Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

90% of 'Carburetor Problems' are 'Ignition Problems'

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73ss:

--- Quote from: Buick73 on January 06, 2026, 01:35:57 PM ---In looking at my pictures up close, does that look like a magnet on the distributor plate? I hadn't noticed that in person.

--- End quote ---

Yes it does look like a magnet fell out. I've had a pertronix installed on my Vette since 1998. It's performed flawless all these years. I did wire it and the coil to full 12V by way of a relay. I didn't want to cut up the harness. The original ignition wire now triggers the relay. We all know stuff made nowadays is basically junk. I've read where their products are not what they once were, I doubt I would get that kind of life out of a new one. The same with points, A set that will rev past 5K is upwards of $80. I recently rebuilt a spare distributor for the Vette (tach drive) with points and installed to test it out. It works great but 5200 RPMs is all it will do before I get point bounce. And it may just be my imagination, but I swear it pops off quicker with the pertronix set-up.

mcx:
…looks like the wrong carb…every 7042240 I’ve built does not have that early style air lid…1972 455 also have a slash cut vent tube…pix#4 seems to show the secondary air valve linkage might be incorrectly adjusted….also check the front dashpot and verify it is functional.

novadude:

--- Quote from: Kenth on January 06, 2026, 09:01:32 AM ---I wouldn't call Pertronix an upgrade, quite the opposite, as they have proven to be a source of endless problems.


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I am with you 100% on this.  I had tried Pertronix ignitors on 2 different cars, and I ended up going back to blue streak points on both.  One of those left me stranded and required a tow.  IMO, they are junk.

von:
There is more than one Pertronix Ignitor version for a Chevy points type dist offered. I have the original #1181 version which has a magnetic wheel trigger rather than one of the lobe sensing units. I would trust the #1181 much more than the others. I've had #1181's in two different Chevelles over the past 26 years with no problems. I've also installed them for others with no problems I've heard of.

novadude:
Seems like some people love them, and others have issues.  The original 1181 is the one that cause me problems.

For my Nova, I have a somewhat unconventional points distributor conversion.  I am using an old hays stinger points plate, reluctor wheel that presses on the points cam, and 70s mopar pick up in a '63 327 distributor.  The pick-up triggers a remote-mounted 4-PIN HEI module that is mounted on a S10 heat sink and hidden out of sight. 

This give me stock points distributor appearance but eliminates points using OEM reliable electronics.  This is not a practical solution for everyone though, as Hays hasn't made these parts in decades.

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