1967 Cadillac EldoradoGERALD´S CADILLACS - NEWS

1978 ACCELERATOR PUMP REPAIR

My low mileage 1978 Eldorado Biarritz ran super nice. It idled like a clockwork but it sometimes had one problem:
The car would have a slight hesitation for one or two seconds when driving away from standing still and idling. The hesitation was not present at any higher speeds - only when starting from standing still, no matter how hard I hit the pedal.
Once the car was rolling, it ran perfectly. 2 or 3 times the engine even stalled in the past.
That's why I suspected the accelerator pump.
Replacing it is not too difficult. You basically only need a rebuild kit and remove the carburetor from the car. Then you have to remove 8 screws to take the top off and remove 2 linkages. I'm not a carburetor expert at all, but luckily my friends ,who did the job before, helped me, but it really is not difficult at all. I found some great how-to video on YouTube on how the Quadrajets are taken apart and back together - They have some very informative videos on their youtube channel - here is one of them:

1978 Cadillac Carburetor QuadrajetThe Quadrajet after removal.78carbopen-IMG_8059
The Quadrajet with the top removed
accpump-IMG_8058bgThe accelerator pump on the right sidecarbmonday2guys
My friends Steve and Lucky helped a lot. Thanks my friends! We did all the work in Luckys fantastic garage and shop.
carbmondaysteve+gerald
friendsandcarbsWe had "Carburetor Monday" as everybody was working on their carburetors.

We replaced the pump rubber and put everything back together. The carburetor looked very clean inside with only minor deposits, so we left everything else as it was.
I can't wait to install it back into the car and hope the problem is fixed - did not do a full rebuild as it is still very clean and nice inside. Only installed new rubber on the pump and new top gaskets.

UPDATE: (12/20/2022)
Today I managed to install the carburetor back into the car. It idles beautifully again and started right up. Unfortunately there was a snow storm outside So I could only drive it a few feet. So far so good - seems like the problem with hesitation is gone, but I will have to do a real test drive to make sure it works as it should.

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1966 HOT CHOKE CARBURETOR REPAIR

When I got my 1966 Cadillac back the choke did no longer work. The hot air choke mechanism on the Carter AFB carb was stuck open and thats why the previous owner removed the choke linkage, which would close the primaries when the car was cold.
I removed the choke housing from the car and it was completely stuck and did not move at all. Both the lever and the counter weight were completely frozen up although everything inside the housing looked pretty clean.

First I tried anti seize oil which did not change anything. Then I soaked the unit in a parts cleaner solution over night which did not free it up either. The next day I soaked it in a rust removing solution which did not help either. I then put it in a can of transmission fluid for a while.
In-between I always gently tried to move it and suddenly it freed up and now works perfectly smooth again. I put the carburetor back together and now the car is very easy to start again - even on a very cold day.


The choke after repair.
chokeassembly-IMG_8035The choke mechanism disassembled for repair after I managed to free it up.chokeassembly-IMG_8028IMG_8037

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1967 ELDORADO CARBURETOR REPLACEMENT

I installed a rebuilt carburetor from www.carburetorcenter.com into my 1967 Eldorado today. It suffered from bad idle when fully warmed up at low RPM. It had a problem with the secondaries not closing properly and was worn out a bit. It's an easy install. The 1967 Eldorado uses a unique linkage for the transmission switch, which is a one year only item. Take good care of yours!
The Eldorado now purrs like a kitten again with its new Quadrajet. I now have two more carburetors to do - the 1966 has a stuck choke and the 1978 needs a new accelerator pump.... The video is also available on YouTube in 4K HDR quality...


I took a short video of the installation process.1967 Cadillac Eldorado Quadrajet
The rebuilt Quadrajet on the bench.
Original 1967 Cadillac Eldorado Quadrajet
The old original 1967 Eldorado Quadrajet - this is the non California version.

1967 Cadillac Eldorado Quadrajet

The rebuilt Quadrajet installed.

