Question about 1987 Toyota Corolla 2 Door

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I just put in a new carburetor in my 87 corolla sr5 and it has cold start problems and the idle wont stay at a set rpm all the time

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I have one of these and replaced my carb too. I never changed the gaskets because they are a special order item. Runs good, except for idle when cold. It passed all the emission test and I drive it regulary. So I did the following on mine.

This seems to be related to a design in the cold start system on this engine It is the AAP . That is the Auxliary Accelerator Pump. You'll notice a small vacuum hose going from the front left bottom side of the carb to a multi-hose valve on the water inlet. The AAP gets a vacuum thru this multi-valve when cold, if the vavle is working right. The AAP hose connects to the bottom of this valve. As the valve warms up it cuts off vacuum to the bottom hose and feeds it to the top hoses, thus cutting off the vacuum to the AAP and thus extra gas during warm up.

As a test remove the bottom hose off of this mlti-valve and connect directly to the vacuum feed to this multi-valve on the intake. It is just a couple inches away on the intake manifold. Then start the car when cold. Does it idle better.?

Also the part on the carburator where the hose goes to, the AAP, it ruptures and gas gets sucked into the intake thru the vacuum line. The #1 cylinder spark plug will foul out during normal driving, but this is not your problem yet.

Posted on May 27, 2009

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You probably have vacuum leaks somewhere. Be sure your base gasket is tight, and all your hoses are tight and not cracked. Use a length of fuel hose held to your ear with the engine running, and listen for a hissing.

Posted on May 18, 2009

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