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1979 Rx7 will only start with starting fluid
So I just picked up this car . It’s a 79, has a 13b(supposedly bridgeported , don’t care either way honestly) , has a header , Weber idf with a choke . I drained all the old gas , deflooded the car since it’s been sitting for unknown amount of time . Got it started with starting fluid . Doesn’t like to idle lower than like 2000 rpm . Did some brake work to it . Anyway I can’t get this thing to fire up without ether , hot cold whatever . I’m sure the carb needs adjusted but I’m wondering if I’m missing something . Thanks |
Have you verified that you are getting fuel to the carb? I know a big culprit can be the fuel filter.
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yes, actually my method of draining the tank was to disconnect fuel line at the carb and key on to pump fuel into containers. sorry should've mentioned that
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Vacuum leak I would assume. Typical issue when there is a high idle.
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quick update, so my idiot self was being paranoid about flooding it so I only pumped the gas like once and It never started. I pumped it 3 times next time out and it fires up easy now, but the idle is not getting any lower. I've got an intake manifold gasket on order so well start there and hope for the best lol. thanks for the suggestions so far.
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Originally Posted by etizz
(Post 12287607)
I've got an intake manifold gasket on order so well start there and hope for the best lol. thanks for the suggestions so far.
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How high is the engine idling?
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ok update, replaced the intake manifold gasket. old one was gross. still cant get it I guess I should say "stay running" under 2000 rpm, not idling, I'm sure someone with some weber carb and rotary knowledge could probably get it to work but I'm a bit of a novice when it comes to either. lol any help would be appreciated. carb has 3 vacuum ports, 2 I have the omp lines going to, the other is blocked off. brake booster vacuum comes out of the intake manifold and seems to be fine no cracks that I can tell. i scored a fpr and fuel pressure gauge off of a parts car i was getting parts from, only have hooked the gauge up, pump is putting out around 5 psi right now.
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That fuel pressure is high for a weber. Should be 3.5 to 4 I think.
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Well that would make sense when the engine was running I saw fuel running out of these tubes near the top that didn’t seem like that should happen lol. That much extra fuel would explain why it wants to die at lower rpm. So I just ordered a fpr for 1-4 psi cuz I think the one I have is for 4-9psi . So we’ll see what happens. |
OK so I installed the regulator set the pressure to 2.5 psi nice and steady on the gauge and I still can’t get any different results I’ve played with the mixture screws The idle speed screw to me it just seems like there’s too much fuel and it’s dying at lower RPM but I can part throttle Revit to 6500 smooth as can be so I haven’t checked timing yet . Any ideas ? I’d really like to get this thing on the road ASAP but I’m not sure what to do now |
Well, if I can remember correctly, m Weber is getting about 4.5 psi. I set the idle screw all the way down, then it was about 2 turns out. I think. I'm deployed right now and cant exactly recall, but I have my idle down to about 900. Check to make sure the throttle is seating all the way down and not open. Some times there is a screw that prevents the throttle from closing.
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Ok I will try that . Right now my throttle blades are maxed cuz I’m trying to slowly lower it down with small adjustments here or there it just seems like there’s no way it’ll idle that low . There’s also no return spring for the linkage like I’ve normally seen on carbs , some times it’s not coming all the way back. I see the hole in the linkage where a spring may go but there isn’t one , I can try that too if needed |
I have a spring that pulls my throttle back to the seated position. It might not be how it should be, but it worked when I bought it, and I haven't had a reason to change it. It pulls the throttle back, and that's what counts.https://cimg7.ibsrv.net/gimg/www.rx7...af91a80df1.png
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Take a gander at this link; helped (Is helping) me a lot with my Weber 45 DCOE:
DCOE ADJUSTMENT LAYOUT TYPICAL INSTALL Scroll down to the "Tuning and Adjustment" section for the important stuff, and a quick little important excerpt: "If your mixture screw is out more than one turn like 1 and 1/2 turns then your idle jet is too lean, go up one half size on the Idle jet. If you mixture screw is not out one full turn, something like only 1/2 turn out from seated then your Idle jet is too rich, go down one half size on the idle jet." Finally, there's an awesome collection of information and references at this link by installer67: https://www.rx7club.com/1st-generati...rences-882842/ (It'll also explain the weird terms behind carb jet sizes) Good luck, man |
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