skizior
Forum Newbie
Posts: 16
Reg: 06-14-12
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06-14-12 08:12 PM - Post#2237263
So I just purchased a 65 Impala convertible with a 455 a few weeks ago. It's not show quality but it's a great driver quality car. It has driven great for the first two weekends but last Sat. I'm in the middle of an intersection at a complete stop waiting to make a left hand turn, press on the gas and the throttle sticks and the engine revs like I stomped on the gas (which I didn't). I hit the break but it continues to rev up and I'm now doing an involuntary burnout. I quickly turn the car off and push it to the side of the road.
I sit a few min regain my composure, check for dampness in the groin area...finding none I try again and all is well for a few miles. I take it home, check the linkage, spray wd40 on the linkage (under the dash, by the firewall, where it meets the 750 cfm Edelbrock carb) and try it again...slowly accelerating and it does it again. Not as bad but it still got stuck.
Any ideas? Could it be the carb? I don't think it was the floor mat. The pedal sits very loose on the linkage and there doesn't' seem to be anything it would catch on. The engine was rebuilt, and everything on it looks new to mint. One of the reasons I purchased it. I'll post pics if you like. Thanks in advance for the help.
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Gaspains
Contributor
Posts: 105
Loc: Mankato, MN
Reg: 11-23-09
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06-14-12 08:17 PM - Post#2237265
In response to skizior
Skizior
The butterfly shaft may be sticking within the carb. My Carter did the same thing after I reassembled it with the heat shield in the wrong place. Exhaust gas corroded the throttle shaft making it stick. I've got a 327 with a Carter AFB so your mileage may vary, but just a thought.
Kevin
1965 Impala SS Coupe
Regal Red with Black Interior
L74 327 - 300 hp
M-20 Muncie
3.31 12 bolt |
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69 BelAir
Member
Posts: 22
Loc: Pacific Northwest, USA
Reg: 03-04-06
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06-14-12 08:23 PM - Post#2237270
In response to skizior
Sounds like a broken motor mount on the drivers side.
Bill
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 JimKshortstep4x4
Chevytalk Moderator & "9th Year" Silver Supporting Member
Posts: 4193
Loc: Muskegon, MI, USA
Reg: 03-28-02
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06-15-12 02:23 AM - Post#2237306
In response to skizior
Welcome to Chevy Talk from West Michigan!
Sounds like a scary experience!
As mentioned, the driver's side motor mount is a possibility.
Jim
Member 65-66 Full Size Chevrolet Club
65 Impala SS, 400sbc, Muncie M-22
66 Impala SS, 396, TH 400
69 El Camino, 350, TH 350
71 Short bed stepside 4x4, 350/350
71 Snow plow, 4x4, 350, TH 350
Current project, 72 GMC Shortbed, stepside, 427 |
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Vermontboy
Contributor
Posts: 110
Loc: Webster, NY
Reg: 08-22-11
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06-15-12 02:26 AM - Post#2237307
In response to 69 BelAir
I'll second the motor mount - believe that Chevrolet put out a kit to "cure" the possibility of a broken motor mount creating that problem because the mounts were prone to breakage...
Vermontboy
"When the power of love overcomes the love of power, the world will know peace"
Jimi Hendrix |
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BBChevro
Contributor
Posts: 109
Age: 54
Loc: Qld., Australia
Reg: 03-31-12
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06-15-12 04:19 AM - Post#2237321
In response to Vermontboy
I'll second the motor mount - believe that Chevrolet put out a kit to "cure" the possibility of a broken motor mount creating that problem because the mounts were prone to breakage...
Count me in on that opinion as well - the cure (that was done at the dealerships) was to add a cable that physically restrained the motor.
A better solution would be to replace the mount with an interlocking style - where one plate curls around the other plate & (if the rubber lets go) the 2 plates catch each other.
It was probably just a time saver for them to use the tether - the problem was common & (from what I've heard) often had similar results.
Mark
Mark
There is light at the end of the tunnel..... hopefully, it's not a train. |
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skizior
Forum Newbie
Posts: 16
Reg: 06-14-12
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06-15-12 05:10 AM - Post#2237333
In response to BBChevro
Thanks guys, I'll check it out. What do you think it will cost to get the mount replaced?
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leon phelps
Valued Contributor
Posts: 3048
Loc: Croydon Manor, PA
Reg: 06-04-05
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06-15-12 05:31 AM - Post#2237341
In response to skizior
depends if you do it yourself.
parts are probably around $30.
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HAL_396
Member
Posts: 2722
Loc: Austin, TX
Reg: 11-16-06
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06-15-12 06:45 AM - Post#2237359
In response to skizior
This might give you a hint what is going on: Motor Mount
Energy suspnsion sells good mounts. You will need the short and wide mounts.
1955 Chevy Custom
1966 Biscayne
1966 Caprice Drag Car Inwork
1966 Caprice parts car
2004 Silverado
2007 Impala LS
2009 G5 |
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427SS65
"9th Year" Platinum Supporting Member & Moderator
Posts: 12322
Age: 67
Loc: St. Louis, MO
Reg: 12-11-03
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06-15-12 07:36 AM - Post#2237379
In response to HAL_396
Energy is the way to go. Theirs is a safety interlocking mount that fits like a glove. Look in the Reference Materials area for the spec sheet.
