Check Engine Light came back on

[StormShadow]

Coming back from San Antonio (approx 70-80 degrees outside) this weekend the check engine light came on. I read it with the SCT and I pulled 0125 (insufficient coolant temp for closed loop fuel ctrl). I cleared the code and tonight was the first time that I drove it again. Check engine light came on as I was heading back from the meeting tonight ( about 30 degrees outside). Checked it and read the same code. Got any ideas?

[bobbywade69]

What T-stat are u running?

[03LightningRocks]

Here are a couple things to get you started.


http://www.coastaletech.com/generic.htm

[03LightningRocks]

Hey Adam...............

Type the reason for the code you posted above in a Google search. You will come up with lots of clues.

Rocks

[03LightningRocks]

Here are a couple items that are easy to check.


http://www.clubfte.com/users/screwy/03.html

[StormShadow]

Thanks Ron, I'll go down the list.

[r1eater]

After reading the description. My Audi had a similar issue. It was a bad O2 sensor or EGT I cant remember exactly.

[03LightningRocks]

What T-stat are u running?
Bobby could very easily be on to something here. Last link...LOL.

http://www.motorage.com/motorage/article/articleDetail.jsp?id=110159

[StormShadow]

Well now that I'm reading this it has me thinking. Sometimes when my truck is cold and I start it up it stumbles for a second before it catches. Its kind of like it starts then hiccups. After that its fine.

[03LightningRocks]

OK....I lied....more info


Indicates the ECT sensor has not achieved the required temperature level to enter closed loop operating conditions within a specified amount of time after starting engine.


Insufficient warm up time
Low engine coolant level
Leaking or stuck open thermostat
Malfunctioning ECT sensor



Now I am going surfing....:D

[L8 APEX]

I anwered this last week. His Efan kit is running a 160 hypertech stat. Jim didn't change the warm up temp for this it is still at the stock 172 value. When it takes longer than 5 minutes to reach 172 the code sets. Sometimes a 160 will run 164-168. I just need to change it to 160 warm up temp value.:tu:

[f150freak]

Excact same code in my truck a couple of weeks ago. Ended up that my stock thermastat was stuck open.

[bobbywade69]

That was what I was thinking!!:tu:




I anwered this last week. His Efan kit is running a 160 hypertech stat. Jim didn't change the warm up temp for this it is still at the stock 172 value. When it takes longer than 5 minutes to reach 172 the code sets. Sometimes a 160 will run 164-168. I just need to change it to 160 warm up temp value.:tu:

[L8 APEX]

99-01 stock programs are 140' warm up temp but the 02-04's are 172 that is where all the issues come from. I thought you were in Germany or I would have given Steve your programming cable and such.

[bobbywade69]

My girl is in Germany, yea just give the cable to Steve next time you see him and I will get it from him!! Thanks!:tu:




99-01 stock programs are 140' warm up temp but the 02-04's are 172 that is where all the issues come from. I thought you were in Germany or I would have given Steve your programming cable and such.

[Sandman]

Well now that I'm reading this it has me thinking. Sometimes when my truck is cold and I start it up it stumbles for a second before it catches. Its kind of like it starts then hiccups. After that its fine.

My truck does this.. and its stock.

[my2002lightning]

Same here.


My truck does this.. and its stock.

[StormShadow]

UPDATE:

Terry fixed the tune on my SCT and it hasn't came back since. :tu: