How to tell Im in open/closed loop?
09-12-2006, 07:09 PM
#1
Resident Ford Troll
Thread Starter
Join Date: Jul 2006
Location: Delaware
Posts: 6,717
How to tell Im in open/closed loop?
My car has been getting ****ty gas milage now that its not 100 degrees out anymore. My car runs a bit cooler and I think my car might not even leave open loop (or is it closed loop?). The temp guage only goes up like 3 dashes from 130. Not even halfway on the guage. Am I running too cold. How can I test to tell whether or not my car is running correctly?
09-12-2006, 07:16 PM
#4
5th Gear Member
Join Date: May 2005
Location: Central New York
Posts: 3,850
RE: How to tell Im in open/closed loop?
car should operate between 180 and 200 degrees the middle dash is 200 so below that is okay, i'd be alot more concerned with running hot than cool as long as it rises from 130 up to near the middle your fine. Whens the last time the coolant was flushed and filled? Try that and replace the t stat with a 180*
09-12-2006, 09:53 PM
#5
4th Gear Member
Join Date: Feb 2006
Location: Seattle, WA
Posts: 1,375
RE: How to tell Im in open/closed loop?
ORIGINAL: WhiteFoxGT
My car has been getting ****ty gas milage now that its not 100 degrees out anymore. My car runs a bit cooler and I think my car might not even leave open loop (or is it closed loop?). The temp guage only goes up like 3 dashes from 130. Not even halfway on the guage. Am I running too cold. How can I test to tell whether or not my car is running correctly?
My car has been getting ****ty gas milage now that its not 100 degrees out anymore. My car runs a bit cooler and I think my car might not even leave open loop (or is it closed loop?). The temp guage only goes up like 3 dashes from 130. Not even halfway on the guage. Am I running too cold. How can I test to tell whether or not my car is running correctly?
Closes Loop - Idle and Part Throttle Cruising, In this strategy the computer is using feed back from the O2 sensors to adjust the Injector Pulsewidth.
I am not sure how one could tell if the car was in OL or CL.
However, if you pull the codes you will likely find out what the problem is.
Likely suspects are probably O2's, ECT, and ACT (but check the codes before replacing parts)
Good Luck,
jason
09-13-2006, 12:02 AM
#6
Resident Ford Troll
Thread Starter
Join Date: Jul 2006
Location: Delaware
Posts: 6,717
RE: How to tell Im in open/closed loop?
There is no CEL on, and the car feels like its running fine and whatnot, I've just been getting pretty bad gas milage lately. I cant tell you what T-stat is in the motor because i didnt build it. I might ask the guy I bought it from. I was just curious as to a method that tells you when the computer "knows" the car is fully warmed up. I've been talkin to a good friend of mine (mustang guru) and he says running a 160 t-stat is fine. I kno all about the 180* blah blah but thats what he swears by.
09-13-2006, 12:45 AM
#7
5th Gear Member
Join Date: Jan 2006
Location: Puerto Rico
Posts: 3,926
RE: How to tell Im in open/closed loop?
ORIGINAL: WhiteFoxGT
There is no CEL on, and the car feels like its running fine and whatnot, I've just been getting pretty bad gas milage lately. I cant tell you what T-stat is in the motor because i didnt build it. I might ask the guy I bought it from. I was just curious as to a method that tells you when the computer "knows" the car is fully warmed up. I've been talkin to a good friend of mine (mustang guru) and he says running a 160 t-stat is fine. I kno all about the 180* blah blah but thats what he swears by.
There is no CEL on, and the car feels like its running fine and whatnot, I've just been getting pretty bad gas milage lately. I cant tell you what T-stat is in the motor because i didnt build it. I might ask the guy I bought it from. I was just curious as to a method that tells you when the computer "knows" the car is fully warmed up. I've been talkin to a good friend of mine (mustang guru) and he says running a 160 t-stat is fine. I kno all about the 180* blah blah but thats what he swears by.
09-13-2006, 02:36 AM
#8
2nd Gear Member
Join Date: Jun 2005
Location:
Posts: 158
RE: How to tell Im in open/closed loop?
Naw, code scanner wont work at an autostore more than likely. I work at an autozone and we do free check engine tests on OBDII equipped vehicles (96 and up). 93 might require a garage for that info.
ORIGINAL: TMeyer29
u need a code scanner.o to a auto store while your car is warmed up and have them check
u need a code scanner.o to a auto store while your car is warmed up and have them check
09-13-2006, 02:42 AM
#9
5th Gear Member
Join Date: Jan 2006
Location:
Posts: 2,103
RE: How to tell Im in open/closed loop?
i just use my buddys 'Genisis' scanner. Certain scanners will scan foxes. The connecter is under the hood by the drive side shock tower.
ORIGINAL: jonboy5.0
Naw, code scanner wont work at an autostore more than likely. I work at an autozone and we do free check engine tests on OBDII equipped vehicles (96 and up). 93 might require a garage for that info.
Naw, code scanner wont work at an autostore more than likely. I work at an autozone and we do free check engine tests on OBDII equipped vehicles (96 and up). 93 might require a garage for that info.
ORIGINAL: TMeyer29
u need a code scanner.o to a auto store while your car is warmed up and have them check
u need a code scanner.o to a auto store while your car is warmed up and have them check