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skizior
Forum Newbie
Posts: 16
Reg: 06-14-12
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06-15-12 10:47 AM - Post#2237435
In response to 427SS65
I was just playing around with it and while it has two return springs they are pretty loose. Is it worth while to see if I can't find a stronger spring?
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427SS65
"9th Year" Platinum Supporting Member & Moderator
Posts: 12322
Age: 67
Loc: St. Louis, MO
Reg: 12-11-03
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06-15-12 11:16 AM - Post#2237446
In response to skizior
You can put a heavier spring on it. It will make the gas pedal harder to depress.
First, try removing the accelerator rod from the carb and with the engine turned off, crank the carb wide open to feel if there is any binding in the throttle shaft, If it is binding, you will need a new throttle body on the carb itself, or the throttle blades are binding against a gasket or something else.
Oh, and by the way, welcome to ChevyTalk!
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BIGIRON
Contributor
Posts: 131
Loc: Oxford, N.C.
Reg: 05-07-10
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06-15-12 12:27 PM - Post#2237473
In response to skizior
While a stronger spring sounds reasonable at first glance, there's a couple of reasons to avoid this modification.
First, the added tension causes the throttle bore and shaft to wear prematurely. Second, a strong spring can cause leg fatigue if driving long distances.
Replacing your old spring with a new, same type may be your best option.
Most of the motor mounts that I have bought (65-70 B Bodies) from parts stores are of the "safety" type. All have had an interlock designed in to protect against separation.
BIGIRON
Edited by BIGIRON on 06-15-12 12:31 PM. Reason for edit: No reason given.
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 bajones238
"3rd Year" Gold Supporting Member
Posts: 217
Loc: Georgia
Reg: 06-19-11
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06-15-12 12:37 PM - Post#2237477
In response to BIGIRON
Here's a copy of the recall letter on the engine mounts. It sounds like they are describing your problem.
1965 Impala SS 327/M20
1965 Chevelle SS 327/M20
VCCA #47487
AACA #446449 |
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skizior
Forum Newbie
Posts: 16
Reg: 06-14-12
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06-15-12 02:20 PM - Post#2237513
In response to bajones238
You guys rock. Thanks for all the help.
Update: I went to the parts store and got a new spring in the hopes of a quick fix. It's only marginally stronger than the first one. So I put it on have just come back from the test drive.
Still having the issue but to a much lesser extent. It only stick from a dead stop or near dead stop and only for a second or two. Still far from safe but it's better than what it was. I'm hoping it's the carb and will take a look once the 454 cools down a bit.
Is there a way to inspect the motor mount with out removing anything?
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BBChevro
Contributor
Posts: 109
Age: 54
Loc: Qld., Australia
Reg: 03-31-12
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06-15-12 03:00 PM - Post#2237531
In response to skizior
...Is there a way to inspect the motor mount with out removing anything?
Just put a jack under the oil pan (with something to spread the weight & protect the pan) & slowly lift the motor - you'll soon see the mount separating.
It's probably something to do sooner rather than later - you already know what could happen again.
Mark
Mark
There is light at the end of the tunnel..... hopefully, it's not a train. |
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BBChevro
Contributor
Posts: 109
Age: 54
Loc: Qld., Australia
Reg: 03-31-12
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06-15-12 03:10 PM - Post#2237536
In response to bajones238
Here's a copy of the recall letter on the engine mounts. It sounds like they are describing your problem.
That's great to see the actual recall letter - it's right up there with finding a build sheet under your seat.
We should have a special area in the forum to keep historical documents like this.
Thanks for posting it. 
Mark
Mark
There is light at the end of the tunnel..... hopefully, it's not a train. |
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skizior
Forum Newbie
Posts: 16
Reg: 06-14-12
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06-15-12 03:17 PM - Post#2237541
In response to BBChevro
Anyone know a good mechanic in NE Illinois? I'm thinking this is too serious of an issue for a poser like me. 
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 SS_in_Seattle
"4th Year" Platinum Supporting Member
Posts: 1521
Reg: 05-08-03
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06-15-12 03:25 PM - Post#2237544
In response to skizior
Skiz...
Are you 100% certain that you didn't borrow my right foot for a minute? 
I'm glad that you & the car are alright! Something very similar happened to my buddy & me in high school [It was the motor mount] and we ended up plowing a nice lady's front yard and destroying her porch.
Remember when they used to call that thing under your right foot the Accelerator?
1965 Impala SS L78
1966 Impala SS Convertible
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 62chevy427
"7th Year" Silver Supporting Member
Posts: 1516
Loc: laurens sc
Reg: 04-13-06
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06-15-12 04:29 PM - Post#2237561
In response to Vermontboy
they did. the kit consisted of a bracket mounted on the frame,one on the engine and a cable in between.then they came out with mounts with an interlock.
