Sparky232 Posted January 16, 2022 Share Posted January 16, 2022 Hey everyone, also posted this at Desoto.org. Having some issues with my pals 53 Firedome with 276 hemi. Got it running pretty good, but driving notsomuch. It really feels sluggish at low speed, almost like a manual car starting off in second gear. It will shift after getting up to proper speed but it tough getting it there. Reverse goes great! Things we have done so far- Cleaned and rebuilt carburetor with mikes kit. Accelerator pump, float, and metering rods adjusted according to service manual. Idles great, revs great in neutral, bogs and sputters while driving, backfires through carb, power is low. Mixture screws do not effect running even at lower rpm. Tested for vacuum leaks with smoke machine, found small leak at carb plate, repaired, not much change. Timing is 5 btdc at 550 rpm, 15 btdc at 2k rpm. Plugs and wires replaced Pertronix ignition, 12v conversion, exhaust heat valve for choke removed. Mixture screws having no effect concerns me but I can’t seem to find any vacuum leak to cause it unless there’s another reason I’m missing. SOS! Link to comment Share on other sites More sharing options...
TerryB Posted January 16, 2022 Share Posted January 16, 2022 New distributor cap? What coil are you using with the Petronix ignition? Is your distributor advance working? Link to comment Share on other sites More sharing options...
Sparky232 Posted January 16, 2022 Author Share Posted January 16, 2022 New cap and rotor, coil is whatever the one the pertronix called for. I know I checked the vacuum advance before with the suck on the vacuum line test, but failed diaphragm does sound like it would be causing the tuning and vacuum leak issue. Going to double check when it's not freezing my nips off, will let you know 1 Link to comment Share on other sites More sharing options...
Oldtech Posted January 17, 2022 Share Posted January 17, 2022 (edited) 15 degrees at 2000 sounds low. I would expect around 20 so maybe an advance issue- either the flyweights or vacuum. Chilton shows 15 degrees centrifugal at 1900 AND 10-12 of vacuum. total 25-27. ( This is crankshaft degrees) Edited January 19, 2022 by Oldtech (see edit history) 1 Link to comment Share on other sites More sharing options...
Sparky232 Posted January 19, 2022 Author Share Posted January 19, 2022 Well the vacuum advance canister is indeed kaput, that certainly explains a lot ha! So now the question is where to find a replacement. I've looked online and pretty much all the ones I've found are for distributor model xxx-2023, we have an IAZ-4002A. Also cant seem to find any info on interchanging with others. I take that back, I did find one at 200 bucks oof. Link to comment Share on other sites More sharing options...
TerryB Posted January 19, 2022 Share Posted January 19, 2022 Check with a forum member Old buicks 2, he sell this kind of stuff. 1 Link to comment Share on other sites More sharing options...
TerryB Posted January 19, 2022 Share Posted January 19, 2022 (edited) Ok, update…. Your IAZ-4002A distributor is correct for 1953-54 DeSoto. The Auto-Lite vacuum chamber for it is part number IAZ-2023RA. Hope this helps! I have a few non-Auto-Lite catalogs I can check if you need. They often use VC-XX type ID numbers. Edited January 19, 2022 by TerryB (see edit history) 1 Link to comment Share on other sites More sharing options...
Sparky232 Posted January 20, 2022 Author Share Posted January 20, 2022 Ooooooh man I was confused and thought the 2023 number was a different distributor. Much appreciated! I recall seeing a VC-21 or 22 that looked similar to what I need Link to comment Share on other sites More sharing options...
Sparky232 Posted January 20, 2022 Author Share Posted January 20, 2022 Tried to send OldBuick2 a message but got a message saying I haven’t posted enough to send messages or some deal Link to comment Share on other sites More sharing options...
TerryB Posted January 20, 2022 Share Posted January 20, 2022 5 minutes ago, Sparky232 said: Tried to send OldBuick2 a message but got a message saying I haven’t posted enough to send messages or some deal I think it’s 12 posts or something like that to get Message privileges. Roberts Motor Parts and Andy Bernbaum are dealers too in MoPar parts. There are several similar names in the form so be sure it’s Old buicks 2 that gets your message. Good luck! 1 Link to comment Share on other sites More sharing options...
Sparky232 Posted January 20, 2022 Author Share Posted January 20, 2022 Will do, thanks again! 1 Link to comment Share on other sites More sharing options...
Sparky232 Posted January 21, 2022 Author Share Posted January 21, 2022 22 hours ago, TerryB said: I think it’s 12 posts or something like that to get Message privileges. Roberts Motor Parts and Andy Bernbaum are dealers too in MoPar parts. There are several similar names in the form so be sure it’s Old buicks 2 that gets your message. Good luck! This is my 12th post, wish me luck haha 1 Link to comment Share on other sites More sharing options...
TerryB Posted January 21, 2022 Share Posted January 21, 2022 Good luck! Glad to hear you are making progress on the car diagnosis! 1 Link to comment Share on other sites More sharing options...
Sparky232 Posted January 21, 2022 Author Share Posted January 21, 2022 3 minutes ago, TerryB said: Good luck! Glad to hear you are making progress on the car diagnosis! Thanks again! Just found in the Q&A that 14 posts give clearance to send messages, so heres 13 1 Link to comment Share on other sites More sharing options...
Sparky232 Posted January 21, 2022 Author Share Posted January 21, 2022 Just now, Sparky232 said: Thanks again! Just found in the Q&A that 14 posts give clearance to send messages, so heres 13 Aaaaand 14. Link to comment Share on other sites More sharing options...
TerryB Posted January 21, 2022 Share Posted January 21, 2022 1 hour ago, Sparky232 said: Aaaaand 14. Atta boy…I just noticed I’ve now done more than 6,000 posts. I guess I talk too much😀. Link to comment Share on other sites More sharing options...
Old buicks 2 Posted January 21, 2022 Share Posted January 21, 2022 Sparky232, got you message, I will check later today. shop and inventory is COLD, just started the wood stove. Tom Link to comment Share on other sites More sharing options...
Old buicks 2 Posted January 21, 2022 Share Posted January 21, 2022 Sparky 232,, yes I have one, sent you a PM Tom Link to comment Share on other sites More sharing options...
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