Thomas Yarri
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  • Winder, GA
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Vacuum modulator causing rough idle

Started this discussion. Last reply by Tony and Ginny 429 Sep 4. 14 Replies

Guys, I’m stumped! I’ve replaced my carburetor, my ignition system upgraded to pertronix and their coil, plugs are new, compression is very good, no vacuum leaks and still the dang car idles like…Continue

Vacuum advance

Started this discussion. Last reply by Thomas Yarri Aug 3. 4 Replies

Good afternoon to all my fellow Cadillac owners! I have a question about the vacuum advance on my car. The car is a 64 without a/c and a Rochester carburetor. I noticed that I have vacuum at the port…Continue

Rochester carb

Started this discussion. Last reply by Russ Austin Jul 15. 5 Replies

I need a new base for my carb. It’s all pitted and I think it’s causing a rough idle. Jason or Russ do you have one in good shape?

64 deville choke heat tube

Started this discussion. Last reply by Thomas Yarri Jun 17. 2 Replies

Hey guys hope you’re having a great day. I have a question about the choke heater tube. Mine is loose at the intake and seems to be causing a vacuum leak. Any thoughts on how to seal this up?

 

Thomas Yarri's Page

Latest Activity

Thomas Yarri commented on Jason Edge's blog post Fluid Capacity Chart
"Anyone know what diff fluid to use, non a/c with 2.94 rear axle?"
Sep 11
Tony and Ginny 429 replied to Thomas Yarri's discussion Vacuum modulator causing rough idle
"I have no experience with a cracked intake or where they might break  Enjoy "
Sep 4
Tony and Ginny 429 replied to Thomas Yarri's discussion Vacuum modulator causing rough idle
"Spray water on the intake manifold  seams and the carbs base   etc with the engine running and you will hear a change in the engines sound when the water hits the leak area  Enjoy "
Sep 4
Thomas Yarri replied to Thomas Yarri's discussion Vacuum modulator causing rough idle
"I did and no change. I’ve even checked the advance for movement with a timing light. When these intakes crack where do you normally see it? Top? Bottom? That’s really my next suspect. It acts like it has a vacuum leak but there are none…"
Sep 4
Tony and Ginny 429 replied to Thomas Yarri's discussion Vacuum modulator causing rough idle
"If you just unplug the line coming out of the firewall and not plug it you will be causing a major vacuum ( air ) leak into the intake so do not do that pls  Enjoy "
Sep 4
Tony and Ginny 429 replied to Thomas Yarri's discussion Vacuum modulator causing rough idle
"With a timing light on the timing plate - with the vacuum advance connected to the carb —as the RPMS increase  from idle the timing should advance up the scale you are watching if the vacuum advance internals (  vacuum bladder ) is…"
Sep 4
Tony and Ginny 429 replied to Thomas Yarri's discussion Vacuum modulator causing rough idle
"You want to unplug the hose coming out of the firer wall that connects to the fitting behind the carb —that  is taped into the the blue intake manifold  Plug the outlet of the fitting the hose  just came off  Not sure how…"
Sep 4
Thomas Yarri replied to Thomas Yarri's discussion Vacuum modulator causing rough idle
"Btw, should timing be advanced at idle or at my base, I have no vacuum at the advance when at idle. I'm running a stock Rochester that has been remanufactured. "
Sep 4
Thomas Yarri replied to Thomas Yarri's discussion Vacuum modulator causing rough idle
"Thank you Tony, I will start investigating the inside vacuum lines. I do not have comfort control or door locks. So it should be pretty simple to trace. I may also try driving with the firewall unplugged and see if there is an improvement."
Sep 4
Tony and Ginny 429 replied to Thomas Yarri's discussion Vacuum modulator causing rough idle
"You can check to see if the vacuum advance  vacuum valve is working as it should by watching the timing mark advance ( move up the scale ) when you rev the engine a little while watching the timing light on the timing plate  If you are…"
Sep 4
Thomas Yarri replied to Thomas Yarri's discussion Vacuum modulator causing rough idle
"So, how do you test for that? Also is there a specific fluid or additive hat might help with this?"
Sep 4
Thomas Yarri replied to Thomas Yarri's discussion Vacuum modulator causing rough idle
"Good morning Tony, I pulled the plugs and all is reading good. Cap is new, plugs are new-ish, wires new, coil new, pertronix ignition. The car acts like it has a vacuum leak. The only two things left are the vacuum advance which I don't believe…"
Sep 4
Tony and Ginny 429 replied to Thomas Yarri's discussion Vacuum modulator causing rough idle
"You might pull the plugs —-to  read them —and get a look at them and to see how the mixture is burning in each cylinder Plugs can tell you a lot about how the cylinders are performing  You might see a plug that is not firing or…"
Sep 3
Tony and Ginny 429 replied to Thomas Yarri's discussion Vacuum modulator causing rough idle
"Focusing on the misfire when in gear  When was the last time you changed the dist cap / rotor and  or  replaced the ignition wires  Cap is only good for 5-6000 miles and easy to forget when using the Pertronics that never needs…"
Sep 3
Mark S Anderson replied to Thomas Yarri's discussion Vacuum modulator causing rough idle
"the modulator does the same job in Drive as it does in Park, so no.If you have a smooth idle in neutral and the engine stumbles or wants to stall in drive gears, i'd be looking at the torque converter as the root cause.  Hard to tell…"
Sep 3
Thomas Yarri posted a discussion

