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Engine revs and tries to lunges when applying the breaks

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Miller_82
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Joined: Wed May 22, 2019 4:43 pm

Engine revs and tries to lunges when applying the breaks

Post by Miller_82 » Wed May 22, 2019 4:50 pm

It doesn't do it all the time but when your applying the breaks to come to a stop some times the engin will rev and car lunges forward..I'm thinking it might be something with a vacuum line going from the booster to the throttle body.. any other advice is much welcomed and appreciated

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mmsstar
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Re: Engin revs and tries to lunges when applying the breaks

Post by mmsstar » Thu May 23, 2019 4:26 am

More than likely you are “fat footing” the gas pedal when you hit the brakes
Drove an 06 LTD FWD from July 08 to August 10, moved on to a 2011 Flex

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jas88
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Re: Engin revs and tries to lunges when applying the breaks

Post by jas88 » Thu May 23, 2019 5:36 am

Agree with mmsstar, I have done this myself. Otherwise, you would need to clean your TB.
2006 SE Silver w/Slate cloth

danpacheco
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Re: Engine revs and tries to lunges when applying the breaks

Post by danpacheco » Thu Jun 27, 2019 4:42 am

my daughters did this and it was the motor mount on the top of the engine. the rubber was all rotted away. we replaced it and the issue went away.

BoyMom73
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Re: Engine revs and tries to lunges when applying the breaks

Post by BoyMom73 » Sun Jun 30, 2019 12:20 pm

@danpacheco: My upper motor mount is also toast, but my mechanic said it shouldn't cause any real issues... Any idea how the two could be related? I was thinking it sounded like the throttle body needs to be cleaned from the first few threads I read.

Willass Maximus
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Re: Engine revs and tries to lunges when applying the breaks

Post by Willass Maximus » Thu Jul 25, 2019 3:49 pm

Starting to have this problem myself while throwing P061B P2106 codes. Also have had another code P0193 that has been on for as long as I've owned the car.

Confirmed not fat footing since I replicated it very consistently with what my wife told me just in the driveway. It seems to have the greatest effect while I'm shifting from drive to reverse(or visa-versa) and turning at the same time. It will randomly lunge while turning however just while driving with no foot on the accelerator. The throttle difference was so out of tune at one point while my wife was parking the engine actually shut off.

I'm going to start with the air filter(been neglecting that), then the MAF, then the throttle body hoping that it will stop there. If anyone has an input that would be fantastic. Wondering about making my own post on this as well.

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jas88
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Re: Engine revs and tries to lunges when applying the breaks

Post by jas88 » Fri Jul 26, 2019 6:40 am

Clean the TB and reset the computer.
2006 SE Silver w/Slate cloth

Willass Maximus
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Re: Engine revs and tries to lunges when applying the breaks

Post by Willass Maximus » Mon Jul 29, 2019 5:37 pm

So I replaced the air filter since it was pretty dirty! I also cleaned the throttle body (P061B and P2106), and replaced the fuel rail sensor (P0193). Just left the negative unhooked the whole hour it took me for that. When I started the car the check engine light was off and the lunging completely disappeared!

Before clean(the other side wasn't overly dirty):
67234328_414500412488923_380528003572039680_n.jpg
67234328_414500412488923_380528003572039680_n.jpg (95.11 KiB) Viewed 376 times
After clean:
67310930_720315405070360_8407527485557702656_n.jpg
67310930_720315405070360_8407527485557702656_n.jpg (135.81 KiB) Viewed 376 times

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