High speed coasting issue - Mustang Evolution

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Old 09-30-2012, 09:56 PM   #1
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High speed coasting issue

Recently my car started dying after cruising at 70-80mph then putting it in neutral, I have a tune but never really had this issue, I had it b4 where it wouldn't idle while coasting to a stop light after I installed the tune but I addressed that by reinstalling the tune.
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Old 10-01-2012, 05:43 AM   #2
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I have the same issue, I took a trip to Florida from BR this past summer and first noticed it when I went to exit. Set the cruise around 85-90 and when I slowed to a stop it would shut off, I would have to restart it every time. It happened again this past weekend on the way to a wedding, I had the cruise set at around 70 and every time I slow to a stop out of cruise I would have to crank it. I just got a CST tuner this past week so being that it happened this past summer I don't blame it on the tune. I would love to know why it does this also… I have a Passport Qi45 in dash radar detector hooked up to the kick panel on the passengers side, I'm also having issues with low voltage, wonder if that has anything to do with the cruise problem? Figured maybe I'm pulling to much power when it's cruising with the radar detector and the shaker system??
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Old 10-01-2012, 08:32 AM   #3
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Well my battery is pretty weak since it was drained but idk what it is then if you had the same problem with out a tune
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Old 10-01-2012, 11:16 AM   #4
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Maybe the famous alternator problems with these cars? I have not experienced any problem with my stock one but have heard of the stock alts having issues. During cruising when the rpms are high it consistently charging the battery. When the rpms drop the charge gets weak. Had the same problem with my GFs Pontiac. It would die randomly while she was driving.
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Old 10-01-2012, 12:58 PM   #5
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Quote:
Originally Posted by MavyMav
Maybe the famous alternator problems with these cars? I have not experienced any problem with my stock one but have heard of the stock alts having issues. During cruising when the rpms are high it consistently charging the battery. When the rpms drop the charge gets weak. Had the same problem with my GFs Pontiac. It would die randomly while she was driving.
Wouldn't it run off the battery then and the charge light come on?
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Old 10-01-2012, 02:44 PM   #6
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Quote:
Originally Posted by BaSohol

Wouldn't it run off the battery then and the charge light come on?
You are correct. I was just throwing out an idea for you. Is it sputtering or anything or just straight shutting off when you let off the gas?
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Old 10-01-2012, 02:58 PM   #7
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On second thought there is a TSB for the fuel pump after long cruises.
Try replacing the fuel filter and running some cleaner through it.
Also check you intake for leaks and around your MAF sensor. You could be choking the car.
And possibly it could be something with you IAC or EGR but chances are that it is one of the above.
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