Choke with FI

SwiftRunner

SwiftRunner

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My '94 4Runner has been taking a long time cold starting. A while ago the check engine light was turned on as well. I did the OBD with a paper clip and came up with a message that stated the engine was running too lean a mixture. I turned it over to a dealership mechanic. He said the Oxygen sensor was bad. I replaced it. The check engine light went out, but the vehicle continued to be hard to start cold. I will have trouble paying for mechanics time right now. I wonder if there is a simple method of adjusting the choke. All my experience up until now has been with Carbureted engines.
 
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I think the closest thing to a choke would be the Cold Start Injector. Its located in the top of the plenum on the left hand side right above all the vacuum hoses. Its part of the fuel system, and provides extra fuel for starting
when cold.

According to manual:
"Fuel is injected into the intake manifold according to signals from the ECM.
When starting, the cold start injector operates when engine coolant temperature is less than
70° C (158° F), injecting fuel into the air intake chamber to improve startability."

Follow the sticky for the link for the manual, will show you where it is and how to test.

That being said, slow starting could be any number of things: low compression, old plugs, old wires, cap/rotor, etc
 
Choke is only for carburetors.

Cold start fuel injector for EFI.

Well, at least you got a new O2 sensor .. too bad the stealership was involved .. hope they didn't charge you for their diagnosis..
 
Probably because they are covering a wide range of years and models. Your only options for compensating for cold starts is the cold start injector and the ilde up valve below the throttle body.
 
turboSR5 said:
Probably because they are covering a wide range of years and models. Your only options for compensating for cold starts is the cold start injector and the ilde up valve below the throttle body.
Click to expand...
Actually I was thinking about the cold start injector when I wrote Choke. I don't know about the idle-up valve but will consult the manuals about them. If the Cold Start Injector doesn't work, I will replace it. However, I suspect that the engine has been running too lean after starting. Could it be the engine temp sensor? I wonder if it may be defective and giving a cold engine signal constantly. Where's that little bugger?
 
Cold Start Injector

Yes, Turbo. I'm going to do the test for the ColdStart injector today, I hope. Here's a photo link. I bought an auto stethoscope yesterday.
 
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Your picture says this: Cold Start Injector on 3.0 V-8

Don't you mean V6?

and do you mean the Coolant Temperature Sender?

The Temp Sender is with the other sensors behind the plenum, next to the firewall, and a bit down below where you have to reach. My Temp Sender can be pulled directly.

Swifty, Haynes & Chilton manuals blow.
 
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The photo caption was corrected. It is the Cold Start Injector. I don't know why anyone would question a Test published anywhere. I ran the test once, it's simple enough, and will repeat it. However, it seems the CSI-Boston works.
 
From the Chilton guide on Page 1-16 under the heading PCV Valve and sub-heading See Figures 47 and 48 I found "2. Locate the PCV valve in the cylinder head cover . . .". Both photos make it quite clear what the valve looks like and where it is found. They leave it up to you to find the cylinder head cover which is under the Plenum.
 
Nice double-post.

That's not what the Chilton said (the one that covers a 1988 4Runner)

It said something about "no PCV valve, but instead uses orifices to ventilate the crankcase"

If the book you're looking in doesn't cover the year 1988 than you're looking in a different Chilton than the one I'm talking about.
 
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I have a second generation Chilton Manual, 89-96 covering all U.S. and Canadian models. Perhaps the '88 is as described in your manual. Perhaps the translators made some kind of mistake. Whatever, when it comes to using manuals, etc. I try and access as many sources as I can. Chilton can have something that Haynes doesn't and visa versa. Factory information can be wrong, too. I've been working on used vehicles for more than 40 years and have seen amazingly bad info come in parts catalogs, etc.
 
SwiftRunner said:
I have a second generation Chilton Manual, 89-96 covering all U.S. and Canadian models.
Click to expand...

It's not a "2nd Gen only" manual really, since it covers 1989 (1st Gen) and 1996 (3rd Gen)

anyway yeah, I'm only talking about the Chilton that covers the model year 1988.
 
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Praise the Lord!!!! You won't continue to sidetrack this thread. In fact, I am going to start a thread which is more problem specific.
 
No, I have learned to ignore your messaging. I found the trouble, two bad spark plug wires. Mikedks in his first response gave me the heads up.
 
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