Hey guys, I'm new to this board, but not new to the car forum world.


I have a friend of mine that's got a 86 4runner with a 22re in it. And he's asked me for help.

The truck will, on occasion, sputter and die. And you have to hold the throttle to get the truck to crank again. The truck then has a bad multi cylinder misfire that makes the truck virtually undriveable. And for some random reason, it will clear up itself and the truck will drive fine. It has apparently been getting worse now.

I have it in my garage now, and i can barely get it out. When it acts up, it's dumping raw fuel out of the exhaust and will foul the plugs.

Thanks to you guys on here, i pulled the codes. Have codes 4,6 and 11. Recently replaced parts(before i got it) are:

-MAF
-ECU
-o2 sensor
-Plugs & wires
-distributor

Any ideas would be greatly greatly appreciated and thanks in advance!

 

If it is dumping that much gas .

Have you checked to see if the cold start injector is stuck open ??

Or if it has a bad temp sensor telling it to stay open


after that I would check to see if the injectors fire as the should .

about the only way your going to get over fueled that bad.

your talking way beyond running rich correct

 

Thanks for the advice. After what i've read i thought it could be the cold start injector sticking open. Is there a way to test that?

And yes, we're talking about not wanting to light a match kind of rich. I wouldn't have any ignition source around the exhaust pipe right now.

 

Have you put new plugs in it? I had a cracked head cause a coolant leak which fouled plugs. The plug wouldn't fire so it dumped all the fuel from cylinder 2 into the exhaust. New plugs would have solved the misfire temporarily but it would have come back.

I had an issue with the cheap reman motor the PO put in my 87 4Runner. They used a cheap head gasket which blew between cylinders 1,2 and 3,4. This led to a cracked head. This all led to coolant being consumed and fouling plugs. It fouled 2 sets of plugs over the course of 3 months or so. When the crappy timing chain tensioner failed I tore the whole thing down, OEM timing set with metal backed guides, OEM head gasket, and a used OEM head.

Here's a video I took before I figured it all out.

 

I need to pull the plugs. Not losing any coolant or anything like that. it has about 2000X more black smoke coming out of the exhaust. And it will not idle or rev hardly at all.

It also only has 110k on it. I don tthink im looking at a head gasket failure, because it will clear up and run fine for days at a time.

 

Sounds like a stuck-open injector (which occasionally clears up).

While the CSI doesn't put out a whole lot, it's a lot easier to test. Just pull it out and pressurize the fuel rail with FP connected to B+ in the diagnostic connector (I'm not that sharp on '86s, but I know there is an FP connector somewhere. http://www.4crawler.com/4x4/CheapTri...CheckConnector) If fuel is coming out (no STA start signal), the injector is bad.

You could have a bad plug or plug wire that intermittently fails to fire. Also easy to test; put your timing light inductive pickup on each plug wire to see if you get regular flashing.

Code 4 says you've lost the THW (water temp) signal. That's certainly not going to help.

Good luck!