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Old 08-03-2014, 01:02 PM   #16
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Exhaust leak?


Looks like steam. Does it feel "wet" on the hand?

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Old 08-03-2014, 01:41 PM   #17
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Exhaust leak?


+1

Any updates on this? My interest is piqued.
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Old 08-03-2014, 01:57 PM   #18
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Exhaust leak?


I got the van up on ramps, crawled under it while it was idling and aside from the exxon valdez oil leak from the rear valve cover the exhaust system seemed ok. When i turned off the engine off i could hear coolant sizzling on the exhaust manifold. That why i didn't have puddling. It was dripping on a hot manifold.

I will order a mtyvac coolant system tester from amazon so i can find the leak with engine cold.

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Old 08-03-2014, 09:54 PM   #19
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Exhaust leak?


How are the heater core connections that go into the firewall?

While you're in there, you should rotate the engine 45 degrees and convert it to RWD, so it's easier to work on.
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Old 08-03-2014, 10:38 PM   #20
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Exhaust leak?


I figure it must be heater hose related, but all the connections seem tight. I put a brand new upper hose on but maybe its the lower one. Maye a hole somewhere. I can't see anything and i don't want to feel arond there with engine hot. Coolant tester should reveal the leak pretty quickly since its obviously pretty large.

Might use as an excuse to buy an $80 inspection camera from barbor frieght.
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Old 08-04-2014, 06:39 AM   #21
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Exhaust leak?


Advance Auto Parts/Autozone rent the cooling system pressure tester you need for free and usually have it in stock. At $149 or so for a quality one, I usually suggest this is a rented tool. Pressurize the system to the psi rated on the cap, then find the leak.
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Old 08-04-2014, 12:47 PM   #22
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Exhaust leak?


Since this is only $45 and has excellent reviews I'm going to add it to my auto repair equipment.

http://www.amazon.com/gp/aw/d/B003V9...ref=mp_s_a_1_1

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Old 08-06-2014, 11:23 AM   #23
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Exhaust leak?


I think I may have figured out what is leaking. Apparently, there are a number of small 5/16 inch and one 5/8 inch coolant lines that connect to the IAC valve and the throttle body. They aid in heating these components to improve emissions (IAC valve) or prevent icing (throttle body). I found a diagram of the hose routing in the shop manual. They come off the main (metal) heater line before it transitions to a rubber heater hose.

All of them are on the rear of the upper intake manifold or under the throttle body so they may be difficult to get to. Not to mention they are all held on with tiny little spring clamps that I can feel but not actually see. As the leak begins when the van starts, I assume one of these line connections is leaking. I may buy some spring clamp locking pliers to help me get them off. Maybe this one, if it fits small clamps.

http://www.autozone.com/autozone/acc...er=607069_0_0_

I will check it out later this week and post a video if I find the culprit.
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Old 08-11-2014, 03:45 PM   #24
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Exhaust leak?


Update: I found my leak. Last Friday I bought a radiator pressure tester from Harbor Freight ($72 with 20% off coupon). This is a pretty sturdy kit. All the adapters are heavy plastic and the ‘push down and turn’ adapters are metal inside the plastic cap. The pump is metal and the adapters and pump have quick connect fittings. Everything comes in a sturdy plastic case with sliding plastic latches that look like they will hold up well. My adapter required quite a bit of effort to get on the radiator, but it did fit and it was air tight.

I filled up the radiator, put on the adapter and with less than four pumps I heard the leak. It was a 3/8 inch hose next to the IAC valve assembly and I could feel the pinhole leak spewing from the middle of the hose.

This leak, however, is on a hose that is inaccessible. I can put my hand on it, but I can’t get a tool on the spring clamps. I might have to end up taking the IAC valve off to get to the clamps, but even then I don’t know if I will have access. I would, as you can imagine, prefer to not have to remove the upper intake manifold to replace a four inch long, 40 cent hose. I am considering buying a pair of flexible hose clamp pliers ($35) that are supposed to allow access to inaccessible spring clamps. Does anyone have experience with these? Do they work? Anybody have any advice on getting these blankity blank little clamps off when you can’t get to them? Thanks.
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Old 08-11-2014, 04:18 PM   #25
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Exhaust leak?


Welcome to automotive engineering in the 21 century.

Make it expensive.
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Old 08-11-2014, 05:47 PM   #26
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Exhaust leak?


Those pliers do work in some places. But sometimes you have no choice but take a lot apart. I've billed out many $1000 repairs with a couple dollars in parts.
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Old 08-11-2014, 06:09 PM   #27
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Exhaust leak?


Any chance you could loosen a motor mount (or 2) and use a jack to tilt the motor forward for more room?
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Old 08-11-2014, 06:30 PM   #28
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Exhaust leak?


Quote:
Originally Posted by cjm94 View Post
Those pliers do work in some places. But sometimes you have no choice but take a lot apart. I've billed out many $1000 repairs with a couple dollars in parts.
I figure pulling the upper intake manifold alone is $300 in labor. I'll diy it first. I gave $1800 for it. It's my learning platform now.
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Old 08-11-2014, 06:39 PM   #29
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Exhaust leak?


The manifolds aren't to bad to do. If you remove the wiper cowling first there is a ton of room. And that comes off pretty easy.
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Old 08-11-2014, 08:05 PM   #30
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Exhaust leak?


Quote:
Originally Posted by cjm94
The manifolds aren't to bad to do. If you remove the wiper cowling first there is a ton of room. And that comes off pretty easy.
Is the manifold on the student at two-piece or one-piece design? I'm guessing 2.

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