MADDNESS

86 4runner glowing exhauxst need help everything checks out fine i am starting to think it may be electrical or something to do with main computer only runs lean when hot any suggestions replaced fuel pump,complete exhaust,fuel filter,pressure regulator,o2sensor,afm,injectors,coolant temp sensor

dcg9381

1) Check timing.
2) Verify that 02 is dithering (swinging)

ovrrdrive

Mine has always glowed at night a little too... I suggest not looking under the hood after dark.

Brenjen

Might be using too high of an octane gas; if I'm not mistaken it's designed for 87 octane, higher than that & un-burnt fuel can accumulate in the exhaust.

neilan

i have been workig non the same problem for a motnh it is a rich condition not a lean one. Unburnt fuel is burnig nin the exhuast because it isnt completely burning in the cylinder. I have done verythin to mine to try to get it to stop. I have rebuilt injectors, new fuel filter, nbew afm, tps, o2 and my tyimign is good. I have no codes either. I just gto saick of screwign with it and took it in. Should be doen today ill let you know what it was.

dcg9381

How do you know it's a rich condition? I'd be suprised if that was the case.
If you think that's the case, your narrowband should be pretty much pegged rich.

Burning in the exhaust is typically caused by timing that is too conservative. Basically the cylinder gets ignited late and it's still burning when the exhaust valve opens. You need heat + pressure to ignite fuel. The exahust system doesn't have a lot of pressure.

I'm not sure that higher octane would lead to EGTs this excessive....

You can get a decent EGT gauge for around $100 from gaugepods.com - drill and tap simple install...

neilan

not necesarly i am pretty sure my problem is not even ecu related. Even though i replaced my injectors abotu 2 months ago i suspect one of them is sticking open and leaking. I know fro a fact thta the condition is only happeing on one cylinder because from startup i monitered the temperature at each port on the manifold with a laser temp gun and watched one skyrockit while the others rose at the same rate. My timing is perfect when this problem is occuring.

ovrrdrive

I can't speak for your situation, but most of the time a hot cylinder is a lean cylinder. Hotter EGT's are usually due to an engine being too lean as well.

If you have one cylinder that's running hot I would think it either has an intake valve that's not opening far enough or a bad fuel injector not letting enough fuel in...

But like I said, that's just my blind guess...

MADDNESS

Be sure to let me know if they fix your problem. I have taken mine to a couple different mech they cant seem to figure it out. I called toyota dealer there shop dont even want to look at it i am trying to find a good mech in southern cali or a wrecked runner to just replace entire efi system That is what i havent already replaced

dcg9381

22RE efi parts are all over the place.. just list what you need in the wanted section. Most of it can be replaced yourself with just a few tools.

Brenjen

It has to be unburnt fuel in the cat/exhaust that is being ignited. Too high an octane fuel & then an ignition source. Someone mentioned before the cylinder firing before the exhaust valve is closed; that is the most likely ignition source. That's what I would check, timing, valves & be sure I ran 87 octane.