56 bel air ((since 2002)
62 impala ss (since 1965)
65 el camino (since 1969)
66 nova (since 1987)
67 malibu convertible (since 1981)
72 el camino ss454 (since 1985)
83 gmc 4wd (since 1991)
95 impala (new)
11 malibu (new) |
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slammed1
Contributor
Posts: 714
Age: 42
Loc: Ark
Reg: 03-28-12
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06-15-12 04:52 PM - Post#2237572
In response to 427SS65
You can put a heavier spring on it. It will make the gas pedal harder to depress.
First, try removing the accelerator rod from the carb and with the engine turned off, crank the carb wide open to feel if there is any binding in the throttle shaft, If it is binding, you will need a new throttle body on the carb itself, or the throttle blades are binding against a gasket or something else.
Oh, and by the way, welcome to ChevyTalk!
This was going to be my exact advice.
Tell you what,try and take a picture of your engine and a good shot of the carb/cable or rad and set up. Theres alot we can see in a pic if the pic is clear enough.Im only asking this as you said 455 so I was wondering if the previous owner added a cable style linkage or if the stock style rod linkage is still there.
Please see if you can get a couple good clear shots.
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427SS65
"9th Year" Platinum Supporting Member & Moderator
Posts: 12322
Age: 67
Loc: St. Louis, MO
Reg: 12-11-03
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06-15-12 08:30 PM - Post#2237652
In response to slammed1
I certainly hope he tries to see if that is the problem before throwing mounts in it!
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427SS65
"9th Year" Platinum Supporting Member & Moderator
Posts: 12322
Age: 67
Loc: St. Louis, MO
Reg: 12-11-03
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06-15-12 08:32 PM - Post#2237654
In response to BBChevro
Mark, I had the recalls and TSB's posted in the sticky area, but they got mysteriously deleted about a year ago. They didn't get read very much, and I imagine that was the reason why.
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65_Impala
Very Senior Member
Posts: 1607
Reg: 12-29-02
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06-16-12 09:17 AM - Post#2237807
In response to skizior
Posting some good pictures of the linkage would be a good start.
If it's the mount then the energy suspension mounts are good pieces. Really only needed on the drivers side. My understanding was that the newer style factory interlocking mounts were a little different dimensionally and were close but would not quite drop-in but maybe I'm wrong about that.
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427SS65
"9th Year" Platinum Supporting Member & Moderator
Posts: 12322
Age: 67
Loc: St. Louis, MO
Reg: 12-11-03
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06-16-12 11:09 PM - Post#2238104
In response to BBChevro
I have just added the recalls and TSB's (what I have) to the Reference Materials area.
If you have any additional (or know where to find them) send them to me and I'll add them to the reference.
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BBChevro
Contributor
Posts: 109
Age: 54
Loc: Qld., Australia
Reg: 03-31-12
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06-17-12 06:34 AM - Post#2238173
In response to 427SS65
Thanks Tom, I hadn't really looked much at the reference area before - there's a lot of really interesting stuff there & a lot of very useful stuff too (I've just spent the last hour looking through the parts book - I can hardly wait for the '65 Fisher body manual).
I am so glad that I discovered this forum.
Mark
Mark
There is light at the end of the tunnel..... hopefully, it's not a train. |
Edited by BBChevro on 06-17-12 06:39 AM. Reason for edit: No reason given.
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427SS65
"9th Year" Platinum Supporting Member & Moderator
Posts: 12322
Age: 67
Loc: St. Louis, MO
Reg: 12-11-03
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06-17-12 12:03 PM - Post#2238281
In response to BBChevro
I'm sorry to say, the Fisher manual is sitting about 5 feet from where I'm sitting.....
Another 'round to it assignment!
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slammed1
Contributor
Posts: 714
Age: 42
Loc: Ark
Reg: 03-28-12
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06-17-12 04:23 PM - Post#2238365
In response to 427SS65
skizior,any way you can take a few pictures and post here so we can maybe help a little better.
I like to see the pictures,as you can blow them up on the pc and look at finer details if they are good enough pics.
I had a suspension business for years and shipped kits and parts nationwide and you wouldnt believe the issues some guys had with either "professional" installers or "driveway" installs by people not paying attention or not reading instructions. There was always something i could see in a picture that I could use to help them out to fix and issue or problem.I seen some doozies for sure.But were able to get them squared away by seeing a good detailed picture.
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vervius
Forum Newbie
Posts: 3
Reg: 06-06-12
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06-23-12 04:25 PM - Post#2240571
In response to skizior
Happened to me last weekend, same exact thing. A holding pin from the carb rod got stuck, basically leaving it halfway open and causing the car to basically redline on start. Checked all the big problems and then just pulled the pin to release and put it back in (with minor adjusting).
Sometimes simple is easier.
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skizior
Forum Newbie
Posts: 16
Reg: 06-14-12
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06-27-12 02:43 PM - Post#2242024
In response to vervius
Hi Everyone. Just closing the loop here. First Thanks for all the advice. Took it in and Yup it was the motor mounts. Scared my mechanic half to death taking it for a test drive to demonstrate the issue. Couldn't have done it with out you. Thanks again.
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