Gurney

First, what a great site, one of the most informative ones around. I have a 1990 4Runner, Auto, 3.0 that is using 1L of coolant every 2-3 days. I took it to Toyota, thought it was the HG, they checked it all out and said that the HG is good and that there must be a leak under the intake manifold. Has anyone had a problem like this and how to fix, $1000 estimate from Toyota. I did a search but could not find much. Thanks for the help.

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socal91runner

do a search for "gas smell" and you'll find the procedure on how to get at the fuel injectors to replace the o-rings. There's a post somewhere that will give you the steps necessary to remove the intake manifold.

-socal

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socal91runner

4Runner-less

Sold 1998 2wd 4Runner SR5

Sold 1991 2wd 4Runner SR5

hosh

http://personal.utulsa.edu/~nathan-buchanan/93fsm/

online factory service manual. Pulling the intake is pretty easy

__________________
95' 4runner -- sold
82' 4x4 -- organ donor for the 93 - but for now summertime playtoy
93' 4x4 extended cab --- Mods; buffalo dents- Future mods; SAS, 33"s, dual cases, motor rebuild
85' MR2 -- It Liiiiivvvveeeeessss!!!! and is almost on the road
87' EX500 -- basket case frankenbike

"life, liberty and the pursuit of all those who threaten us"

hosh

oh yah. welcome to YT

__________________
95' 4runner -- sold
82' 4x4 -- organ donor for the 93 - but for now summertime playtoy
93' 4x4 extended cab --- Mods; buffalo dents- Future mods; SAS, 33"s, dual cases, motor rebuild
85' MR2 -- It Liiiiivvvveeeeessss!!!! and is almost on the road
87' EX500 -- basket case frankenbike

"life, liberty and the pursuit of all those who threaten us"

Gurney

Thanks for the quick reply.

Once I have the intake manifold off is there an easy way to find the leak? Does it even make sense that there is a leak under the intake?

Thanks

GSGALLANT

If there is a leak under the intake manifold putting out 1L of coolant every 2-3 days, it will be visible somewhere. Ever see any puddles under the truck? Ever see any steam coming from your engine compartment? If not, then it's not sounding like an external leak. Did they pressure test your cooling system?

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2002 4Runner, Auto-A340F, 3.4L, 4.30 Gears
TJM T15 Front Bumper & Warn M8000, 4xInnovation sliders, Sonoran Steel 1.2 Lift, Toytec LCA Skids, Tundra Brake Upgrade (231mm), Extended rear diff breather, Deckplate Mod, Andymod, Dual batt setup with Optima blue top aux battery, Hardwired 1000W inverter, Aux fuse box, Full time power to 12V plugs, Yaesu FT7800R Radio, "4-air" system for airing up/down tires.

2004 Camry LE - stock (and will stay that way)

1993 4Runner has been sold

Gurney

Toyota did not do a pressure test, they took out the spark plugs and used a scope to look in the cylinders. They said that if there is a HG leak there would be a residue on the cylinder walls.

I still think that the HG is going.

kevinkal

I'm in the middle of chaning the head gaskets on my 93 PU with a 3VZ. The obvious indication that the gasket was blown was the white smoke of the exhaust and the odor of the exhaust. The white exahaust smoke was most prominant after a cold start. Although as your dealer pointed out, this could be a leak into the intake. However, It seems far more likely to be the head gasket imo.

__________________
Kevin

'93 Pickup, 4x4 ExCab , 3.0L w/211K
'03 Sequoia, 4x4 Limited, 4.7L w/58K
'05 Prius, w/60K

4Run_95

I had/have the same problem. Coolant was leaking down from somewhere. No one found the leak so we added "coolant metal" .works for now but i do not know how long it will last.
Might it be the HG ? The engieen has never ran badly or anything.

1994runner

if im not mistaken, there is a tube that runs from the back of the waterpump to the rear of the engine under the manifold. If there is it could be the seals or the tube itself rusted through. Sorry for being vague, its been a long time since I had a manifold off of a 3.0