Can Exhaust repair affect temperature?
06-28-2002, 08:49 PM
#1
Three Wheelin'
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Can Exhaust repair affect temperature?
I just got my car back today after my mechanic welded new Y pipes from the dual exhaust into the cat (which a muffler shop specifically wouldn't do, by the way) So after driving all around town doing some errands, stop and go traffic mostly, in about 94 degree heat with the AC on, the warning light came on for the temperature gauge. It read barely over halfway, but the red light and central warning light both came on. So I turned the air conditioner off and and headed back home (where I almost was to). After a minute or so, the light went out and the temp dropped. Now, I don't seriously think the exhaust repair did that, but I am peeved that it happened the same day I picked it up. Although, I filled the car up with gas and put in some fuel injector cleaner, just because I never have before, right before I took it in. Could that have had some effect? After reading the posts about innacurate temp guages, I wonder if mine is for the worse. I'm hoping it's just a fluke, so someone please calm my nerves.
06-28-2002, 11:08 PM
#2
Flint,
I could be wrong here... so bear with me... Did the Euro's come with duals to begin with ?
If so, from what I've read they had NO CAT's.
The Muffler shop might not have wanted to dump all that exhaust into a single CAT if it wasn't OEM designed for the exhaust off of both banks.
Were the duals Y'd in AND out or did you simply mean a Y off the headers into the Cat. then single pipe?
In either case, unless they get real close to the transmission/differential to the point it got heat soaked, or, near a cooling line I can't see where the pipes would cause an overheat. If the exhaust was severely restricted you should feel some heat in the car or smell something HOT!
As a test take her out on a night run and stop somewhere dark, take a look along the whole system, on both sides for a GLOW.
Just last week my thermostat went belly up after a stop for lunch. To check; after a run see if you have a hot and a cool hose (noticeable to touch)the hot hose will also be hard while the cool hose should be squeezeable.
Dennis Wilson thinks that the electric cooling fan did not come on because the sensor is on the cool side - sounds reasonable/logical -. We won't get into the arguement that the electric fan is for the A/C, only! As to the warning light, My gauge was centered and no warning light after Brett and his sHARk 'Rosie' waved me over to report a MASSIVE fluid loss from my right side.
I was still idling, hopped back into the car to pop the hood when the temp. gauge needle went ballistic and the overheat light came on, shut down!!!!!!!
Check your fluids as mine blew out the overflow tube and roared out of the cap. Due to the fluids boiling internally - engine fluids being sealed in the block by the thermostat frozen in the shut position - the fluid level did not drop in the reservoir tank for quite a while. I had no hose leaks and the gauge is working fine, now.
Might want to look at the bottom of your radiator/A/C cooler as they may be clogged by bugs, dirt, the neighbors cat...
As for me... new thermostat, gasket, big hose -hot, hard one was overstressed - and pressure cap.
Your's is the 3rd heat problem in two weeks it's common <img src="graemlins/crying.gif" border="0" alt="[crying]" />
<img src="graemlins/drink.gif" border="0" alt="[cherrsagai]" /> 
<img src="graemlins/drink.gif" border="0" alt="[cherrsagai]" /> <img src="graemlins/drink.gif" border="0" alt="[cherrsagai]" />
I could be wrong here... so bear with me... Did the Euro's come with duals to begin with ?
If so, from what I've read they had NO CAT's.
The Muffler shop might not have wanted to dump all that exhaust into a single CAT if it wasn't OEM designed for the exhaust off of both banks.
Were the duals Y'd in AND out or did you simply mean a Y off the headers into the Cat. then single pipe?
In either case, unless they get real close to the transmission/differential to the point it got heat soaked, or, near a cooling line I can't see where the pipes would cause an overheat. If the exhaust was severely restricted you should feel some heat in the car or smell something HOT!
As a test take her out on a night run and stop somewhere dark, take a look along the whole system, on both sides for a GLOW.
Just last week my thermostat went belly up after a stop for lunch. To check; after a run see if you have a hot and a cool hose (noticeable to touch)the hot hose will also be hard while the cool hose should be squeezeable.
Dennis Wilson thinks that the electric cooling fan did not come on because the sensor is on the cool side - sounds reasonable/logical -. We won't get into the arguement that the electric fan is for the A/C, only! As to the warning light, My gauge was centered and no warning light after Brett and his sHARk 'Rosie' waved me over to report a MASSIVE fluid loss from my right side.
