3tc bogs from idle - Toyota Nation Forum : Toyota Car and Truck Forums

Ajb2591 · 12-07-2008, 01:41 AM

Hello, I'm new to this fourm...

So heres the story. I recently inherited my dads old TE72. I changed the wires and sparkplugs, cap rotor and whole distributor, put a high performance coil and fuel pump, new fuel filter, new 32 36 weber with air filter, checked all the vaccum hoses, changed the motor oil and filter... But I still have this problem with accelerating from an idle, or bascially in first gear in general. It's automatic. When from a stop, I punch the gas, the engine will stumble and either die, or pick up and go, but not in a normal speed (fast). Ignition timing is fine. Shot it with the light at a friends house, all is fine and dandy with that... The oxygen sensor and other vaccum nonsense is all disabled thanks to my father, so it can't be related to that. The only thing I could think of would be something in the engine, since when I changed the oil it made a noticeable difference. It's been sitting for six years so I guess an oil change would make a difference for any car.

Also, when the engines cold in the morning, I have to feather the throttle or it will die. Once it warms up it runs normally (or as normal as it will get). Don't know if this is related to the problem...

Any ideas?

spawn7037 · 12-14-2008, 10:00 PM

Got a few questions, Was the weber new or a used unit? (could have a bad accelerator pump) Did you do a compression test? (I know it sounds dumb, but it might tell you more) and Have you tried some of that engine cleaner you put in your oil? (seafoam or something down those lines)

Ajb2591 · 12-22-2008, 04:09 AM

Quote:

Originally Posted by spawn7037

Got a few questions, Was the weber new or a used unit? (could have a bad accelerator pump) Did you do a compression test? (I know it sounds dumb, but it might tell you more) and Have you tried some of that engine cleaner you put in your oil? (seafoam or something down those lines)

Brand new, right from the box carburator. I haven't done a comression test, but I would asume compression is part of the problem because I have blow-by. Would uneven compression be part of the problem?

I haven't tried any engine cleaner in the oil, in fear that it might break loose too much gunk and cause something to clog. My next oil change I plan to use something though. I asume most of it has been worked loose by now.

btw thanks for replying. Started to get kind of lonely on this fourm...

spawn7037 · 12-22-2008, 11:33 AM

Hey man, don't worry about it. If no one replies it won't get done. I had blow by on my 4ac corolla, car ran ok, idled a little weird, the 3 cylinder was gone. I don't think that would cause what you're describing though. Did the carb come tuned from the box or did you tune it yourself? Also is it a factory carb or a weber?

Ajb2591 · 12-22-2008, 08:29 PM

It is a 32 36 weber. I'm pretty sure it didn't come tuned, all I adjusted on it was the idle mixing screw. That's pretty much all you can adjust on it unless you change the jets I guess. Are the jets that it came with too big/small for a 3tc engine?

spawn7037 · 12-23-2008, 11:34 AM

I wouldn't think the jets would be wrong if the carb was specified for the 3tc motor. I was wondering mainly if you put another factory carb on because if your vacuum hoses weren't hooked up right you might have idle problems and what not. Does the distributor on the 3tc motor have a vacuum advance on it? If so and you didn't hook it up it could cause you to have problems similar to this.

Ajb2591 · 12-28-2008, 08:14 PM

I have the vacuum advance hooked up, and I am fairly sure they are connected correctly, but I will definatly double check with my book. Everything else other than the vacuum advance that is connected to a vacuum is blocked off. It is possible that the origional lines my dad had hooked on there was wrong to begin with. I will also check the vacuum lines for blockage and change them with new ones, since they are old.

PS
It is a completely new distributor core, router, cap, and vacuum advance. The old vacuum advance that was origonally on it was no longer holding a vacuum, and it was cheeper to buy the whole core with the vacuum advance on it than just the vacuum advance by itself.

spawn7037 · 12-28-2008, 08:48 PM

I was always under the impression that the vacuum advance ran off of one vacuum line off the weber and that would be split and run to the vacuum advance. I read a 4ac weber install walkthru one time on this, have the link saved but they must have deleted the archive cause when I try to go to it now it just takes me to the front page of the forum

Ajb2591 · 01-15-2009, 08:19 PM

I'm going to try a bunch of stuff as soon as I hunt down some vacuum hose and some time... School is getting pretty busy since its the beginning of the 3rd quarter of my senior year lol. Also, my car is being painted. I should be getting it back somewhere around the 16th.