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Old 02-06-2006, 07:00 PM   #1
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Threw another code

I got a check engine light again for the 2nd time. I wanted to make sure it wasn't the same code I had been throwing beforeand it turns out it wasn't. The code before got cleared when I disconnected the neg battery cable and just never came back on. This one today was for p1025 or 0125 or something like that. Anyway it said engine temp too cold, closed loop something or another. I know some of you warned me about the 160 thermostat going into closed loop, but why is the code being thrown 5-700 miles after install? Also what is the lowest temp the SVTFs computer will let you run , until closed loop kicks in? And if I disconnect the neg battery cable will it clear this code permanently till I throw another one like it did last time?

I wanna keep the 160 in there because Houston's hot season is just around the corner and it will be running plenty warm. So all you Northerners shut up about a 160 t-stat.


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Old 02-06-2006, 07:06 PM   #2
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<subliminal> get a tune </subliminal>
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Old 02-06-2006, 09:03 PM   #3
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You have to decide whether you want us to shut up or tell you what's wrong...

You said the t-stat would start opening at 160 but that coolant temps would get up to maybe 180 tops. Closed-loop starts at around 175. So, you're on the ragged edge. Depending on ambient temps, driving style, road conditions, etc. you're either going to go high enough to keep the code from happening or you won't - and then you'll get a code, like today. That is why it took that long to throw the code. Thermostat probably loosened up and is opening faster now, too.

As for the what the temp limit is to go into closed-loop mode, I think you found it. You can probably use the trip odometer code reader to determine what that temp actually is, if you care to.

These cars are not known for having engine-temp problems - other than IAT problems, and that's a different solution.

If it ain't broke,...
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Old 02-06-2006, 09:40 PM   #4
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your thermostat is the problem. that code is an emmissions code becuase it means your engine isn't getting hot enough to go into closed loop fuel operation, meaning you're dumping fuel through your engine running pig rich. put a 180 degree therm in there. you're not really making any more power with a 160, in fact you're probably making less because the a/f ratio is so off. you might be able to flash the computer and tell it to go to closed loop at a lower temperature, but I don't know if the software allows that kind of change.
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Old 02-07-2006, 09:37 AM   #5
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ok.ok. 160 is "too low", but we are in rare form here in Houston being cold and all. It's like hell has frozen over. I just know a 160 will suit 100 degree weather, but I also don't like the idea of running pig rich. Anyway I guess I'll have to change the T-stat to a 180 till the summer time or until I can get a programmer to shut the damn computer up. I absolutely HATE computers in cars trying to tell me what to do. I guess that's why I liked the 96-98 GTs and Cobras so much. The only check engine light I would ever get with those is for cat delete.
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Old 02-07-2006, 10:35 AM   #6
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The 160* is too cold, the engine needs to be warmer to run correctly. as long as the car is running cool temps it will keep running "pig rich" to try to increase the temp.

I "think" the temp needs to be around 170-175* before it starts to run properly.

You definitly need a tune... besides it will make the SVT run SOOOOO much better.
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Old 02-07-2006, 10:50 AM   #7
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seriously, all you need to keep your car cool, even in those high summer temps, will be a 180 degree thermostat and the factory pulleys to keep your water pump up to speed. I would recommend getting a tune for early fan activation, but it shouldn't be a problem at all. on many cars (not sure about the focus) the fans kick on when the coolant reaches 230 degrees. your car should run fine on the stock thermostat, honestly
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Old 02-07-2006, 09:50 PM   #8
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I run a stock t-stat, underdrive pulleys, black car, in Florida, (similar temps as Houston) with no problems... I'd concur with the rest and say get rid of the 160 t-stat.

Your fan is coming on way earlier than 230 degrees anyway if you are running the a/c (and if you live in houston and DON'T run the a/c during the summer you are a very masochistic person! )
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