dogdenii

1988 Toyota 4Runner
3.0 V6 - bone stock

Problem: The Runner starts off with an extremely high idle. After a few minutes, it will start to miss on a cylinder, after a few more mintues, it'll start to miss on two cylinders. Once shut down, it will NOT start.

I've done a number of searches here an everywhere else but would like some more input.

The closest thing that I have found is that the O-rings on the injectors have a tendancy to become rotted and cause the injectors to leak. Also, the possiblity of the igniter getting too hot to perfrom it's job. There are NO codes being putting out.

Side note: Once the engine is shut down, there is a hissing/sucking sound coming from the unit in front of the dashpot.

BTW: My fsm will be here in about a week.

I am familiar with Yotas but I am not familiar with the the 3.0 V6's.
Once the engine stuff is figured out, the IFS comes off, and I'll be switching everything over from my 84 PU.

http://www.lieblweb.com/Events/UCP20...9-2912_IMG.jpg

Thanks in advance,

JDK

dogdenii

Also, when she gets warm, the gas guage goes to "E". Registers fine at start-up.

Thanks,

JDK

rimpainter.com

I vote fuel pump.

Jonathan

I might have to agree.

MTL_4runner

Check the fuel pressure and see if it is staying steady.
That will diagnose that right away.

I am not sure, you might want to check for vacum leaks.
Look for broken / disconnected hoses and listen for any hissing sounds ( mechanic's stethescope).
Use some carb cleaner on a suspected leak (tailpipe will smoke if it is leaking).
Also check usual tuneup stuff (cap, rotor, wires, air filter, fuel filter).

dusty98

Also check your EGR valve.
When mine went the engine idled high, didn't have much power, would stall frequently and then take a few turns to get started again.
Good luck!

dogdenii

The tune-up was completed first.
I have an igniter on the way.
I did check for vacuum leaks and did not find any. However, I did notice that the purge side of the charcoal canister did not have a line.

Since I don't have the FSM yet, I don't know where that line "should" go.

Also, there is a vacuum port (for lack of knowledge) behind the manifold, just in front of the firewall. There is a top and bottom port. the top port comes around under the maifold and the bottom port conntects to the top of the manifold.

The Fuel Regulator (?) in the front of the dash pot, seems to have a hissing sound when the engine is shut down. This hissing will cease if I disconnect power via the battery.

dogdenii

Is there a hands-on way to check the operation of the fuel pump?

That is, without pulling it completely?

MTL_4runner

You need to hook a pressure guage into the fuel rail.

Could also be the EGR as mentioned.
Just seems like it is running lean and that is why you hear an RPM jump.

dogdenii

It's definitely running lean (as per spark plugs) but that doesn't explain the drop of 2 cylinders when the engine warms up.

thanks for the ideas, I'll just keep going through them.

JDK

MTL_4runner

If you mean drop=miss then yes it does.
A lean cylinder can certainly missfire.

If you are electrically losing spark, that is another story.

dogdenii

I hooked up the timing light to be sure that I wasn't losing spark. I'm not.

At least I have some other options now.

I really appreciate the help!

JDK