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Thread: Very High Idle - Throttle Body and TPS sensor questions Reply to Thread
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Topic Review (Newest First)
Today 12:21 PM
roabarca What do you mean with IAC Gasket? I did not change anything with that name bro
Today 12:18 PM
roabarca No men...I dont even know thay valve is that...do you know thename of that IAC in spanish? Or where the valve is ubicated? Only thing I want is to feel the power of my car because with this TPs the car feels slow and without power
Today 10:20 AM
qweesy bring your old TPS and have them cross ref the number but, amc brought up a good point when you swapped your IAC (Idle air control valve did you replace the IAC gasket aswell?
Today 07:41 AM
roabarca I Cant buy the same TPs I had before because it wont work because it rotational movement goes counter clockwise and the acelerator body on my car goes clockwise movement...so it will break the TPS...or at least thats what I think...and the second commentI did not understand jaja sorry but Im not very into this "cars things" and that technical words you used got me confused
Today 01:07 AM
amc49 Did you replace the IAC gasket? Vacuum leak.

TPS should not have to rotate into place if you have the correct one and you don't use a scope to set them either, you can do it with a $10 voltmeter. But shouldn't need to 'set' them anyway, correct one will start and run perfectly by simply bolting it in.

When you unplug sensors the PCM substitutes electrical values that have worked before.
Today 01:01 AM
qweesy take the old TPS up with you and get the same replacement. get the auto TPS if thats what fits and you had before, maybe you got a wonk ass ride bro.
Yesterday 07:48 PM
roabarca Hi men...hope you can help with this strange problem...the deal is that my ZX3 2003 Manual Transmission have the "check engine" light on, I scanned the car and the result was that my TPS Sensor was bad, I just bought a new one. The problem was that when I started to place the new TPS I realized that the old TPS (placed on my car) was the TPS for an automatic transmission Focus not for Manual Transmission...so I tough: "ok thats why the TPS failed" but NO.....because when I was trying to place the new TPS (it has like blue gum circle around it) i notice that it doesnt fit on my car! So why my car had a TPS for automatic transmission? And why when I asked for my real TPS for manual trans...it doesnt fit on my car? Please help me with this because my car is not giving me the power it could give
01-19-2013 12:04 AM
rycodge So I disconnected my new iac valve tonight and low and beyold the damn car idles like you would expect!
Does this mean the replacement iac is faulty?? I'm slightly confused but I'm assuming the cheap autozone part was d.o.a....
01-18-2013 05:47 PM
rycodge I'm sitting here at work almost starting to worry about a cracked intake manifold.

Here's why it *could* be cracked.

1. Car is a salvage title with front passenger side impact
2. Engine just sounds "loud" from the interior (new motor mount helped a lot, but this engine is still LOUD anywhere above idle when I compare it to my 2001 GTI 1.8T)
3. Vacuum hoses look great, but I can't get my idle under control.

I'm going to try unplugging the IAC valve tonight to see how it behaves at idle.

Are there any common places where the zetec intake manifolds would crack?

Any help is greatly appreciated
01-18-2013 03:49 PM
rycodge So I've replaced the IAC with a new valve. After cleaning up the old one, the plunger was very stiff to move and hooking up the old IAC to a 9V to actuate the plunger didn't do the trick. I later stepped up to 12v 2amp current from the battery charger to test and no dice.

Problem is the car is still idling very high between shifts and it only calms down when the car is not moving for about 10 seconds. I disconnected the TPS just to see and the car was exhibiting the exact same problems. No CEL code though??

One interesting thing the car was is doing after replacing the IAC valve is somtimes the car will WANT to fall down to like 1000 rpm when I depress the clutch and it will "bounce" between 1000-2000 RPM a few times, then stay up around 2200 until I come to a complete stop. It doesn't always do this, but it seemed to be 1/10 times I depressed the clutch while driving down the road.

How does the engine even calculate the proper throttle response when the TPS is disconnected? Does it use the O2 sensor and MAF to guess what the air / fuel should be?

Do you think I may have replaced my bad IAC valve with a defective valve?

Any other sensors that could be causing this? I've tried two different tps's.

Maintenance I've done to the engine so far:

New crank sensor
New pre-cat O2 sensor
New passenger motor mount
New air filter
New spark plugs + wires + coil pack
New PCV valve - vacuum line looks good.

This is the last engine issue I'm trying to sort out! It's driving me mad lol.
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