Runs rich only with lights on!!
Thread Starter
Joined: Nov 2003
Posts: 1,223
Likes: 4
From: SoCal
Originally posted by Barban
i had almost the same problem before i lost my engine. when my lights were on my idle would go crazy(1000-2500) and the car would run very rich. it cost me my engine basically.
i had almost the same problem before i lost my engine. when my lights were on my idle would go crazy(1000-2500) and the car would run very rich. it cost me my engine basically.
Thought of a blown motor scares the crap out of me...been through 3 motors already.
Thread Starter
Joined: Nov 2003
Posts: 1,223
Likes: 4
From: SoCal
Originally posted by clayne
Well ISC as well.
If the ISC isn't working it will not compensate airflow past the TB, given additional load.
Well ISC as well.
If the ISC isn't working it will not compensate airflow past the TB, given additional load.
Rotary Freak
Joined: Jan 2004
Posts: 1,899
Likes: 0
From: tampa
unplug the connecter and see if the idle changes. also when yoou are low on freon the low pressure switch opens and disengages the ac clutch so it will not "lock up" they do lock up sometimes though.
Thread Starter
Joined: Nov 2003
Posts: 1,223
Likes: 4
From: SoCal
Originally posted by mad_7tist
unplug the connecter and see if the idle changes. also when yoou are low on freon the low pressure switch opens and disengages the ac clutch so it will not "lock up" they do lock up sometimes though.
unplug the connecter and see if the idle changes. also when yoou are low on freon the low pressure switch opens and disengages the ac clutch so it will not "lock up" they do lock up sometimes though.
As far as the A/C...I already knew that, I just didn't want to respond to something different and go off topic
But I appreciate it, I'm sures a lot of people didn't know that.
If it's only after the engine bay is real warm and after sitting for a little while, look at the fuel temp sensor. The fuel temp sensor is located on the secondary fuel rail. It tells the ECU that the fuel is hot and corrects the ECU's fuel maps to post start mode.
The fuel vaporizes in the rail when it heat soaks.
A faulty fuel temp sensor would actually cause a lean condition and would make your idle hunt, backfire, etc.
This would only be on warm starts.
The fuel vaporizes in the rail when it heat soaks.
A faulty fuel temp sensor would actually cause a lean condition and would make your idle hunt, backfire, etc.
This would only be on warm starts.
Thread Starter
Joined: Nov 2003
Posts: 1,223
Likes: 4
From: SoCal
Originally posted by zkeller
If it's only after the engine bay is real warm and after sitting for a little while, look at the fuel temp sensor. The fuel temp sensor is located on the secondary fuel rail. It tells the ECU that the fuel is hot and corrects the ECU's fuel maps to post start mode.
The fuel vaporizes in the rail when it heat soaks.
A faulty fuel temp sensor would actually cause a lean condition and would make your idle hunt, backfire, etc.
This would only be on warm starts.
If it's only after the engine bay is real warm and after sitting for a little while, look at the fuel temp sensor. The fuel temp sensor is located on the secondary fuel rail. It tells the ECU that the fuel is hot and corrects the ECU's fuel maps to post start mode.
The fuel vaporizes in the rail when it heat soaks.
A faulty fuel temp sensor would actually cause a lean condition and would make your idle hunt, backfire, etc.
This would only be on warm starts.
Wow, so far I have a pretty long list of things to check this weekend!
Thread Starter
Joined: Nov 2003
Posts: 1,223
Likes: 4
From: SoCal
If any body comes across this thread who have the same symptoms I had...just want to let you know it was the water thermosensor. It's located behind the thermostat housing incase you didn't know.
You might want to change your thermostat as well and change your water thermoswitch with the miata one while your at it.
Thanks for all the input guys!
You might want to change your thermostat as well and change your water thermoswitch with the miata one while your at it.
Thanks for all the input guys!
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