This morning running around in the Gp, she'll hardly idle. Have to put it into nutral at the lights. Shudders at idle. Runs nice just off idle, smooth as can be at speed. Nothing else seems out of the ordinary. New plugs points and cap last fall. Still original '67 wires. On my second tank on Sunoco 94 since briging it out from storage. full tank with StaBil overwinter. Had it out last night and gave it a little bit of a pounding on the highway (now the muffler is leaking, lol!). It's a Qjet 327/275.
Is a dirtly idle circuit in the carb, a carb adjustment, fuel filter or have the points been burned? Or somthing else entirely?
Any suggestions?
Cheers, Mark
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65 Laurentian post, 67 Grande Parisienne 4 door HT.
Just a couple things you've probably already checked...sounds like a small vacuum leak. I had that last year on my son's Hurst Olds. It was a small split in the trans vacuum modulator hose. I've also had it where the tranny fluid was low and when I put the car in drive it wouldn't idle to well. Added fluid and all was good.
Checked for Vac leaks Rob, nothing obvious, the lines all appear to be in decent shape, still soft, Tranny fluid must me ok since I took Carls advice..man I never thought she could put down such a patch! But she still idles rough, adjusting for higher idle helps a bit though.
But guess what I found...no fuel filter in the carb! And a nice pile of silt in the bottom of the filter throat. Not good.
Put a filter in, but it's probably too late. Who is the master Qjet builder around here, and how much would it be to have it gone through? I dont need a restoration on it, but a do have a spare that I can use in the meantime.
Still have to check the timing and dwell.
Cheers, Mark.
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65 Laurentian post, 67 Grande Parisienne 4 door HT.
There could be some crap in the tank making it's way up to the engine. You might want to drop it next time you are low on fuel and have it boiled. In the meantime I'd put a filter at the tank as well.
How many miles on engine??? Could be the timing chain has "jumped a cog or two" Rock the engine back & forth with the fan with the dist. cap off & see how much "slop" is in the chain, by watching rotor movement. Hope that's not it, could be your fuel filter problem, thats an easyer fix!!!!
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Some times I wake up GRUMPY, but today I let her sleep in !!!!!!!!BLACKSTOCK Ont.
There could be some crap in the tank making it's way up to the engine. You might want to drop it next time you are low on fuel and have it boiled. In the meantime I'd put a filter at the tank as well.
The Gp is idling fine tonight, but still has a off idle stumble... go figure. But I do agree with Todd, it's probably time to have the tank dropped and cleaned. It needs a sender anyway and I'd like to clean it up on the outside. It's like new under the chassis spray and only one very small dent near the front.
If I feel ambitious enough, I'll take it off and have it done at Carb rebuilders, thanks Mark! It looks really nasty on the outside and I'd be willing to bet it's never been off in 43 years.
It's also time for a breakerless ignition.
Cheers, Mark
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65 Laurentian post, 67 Grande Parisienne 4 door HT.
When I had my 54 Chevy. The car would run great most of the time. However, sometimes after a turn, or accelerating it would stumble and almost quit. Turns out there was a pile of crap in the carb and would sometimes restrict fuel. I bet that's what's going on with you. Of course the 1 bbl was a cinch to rebuild compared to a Quadrajet...
Well, the idle problem has been on and off over the last few days. So today I pulled the carb thinking I'd send it to Carburator Rebuilders in Toronto. I'd simply drop on a spare Quadrajet I had and use it until the other one gets done. Wrong. My backup carb has a larger line size inlet flare in the filter nut. And my old filter nut will not work on this carb. Funny, I didn't even know what this old carb was until I looked up the numbers, its from a 67 327 with 275 horse but with a standard transmission. #702 7203. Carter built G6 code (July 1966). Rather neat to have. To think I almost threw it out.
Anyway, I'm going to attempt to go through this original carb myself. It's absolutely dirty as we spoke of before. When I flipped it over, the nastiest and sandy brown red gas came out onto the bench. It's full of crud. It's going to rain this week anyway, so I'll give it a try and not worry about driving the Gp. The carb body still has the gold colour and doesn't appear to have any corrosion anywhere. Likely never been off.
I'll unlock the dark mysteries of the Quadrajet. Judging for what I've seen on the net, it isn't that difficult, and if I fail...it'll then go to the rebuilders!
Never paid much attention to carbs and numbers, but I can now see why numbers and having the correct carb can mean a big deal to those who care.
Who has the best rebuild kit for these carbs?
Original and correct Rodchester built carb. #702 2702.
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65 Laurentian post, 67 Grande Parisienne 4 door HT.
