Now I have time to address this really annoying ....
Cold engine starts fine. Drive for 5 minutes - runs fine. Temperature needle just under the symbol on the gauge and it does this rather bothering stumble/hesitation when acclerating from 0. It is almost like it was running too rich. This occurs once or twice. It may stall. Once the needle is in the middle it is fine.
dug320 wrote: Now I have time to address this really annoying ....
Cold engine starts fine. Drive for 5 minutes - runs fine. Temperature needle just under the symbol on the gauge and it does this rather bothering stumble/hesitation when acclerating from 0. It is almost like it was running too rich. This occurs once or twice. It may stall. Once the needle is in the middle it is fine.
I've had this problem to varying degrees with every one of the 4 or so 3AC engines I've messed with (and even more carbs). It's just another reason I yearn for and EFI engine in my tercel 4wd...
My opinion is that 3A-C engines screw up more from being too lean than too rich. This is an engine made towards the end of using carbs, when they tried to make them as lean as they possibly could and the challenge in that is making it so they don't occasionally go too lean. SO in otherwords I'm leaning towards the lean diagnosis.
Choke opening too early? That can be adjusted by adjusting the choke spring, rotating the plastic housing on the side of the carb. If the vacuum-operated choke opener is opening it too soon, the cause of that would be the TVSV, which can be tested.
If all the carb related devices are working the way they should, or if you don't want to fuss with them and would rather do something easier, you can adjust the idle mixture screw if you drill out the factory installed plug on the base of the carb. Some have found that this eliminates their hesitation.
And I just realized, I have given one of the 'polar' answers that drove away one of our previous members: Some say it's too rich, others say it's too lean! Someone else might come along and say it's neither, but ignition related instead....
It can be any of. My problem is being traced to any of those. Its acting like a small engine would running too rich, but I've been told it does it running lean. Its also acting like the sparks aren't fully firing. I cleaned the crap out of the carb (in both senses) and it idled a little better. I also adjusted the idle mixture down to get the idle away from 1750. It now sits around 1250-1500 RPM. Still getting terrible mileage at 16 mpg. I'm now trying to convince the folks that the $450 kit is worth it. http://www.carburetion.com has good deals BTW.
Assuming I properly tune and jet the Weber, what kindof mileage should I see? 20? 25? I really want to see 30 (was able to do it on the 86 before the frame and carb farted out) but dunno if I can.
Still looking into that TDI conversion...
RIP 10-07- 1984 Toyota Tercel SR5 4wd Wagen 6 speed
RIP 04-05- 1986 Toyota Tercel SR5 4wd Wagen 6 speed
So that $450 kit is for a Weber? That just might be worth it.
The Weber is tuneable so if it gives you too much hydrocarbon on the emissions test you can make it run leaner.
check the engine fuse and the throttleshaft for play.may need the mixture screw adjusted or removed and the port cleaned out.moisture under dist cap? washed the engine lately?