I was still idling, hopped back into the car to pop the hood when the temp. gauge needle went ballistic and the overheat light came on, shut down!!!!!!!
Check your fluids as mine blew out the overflow tube and roared out of the cap. Due to the fluids boiling internally - engine fluids being sealed in the block by the thermostat frozen in the shut position - the fluid level did not drop in the reservoir tank for quite a while. I had no hose leaks and the gauge is working fine, now.
Might want to look at the bottom of your radiator/A/C cooler as they may be clogged by bugs, dirt, the neighbors cat...
As for me... new thermostat, gasket, big hose -hot, hard one was overstressed - and pressure cap.
Your's is the 3rd heat problem in two weeks it's common <img src="graemlins/crying.gif" border="0" alt="[crying]" />
<img src="graemlins/drink.gif" border="0" alt="[cherrsagai]" /> <img src="graemlins/drink.gif" border="0" alt="[cherrsagai]" /> <img src="graemlins/drink.gif" border="0" alt="[cherrsagai]" />
06-28-2002, 11:46 PM
#3
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Live from Miami-
I just wonder, Flint, how exactly did they weld the pipes on your car? Did they use a gas welder?
If they used an arc welder of some sort, then your gauge could be funkalated......
In Jr. high school in the 1980's, I actually had a chance to use an arc welder in shop class. I remember it was neat- I took a marble into the welding booth and melted it.
"Heh, heh, heh, uhh...lets break something!" Says Butthead.
ANYWAY, what you've described should not happen. If your engine is hot, your gauge should read so. And if your gauge reads normal, your warning light shouldn't shine- this all tells me that something is lying.
I hate when that happens; mechanics look at you funny then-
They look at me funny anyway. But you need to have one check your engine- specifically to determine just what temperature it is running at. Perhaps your gauge is lying to you- ugly thought! Most radiator shops can aim a temperature sensor at your car and tell you if it is really hot or if [in true airplane style] you've simply got a bad sensor or a fouled connector.
For what it is worth, my '85 S2 [high compression Europe-only version] runs with the needle in the absolute center in traffic in Central Florida in the Summer, with the AC on, and while sipping horrid US gasoline. I recently changed the coolant and thermostat. No change in temp after, no scale in the reservoir, and the coolant looked like it was new.
There's no replacement for good maintenance; that and your fingernails are delicious afterwards.....
Normy!
'85 S2 5 speed
I just wonder, Flint, how exactly did they weld the pipes on your car? Did they use a gas welder?
If they used an arc welder of some sort, then your gauge could be funkalated......
In Jr. high school in the 1980's, I actually had a chance to use an arc welder in shop class. I remember it was neat- I took a marble into the welding booth and melted it.
"Heh, heh, heh, uhh...lets break something!" Says Butthead.
ANYWAY, what you've described should not happen. If your engine is hot, your gauge should read so. And if your gauge reads normal, your warning light shouldn't shine- this all tells me that something is lying.
I hate when that happens; mechanics look at you funny then-
They look at me funny anyway. But you need to have one check your engine- specifically to determine just what temperature it is running at. Perhaps your gauge is lying to you- ugly thought! Most radiator shops can aim a temperature sensor at your car and tell you if it is really hot or if [in true airplane style] you've simply got a bad sensor or a fouled connector.
For what it is worth, my '85 S2 [high compression Europe-only version] runs with the needle in the absolute center in traffic in Central Florida in the Summer, with the AC on, and while sipping horrid US gasoline. I recently changed the coolant and thermostat. No change in temp after, no scale in the reservoir, and the coolant looked like it was new.
There's no replacement for good maintenance; that and your fingernails are delicious afterwards.....
Normy!
'85 S2 5 speed
06-29-2002, 08:44 PM
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Three Wheelin'
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Well, as I said, I don't really think it has to do with the exhaust, it's probably just coincidence that it happened the same day. As said in another, similar thread, it's probably just a combination of factors that doesn't happen often (hopefully, but I'll be keeping an eye out). Checking my radiator fluid would be a good way to start, since I can't remember the last time I did, it now occurs to me.
To answer your questions, my car was obviously federalized by taking out the original twin-pipe muffler and replacing it with an earlier-year single-pipe. The Y-fitting is at the back of the cat, connecting the twin pipes that run out the back. Eventually, I'll fix it to original standards, but I didn't want that expense now. On the upside, the car sounds much subtler and runs a hell of a lot smoother.
