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Had a problem once with the IAC on one of my 96s. Left FL when it was 62 degrees. Drove home straight through to NE Indiana and when I got there it was 4 degrees. Next morning, car wouldn't start. Feathered the pedal and it acted like it wanted to stay running so I knew it was the IAC. Swapped it out and all was well. I think these things can be somewhat temperature sensitive. Maybe it missed FL.
Nick
Past: 1967 Continental convertible, 1987 TC Cartier, 1996 TC DAE & Signature, 2002 LS V8, 2006 Zephyr, 2010 MKZ AWD, and many more.....
Current: 2010 F-150 Platinum Supercrew 4x4
Wanted: 1967 or 1969 Contnential sedan
Only in my dreams: A Continental Mark II
I have had mine stick a couple of times in freezing cold temps, when I get to where I'm going the idle is high. Last year when it did that I replaced it with a spare that I had and it was fine. This year that replacement is doing the same but not on every trip. I'm starting to think that the one I replaced last year may not have been bad but that it just didn't like the cold and perhaps cleaning it might have helped. If this one keeps it up I'll try cleaning it and see what it does, but it doesn't act up when the temps are in the 20s or above. I know in the summer when I have issues with the IAC cleaning it has always helped me so the same may prove true during the winter.
Ashley's TC & mine do the same thing, more like idles at the fast setting for a bit longer (15-20 seconds) before it calms down. If I were to fire up my Firebird with it's TBI set-up I'm sure it would idle around 1700 RPM for a good 1-2 minutes before it began to back off.
1985 LTD Crown Victoria - SOLD
1988 Town Car Signature - Current Party Barge
They use a pulsed current, steady DC smokes them. Does the same thing to the EGR regulator. I learned that the hard way too. You can sort-of monitor them with an analog voltmeter though. Its not quite accurate but it will show higher voltage with a longer duty cycle. A better way to do it is with a meter that either reads duty cycle directly or with a scope. I lack those, but I've got 30 year old multimeters and long wires.
86 Lincoln Town Car (Galactica).
5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley
91 Lincoln Mark VII LSC grandpa spec white and cranberry
1984 Lincoln Continental TurboDiesel - rolls coal
Originally posted by phayzer5
I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers
Interesting...I always thought the IAC was actuated by a stepper motor, not a solenoid (I believe it may be stepper on other EFI engines). The more you know! So the ECU just increases the duty cycle of the pulse in order to draw the plunger further out?
RyPow 1987 LTD Crown Victoria LX sedan - The "Sand Box" - 73K, towing package 1987 LTD Crown Victoria LX Tutone Tudor - '96 Explorer 5.0 + 5spd swap in the works 1985 Lincoln Town Car Cartier - previously owned by "navguy12" from thelincolnforum.net 2007 Lincoln Town Car Signature Limited, 102k, daily driver 2006 Mercury Grand Marquis LS, 115k, winter beats 1977 Lincoln Continental Town Car, 42k 2012 F-150 5.0L 4x4, HD payload pkg (towing/hauling)
2015 Toyota RAV4 XLE AWD (better half's)
yep, exactly so. It returns to the closed position with a spring. The longer the duty cycle, the more it pushes against the spring and opens the thing up further.
Later designs might use a stepper motor, but the old EEC IV wasn't quite that sophisticated.
86 Lincoln Town Car (Galactica).
5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley
91 Lincoln Mark VII LSC grandpa spec white and cranberry
1984 Lincoln Continental TurboDiesel - rolls coal
Originally posted by phayzer5
I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers
I've never had problems with the gaskets from the part store. Most of the time you don't even need to change it unless you tear it. Worst that will happen is it will suck air and idle high.
86 Lincoln Town Car (Galactica).
5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley
91 Lincoln Mark VII LSC grandpa spec white and cranberry
1984 Lincoln Continental TurboDiesel - rolls coal
Originally posted by phayzer5
I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers
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