Jolt

Mafia Mustang · Apr 1, 2007

I have an 06 v6 mustang. It was a rental car. I just have one question when im at a stop or rolling , my car jolts alittle bit I was wondering if this is normal or if I have a problem and need ford to check it out. My bf said you guys help him alot on his 5.0 so he let me post this Thanks guys

Jennifer

stanmckinney · Apr 1, 2007

I have never noticed any kind of jolt. Can you be more specific?
I assume the car is under warranty. I'd take it to a dealer and have it checked out.

glewis29 · Apr 2, 2007

Do you mean jolt when you step on the gas? With an automatic mine sometimes does this if I catch it 'inbetween' gears.

DaemonJ · Apr 2, 2007

The 05+ series no longer has a throttle cable but instead uses a "drive-by-wire" system. This system is completely electronic and there is a noticeable lag (about 1.5 seconds) from the time you depress the gas pedal to the time the car responds. Ford states this is normal operation and appears to be true as the Toyota Highlander, which also uses the "drive-by-wire" system has the same complaints.

However, if you have this problem after driving for a long period of time (e.g. on the hwy), then there is a technical bulletin to replace the fuel pump because bubbles will form around it causing the car to buck and/or possibly stall when depressing the gas pedal again after slowing down.

sohcman · May 2, 2007

DaemonJ said:
The 05+ series no longer has a throttle cable but instead uses a "drive-by-wire" system. This system is completely electronic and there is a noticeable lag (about 1.5 seconds) from the time you depress the gas pedal to the time the car responds. Ford states this is normal operation and appears to be true as the Toyota Highlander, which also uses the "drive-by-wire" system has the same complaints.

However, if you have this problem after driving for a long period of time (e.g. on the hwy), then there is a technical bulletin to replace the fuel pump because bubbles will form around it causing the car to buck and/or possibly stall when depressing the gas pedal again after slowing down.

Daemon,

I had my car "fixed" under that TSB, new fuel pump and filter.

It did NOT fix the problem.

After I had installed full duals, the problem went away.

Maybe it is not truely a fuel issue, but a backpressure/computer issue?

Had the pipes on for 3,000 miles and not a single hesitation after pulling off the highway!! Used to bog 1-2 times a day before that.

My $0.02

SOHC

DaemonJ · May 2, 2007

sohcman said:
Daemon,

I had my car "fixed" under that TSB, new fuel pump and filter.

It did NOT fix the problem.

After I had installed full duals, the problem went away.

Maybe it is not truely a fuel issue, but a backpressure/computer issue?

Had the pipes on for 3,000 miles and not a single hesitation after pulling off the highway!! Used to bog 1-2 times a day before that.

My $0.02

SOHC

Luckily the TSB repair did fix the bogging down after a period of hwy driving but the initial lag of the pedal is still there.

I have had true duals since about a week after getting the car and that unfortunately has not made a difference in the initial lag.

A custom tune from my SCT tuner did help slightly but I would definitely like a faster response than what I currently have.

Hopefully a fix for this "problem" can be found soon.

sohcman · May 4, 2007

DaemonJ said:
The 05+ series no longer has a throttle cable but instead uses a "drive-by-wire" system. This system is completely electronic and there is a noticeable lag (about 1.5 seconds) from the time you depress the gas pedal to the time the car responds. Ford states this is normal operation

A second and a half is much too long of a delay.

That could be extremely dangerous in an emergency situation were fast response is needed.

My delay is nowhere near that bad, maybe a 1/4 second or so.

Also, manually downshifting may help.

SOHC

DaemonJ · May 4, 2007

sohcman said:
A second and a half is much too long of a delay.

That could be extremely dangerous in an emergency situation were fast response is needed.

My delay is nowhere near that bad, maybe a 1/4 second or so.

Also, manually downshifting may help.

SOHC

I completely agree and have had it into the service department at least 5 times now. They keep telling me that is normal but I just cannot believe that. I can handle a slight delay but what I have going on is just plain ridiculous. I have almost been in an accident on several occaisions due to the delay.

sohcman · May 4, 2007

Have you tried manually downshifting and hitting the gas at the same time?

Try it out and note the delay.

Take it to a DIFFERENT Ford dealer.

And a different one.

And a different one.

Take a new Mustang off the lot for a test drive with the Service Manager with you.

Compare it to yours.

Don't take no for an answer.

Be safe.

SOHC

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