To answer your questions, my car was obviously federalized by taking out the original twin-pipe muffler and replacing it with an earlier-year single-pipe. The Y-fitting is at the back of the cat, connecting the twin pipes that run out the back. Eventually, I'll fix it to original standards, but I didn't want that expense now. On the upside, the car sounds much subtler and runs a hell of a lot smoother.
06-29-2002, 09:44 PM
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Flint,
Since you don't have an email, I will post this. My '83 Euro had a dual system. When a cat was added to federalize it, it was a dual in and dual out cat. I think many of the grey market cars were handled differently and the equipment varied. If you are trying to keep your car as close to stock and need a dual in and dual out cat. I have one I will make you a really good deal on.
Let me know.
cheers <img src="graemlins/beerchug.gif" border="0" alt="[cheers]" />
JF
Since you don't have an email, I will post this. My '83 Euro had a dual system. When a cat was added to federalize it, it was a dual in and dual out cat. I think many of the grey market cars were handled differently and the equipment varied. If you are trying to keep your car as close to stock and need a dual in and dual out cat. I have one I will make you a really good deal on.
Let me know.
cheers <img src="graemlins/beerchug.gif" border="0" alt="[cheers]" />
JF
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07-01-2002, 04:41 PM
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Burning Brakes
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My '85 Euro got the same treatment - single outlet cat and single exhaust. What I should call it is a "singe" outlet cat. That car had so much heat pouring out from underneath it after a decent drive that you would be "encouraged" to step the heck away from the car after you got out lest your leg hair be singed off. Needless to say, the single outlet cat is juuuust a bit restrictive. However, the car ran cool as a cucumber with this exhaust on it. So it's unlikely that your car would run hot because of something with the exhaust.
Twin pipe exhaust rules.
Bryan
Twin pipe exhaust rules.
Bryan
07-03-2002, 03:31 AM
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Three Wheelin'
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[quote]Originally posted by Joe F:
<strong>Flint,
Since you don't have an email, I will post this.
JF</strong><hr></blockquote>
I don't? I'll fix that! dum de dum. There.
Anyway, what's your cat look like? Does it look like...<a href="http://www.mailordercentral.com/928intl/prodinfo.asp?number=928%20113%20212%2001&variation=&aitem=40&mitem=51" target="_blank">this?</a>
But, now that what I've got has been fixed with good metal, I'm surprised at how subtle, yet muscular the sound is. Not to mention smooth, that whole ****ty weld-job whoever it was did back in '84 must have been causing all that huge vibration I've been feeling. I'm simply amazed. I may even be content to wait and get used to it as it is before restoring the exhaust and unleashing the power of that European-market engine (with aftermarket racing camshafts on top of it!)
Normy, my car has an import plaque that says it was imported by "European Auto Sales Inc." Pretty original, huh? I think it was a local high-end dealership that went under years ago. In fact, many years ago I went there with my dad for some reason, probably after one of his books hit, and saw a new 928. I can still remember the salesman turning on the lights and watching them pop up in the relative darkness of the showroom--Obviously it made quite an impression on a little kid.
<strong>Flint,
Since you don't have an email, I will post this.
JF</strong><hr></blockquote>
I don't? I'll fix that! dum de dum. There.
Anyway, what's your cat look like? Does it look like...<a href="http://www.mailordercentral.com/928intl/prodinfo.asp?number=928%20113%20212%2001&variation=&aitem=40&mitem=51" target="_blank">this?</a>
But, now that what I've got has been fixed with good metal, I'm surprised at how subtle, yet muscular the sound is. Not to mention smooth, that whole ****ty weld-job whoever it was did back in '84 must have been causing all that huge vibration I've been feeling. I'm simply amazed. I may even be content to wait and get used to it as it is before restoring the exhaust and unleashing the power of that European-market engine (with aftermarket racing camshafts on top of it!)
Normy, my car has an import plaque that says it was imported by "European Auto Sales Inc." Pretty original, huh? I think it was a local high-end dealership that went under years ago. In fact, many years ago I went there with my dad for some reason, probably after one of his books hit, and saw a new 928. I can still remember the salesman turning on the lights and watching them pop up in the relative darkness of the showroom--Obviously it made quite an impression on a little kid.