Ford Mustang Forum banner
Status
Not open for further replies.
1 - 20 of 21 Posts

·
Registered
Joined
·
62 Posts
Discussion Starter · #1 ·
while driving, my car dies when i push in the clutch. it started when i changed from 93 to 87 octane gas. have the sct x3 and changed the tune when i switched gas. idles kind of rough at startup but dies when the rpms slam down from a shift point or when stopping. any advice would be helpful. im 800 miles from home on vacation. im at my destination for a bout a week so i have a little time to work on it.
 

·
Registered
Joined
·
62 Posts
Discussion Starter · #2 ·
also throw trouble code 1290
 

·
Registered
Joined
·
62 Posts
Discussion Starter · #4 ·
would this cause the rough idle and stalling
 

·
Registered
Joined
·
62 Posts
Discussion Starter · #6 ·
no but this has started today. never had this kind of issue till now. also got good gas mileage and still makes good power just when the rpms go from traveling speed to idle does it die
 

·
Registered
Joined
·
62 Posts
Discussion Starter · #7 ·
also worse when the ac is on. dont know if this makes a difference
 

·
Registered
Joined
·
62 Posts
Discussion Starter · #9 ·
done that does it with both tunes. tried raising the neutral idle rpm that seems to help with the rough idle will have to take it for a spin to see if it helps with the comming to a stop problem
 

·
Registered
Joined
·
62 Posts
Discussion Starter · #11 ·
any idea where it is located
 

·
Registered
Joined
·
449 Posts
Yeah, that's convenient to get to while on vacation! "Honey, I'll be in the parking lot of the hotel field stripping the Mustang, go ahead and take the kids to the pool".

Sorry it picked this trip to crap out on you.:frustrated:
 

·
Registered
Joined
·
1,644 Posts
For reference, the PCM normally has to re-learn the idle strategy after a tune is either replaced or reinstalled, or the battery is either disconnected or replaced, all of which can cause idle problems. There is a procedure in the battery section of the owner's manual that is supposed to help the PCM re-learn the idle strategy quicker.
However, in your case it appears that the cyl. head temp sensor trouble code is pointing to the cause of your car's idle problem, as stated by others.
 

·
Registered
Joined
·
62 Posts
Discussion Starter · #18 ·
raised idle rpm. went into failsafe mode about 1/4 mile down the road. needless to say turned right around. is this a dealer item or something i can pick up from autozone
 

·
Premium Member
1965 Mustang coupe
Joined
·
72,229 Posts
raised idle rpm. went into failsafe mode about 1/4 mile down the road. needless to say turned right around. is this a dealer item or something i can pick up from autozone
That is a dealer part. There are two possible part numbers depending on where your engine was built.
Romeo Tag# 5S690, 5S691 -- 4L3Z12A648AB
Windsor Tag# 5S836, 5S837 -- F5AZ12A648AB
 
1 - 20 of 21 Posts
Status
Not open for further replies.
Top