4A-C Carbuator - Toyota Nation Forum : Toyota Car and Truck Forums

semdj · 02-20-2006, 12:43 PM

I have a 1986 Toyota Corolla LX 4 Door Hatchback with the 4A-C Engine - Carburated, with an automatic transmission.
Does anyone know where I could get a manual for the carburator - a complete set of instructions to be ale to adust the carb properly. My problem is that the engine idles rough when in gear standing at a traffic light, but soon as you apply the gas or put it in nuetral, it smoothens right out and runs like a charm at all other speeds. I have replaced all the plugs, plug wires, rotor, air filter, checked all vacuum lines, etc. I have tried all kinds of adjustments on the carb but still find it to idle rough. Help please!!!!!!!!!

Corrolla Boy · 02-20-2006, 04:08 PM

im pretty sure that if there was a problem with the carb it would do it if it was in nuetral as well as stopped with the clutch in

semdj · 02-20-2006, 04:32 PM

If you note I said my car was an automatic Therefore NO Clutch to press in
It helps if people read carefully

punter · 02-20-2006, 04:41 PM

Theres not really a hell of a lot you can adjust on the factory carb, but there is plently of things to wear out.

What rpm does it idle at when stationary in drive, and what happens when you just turn the idle up. Or have you already tried that.

Corrolla Boy · 02-20-2006, 04:57 PM

Quote:

Originally Posted by semdj

If you note I said my car was an automatic Therefore NO Clutch to press in
It helps if people read carefully

my bad i had just read a thread about manual trannies and it was stuck in my head

Hemi3TC · 02-21-2006, 06:30 PM

Egr valve could be stuck open. It is only open when cruising, acellerating.

hemi3tc

larrymoencurly · 02-21-2006, 08:07 PM

I recently had the same symptons with the same kind of car, and they were caused by bits of broken-off rubber floating around inside the carb and clogging the idle circuit and float valve. The remaining rubber was rock-hard and easy to crack. I took apart the carb, and now everything is OK, but maybe all you have to do is remove the top of the carb to clean out any debris and orfices. If your carb was like mine, you'll probably want to clean off the top before disassembling it.

gorka · 02-21-2006, 08:09 PM

go 2 www.autozone.com put the year and the car and there it is!!!!