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LINCOLN MARK III CARBURETOR REBUILD

I just recently replaced the fuel pump on my Mark III. I thought that would have solved my problems for a while. When I started the car a couple of days later it did not idle as smooth as before though. I checked everything and when I touched one of the ignition wires I got an electrical shock. So I knew that I would have to replace the ignition wires and ordered some new ones with spark plugs. When I entered the garage the next day there were some fuel fumes in the air which one could smell pretty clearly. The new fuel pump was dry and after a while of searching I saw that the carburetor was leaking fuel out of the accelerator pump gasket…
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Float bowl gasket replaced
New diaphragm in place

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1978 Eldorado - Choke problems.

After I cleaned the engine bay of the new Biarritz I drove the car out of the garage. The car started beautifully, but for some reason it would not idle down and run on fast idle speed - even when it was fully warmed up.
The only way I could get it to normal idle speed was to manually release the fast idle cam on the carburetor. For some for me unknown reason it did not release itself - even when the car was fully warmed up...

As I´m not exactly an expert when it comes to carburetors, it took me a while to figure out what was going on and what the problem could be.

I got myself the Rochester M4MC / M4ME Carburetor Manual online and started reading. The trouble shooting section did not mention my problem and symptoms though, at least I learned a lot by reading through the manual...

The carburetor in my 1978 Eldorado is a Rochester M4ME # 17058531 (late Federal).

After a lot of reading I suspected that the electric choke thermostat must be the problem.
I removed it to test it like it is described in the manual.

Electric Choke Diagnosis and Checking


In order to have good engine performance during warm up and be able to pass Federal exhaust emission standards, the electric choke must function properly .

Possible reasons for the choke not operating properly are listed below.

1. No engine oil pressure.
2. Malfunctioning oil pressure switch.
3. No current to oil pressure switch due to:
a. Burned out 15 amp "radio -idle stop" fuse.
b. Broken wire to switch (18 brown/double white).
4. No current between choke coil and oil pressure switch due to:
a. Broken 18 light blue lead wire.
b. Wire terminal not locked on coil terminal.
c. Ground circuit incomplete between grounding plate of choke assembly and housing.
5. Failed choke coil assembly.

A voltmeter or continuity light may be used to check the circuits for continuity to the oil pressure switch and the choke coil.

If it is suspected that the choke coil assembly has failed, the following check may be made.

1. Remove coil from carburetor and cool to room temperature (above 60°F).
2. Attach a jumper wire between positive battery terminal and terminal of coil assembly. Attach a second jumper wire between negative battery terminal and grounding plate of choke coil assembly.
3. The tang of the coil should rotate 45°in 54 to 90 seconds.
4. If coil fails to rotate or exceeds the above timing specification, replace coil assembly.
5. If coil is within above timing specification then coil is good and problem is elsewhere.
6. Reinstall coil and set to proper index (Fig. 52).
If coil is cooled off sufficiently the choke valve will close when throttle is opened slightly. Attach a jumper wire between the positive battery terminal and choke coil terminal. Choke coil should warm up and the choke blade can be observed opening, indicating a good and properly grounded choke coil assembly. At room temperature the choke blade should be wide open in approximately 90 seconds.
If the choke does not operate properly after the coil has been proven satisfactory , check out the other possibilities that prevent current from getting to the choke coil.

After I performed the test procedure above it was clear that the choke coil was the problem.
I ordered a new one from www.rockauto.com and it arrived within 3 days. The manual mentions the original part #17059968 (the original one on my car showed #17059969 though - but every parts list I checked does not list this number...?).

I got a replacement from Airtex # 2C1045 and it seems to fit.
I installed it today and the choke works as it should again.


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This was the original choke thermostat on the car . #17059969
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The Airtex replacement part in the car.

The original part and the new part - slightly different at the tang of the spring - but it works and fits perfectly...

original and new part

The Airtex replacement choke thermostat

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The 67 Eldorado is at the shop again

Finally my climate compressor showed up from the USA. The USPS kind of lost it and it took three months to arrive at my door... In the meantime I had ordered another one because it was thought to be lost and so I ended up with 2 climate compressors for the Eldorado. The old one was leaking its charge and so I decided to go with a new rebuilt one.
Also the ignition and the rebuilt carburetor were not quite up to my standards yet, and so I decided to ask for some professional help for the last finishing touches. So I delivered the car to the shop, and the experts did some more tweaking. The result is that I finally have a perfectly working AC on my car. It took a while, but finally it's working as it should. When I got the car, a lot of AC parts were defective or torn out, and now everything is back to factory specs.
Also the carburetor is finally working as it should.
From a technical standpoint the car is now in perfect condition - you wont find anything that´s not working as it should.
Great! - next up is a repaint...

