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Old 07-18-2010, 02:02 PM   #1
iluvdrt
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98 Lego GT wagon w/ 5 spd conversion 2.5 EJ2D


Well I am not sure (pretty sure actually, just hoping for the best) that my HG's are blown again. I did them about 70K ago so I guess they are due again LOL.

Anyways tell me what you think.

Symptoms:

- slight carbon in overflow tank
-pushing coolant into overflow, BUT not overflowing it (IE no coolant loss), but it is VERY full (by the cap).
-a few bubbles every now and then
-Carbon chunks on rad cap
-idle operating temp 205-210
-cruise temp 185-191
-rough idle
- O2 sensor code P0130
-P1507 IAC valve code
-Car stays in open loop most of the time.


Now I know coolant systems push coolant when they heat up and it has been VERY hot here (heat index well over 100). I havent been losing coolant, but I do smell it every now and then. The overflow bottle is very full but hasn't overflowed AFAIK.

Some things I noticed. System doesn't always pressurize after driving. fans do work.

So for now I am going to change both coolant temp sensors, t-stat, coolant, rad cap, and pressure test the system for leaks. i know cars run hot if they can't pressurize and the cap can let excessive coolant through into the bottle. The bubbles could be from the new air pockets forming in the system from it not being sealed. Anyways tell me what you think. Thanks.
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Old 07-18-2010, 03:08 PM   #2
flightwatch
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Doesn't sound like hg failure to me. Oil in the coolant or vice versa? The carbon deposits are probably dislodged deposits that were carried through the passages. Definitely time for a coolant flush. I can't see where the O2 sensor cel would have anything to do with the coolant issue. It also might be happening because of the excess heat. It has been over 115 degrees here for the past 4 days, and you wouldn't believe the amount of cars (especially older cars) that I have seen pulled over because they are overheating.
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Old 07-18-2010, 03:17 PM   #3
iluvdrt
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Doesn't sound like hg failure to me. Oil in the coolant or vice versa? The carbon deposits are probably dislodged deposits that were carried through the passages. Definitely time for a coolant flush. I can't see where the O2 sensor cel would have anything to do with the coolant issue. It also might be happening because of the excess heat. It has been over 115 degrees here for the past 4 days, and you wouldn't believe the amount of cars (especially older cars) that I have seen pulled over because they are overheating.

Right on. Well P1 Subaru's blow their HG's externally and push coolant. It never burns it or gets into the oil, it just pushes it. The exhaust blows by the HG during the exhaust stroke and enters the coolant passages...which equals coolant overflow overflowing. It isn't bad, but I am on agreence (SP?) with you. I think the carbon could be left over from last time and it just needs a flush/coolant tune up. Hope so. Thanks for your input!!
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Old 07-18-2010, 03:58 PM   #4
Patrick Olsen
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I think it's time for HGs again.

I don't really see much point in changing the coolant temperature sensor and sending unit. It won't hurt to replace them, obviously, but getting to them is somewhat a PITA and you don't have any reason to think they're bad, do you?

Pat Olsen
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Old 07-18-2010, 06:05 PM   #5
iluvdrt
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Originally Posted by Patrick Olsen View Post
I think it's time for HGs again.

I don't really see much point in changing the coolant temperature sensor and sending unit. It won't hurt to replace them, obviously, but getting to them is somewhat a PITA and you don't have any reason to think they're bad, do you?

Pat Olsen
I had to clean the IAC valve to help with the P1507 anyways so...

But yes, my scanner reads engine temp at over 200 but my gauge shows below 1/2 way. I was thinking the engine was supposed to be around 180-190 at operating temp. I have a 170 degree t-stat in there now.
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Old 07-18-2010, 09:35 PM   #6
Patrick Olsen
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Based on my real (DEFI) gauge vs. my factory dummy gauge, the stock gauge will sit at its "normal" position (just below halfway) from about 70C until about 100-105C, somewhere in there. (The DEFI sending unit is in the coolant crossover pipe, maybe an inch or so from the factory sending unit, so it's seeing the same coolant.)
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Old 07-18-2010, 09:49 PM   #7
iluvdrt
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Originally Posted by Patrick Olsen View Post
Based on my real (DEFI) gauge vs. my factory dummy gauge, the stock gauge will sit at its "normal" position (just below halfway) from about 70C until about 100-105C, somewhere in there. (The DEFI sending unit is in the coolant crossover pipe, maybe an inch or so from the factory sending unit, so it's seeing the same coolant.)
What should the idling temp range be then? My scanner shows anywhere from 190-210. Fans come on at 200. If I run the AC it stays at about 185-195, because both the fans are on. Thanks for the help Pat.
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Old 07-18-2010, 10:36 PM   #8
Patrick Olsen
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That seems about right. The FSM says the fans should trigger at 95C (203F).
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Old 07-18-2010, 10:50 PM   #9
iluvdrt
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Cool. We we will see.

Idle seems to be a lot better. Only tomorrow will tell once I can really drive her around.
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