was due to my distributor set way off. You might want to check all your lines and also make sure your distributor is set at the right degree.
How to I set my distributor?
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Old 02-03-2014, 10:06 AM   #4
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You will need a timing light and if you have not done this before then I would suggest you find someone that has. The process is fairly simple just remove distributor hold down clamp then you can twist the distributor clockwise or counter-clockwise depending on what your current timing is set. For a stock 5.0 it can vary i have heard 10 degrees and also 13-14. Mine was set to 13. There are great videos on how to set your timing online. I would first check for any vacuum leaks.
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Old 02-03-2014, 10:14 AM   #5
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Quote:
Originally Posted by wills90mustang View Post
You will need a timing light and if you have not done this before then I would suggest you find someone that has. The process is fairly simple just remove distributor hold down clamp then you can twist the distributor clockwise or counter-clockwise depending on what your current timing is set. For a stock 5.0 it can vary i have heard 10 degrees and also 13-14. Mine was set to 13. There are great videos on how to set your timing online. I would first check for any vacuum leaks.
How much would a shop charge for this?
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Old 02-03-2014, 10:19 AM   #6
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I am not sure but a buddy of mine had it done for $100.00. But it could be more, it could be less.
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Old 02-03-2014, 10:20 AM   #7
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I would wait and see if someone else replies to this because they might have a better suggestion.
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Old 02-03-2014, 10:31 AM   #8
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Originally Posted by wills90mustang View Post
I would wait and see if someone else replies to this because they might have a better suggestion.
Will do
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Old 02-03-2014, 12:24 PM   #9
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Here is a great site that tells you how to adjust your timing.

Checking, Setting and Bumping up your Mustang's Timing
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Old 02-03-2014, 02:14 PM   #10
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Here is a good link in how to set your timing.

Checking, Setting and Bumping up your Mustang's Timing
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Old 02-03-2014, 02:16 PM   #11
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Try this site to set your timing.

Checking, Setting and Bumping up your Mustang's Timing
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