Click Here -> Please Consider Making a PayPal Contribution to the FordSix Forum!
2019 Contributors:
NJwpod, 1strodeo, mightynorseman, maxtrux, 6d7coupe, broncr, Phase3, 68Flareside240, bmbm40,
mustang6, WorldChampGramp, justintendo, BigBlue94, ags290, motorsickle1130, Rooster, ousooner919, ethanperry
rzcrisis, DoctorC, jamyers, Motorboy, fastpat, Silverback280, chad


<<< New Site Update >>>

Holley 1940 problems

Moderator: Mod Squad

User avatar
StarDiero75
Registered User
Posts: 894
Joined: Tue Jun 13, 2017 9:39 pm
Location: Bremerton, WA

Holley 1940 problems

Post #1 by StarDiero75 » Fri Aug 11, 2017 6:22 pm

Hey guys.

So I have this nasty vacuum leak that I cannot find. I've replaced the manifold to spacer and spacer to cash gaskets, rebuilt the carb and yet still nothing better. I got a video of it running on YouTube under "Holley 1940 running weird"
Please help. I'm trying to ditch my 1904 and the 1940 makes the car feel like a lot more power but it just runs like crap.
Any other questions please ask

Thanks!
--1965 Ranchero w/1966 200, dual friction diaphram 9" Modern Driveline clutch and billet flywheel all balanced, 1985 SVO WC T5 with front shift, 1966 2.8 Ford 8", Weber 32/26 with VI adapter, CRT Performance HEI.
--1961 Studebaker Lark VI, OHV 170 l6 in the process of being resurrected. But it lives
--Creator of the only Weber 32/36 conversion video.

User avatar
chad
Registered User
Posts: 4906
Joined: Sat Oct 24, 2009 9:51 am
Location: Lawrence Swamp, S. Amherst, MA

Re: Holley 1940 problems

Post #2 by chad » Fri Aug 11, 2017 8:04 pm

Two places 2 start:
make sure the carb 'matches' the dizzy (LOM / SCV).
See "the Handbook" or click above @ "Tech Archive" if uncertain.
(we need more details to Dx).

If all set w/above:
spray around there w/starter fluid, etc to locate vac leak.
"Big thing is only make one change at a time. Change 2 or more things at a time it becomes difficult to figure which change helped or hurt" turbo2256b » 1/16/2017
Chad - '70 LUEB on '77 frame (i.e. PS, D44, trapezoidal BB 9", 4.11), 250, NV 3550 & DSII to B transplanted, "T" D20/PTO, 2" SL, 1" BL, 4 discs, 33"X15", tool boxes, etc. Seeking: Hydraulic gear motor for Koenig pto. chrlsful@aol.com (413) 259-1749

User avatar
StarDiero75
Registered User
Posts: 894
Joined: Tue Jun 13, 2017 9:39 pm
Location: Bremerton, WA

Re: Holley 1940 problems

Post #3 by StarDiero75 » Sat Aug 12, 2017 2:55 am

chad wrote:Two places 2 start:
make sure the carb 'matches' the dizzy (LOM / SCV).
See "the Handbook" or click above @ "Tech Archive" if uncertain.
(we need more details to Dx).

If all set w/above:
spray around there w/starter fluid, etc to locate vac leak.

It's got a new HEI dizzy and the 1940 doesn't have a spark valve. I'll check with the starter fluid next.
The carb came out of the auto wreckers and I'm hoping somehow it's not damaged or warped.
--1965 Ranchero w/1966 200, dual friction diaphram 9" Modern Driveline clutch and billet flywheel all balanced, 1985 SVO WC T5 with front shift, 1966 2.8 Ford 8", Weber 32/26 with VI adapter, CRT Performance HEI.
--1961 Studebaker Lark VI, OHV 170 l6 in the process of being resurrected. But it lives
--Creator of the only Weber 32/36 conversion video.

CZLN6
VIP Member
Posts: 3332
Joined: Fri Nov 15, 2002 11:07 am
Location: Idaho Falls, Id
Contact:

Re: Holley 1940 problems

Post #4 by CZLN6 » Sat Aug 12, 2017 6:21 pm

Howdy Star;

Welcome. and more Info please. What are you working with?

The Holley #1940 can be a bugger to sort out. Do you know what the #1940 came off of?

You can buy a mechanics stephoscope over at Harbor Freight Tool. IT can really help you zero in on a vacuum leak.

Keep it coming.

