85 Toyota Truck Won't Cold Start - Toyota Nation Forum : Toyota Car and Truck Forums

Crash2 · 01-17-2005, 06:47 AM

Starts and runs great if I pour some gas into the carburator 1st. Otherwise, I have to crank it for 3-5 minutes before it will start. I've verified that the fuel pump is working, and I've opened and cleaned the carburator. It starts fine when the engine is warm. From older threads, it sounds like it could be the "Cold Start Injector", but I'll admit I'm kind of clueless what this is, and where it is! Are there any good carburator sites on the web which could help me here? (maybe with pictures)? thanks for any help!

Smoke · 01-17-2005, 08:07 AM

You do not have a cold start injector on the carb, you have a choke!! Probably needs some attention!! Pull the air cleaner off while it is cold and see if it is closed completely. It is usually set by pushing the gas pedal down and releasing it slowly before doing a cold start!!

Crash2 · 01-17-2005, 11:27 AM

Smoke - Thanks for the response. I'll check the chokes operation and update the thread with results. When cleaning the carburetor, I blew out ports with the carburetor cleaner, and at least one of them blew directly into the throat of the carburetor. I'll look closely at these to see If I can determine which one should be sucking gas in when "choked". Any direction here would help.

D'mon · 01-17-2005, 03:05 PM

You can start your diagnostics by just pushing your gas pedal, then look at the top of the carb. There should be a flap on the top end of the carb and if the engine is cold it should be almost completely closed (after you have pressed and released on the gas), just (I'm guessing) open an eighth inch gap or so. Beyond that, setting it up will need a service manual. Carbs are pretty specific and touchy to being set up right. Do it once and do it right. If you need to get busy on it, get a carb rebuild kit (they are not expensive) and do the whole thing. As a rule, I rebuild the carb at teh same time as I do the first oil change and tuneup once I've bought a new (used) vehicle...at least when it has a carb! The last couple have been EFI, so I may be a little rusty.

D'mon

Crash2 · 01-19-2005, 07:44 AM

D'mon & Smoke - thanks for your responses.

Sure enough, looking from the front of the truck, the flap in the right barrel appears to be driven by the accellerator, and the flap in the left is indeed the choke. The choke does close nearly completely when the gas pedal is depressed when the engine is cold and not running. However, the engine still wouldn't start until I poured gas in the carb (it's 10 degrees F or so). Once started and warmed, the choke automatically opened some. With the engine running, I was able to peer down into the left carb barrel (with the valve open), and see gas coming out of the tube going across the barrel, below the choke valve, but that's probably no guarentee that it's coming out sufficiently when being choked.

Does a carb rebuild kit come with good instructions? Rebuilding it really sounds like something I ought to do if I want it to start consistantly.

D'mon · 01-19-2005, 09:41 AM

Every carb kit I ever bought had detailed instructions and a gauge for measuring the float accurately. However, if the flap is closing it sounds like the choke is working.....I'd say maybe (?) you are running too lean to be able to cold start even with the choke (unless it is not choked enough). What do your plugs look like? Are they whitish or are they chocolate colored? White is bad, chocolate is good (ask any chocoholic!).

Rebuild the carb is still my first suggestion. At least then you know it is 100%, and your pouring gas down the carb suggests it is carb related.

C'mon you 22R guys.....give him a hand. I haven't had a carbed vehicle (except my bike) in years.....

D'mon

Crash2 · 02-16-2005, 06:53 AM

OK. We had a warm break in the weather yesterday, so I went to take off the carburator for a rebuild... When I found that on the front lower section of the carb there is a manual pump which injects gas into the carb throat. This pump is connected to the throttle... So, theoretically, all I have to do is pump my gas pedal a few times before trying to cold start (to literally pump gas into carb intake). and instant cold start! I tried it, and it works! Dang, I wish these older trucks came with instruction booklets!

CASE CLOSED - Thanks for all your helpful suggestions!

toysrus · 12-14-2006, 09:59 PM

Quote:

Originally Posted by Crash2

Starts and runs great if I pour some gas into the carburator 1st. Otherwise, I have to crank it for 3-5 minutes before it will start. I've verified that the fuel pump is working, and I've opened and cleaned the carburator. It starts fine when the engine is warm. From older threads, it sounds like it could be the "Cold Start Injector", but I'll admit I'm kind of clueless what this is, and where it is! Are there any good carburator sites on the web which could help me here? (maybe with pictures)? thanks for any help!

It could very well be that the chock is not closing all the way and letting a little to much air to get by for the cold start . I would try ajusting this .

one way to check this is to step on the pettel twice to set it then to remove the air filter and look in the card to make sure this is closed all the way down for in a carb there is only the tub that brings the fuel to the throat as the air comes in mixing the two . dripping a small stream with the truning of the fuel pump .

let me know how things go .