What makes my carb take off at 3k?
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Adelard of Bath
- Top Notch Member
- Posts: 225
- Joined: Tue Dec 07, 2004 10:12 am
- Location: Rochester, MN
When driving my 84 w/ 3A-C, throttle response is crappy....at just off idle, it accelerates smoothly, and a full throttle, it's alright, but anywhere in the middle, it sputters and hesitates and generally sucks. Then, though, as soon as the engine rpms reach 3k or just under, it "takes off" like another engine turned on. What kinda deal is that?
Guessing that that is the second barrel coming on line. Might try snugging up your manifold bolts (easy on the torque) or looking for vac leaks.
Give a boy a gun-give a biatch a cell phone-and pretty soon you almost got yourself a police state.
Orwell said: War is peace! Freedom is slavery. Ignorance is strength...
Orwell said: War is peace! Freedom is slavery. Ignorance is strength...
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Adelard of Bath
- Top Notch Member
- Posts: 225
- Joined: Tue Dec 07, 2004 10:12 am
- Location: Rochester, MN
Hm I really like both of those ideas! I am the first to admit that when it comes to carbs, I stay as far away as I can....prefering the nice fuel injection on my other cars. But I went outside and looked around and sprayed carb cleaner all over the place, things are nice and clean but the same. I didn't find any vacuum leaks except for maybe one small one where the intake man bolts to the head.
But I found that when revving the engine, the secondary doesn't open...should it? I see it is vacuum operated, and I was goign to test it with my recently purchased vacuum pump, but I seems to have an internal connection, damn thing. ruined my fun.
I was driving it around thinking if that diaphragm was ruptured, it could cause interesting vacuum leaks and other problems, and if the secondary wasn't opening, it would explain the fact that the car is the weakest bitch on earth on the highway. I don't expect a 20 year old 1.5liter to do a whole lot but I've been in others that were way better.
But this second theory put forth by Mr Retroloc has merit as well; any suggestions on how to test that? My accelerator pump works nicely, a cute little stream of fuel going in there perfectly. Maybe if I could find the jet, I could stick the straw of a can of carb cleaner in there and spray heh
Is the jet in that "bridge" that goes across each barrell? Or is it in the wall, in the venturi part?
But I found that when revving the engine, the secondary doesn't open...should it? I see it is vacuum operated, and I was goign to test it with my recently purchased vacuum pump, but I seems to have an internal connection, damn thing. ruined my fun.
I was driving it around thinking if that diaphragm was ruptured, it could cause interesting vacuum leaks and other problems, and if the secondary wasn't opening, it would explain the fact that the car is the weakest bitch on earth on the highway. I don't expect a 20 year old 1.5liter to do a whole lot but I've been in others that were way better.
But this second theory put forth by Mr Retroloc has merit as well; any suggestions on how to test that? My accelerator pump works nicely, a cute little stream of fuel going in there perfectly. Maybe if I could find the jet, I could stick the straw of a can of carb cleaner in there and spray heh
Is the jet in that "bridge" that goes across each barrell? Or is it in the wall, in the venturi part?
You dismount the screw on the front of the carb and you'll reach the main jet with a large screwdriver.
The second barrel don't open without sufficient vacuum.
Without load, trans in neutral, it doesn't work.
With one hand you shut off the air for the first barrel while with the second hand you open the throttle. The second barrel should open and the revs raise.
The second barrel don't open without sufficient vacuum.
Without load, trans in neutral, it doesn't work.
With one hand you shut off the air for the first barrel while with the second hand you open the throttle. The second barrel should open and the revs raise.