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The Eldo at the shop.
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I took my little son with me to show him whats going on in the restoration shop.
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Looking at so many cool cars made little Elliot very thirsty. Here he is having his milk in the shop.

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A problem with the 67 Eldorados carburetor

I brought my 67 Eldorado home from the restoration shop yesterday only to find out that the AC compressor died and leaked the fresh refill it got. Everything is new except the compressor and of course it died at the first usage. The system was pressure tested at the shop and worked like a charm. When they let the car idle with the AC on, the compressor started to leak. They tried to fix it but had no success. So I will need a new compressor and a new charge.
The right headlight door actuator also suddenly no longer works correctly. All hoses are new and it worked perfectly until recently. I can now only make it close if I jiggle on the actuator. Is there any way to rebuild them? A source for new or rebuilt ones? I have heard that the ones from the 1969 Camaro is very similar and only needs some minor modifications to work on the Eldorado as well. So I went ahead and ordered one. But the worst thing was that the freshly rebuilt carburetor made strange ticking noises and sounded like a tractor while accelerating. It worked well though, but the sound was unbearable. Could it be a defective gasket? It was also idling quite badly. Acceleration was superb though, its much more powerful than before, but still something was wrong... The ignition also was completely rebuilt. So I played around with the ignition first, but the ticking sound did not go away, no matter in which direction I changed the timing... Almost sounded like an exhaust leak, but there seemed to be none... I´ve uploaded a soundfile of the carburetor while idling. http://www.speedometerfilm.com/carb.wav It was recorded with my phone, so the sound-quality is not the best, but it should give you an idea. The phone was about 20cm away from the carburetor while recording. It was LOUD! Before I had the carb and ignition rebuilt, it was extremely quiet and idling smoothly but had misses while accelerating.
I got some very valuable tips from fellow Cadillac aficionados and the previous owner of this Eldorado even called me from the USA to give me some tips to solve this issue, and he was spot on with his diagnosis...

With a hose held to my ear and the other end to the carburetor, I was able to locate the source of the noise. It came from the carburetor below the choke assembly. So I took the freshly rebuilt Rochester Quadrajet out again, only to find out that the gasket and the metal shim were installed the wrong way around. This burned a hole into the brand new gasket where the exhaust gases from the heat crossover passage could escape and make this noise.
Of course I did not have a new gasket at hand, so I carefully removed the old one from my spare engine, which was in pretty good shape and installed it.
No more ticking - no more noises, no more bad idling.
The car now drives amazingly good and is silky smooth. It could not be any better.


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The shim was installed first and then the carb - thats wrong! The gasket has to go on the intake manifold first - then comes the metal shim.

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Here you can see the burnt gasket and the metal shim

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Putting everything back together again

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Test drive after the repair - perfect!

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58 Carburetor Rebuilding Project finished

Today I got a call from the restoration shop that the 58 was finished.
The 3 dual carburetors were rebuilt completely. The carbs were blasted, cleaned and rebuilt and work perfectly now. I did not think that it would make a difference that big. It´s a real pleasure to drive the car now.
And the best surprise was, that the rebuild cost much less than the initial cost estimate I got.


1958 Cadillac Tri Carb rebuild
during the rebuilding - click on any picture for larger view!

all carbs were blasted and cleaned

the rebuilt front carb

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Finally: A date for the tri-carb rebuild

The restoration shop called and I finally got a date for my carburetor rebuild.
I will deliver the car to them on April 23rd. Looking forward to it.
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The 58 is at the restoration shop.

The 58 was delivered to the restoration shop to have its 3 dual carbs rebuilt.
It made the drive there without catching fire again ;-)
The restoration shop will take care of the carbs now.

One of the carbs caught fire last year at my own wedding and since then I could not drive the car.
Also the air cleaner will have to be repainted due to the burnt cover.
Hope everything will be fixed soon and I can finally drive my 58 Seville.

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