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Old 03-17-2006, 01:24 PM   #1
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Collapsing Stock Intercooler Hoses

I have recently have problems with my 98 GS-T, especially under boost and heavy load (WV hills on the interstate). It threw a CEL P0170 which is fuel trim malfunction (bank 1) running RICH. I took it to the Mitsu dealer after weeks of no luck to get it checked out. MAS, 02, and coilpack checked out ok as well as compression. The mechanic as well as the Mitsu techline they called said that they think the stock intercooler hoses are collapsing. My question is:

-Is this common?
-Has any of you had this happen?
-If so, what were your symptoms?

1998 GS-T with hard intake pipe and high flow filter. (eBay shit)
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Old 03-17-2006, 01:37 PM   #2
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Re: Collapsing Stock Intercooler Hoses

how can rubber pipes collapse under positive pressure?
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Old 03-17-2006, 02:18 PM   #3
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Re: Collapsing Stock Intercooler Hoses

Quote:
Originally Posted by K_Mans_TSI
how can rubber pipes collapse under positive pressure?

Exactly what I was thinking....
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Old 03-17-2006, 02:42 PM   #4
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Re: Collapsing Stock Intercooler Hoses

Maybe just a plain ol boost leak. Like kurt said. There is positive pressure in those rubber hoses. I dont see how one would collapse. Are you still having this problem?
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Old 03-17-2006, 03:06 PM   #5
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Re: Collapsing Stock Intercooler Hoses

you need to pressure test the intake side of your setup.

check your couplers etc etc.
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Old 03-17-2006, 03:12 PM   #6
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Re: Collapsing Stock Intercooler Hoses

Ya, sure sounds like a boost leak, altho I don't see how that would throw a CEL...?

If those dealers try to get you to fork over a couple hundred bucks for new rubber pipes, RUN!! I have never heard of such a problem, and we all know how reliable SATAN is anyway

Definitely do the air leak test...You migth find out it's something simple, like 1 of the fuel injectors leaking or not closing
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Old 03-17-2006, 03:13 PM   #7
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Re: Collapsing Stock Intercooler Hoses

The techs said that these 4 hoses need replaced because they are collapsing or about to collapse.

These are the 4 parts from mitsubishiparts.com:

INTERCOOLER HOSE, Eclipse, Upper 95-99
INTERCOOLER HOSE, Eclipse, Lower 98-99
INTERCOOLER HOSE, Eclipse, Air Pipe Inlet, 96-99
INTERCOOLER HOSE, Eclipse, Air Pipe Outlet 95-99

which is:

MR258670 - $88.53
MB906453 - $95.36
MR126099 - $44.89
MB906455 - $11.46
Labor - $65 for one hour installation

Are they tryin to screw me or what?? The car is still at the garage.
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Old 03-17-2006, 03:17 PM   #8
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Re: Collapsing Stock Intercooler Hoses

For $300, you could upgrade all of your intercooler pipes to hard 2.5" piping and throw on a 1g bov and mbc and still be happy...

I don't see how replacing those parts would solve anything
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Old 03-17-2006, 03:20 PM   #9
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Re: Collapsing Stock Intercooler Hoses

MR258670 - $88.53
MB906453 - $95.36
MR126099 - $44.89
MB906455 - $11.46

wow, 88 for the upper is alot less than I expected.

you already have hard pipes correct?
do you have a upper and lower, or just the upper?



you need to pressure test your setup before you do anything that costs more $, and while your at it.
Get a dejon intake pipe. You'll need to take off the old accordian intake pipe for the test, so you might as well put a nice new one on
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Old 03-17-2006, 03:23 PM   #10
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Re: Collapsing Stock Intercooler Hoses

I have a hard intake pipe (turbo to MAS) with new cone filter off ebay. All hoses are stock. The car is at the garage so I can't check it out myself. She's in prison. How do I do an air leak test??

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Old 03-17-2006, 03:46 PM   #11
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Re: Collapsing Stock Intercooler Hoses

Just tell them not to fix it, and get your car back and check it out.
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Old 03-17-2006, 04:12 PM   #12
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Re: Collapsing Stock Intercooler Hoses

Quote:
Originally Posted by D$MTUN3R
How do I do an air leak test??

you need to build it

there is a vfaq on it.
it is actually pretty fun.


definitily replace the stock rubber shit pipes with some hard ones whenever you get the $.
of if the pressure test shows some leaks. i'd bet a stocker like yours will have a few leaks.
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Old 03-17-2006, 04:43 PM   #13
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Re: Collapsing Stock Intercooler Hoses

I agree. Get the car from the mechanic and build yourself a tester. Telling you that the hoses are on the verge of collapse is a sure sign that they have no clue what they're doing. Save yourself time and money and diagnose/repair it yourself.
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Old 03-17-2006, 05:45 PM   #14
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Re: Collapsing Stock Intercooler Hoses

All of this seems to have risen from that intake I just installed. I can't tell you how many times I have check all the couplers and hoses (by the way, what are those hoses for?). Everything is secure. Everything drives well in that car except under high boost. They said they checked for boost leaks, but fuck, I don't even know if they know what that is now. The plugs were so fouled (brand new autolites, yeah i know) that the bitch would barely idle when I dropped it off and they've driven 10 miles in test drives without even replacing plugs. How could you see through the fucked up plugs to get to the real problem? The shit of it is, my house is on the other side of town and the plugs are so fouled that I don't think it will make it. I'm gonna go down Monday before they supposedly put those hoses in and see what they're rationale is. Even if this is the cause of a car crippling boost leak, I think they would have seen something. There is probably a small hole in one and they're trying to get my to cop the whole set. I definitely goin down there before they try anything. Where would I get a set of hard pipes to replace the ones that are "collapsing". Although it is positive pressure, isn't the intercooler plumbing a large vacuum? I mean the possibility of collapse is there but I'm not boosting 30psi or some shit like that. What things could possibly be broken after an intake install from say, an increase in air? What could throw a P0170?
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Old 03-17-2006, 08:02 PM   #15
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Re: Collapsing Stock Intercooler Hoses

Just get a tester from one of the many vendors and check it out yourself, very easy to do and save yourself $$.
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