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#1 |
Lexus & 550's
Join Date: Apr 2005
Location: Bossier City LA
Posts: 556
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There is also a cold temp sensor that helps with the cold start injector timing and richens the fuel when cold. If it always reads cold then it will always see the need to run rich. Try checking that sensor.
Russ |
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#2 |
3" Exhaust
Join Date: Oct 2005
Location: San Diego, Ca
Posts: 190
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where would this sensor be located? the high idle only occurs when cold. But it warms up fine, and when it does it idles normally. I'm also starting to suspect that my cat is plugged up.
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#3 | |
1000whp postwhore
Join Date: Jun 2005
Location: Mojave Desert, Calif.
Posts: 1,705
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This sensor is called the Cold Start Injector Time Switch, pg FI-112 in TSRM. It only operates during cranking and engine that is below 56*. Never after the engine is running. When active (only while cranking the motor), it supplies 12v to the Cold Start Injector, which will open and squirt a bunch of fuel into the intake manifold. To prevent flooding, this switch will stop working automatically (heater element inside it)if you crank the engine over for more than 12 seconds, and it hasn't started. Quoting myself: The EGR passages on the 7m usually will plug up with miles, and then you don't get any EGR gasses thru. This problem is usually not detected (nor cause troubles)until you have to go in for an emissions test. It causes high NOx readings. So...... You won't have idling or running troubles with plugged EGR passages, or inop valve.
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Had a Red 1989 N/A. Automatic. Sports Pkg. w/wing. TEMS, and some nice MODS. Sold to a friend 10/08/08. |
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#4 | |
3" Exhaust
Join Date: Oct 2005
Location: San Diego, Ca
Posts: 190
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#5 |
3" Exhaust
Join Date: Oct 2005
Location: San Diego, Ca
Posts: 190
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i looked at the spark plugs and found oil on them. im gonna put new ones in, but can i clean the housing with carb cleaner, or should i use something else?
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#6 |
1000whp postwhore
Join Date: Jun 2005
Location: Mojave Desert, Calif.
Posts: 1,705
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Carb spray down the holes will work. Or brake cleaner spray is less strong, safer.
The oil down on the spark plugs/boots can cause a misfire. You need to fix the leak. Usually the V/C gaskets, #1 & #2. Not the center one. Not a difficult job at all.
__________________
Had a Red 1989 N/A. Automatic. Sports Pkg. w/wing. TEMS, and some nice MODS. Sold to a friend 10/08/08. |
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#7 | |
3" Exhaust
Join Date: Oct 2005
Location: San Diego, Ca
Posts: 190
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Also, could the oil down the spark plugs be a cause of worn piston rings? if so, would I need a valve job or a rebuild? |
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#8 |
1000whp postwhore
Join Date: Jun 2005
Location: Mojave Desert, Calif.
Posts: 1,705
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OK...need to know before we go further...did you have oil on the sparkplug electrodes (the part that fires), or on the outside, and the rubber plugwire boots???
Also...... Worn piston rings will usually cause some oil burning and blue smoke out the tail pipe. It will eventually cause sparkplugs to foul (stop firing).
__________________
Had a Red 1989 N/A. Automatic. Sports Pkg. w/wing. TEMS, and some nice MODS. Sold to a friend 10/08/08. |
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