Vacuum modulator causing rough idle

Guys, I’m stumped! I’ve replaced my carburetor, my ignition system upgraded to pertronix and their coil, plugs are new, compression is very good, no vacuum leaks and still the dang car idles like crap! It feels like it’s misfiring when in gear. It’s there most of the time but I can’t pinpoint it at all. Could a bad transmission vacuum modulator cause this? Is it common? Any ideas?
Sep 3

Profile Information

Do you own any 1963 & 1964 Cadillacs? If Yes, Year & Body Style
1964 sedan deville in beacon blue
Cadillac LaSalle Club Member? If Yes, Membership #?
No
1963/64 Cadillac Chapter Member?
No

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Join 63/64 Cadillac Website

At 8:42am on November 19, 2020, Jason Edge said…

Welcome to the 63/64 Cadillac Website.

This site is hosted by the CLC (Cadillac LaSalle Club) 1963/64 Cadillac Chapter. Joining the website is free to everyone, however, you must be a CLC member to join the Chapter. 

- Click on www.join.6364cadillac.com for more information on joining the 1963/64 Cadillac Chapter and the Cadillac LaSalle Club.

Be sure and check out all the links and pages and make yourself at home. The Help Page at www.help.6364cadillac.com will have links to many useful articles and information about our Cadillacs.

 
 
 

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Current 1963/64 Cadillac Listings on eBay

Started by Jason Edge in For Sale. Last reply by Jason Edge 18 hours ago. 0 Replies

To see all 1963/64 Cadillacs Listed on eBay in the USA…Continue

Tags: ebay

You Know You Are Into Some Serious Car Doctor When You Have to Get the Ice Out!

Started by Jason Edge in 1963/64 Cadillac Specific Discussion. Last reply by Tony and Ginny 429 yesterday. 17 Replies

You know you are into some serious car doctoring when you have to get the ice packs out. More to come on my 64 Coupe de Ville resuscitation in the next 1963/64 Cadillac Chapter Newsletter!  Mades…Continue

Unknown part, maybe the last one?

Started by Matti Roth in Restoration Discussion. Last reply by Jason Edge yesterday. 1 Reply

Hithanks to great help from chapter members I am getting my 64 Deville ready, slowly but surely.There is only one part still unclear, or actually three bolts and nuts. They are clearly different from…Continue

Leaky Windshield

Started by Tom Bahner in General Discussion. Last reply by Tom Bahner yesterday. 4 Replies

Hey all, has anyone had their windshield removed and resealed successfully. I'm pretty skittish about having someone mess with my perfectly good glass knowing that these cars are a little different…Continue

Blog Posts

1963 series 62 convertible transmission issue

Posted by Matthew VanDeWater on June 22, 2021 at 3:03pm 1 Comment

Hello I've been restoring a 63 for way to many years. Down to almost done, but have issue with trans linkage, when column in park shift rod 2 inches short. everything original. been trying to find picture of manual rod hooked up from under car to see position of linkage. was wondering if anybody has access for pictures. I wanted to see if my manual linkage is bent  wrong out of the trans if somebody dropped the trans or something. Doesn't make sense why it doesn't work. Thanks for any input…

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New vehicle in the club

Posted by Patrick Westphal on June 17, 2021 at 4:00pm 1 Comment

I was successful in getting a vehicle from the New York contact I talked about at the last club meeting. I am still trying to figure out how to post a picture of the vehicle that is tied with this comment so if you see a random picture of a black convertible in a yard, that's me haha.  …

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Torque converter grab when idling in Drive

Posted by Cliff Johnston on June 14, 2021 at 8:47pm 2 Comments

Hi Everyone, been quite a while since i have been on here.

I have had an issue with the idle on my 64 Coupe Deville ever since i have had it.

With the Idle set high enough that it is smooth, but still a nice idle, the RPM seems only slightly too high for the stall of the Torque Converter. And therefore it tends to sit there and grab and lunge a bit. So until now, i have been putting the car in Neutral at the lights to stop this happening.

I've had the car dyno tuned and…

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Can you help? Driveshaft Question....

Posted by Chris on May 30, 2021 at 8:55am 1 Comment

Hello!

Newbie to the group here - we have already found tons of invaluable information on the board, so thanks! We are restoring a 1963 Series 62 Convertible. We are wondering if anyone knows of a source to buy the propellor yoke flange (that bolts to the pinion flange) for the driveshaft? One of our ears partially broke off. Not sure if we can buy just the yoke flange as an aftermarket part, or if it has to be rebuilt by a welder/fab guy? Maybe a salvage yard for a source? Again, any…

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