coolant leak???
11-01-02, 02:21 AM
#1
this is not a typical coolant leak???
ok i'm now stumped...i'just replaced my frickin heater hose ($27.00) because of small pin size leak...now there is fluid coming from (looking from front of car to back) lthe eft side rear... it sprays fluid onto the exaust manifold just behide the o2 sensor...it looks like it is coming from somewhere under the intake manifold... it only leaks though when the rpms are around 4k and above...
are there any other hose besides the 2 radiator and 2 heater hose that radiator fluid flows through that are under the intake manifold arond the left rear??? i don't want to say it is a water seal leak around rear housing because ...
1. shoots downwards
2. is not consistent pressure (meaning it flows like a someone pouring a two liter bottle--blurp blup
)
3. the fluid pressure doesn't seem high (more of a pouring out that why i'm thinking there is some sort of hose elsewhere)
some help or hypothesis would be helpful...try to come up with something...
i don't want to have to take off my intake manifold if i don't have to!
I have an 87 auto (na of course)
are there any other hose besides the 2 radiator and 2 heater hose that radiator fluid flows through that are under the intake manifold arond the left rear??? i don't want to say it is a water seal leak around rear housing because ...
1. shoots downwards
2. is not consistent pressure (meaning it flows like a someone pouring a two liter bottle--blurp blup
) 3. the fluid pressure doesn't seem high (more of a pouring out that why i'm thinking there is some sort of hose elsewhere)
some help or hypothesis would be helpful...try to come up with something...
i don't want to have to take off my intake manifold if i don't have to!
I have an 87 auto (na of course)
Last edited by nashman69g; 11-01-02 at 02:28 AM.
11-01-02, 11:52 AM
#2
Sometimes I miss my RX-7s
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I want to say there is an L shaped hose that runs under the intake manifold. You may be able to get at it if you have skinny arms and basically cut the hose off. The hard part is getting it back on and clamping it somehow. I know I did it once, and it wasn't easy. I want to say I had to put something on the hose so it would slide on, and then I had to use an odd assortment of extensions to get a clamp tightened up on there.
11-01-02, 04:36 PM
#5
woahoo i found the leak... there is a hose that runs under the intake manifold...looks like i now have to take it off
... the hose comes from this thing that comes from the BAC hose that runto the left side of intake manifold...it then goes down below the intake manifold...
any gurus now what this is for??? cooling the intake???
... the hose comes from this thing that comes from the BAC hose that runto the left side of intake manifold...it then goes down below the intake manifold...any gurus now what this is for??? cooling the intake???
11-01-02, 05:22 PM
#6
84SE-EGI helpy-helperton
Heating the intake, actually.
There is a thermowax pellet in your throttle body that is heated by the hose coming from the backside of the water pump. When the waterpump water heats up (from engine running) on cold days, this hot water is pumped to the side of the throttle body where it melts a thermowax pellet (basically a lump of wax that melts at a specific temperature). Once melted, the wax allows the throttle to drop down to regular idle speeds. This effectively provides for a 'choke' on a fuel-injected engine that uses a throttle body instead of a carb.
On a carb engine, the choke closes off some of the air flow by partially closing the butterfly valves, this causes the engine to get a rich mixture until the engine heats up, then the throttle plates open/close as normal. The extra rich mixture helps to keep the car running in cold climates when starting from cold.
The EFI engines use the thermowax pellet to provide this delay 'choke' so that the EFI engine has a rich mixture during cold starts, too. When you shut the engine off, the engine cools, and eventually, the wax hardens again, setting itself up for your next cold start, which repeats the sequence. HTH,
There is a thermowax pellet in your throttle body that is heated by the hose coming from the backside of the water pump. When the waterpump water heats up (from engine running) on cold days, this hot water is pumped to the side of the throttle body where it melts a thermowax pellet (basically a lump of wax that melts at a specific temperature). Once melted, the wax allows the throttle to drop down to regular idle speeds. This effectively provides for a 'choke' on a fuel-injected engine that uses a throttle body instead of a carb.
On a carb engine, the choke closes off some of the air flow by partially closing the butterfly valves, this causes the engine to get a rich mixture until the engine heats up, then the throttle plates open/close as normal. The extra rich mixture helps to keep the car running in cold climates when starting from cold.
The EFI engines use the thermowax pellet to provide this delay 'choke' so that the EFI engine has a rich mixture during cold starts, too. When you shut the engine off, the engine cools, and eventually, the wax hardens again, setting itself up for your next cold start, which repeats the sequence. HTH,
11-01-02, 05:25 PM
#7
84SE-EGI helpy-helperton
Sorry - I didn't answer your question;
There is a hose leading from the back of the water pump, under the upper intake manifold to the rear of the throttle body. This supplies hot water to the thermowax pellet. From there, another hose goes from the back of the throttle body to the top of the engine, right next to, and in front of, the O2 sensor. This is likely where your leak is coming from, the return line to the engine block.
There is a hose leading from the back of the water pump, under the upper intake manifold to the rear of the throttle body. This supplies hot water to the thermowax pellet. From there, another hose goes from the back of the throttle body to the top of the engine, right next to, and in front of, the O2 sensor. This is likely where your leak is coming from, the return line to the engine block.
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