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Topic Review (Newest First)
01-09-2017 01:11 AM
amc49 There is commonly a seal around the throttle shaft inboard, but if it has gone bad then the outer dust seal o-ring for the TPS can be the stopper of a minor vacuum leak there.

Lots of people clean the TBs with solvent and then those inner seals swell up from solvent exposure, working the TB at that time can easily tear/shred the seal since exposure also makes it much softer too. When I clean one I wait 24 hrs before moving it. Zero issue then, the solvent being a VOC evaporates over time to then leave the seal pretty much like it was before.

If you yank TB with no gasket change..............well, often a mistake, the gasket takes a set and no way does it reseal like before. I don't care how good it looks.
01-08-2017 04:13 PM
charliebrownboy Thank you for reply. I did exactly the same as mine was also cracked allowing a vacume leak. I have since sold the vehicle.
01-08-2017 04:26 AM
2006 Focus idle issue solved

Just went through all this. Started when I cleaned the throttle body...No vacuum leaks, but found the Throttle Position Sensor broke on the side.

Replaced throttle body with sensor attached, now works fine.
11-20-2015 02:15 AM
BowerR64 If you get a tune from Tom doesnt the "ECU learning" thing get turned off?

I just started having issues after changing my battery also, it was going on 5 years and before i started having any issues i just replaced it because i know these cars are bad for burning up alternators.

I thought my IAC was causing problems so i unhooked it but i still had issues. It wouldnt start correctly when it was cold but with it unhooked the idle wouldnt jump around like it had been.

I have an AEM A/F gauge installed in my exhaust and i notice when the car revs up during idle my gauge is showing lean. It goes from normal where it bounces around 14.7 down to around 12

Ive cleaned my IAC, MAF, and the Throttle body. First was the IAC then put it back in but i never thought about the gunk running down into the IAC i may need to check it again.

I wonder about the TPS though, how long do those things go before they need cleaned or replaced?
02-04-2015 07:25 PM
Nmarzoli04 Poked around a bit tonight and found that the TPS was a little loose on the TB. Think that could be it?
02-04-2015 05:27 PM
Nmarzoli04 Alright bringing this thread back from the dead a bit. I replaced my leaky clutch master cylinder last weekend ( which is leaking again so I have to replace it again, great). Now when I press in the clutch or drop into neutral, the rpms surge for about five seconds before dropping down to regular idle.

Since I had to move the hose hooking the TB to the air box, could I have cracked the hose that leads from to the intake manifold? Not sure what else was causing it. I thought maybe I didn't bleed the clutch enough, but that seems unrelated and all the gears shift smoothly with no problems. Any thoughts?
08-15-2014 04:45 AM
sailor Humphrey - hope you meant MPG not MPH.

High idle shouldn't hurt the clutch much, you only slip it moving from a stop & the rest of the shifts should match pretty close so you don't have to slip it then.

High idle would affect MPG as the engine is using fuel when not needed.

That throttle plate needs to get centered & adjusted for sure. Easiest off the car though you wouldn't even have to unhook the cables to do it - just pull it off & lay a towel underneath to cover the engine, maybe a board for a work surface.

Loosen the adjustment screw & the throttle plate screws & wiggle the plate position to let it close completely to the bore. THEN tighten the plate screws & recheck - it needs to close fully & evenly then without binding. AFTER that's done, you can use the adjustment screw to give it a slight crack open for a starting point. Recheck again for smooth operation & no binding.

Once that's done you can reinstall it completely for engine start & final adjustment.

Get the engine running & warmed up, then get your adjustment screwdriver handy to tweak the adjustment. You'll be disconnecting the IAC & using your hand on the throttle to keep it running as needed while you adjust the stop screw to get about 525 rpm steady from that adjustment. Basically getting it to run at a low idle without you holding it, then checking the dash display & readjusting it 'till you get that speed.

The idea here is to get a mechanical idle rpm adjustment BELOW that controlled by the IAC, so the IAC is slightly open & able to control idle speed at normal warmed up condition.

IF the mechanical idle is too high, the IAC can never drop it to a target speed since with that fully closed it still idles too high.

Should you find it idles high even with the throttle plate closed & IAC disconnected, you can be sure either the IAC is stuck partially open or there's a vacuum leak that hasn't been found.

Hope that explains both practice & theory enough to be of help.
08-15-2014 03:44 AM

I still have this issue. Mine is probably going to be that I've not yet fixed the placement of the flap in my TB as I had removed the screw holding it in and took out the flap and when installing it I had it upside down or backwards but Ive since put it back but still is a little out of place.. I also had a vacuum leak which I took care of right after getting the car. Another problem I found while trying to solve this was that the throttle cable was fraying inside its casing causing it to stick- dished out 150$ something for that. Ive yet to replace my IAC as I've cleaned it twice but not sure if that did any good. Once with carb cleaner and another with diesel and a airgun.

As for what mine is doing, the RPM holds at a high rate upon decelerating but once I arrive at full stop, it will lower to an acceptable RPM and that is pretty much it. Again, probably due to the small gab in my TB.

@Sailor, my MPG has also dropped since this issue with high idle. I've already replaced the clutch (and components) with a clutch kit from RockAuto. I am wondering if that high idle is what caused the clutch disk to turn to dust.. Honestly, it wasn't that hard to do being as it was my first time performing such a repair- my and my dad had it down in an hour or so. I am sure the next time we'd cut down on that time as we've got the experience.
08-14-2014 08:32 PM
sailor OK, sounds like yours is "stuck" at 1,000 rpm for an idle speed (I assume it doesn't change when warm).

Items to check include:

First - check throttle cable & throttle plate at the throttle body to make sure there isn't a mechanical hangup keeping the throttle slightly open.

Second - check for vacuum leaks from any hoses attached to the intake. PCV from engine to intake is a particularly common on for problems.

Third - Check IAC If it's sticky/stuck you may be able to clean & get it working again without replacement.

08-14-2014 12:57 PM
charliebrownboy My symtoms are as follows: On start and in neutral revs are just over 1000. When clutch is depressed without putting into first gear revs go high to 1300, on selecting first revs come down to just 1000 or just below. On changing up to 2nd when putting in clutch, revs climb again. On releasing clutch and engaging gear revs come down. This happens when depressing clutch to change gear. Sorry if I have not explained myself more clearly
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