Adios, David
co-author of the Falcon Performance Handbook
http://www.falcon6handbook.com/

User avatar
chad
Registered User
Posts: 4906
Joined: Sat Oct 24, 2009 9:51 am
Location: Lawrence Swamp, S. Amherst, MA

Re: Holley 1940 problems

Post #5 by chad » Sat Aug 12, 2017 8:14 pm

stethiscope is safer if staying away frm belts & other moving parts,
take a length of garden hose & move it around w/1 hand - other end 2 ur ear...
"Big thing is only make one change at a time. Change 2 or more things at a time it becomes difficult to figure which change helped or hurt" turbo2256b » 1/16/2017
Chad - '70 LUEB on '77 frame (i.e. PS, D44, trapezoidal BB 9", 4.11), 250, NV 3550 & DSII to B transplanted, "T" D20/PTO, 2" SL, 1" BL, 4 discs, 33"X15", tool boxes, etc. Seeking: Hydraulic gear motor for Koenig pto. chrlsful@aol.com (413) 259-1749

ags290
Registered User
Posts: 165
Joined: Tue Jun 23, 2015 5:09 pm
Location: Mansfield Texas

Re: Holley 1940 problems

Post #6 by ags290 » Sat Aug 12, 2017 8:57 pm

What was the car running like with the original carb? I know you said that the 1940 felt like it gave you better performance. If you have an automatic transmission, have you checked your vacuum line to the vacuum modulator? Also since you have not seen the 1940 on a running engine what was the overall condition before the rebuild? Especially how was the throttle shaft clearance? Lastly did you do the carb and distributor at the same time? I know a lot of people don't like the 1940, I must be the minority as I have had great luck with mine.

Kevin
Kevin
Early 1965 Mustang with a 170

User avatar
StarDiero75
Registered User
Posts: 894
Joined: Tue Jun 13, 2017 9:39 pm
Location: Bremerton, WA

Re: Holley 1940 problems

Post #7 by StarDiero75 » Sun Aug 13, 2017 3:44 am

ags290 wrote:What was the car running like with the original carb? I know you said that the 1940 felt like it gave you better performance. If you have an automatic transmission, have you checked your vacuum line to the vacuum modulator? Also since you have not seen the 1940 on a running engine what was the overall condition before the rebuild? Especially how was the throttle shaft clearance? Lastly did you do the carb and distributor at the same time? I know a lot of people don't like the 1940, I must be the minority as I have had great luck with mine.

Kevin

With the original carb, the holley 1904, it ran fine, no issues whatsoever.

I have the 3 speed manual in the car.

I got the 1940 out of my local auto wreckers and it was in spooky shape. I took it to a local carb guy thatg everyone trusts and even he had issues with it. The butterfly was seized real good, the idle mixture screw was broken off inside of it, the economizer was seized real good, and the check ball was also seized bad. He finally got everything fine and I found a new screw after he was able to drill the old one out.

I did the distributor months ago.

The carb feels like a good carb, real good throttle response even with a bad vacuum leak. I actually found the leak today. It was the screw. I sprayed carb cleaner around it and it started stumbling. The trick now it to find a replacement throttle body, know anyone?
--1965 Ranchero w/1966 200, dual friction diaphram 9" Modern Driveline clutch and billet flywheel all balanced, 1985 SVO WC T5 with front shift, 1966 2.8 Ford 8", Weber 32/26 with VI adapter, CRT Performance HEI.
--1961 Studebaker Lark VI, OHV 170 l6 in the process of being resurrected. But it lives
--Creator of the only Weber 32/36 conversion video.

User avatar
StarDiero75
Registered User
Posts: 894
Joined: Tue Jun 13, 2017 9:39 pm
Location: Bremerton, WA

Re: Holley 1940 problems

Post #8 by StarDiero75 » Sun Aug 13, 2017 3:48 am

CZLN6 wrote:Howdy Star;

Welcome. and more Info please. What are you working with?

The Holley #1940 can be a bugger to sort out. Do you know what the #1940 came off of?

You can buy a mechanics stephoscope over at Harbor Freight Tool. IT can really help you zero in on a vacuum leak.

Keep it coming.

Adios, David

I'm working with a 65 Ranchero with a 200, 3 spd man, 40k volt HEI distributor.

The carb was found on a 1966 or 67 mustang 200 with an auto I believe.

Mechanics stethoscope? Is it like a doctor's one?

Thanks
Ryan
--1965 Ranchero w/1966 200, dual friction diaphram 9" Modern Driveline clutch and billet flywheel all balanced, 1985 SVO WC T5 with front shift, 1966 2.8 Ford 8", Weber 32/26 with VI adapter, CRT Performance HEI.
--1961 Studebaker Lark VI, OHV 170 l6 in the process of being resurrected. But it lives
--Creator of the only Weber 32/36 conversion video.

CZLN6
VIP Member
Posts: 3332
Joined: Fri Nov 15, 2002 11:07 am
Location: Idaho Falls, Id
Contact:

Re: Holley 1940 problems

Post #9 by CZLN6 » Sun Aug 13, 2017 10:39 am

Howdy Back Ryan:

Good going on finding the leak.

Q- "Mechanics stethoscope (stethiscope, thanks Chad)? Is it like a doctor's one?"
A- It is similar. The end, opposite from the ear pieces, is a long, slender, hollow rod, which you can insert into various areas of the engine compartment to zero in on a vacuum leak noise. The are inexpensive and easy to use. Chad's suggestion to use tubing or hose is also useable but harder to probe safely into some areas of the engine.

Keep it coming and good luck.

