Ford Mustang Forum banner

odd engine behavior

2738 Views 28 Replies 17 Participants Last post by  jasonc32amg
Took the Stang on it's first interstate weekend getaway this weekend. Ran about 2hours up to Canton GA, north of Atlanta. Overall, The car ran great, cruising at 80-90 in the HOV through town. Scarily enough, i was mostly running with traffic.
I had a strange thing happen twice, however. The first time I was headed up Sat, had been cruising 75-80, and downshifted to 4th to get around a slower car in traffic. After the clutch was fully engaged and I was accelating smoothly, it was like the throttle snapped closed for a split second. Even my wife noticed. I thought maybe the AC kicked on or something, but it was a significant punch, nothing the AC should have done.
Coming home yesterday, I had been running 80 coming through downtown and suddenly had to come to a near stop for a wreck. I got down in 2nd and accelated away from the initial slowdown, and it did the same thing again. Clutch was fully engaged, foot away from the pedal, and accelarting briskly, around 3500 rpm. It was a hard, splitsecond, loss of power. It happened so fast I didn't catch if the tach dropped. It was more significant than a cylinder misfire.

I haven't been able to recreate it, and it hasn't happend before.

Anybody else seen this? I got the distinct impression It might be tied to the ETC?
See less See more
21 - 29 of 29 Posts
Same thing on the V6

This is the same problem that occurs on the V6 model. If you want to duplicate your malfunction, just cruise down the interstate for about 30 minutes. Don't make too many throttle inputs, just cruise along. When you get off the interstate and come to stop or almost a stop, the car will fall on it's face and just as quickly recover when you attempt to accelerate. I have played with this problem for a while trying different things to avoid the problem. Here are a few things that prevent the malfunction from occurring; Before you get off the interstate, give your car a full throttle burst, it doesn't have to be a long burst, just open the throttle fully. One other thing is to rev the engine in neutral or clutch in if so equipped, just jazz the engine once and it won't fall on it's face when you attempt to accelerate. What is causing this? No one knows, not even Ford at this point, I have heard that the throttle body is the culprit, but this has not been confirmed, the throttle bodys have been replaced as a shot at the problem by a few techs, as posted on other boards, but so far nothing definative. Problem is we Mustang owners tend to live with minor problems instead of reporting them, this gives Ford the impression that this particular problem is not very wide spread. So it gets a low fix priority if it gets addressed at all. Bottom line is; if your car does it once it will do it again, LET FORD KNOW, before you get rear ended because the guy behind you didn't expect you to accelerate and then almost come to a stop in front of him because your Mustang forgot how to go for a split second.
See less See more
Is there any update on this? I just had it happen to me and it's total BS.
Sounds like TSB 06-9-9. Have an '06 GT that did the same thing. Took it to the dealer and had them do the TSB and all is well again. No more "hesitation after long cruise".

Here is another thread: http://www.allfordmustangs.com/forums/showthread.php?t=48592&page=8
How/ where can I get a copy of TSB 06-9-9? I went on my first road trip last weekend I experienced some hesitation when trying to down shift and pass. I wrote it of to new car and the computer getting up to speed with my driving style, then I read this. I only have 600 miles, what do you guys think?
See less See more
ATXSilverGT said:
How/ where can I get a copy of TSB 06-9-9? I went on my first road trip last weekend I experienced some hesitation when trying to down shift and pass. I wrote it of to new car and the computer getting up to speed with my driving style, then I read this. I only have 600 miles, what do you guys think?
http://www.2005stang.com/gallery/alb...20cru ise.pdf
See less See more
Thanks much, I'm going to contact them Monday.
Exact same thing happened to me 2 months ago, TSB 06-9-9 done no more problem.
Mine does the same thing, I guess when I take it in for the DIFF and the 10" ground to ground stripes($350) I'll get them to take care of that too...
Thanks! This would be a bad problem to have under boost...
21 - 29 of 29 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top