One comment on the video. When they install the throttle shaft bushings, I have been taught the proper way to install a bushing is to have a piece of an old shaft of some sort inside the bushing to keep it round when it gets pressed in. Otherwise hammering on it could distort it. They just pounded away on it. I could hardly believe that when I saw it!
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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles
1966 Grande Parisienne, 396 1 of 23 factory air cars
But I'm hoping not to have to do the shafts. The carb only has 58K on it and the shafts feel tight as can be. We'll see.
The carb really did everything well...except idle... recently. So it's really just a teardown, cleaning and blowout. New power pump, new needle, set the float, re-assemble with new gaskets and away I'll go...or does this all sound rather far fetched?
Who makes a good kit for this era af Qj? I have a Carquest around the corner...just go with them? GM?
Cheers, Mark
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65 Laurentian post, 67 Grande Parisienne 4 door HT.
Went with the Standard Motor Products Hygrade kit 497A. The guy at Carquest was great. I tried him with "I need a kit for a 67 Chev Quadrajet" he laughed thinking I was clueless and said "you'll need to be a little more specific my friend". I then blurted out 7027202! I knew It by heart! $20, good for a basic kit.
Anyway, I broke the carb down and sure enough the float bowl was full of rusty residue, in fact, when I took the primary jets out, the crud was packed in pretty much solid underneath them. I'm surprised the engine actually ran, if at all. Had the carb a filter in it, this could have been avoided. Who knows how long it went without. But it's obvious the gas tank needs some attention.
Sorry for the poor image. but I can't reshoot, she's all clean now.
I wondered how I would actually get the carb parts clean, and It was my intention to try to buy a 5 gallon can of somthing specifically formulated to do this job. I got the shock of my life...Carquest wanted $250 for 5 gallons of Gunk Hydroseal II. But they had a 4L container...for $50 bucks....Fifty Bucks for the solvent...$20 for the kit, go figure!!!
The counter guy said it would work well, and I've never used any degreaser near as good as this! With some soaking and brushing the big parts in a bucket and on a cooking sheet, keeping all the small stuff in a coffee can, years of crud and even carbon came right off. This product has a watery maple syrup consistancy, and clings to the parts. Doesn't even smell too bad or strong, but It'll sting your skin if you prolong exposure to it. Tomorrow I'll blow out all the fine passages, and the body with some TechSpray clorinated solvent in a can.
When I was done, I put a fine paint strainer filter in a funnnel and poured it all back in the jug to use later if ever needed. Remarkably, most of it actually made it back. The bottom of the pan and bucket are filthy. So this 4L jug could last a while if you're carefull.
So far so good, and the carb parts actually look like new when clean. The primary throttle shaft shows a little play, but nothing major.
Cheers, Mark
-- Edited by cdnpont on Wednesday 7th of April 2010 10:08:19 PM
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65 Laurentian post, 67 Grande Parisienne 4 door HT.
Updated images and progress reports on this would be great Mark. I like following stuff like this.
50 bucks for 4 litres......... Ouch, but what can you do? I had heard of some brands that are pretty lame because the "green" brigade had made them take all the nasty chemicals out of that stuff. I'm glad to hear you found one that works.
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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles
1966 Grande Parisienne, 396 1 of 23 factory air cars
This was by far the best solvent I've ever used Carl. The clinging nature of it allows that you don't actually have to dunk all the parts completely. Simply brushing fresh solution all over the bigger parts every hour or so will do the trick over 4 or so hours. All the small parts you give a swish in a coffee can at the same time. And most of it makes it back to the jug.
But I'm actually in a quandary about the slight shaft play. Do I do the bushings now. They're not bad, but how precise do they need to be?
Can I even buy bushings in town? If so, I might do them. But what I now realize is that the screws holding the butterflys on the shaft will need to be ground away where they pass through the shaft. They are flattened out... Heh, It's been a while since I've done a carb (2 jets) so don't laugh! Never done a Qj.
Mc
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65 Laurentian post, 67 Grande Parisienne 4 door HT.
I have not seen many guys selling those bushings. Good question.
I have done one QJ ever, 20 years ago on my 427 in the Acadian and it worked excellent but I never did the throttle shaft. Funny that Musclecar TV show on carbs never mentioned the screws being ruined to take it out.
I would assume whoever sells bushings would have new screws for the shaft maybe???
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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles
1966 Grande Parisienne, 396 1 of 23 factory air cars
Those same screws would not be an issue going back in. As long as they were perfectly clean (as well as the shaft) and had a good...I'll say...permanent Loctite on them. But forget it on a high dollar engine? Nawww, dont worry.
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65 Laurentian post, 67 Grande Parisienne 4 door HT.
