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Old 11-18-2009, 06:51 PM   #11 (permalink)
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I know the Taurii along with the other fords idle high on cold start, or even when the engine is warm, its part of a process to warm up the engine faster, it has a non-adjustable idle speed like the older cars, its all computer programmed and will adjust itself when the computer feels its okay to adjust, and from experience, my taurus will idle high ~1800 for a good 10 secs in our cold canadian winters...lol
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Old 11-18-2009, 07:46 PM   #12 (permalink)
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QUOTE (NoBull5393 @ Nov 18 2009, 08:51 PM)
Quote:
I know the Taurii along with the other fords idle high on cold start, or even when the engine is warm, its part of a process to warm up the engine faster, it has a non-adjustable idle speed like the older cars, its all computer programmed and will adjust itself when the computer feels its okay to adjust, and from experience, my taurus will idle high ~1800 for a good 10 secs in our cold canadian winters...lol[/b]
Not to argue, but don't higher RPMs = more wear on the engine? Is it good to race the engine so high when the engine is cold and the oil is not distributed throughout the engine yet?

Seems that lower RPMs would be better during warm up.
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Old 11-18-2009, 08:10 PM   #13 (permalink)
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QUOTE (97 Blue Taurus Vulcan @ Nov 18 2009, 08:46 PM)
Quote:
QUOTE (NoBull5393 @ Nov 18 2009, 08:51 PM)
Quote:
I know the Taurii along with the other fords idle high on cold start, or even when the engine is warm, its part of a process to warm up the engine faster, it has a non-adjustable idle speed like the older cars, its all computer programmed and will adjust itself when the computer feels its okay to adjust, and from experience, my taurus will idle high ~1800 for a good 10 secs in our cold canadian winters...lol[/b]
Not to argue, but don't higher RPMs = more wear on the engine? Is it good to race the engine so high when the engine is cold and the oil is not distributed throughout the engine yet?

Seems that lower RPMs would be better during warm up.
[/b][/quote]

Though your logic makes sense, ill give you that, but theres a reason Ford recommends 5w20 oil, so it stays more fluid like in the winter, so it can afford to "race" in order not to only warm the engine faster, but to warm up the other components either by heat transfer or high fluid rate so that they dnt get damaged due to the stress of the cold (power steering pump, rack and pinion, tranny...) I'm not saying you dont have a problem, its just how the system was made...1800 rpm initial idle for max 15 secs is normal, if youve gotten anything over 2200rpm, then i would start to look into it, but ive seen my car up to 2000 in rly cold weather and i have a 2002 taurus w/ vulcan. Hope this helps, Good Luck
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Old 11-18-2009, 10:18 PM   #14 (permalink)
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I tried cleaning the MAF and it still does the same thing when it's cold. It's strange, when it does the 2000 rpm and above idle, it feels as though something is sticking; it will rev like that for a few seconds then suddenly drop down to 1800 and do it's normal thing. Like I said, I'm fairly certain that an idle this high is not normal. The 2000 Taurus with the duratec that I test drove idled at 1500 and quickly lowered. The fact that mine is sometimes 2100 and sometimes 1800 means there has to be something wrong. Or, maybe they just changed the pcm programming for the 2000 model year, and this is normal for the 99?

I also had a 1996 Taurus GL wagon with the Vulcan (I wish I kept that car), and that also did not idle like the 99 does. It would start at 1500 and quickly go down. So, at this point, I guess I'll look into the TPS. The car doesn't show any other symptoms of a bad TPS, but it's still something I'll look into. I've pretty much eliminated any other cause I can come up with.
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Old 11-19-2009, 06:29 AM   #15 (permalink)
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Is the IAC valve a Ford part or aftermarket? If it is an aftermarket, go pull one from the junkyard (Ford part) and put it on your car. You may notice a drop in the RPMs. I do not feel that the aftermarket ones are on par with the Ford ones. I have a video where I put the aftermarket IAC on mine and RPMs almost jumped to 3K. I went to the junkyard and pulled a Ford IAC and put it on my car, and my car now cranks just as NoBull5393 describe (as Ford specifies).





Idle with aftermarket parts:

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Idle with Ford parts

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If you search "high idle" in these threads, you are going to find that it usually means you have some unmetered air getting into your engine... You have a vacuum leak or an air leak somewhere. You can usually spray carb cleaner around all your PVC lines to tell if you have a leak.
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Old 11-19-2009, 11:24 AM   #16 (permalink)
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The high idle control by the PCM is from a table that is looking at the engine coolant temp sender. This may be faulty.
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Old 11-19-2009, 04:04 PM   #17 (permalink)
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QUOTE (SHOZ123 @ Nov 19 2009, 12:24 PM)
Quote:
The high idle control by the PCM is from a table that is looking at the engine coolant temp sender. This may be faulty.[/b]
I tried the carb cleaner test on the PCV lines and I didn't notice anything. I did replace the PCV elbow as well as the PCV valve, all the other lines look like they're in good shape. As far as the coolant temp sender, I'll definitely check that out. When I start the car in the morning, the gauge sits way below "C" until it warms up, maybe that means the sender is defective? Also, the IAC is a Ford part, I had it replaced at Stoneham Ford in MA.

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Old 11-20-2009, 12:46 AM   #18 (permalink)
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The gauge and the PCM have two different temp senders. The PCM one (ECT) has two wires, the gauge one only has one.
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Old 12-01-2009, 11:03 AM   #19 (permalink)
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I finally spent some time on the car, and i'm pretty sure that neither the coolant temp sender nor the tps is causing the problem. I ended up buying a ScanGauge II to hook up to the OBD, and the readings for the coolant temp sender came out normal. If it means anything to you guys, the readings for the TPS on the ScanGauge were 17 when my foot wasn't on the gas, and they would increase when I put my foot on the gas.

I tried unplugging the TPS and starting the car, and it still started the same way. I'll have to spend some time going through the vacuum lines again, as I can't think of anything else it could be. It's been starting at 2100-2200 rpm consistently now, so it's starting to aggravate me a lot. I'm starting to wonder if maybe the new intake manifold gaskets are leaking, although I don't have any codes showing.

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Old 12-09-2009, 06:08 PM   #20 (permalink)
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OK, I did some playing around with the car, and I'm 99% certain it's not a vacuum leak. I have narrowed it down to the IAC valve. I unplugged the valve before starting the car, and it didn't idle high at all; instead it idled around 400-500 rpm very roughly. When I plugged it back in while it was running, it jumped right up to 1600 rpm.

This would lead me to believe that either something is wrong with the IAC, or something is causing the IAC to idle the car high when its cold. If it's not a problem, could someone tell me what sensors or other miscellaneous things affect/control the IAC? I know that the coolant temp sender was mentioned before, but I have eliminated that as a possibility. As I said before, the IAC on the car now is a new Ford part, so I'm fairly sure that the IAC itself is not the problem.

Any help would be appreciated, this thing is driving me nuts. Its gotten to the point where I automatically hit the remote start whenever I approach the car to get in, otherwise I end up sitting for a long time.

Thanks in advance---
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2002 Saab 9-3 SE Hatchback 2.0 I4 Turbo 85,000 mi
2009 Ford Fusion SE Duratec 2.3 I4 29,000 mi

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