I have an '87 carbed 22r. I'm having a few problems, maybe unrelated, maybe not:

1) Engine seems to run fine, for the most part. Starts at zero degree temps no problem, after pumping the gas a few times. The cold (fast?) idle starts off at about 1200 rpm, and as the engine warms up, it gradually increases to about 1900 rpm, until it kicks down to about 800 when it's fully warmed up (after a few minutes idling). Any ideas for the gradual increase in idle?

2) Once the engine is warm, it usually is somewhat low on power, until I rev it over ~3700 rpm. At that point, there is a surge in power, and suddenly it pulls a lot better. From there on out, it drives fine. Some days though, the "surge" never happens, and I can barely get over 60 mph on flat ground. Vacuum advance not working right maybe? The carb is pretty damn clean; I had it off a few months ago and there wasn't any buildup anywhere, and everything seemed to work nice and smooth. I don't have a timing light to check if the vacuum advance is working, unfortunately. Any other ideas?

3) Recently, there have been a couple times when I've shut the engine off, and the engine will run on for a few seconds. I've heard of this happening when there is a lot of carbon buildup on the pistons, and with the carbon heated up the engine basically diesels. But, I seafoamed my engine a few months ago and I got NO smoke at all (poured 1/3 bottle directly into carb with engine running). So, I don't think I have any carbon buildup. Any ideas for why it would run-on like this?

Thanks.

In my experiences:

1) Perfectly normal... factory spec it can make it up to about 2600RPM before it kicks down if you leave it idling long enough and it's cold enough.

2) Might want to check to make sure the choke is kicking off all the way. There are 4 steps on the fast idle cam, and it could potentially be hanging up on one of the lower ones, although with and idle of 800 I doubt it.

3) Check the fuel cut solenoid. It's the only item on the carb with two wires going into it. It is supposed to cut the fuel off when you turn the key off. Something about hooking it up to battery voltage and feeling it 'click'


The vacuum advance only advances the timing at idle. Easy enough way to check, just pull the vac lines to it at idle, the RPM should drop, the engine might even die. If there is no change, it's shot (very common). Cheapest new one I've found is from www.1sttoyotaparts.com, 94 bucks. 1922035140

Otherwise just check the usual things... timing, valves, etc.

I was hoping you'd reply, seeing as how you've become intimately familiar with the carb/vacuum advance/etc. lately.

Thanks for the part number, I was having trouble locating that part separate from the distributor.

Thanks,
Andy

Unwillingly, lol. <img src="/forums/images/graemlins/lol.gif" alt="" />

But yes, familiar nonetheless. Wanna know the real pisser? The end result of all this tinkering is I never needed a new carb, just a new vac advance.

*sigh* oh well, at least I gained experience.