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Author Topic: Carburetor Issues  (Read 1453 times)

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Offline Walston

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Carburetor Issues
« on: April 21, 2016, 06:21:58 PM »
Hi guys. I am a newbie here but not really a newbie.

I recently bought a 1929 Mercedes Gazelle replica with a 1980 Pinto drive train. It was factory built in 1981 at Classic Motor Carriages in Florida. It has 20K miles and is in incredible shape. It has not been driven much as you can tell from the mileage.

The car idles great and accelerates perfect up to about 25 MPH, but it just won't go much faster. Seems 2500 RPM is the limit. Since it acted like only the idle part of the carb was working, I bought a rebuild kit and I just rebuild the carburetor (Holley 5200) and I found sludge in the gas bowl and the main jets were plugged. I felt certain I found the issue. I cleaned every passage I could find. I replaced all the diaphragms and cleaned all the jets. I just drove the car and it frankly is about the same. It will rev to 5000 rpm easily in park, but 2500 is the max driving. Vacuum looks good according to my gauge. All the emission stuff is just like is came from the factory. I also installed a new fuel pump and new filter. I flushed the gas tank and it has fresh gas in it.

I replaced PCV, plugs, wires, cap and rotor. Timing is right on and the advance seems to be working properly.

I am an experienced "shade tree mechanic". Rebuild many many old cars and tractor engines from soup to nuts.

Right now I am stumped. Could there be passages in the carb that I have not got clean. Any ideas guys?
Walston

Offline Walston

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Re: Carburetor Issues
« Reply #1 on: April 21, 2016, 09:02:28 PM »
I had an idea it may be a plugged catalytic converter, but I disconnected it and it ran the same way.  :(
Walston

Offline robertwwithee

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Re: Carburetor Issues
« Reply #2 on: April 21, 2016, 09:02:47 PM »
I'd verify timing next.

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Offline pinto_one

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Re: Carburetor Issues
« Reply #3 on: April 21, 2016, 09:34:46 PM »
Does it have a pinto tank or a after market tank , most tanks have a strainer at the end of the pickup tube in the bottom of the tank, did you look at it , I have seen these sludge over before and cut down on the fuel flow
76 Pinto sedan V6 , 79 pinto cruiser wagon V6 soon to be diesel or 4.0

Offline Walston

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Re: Carburetor Issues
« Reply #4 on: April 21, 2016, 09:42:06 PM »
Timing is correct, I checked it twice.

The tank is a Pinto tank. I will check that out, Thanks.

Any chance that a bad Ignition Control Module could cause this?
Walston

Offline pinto_one

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Re: Carburetor Issues
« Reply #5 on: April 22, 2016, 06:29:46 AM »
The ign module will work or it will not , does sound like you have a fuel problem , you may have to put a tee in the fuel line between the pump and carb and route the gauge inside to watch it when you drive to figure if it's the carb or fuel supply, drive until the problem shows up , you should have 4 to 6 pounds of pressure, if you do its in the carb , if not it's the supply, since you do have a pinto tank remove the sender , the strainer is at the end of it ,
76 Pinto sedan V6 , 79 pinto cruiser wagon V6 soon to be diesel or 4.0

Offline 74 PintoWagon

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Re: Carburetor Issues
« Reply #6 on: April 22, 2016, 07:35:01 AM »
Check tank ventilation also..
Art
65 Falcon 2DR 200 IL6 with C4.

Offline Walston

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Re: Carburetor Issues
« Reply #7 on: April 22, 2016, 10:16:10 AM »
The Ignition control module was bad. I swapped it out this morning and now I can hit 4200 rpm driving. It accelerates well and I can now go 55 up hill. I could barely get to 45 downhill before. The pinto was 0-60 in 10.7 seconds so it is not set up to be a race car, but I can beat that now.

Walston

Offline Walston

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Re: Carburetor Issues
« Reply #8 on: April 29, 2016, 08:47:23 PM »
I had a fair bit of crap in the gas tank, so I replaced the gas tank and sending unit. I got them from Rock Auto.
Walston

Offline 74 PintoWagon

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Re: Carburetor Issues
« Reply #9 on: April 30, 2016, 07:23:25 AM »
Glad to hear you got it fixed..
Art
65 Falcon 2DR 200 IL6 with C4.

Offline Walston

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Re: Carburetor Issues
« Reply #10 on: May 01, 2016, 01:45:29 PM »
Yup, runs and drives Great.
Walston