I want to get some opinions on what's going on with my ' 87 grand marquis. So here's the spill; the car starts fine cold and holds idle. Once it gets up to temperature and the thermostat opens up. If the car is turned off and started back up immediately after, it will turn over but not hold idle without giving it some gas. I'm under the suspicion it has something to do either with the evap canister system or the ignition module. What do you think? Thanks all for the suggestion!
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Cold start; hot no start?
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Coolant temp sensor, or possibly the IAC getting stuck would be my guess too. If it was ignition, giving it some throttle wouldn't help.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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It will be on the passengers side of the motor. near the front on a pipe coming up and out of the lower intake. Two wire plug connected to it.
When ordering dont mistake it for the one that is on the drivers side directly into the lower intake manifold. That is the one that goes directly to the replace engine light on your dash.~David~
My 1987 Crown Victoria Coupe: The Brown Blob
My 2004 Mercedes Benz E320:The Benz
Originally posted by ootdega
My life is a long series of "nevermind" and "I guess not."
Originally posted by DerekTheGreat
But, that's just coming from me, this site's biggest pessimist. Best of luck
Originally posted by gadget73
my car starts and it has AC. Yours doesn't start and it has no AC. Seems obvious to me.
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Looks like the plug for the replace engine coolant sensor just to the 2 o'clock on your circled portion.~David~
My 1987 Crown Victoria Coupe: The Brown Blob
My 2004 Mercedes Benz E320:The Benz
Originally posted by ootdega
My life is a long series of "nevermind" and "I guess not."
Originally posted by DerekTheGreat
But, that's just coming from me, this site's biggest pessimist. Best of luck
Originally posted by gadget73
my car starts and it has AC. Yours doesn't start and it has no AC. Seems obvious to me.
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If you still have the factory coolant temp sensor for the replace engine light it would fit right over the stud out of the unit.
If your factory coolant temp sensor for the replace engine light was removed and an after market coolant temperature gauge was put into its place you wont have a place for the wire.
I circled the sensor in yellow.~David~
My 1987 Crown Victoria Coupe: The Brown Blob
My 2004 Mercedes Benz E320:The Benz
Originally posted by ootdega
My life is a long series of "nevermind" and "I guess not."
Originally posted by DerekTheGreat
But, that's just coming from me, this site's biggest pessimist. Best of luck
Originally posted by gadget73
my car starts and it has AC. Yours doesn't start and it has no AC. Seems obvious to me.
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Sounds like you’ve covered the typical problem areas.
Won’t hurt to set the base idle just in case someone before has screwed with it: https://www.muscularmustangs.com/idlereset.php
Won’t hurt to check codes. If you don’t have a reader: http://www.fuelinjectedford.com/page13.html note that you don’t have a check engine light so you will need to use the test light or voltmeter.
Vacuum leaks also do some weird things to these cars. Check those out.1990 Country Squire - weekend cruiser, next project
1988 Crown Vic LTD Wagon - waiting in the wings
GMN Box Panther History
Box Panther Horsepower and Torque Ratings
Box Panther Production Numbers
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There is also an air temperature sensor. #5 intake runner, driver's side, looks just about like the coolant sensor.
Is the IAC a Motorcraft part? Some of the aftermarket ones don't seem to work right.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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Thanks for the tips, guys. I'll look into setting the base idle first since it seems pretty easy to do. I haven't been able to find the air temperature sensor. Anyone want to snap a shot of its location for me? I would greatly appreciate it.@Ryan.Madison68
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Lower intake plenum... driver side of engine between the front 2 cylinders.
Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -- Albert Einstein
rides: 93 Crown Vic LX (The Red Velvet Cake), 2000 Crown Vic base model (Sandy), 2003 Expedition (the vacation beast)
Originally posted by gadget73... and it should all work like magic and unicorns and stuff.Originally posted by dmccaigOverhead, some poor bastards are flying in airplanes.
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