Adios, David
co-author of the Falcon Performance Handbook
http://www.falcon6handbook.com/

ags290
Registered User
Posts: 165
Joined: Tue Jun 23, 2015 5:09 pm
Location: Mansfield Texas

Re: Holley 1940 problems

Post #10 by ags290 » Mon Aug 14, 2017 10:19 am

Glad you found your leak!
Kevin
Early 1965 Mustang with a 170

User avatar
chad
Registered User
Posts: 4906
Joined: Sat Oct 24, 2009 9:51 am
Location: Lawrence Swamp, S. Amherst, MA

Re: Holley 1940 problems

Post #11 by chad » Mon Aug 14, 2017 5:29 pm

BTW:
I'll take the 1904 if U wanna sell it...
Zip: 01002
"Big thing is only make one change at a time. Change 2 or more things at a time it becomes difficult to figure which change helped or hurt" turbo2256b » 1/16/2017
Chad - '70 LUEB on '77 frame (i.e. PS, D44, trapezoidal BB 9", 4.11), 250, NV 3550 & DSII to B transplanted, "T" D20/PTO, 2" SL, 1" BL, 4 discs, 33"X15", tool boxes, etc. Seeking: Hydraulic gear motor for Koenig pto. chrlsful@aol.com (413) 259-1749

User avatar
StarDiero75
Registered User
Posts: 894
Joined: Tue Jun 13, 2017 9:39 pm
Location: Bremerton, WA

Re: Holley 1940 problems

Post #12 by StarDiero75 » Tue Aug 15, 2017 4:10 pm

chad wrote:BTW:
I'll take the 1904 if U wanna sell it...
Zip: 01002

Man I could never part with the 1904, I may not like using it but I can't get rid of it. It's old reliable and never fails to work, plus it's got a special story.
Once upon a time about 6 months ago, I had not a carburetor for my car. The automate 1100 was a piece of crap and another 1908 that I found had a crack in the side of the bowl from overtightening. So I went to a completely different auto wreckers and they didn't really have a bunch of old cords but they had this 1952 F1, the truck was all there! It even had the keys in the ignition, a complete time capsule. We would've bought the truck but we didn't have the money, it was beautiful. Also it had what we were looking for, a 1904. So we took it off and gave it a quick cleaning, it was actually pretty clean; I probably could have slapped it on my car and it would've worked. We swapped all the gaskets off the toast 1908 and put them on the 1904 and off we went. The Ranchero started right up and that's how it's been ever since. A few weeks after this my dad and I called back to the auto wreckers to inquire about the F1, they had disassembled and parted the whole thing out. It was a perfect complete truck!!!! So the 1904 is a reminder to my dad and I of a real neat truck that didn't deserve to die.
The end.
--1965 Ranchero w/1966 200, dual friction diaphram 9" Modern Driveline clutch and billet flywheel all balanced, 1985 SVO WC T5 with front shift, 1966 2.8 Ford 8", Weber 32/26 with VI adapter, CRT Performance HEI.
--1961 Studebaker Lark VI, OHV 170 l6 in the process of being resurrected. But it lives
--Creator of the only Weber 32/36 conversion video.

User avatar
StarDiero75
Registered User
Posts: 894
Joined: Tue Jun 13, 2017 9:39 pm
Location: Bremerton, WA

Re: Holley 1940 problems

Post #13 by StarDiero75 » Tue Aug 15, 2017 4:12 pm

ags290 wrote:What was the car running like with the original carb? I know you said that the 1940 felt like it gave you better performance. If you have an automatic transmission, have you checked your vacuum line to the vacuum modulator? Also since you have not seen the 1940 on a running engine what was the overall condition before the rebuild? Especially how was the throttle shaft clearance? Lastly did you do the carb and distributor at the same time? I know a lot of people don't like the 1940, I must be the minority as I have had great luck with mine.

Kevin

You wouldn't happen to know someone with a 1940 they're parting out Or selling, would you? I gotta find a throttle body but everyone wants way too much for the carb in general.
--1965 Ranchero w/1966 200, dual friction diaphram 9" Modern Driveline clutch and billet flywheel all balanced, 1985 SVO WC T5 with front shift, 1966 2.8 Ford 8", Weber 32/26 with VI adapter, CRT Performance HEI.
--1961 Studebaker Lark VI, OHV 170 l6 in the process of being resurrected. But it lives
--Creator of the only Weber 32/36 conversion video.

User avatar
chad
Registered User
Posts: 4906
Joined: Sat Oct 24, 2009 9:51 am
Location: Lawrence Swamp, S. Amherst, MA

Re: Holley 1940 problems

Post #14 by chad » Tue Aug 15, 2017 7:30 pm

our "4 sale"?
BTW: nice story (altho a horror based 1...reminds me of the nightmares I had during: 'Cash 4 Crushers' or whatever it wuz)
"Big thing is only make one change at a time. Change 2 or more things at a time it becomes difficult to figure which change helped or hurt" turbo2256b » 1/16/2017
Chad - '70 LUEB on '77 frame (i.e. PS, D44, trapezoidal BB 9", 4.11), 250, NV 3550 & DSII to B transplanted, "T" D20/PTO, 2" SL, 1" BL, 4 discs, 33"X15", tool boxes, etc. Seeking: Hydraulic gear motor for Koenig pto. chrlsful@aol.com (413) 259-1749

Who is online

Users browsing this forum: No registered users and 8 guests