Turbo 5.0 goes to WOT by itself.

nurkvinny · March 3rd, 2011, 09:59 PM

Ha, now if I can ever find a spare hour to get back out to the garage...

badshoe · March 4th, 2011, 12:19 PM

An IAC that's mounted backwards can cause it. The wire connector should face the air filter side of the throttle body.

nurkvinny · March 4th, 2011, 02:44 PM

Originally Posted by badshoe

An IAC that's mounted backwards can cause it. The wire connector should face the air filter side of the throttle body.

This is an old picture from a previous owner. The engine bay has been MUCH improved since this pic, but it shows the orientation of the IAC...

nurkvinny · March 5th, 2011, 02:33 PM

So...

Unbolted the TPS again, realigned and rebolted.
Removed IAC, cleaned with TB cleaner, reinstalled.
Checked all vacuum lines a third time.

Started it up, idled out into driveway, sitting in place shifted between N, R, and 1 repeatedly, revved to all different RPMs while in gear and not.

Vacuum showed 13-20 depending on engine speed and held steady when engine speed was constant. Stumped on brakes hard a couple times to rule out bad booster.

Car does have a very noticeable stumble while tapping the throttle from an idle. Falls on its face when you floor it. Cap and rotor look shitty, will clean them up. Plugs look good, same for wires.

Car idles high, IMO, about 1000-1250, but did not experience WOT issue.

Think the TPS could cause the stumble, high idle, etc?

Thanks.

93hatch · March 5th, 2011, 07:39 PM

yup

nurkvinny · March 6th, 2011, 01:28 PM

New TPS installed just now. Things were 75% better. No idle surges. Was able to goose the pedal right after starting it and it responded tons better.

Still some hesitation now though after it ran for a minute or so. Maybe there is a learning period or something like that when you replace the TPS?

nurkvinny · March 6th, 2011, 02:32 PM

Found the re-learning procedure. Doing it shortly.

93hatch · March 6th, 2011, 02:58 PM

you set the voltage right

nurkvinny · March 6th, 2011, 04:49 PM

Originally Posted by 93hatch

you set the voltage right

Yes. I got a .98

nurkvinny · March 10th, 2011, 08:07 PM

Hasn't surged since.

Traded the turbo 5.0 BMW for a beautiful 89 Fox.

March 4th, 2011, 12:19 PM	#22
badshoe Regular Join Date: Dec 2007 Posts: 59 iTrader: 0 reviews	An IAC that's mounted backwards can cause it. The wire connector should face the air filter side of the throttle body. __________________ BadShoe Productions, How-To-DVD's specializing in Ford drivetrains www.BadShoeProductions.com

March 5th, 2011, 07:39 PM	#25
93hatch Banned 1992 Lx 11.39@119.24 Join Date: Jan 2008 Location: Az Posts: 11,644 iTrader: 0 reviews	yup __________________ [QUOTE=93mustank;2577445]We speed tested my right arm for quickness in shifts... So he could design the cam for proper shift recovery.[/QUOTE]

March 6th, 2011, 02:58 PM	#28
93hatch Banned 1992 Lx 11.39@119.24 Join Date: Jan 2008 Location: Az Posts: 11,644 iTrader: 0 reviews	you set the voltage right __________________ [QUOTE=93mustank;2577445]We speed tested my right arm for quickness in shifts... So he could design the cam for proper shift recovery.[/QUOTE]

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March 3rd, 2011, 09:59 PM	#21
nurkvinny Newbie Join Date: Feb 2011 Posts: 13 iTrader: 0 reviews	Ha, now if I can ever find a spare hour to get back out to the garage...

March 5th, 2011, 02:33 PM	#24
nurkvinny Newbie Join Date: Feb 2011 Posts: 13 iTrader: 0 reviews	So... Unbolted the TPS again, realigned and rebolted. Removed IAC, cleaned with TB cleaner, reinstalled. Checked all vacuum lines a third time. Started it up, idled out into driveway, sitting in place shifted between N, R, and 1 repeatedly, revved to all different RPMs while in gear and not. Vacuum showed 13-20 depending on engine speed and held steady when engine speed was constant. Stumped on brakes hard a couple times to rule out bad booster. Car does have a very noticeable stumble while tapping the throttle from an idle. Falls on its face when you floor it. Cap and rotor look shitty, will clean them up. Plugs look good, same for wires. Car idles high, IMO, about 1000-1250, but did not experience WOT issue. Think the TPS could cause the stumble, high idle, etc? Thanks.

March 6th, 2011, 01:28 PM	#26
nurkvinny Newbie Join Date: Feb 2011 Posts: 13 iTrader: 0 reviews	New TPS installed just now. Things were 75% better. No idle surges. Was able to goose the pedal right after starting it and it responded tons better. Still some hesitation now though after it ran for a minute or so. Maybe there is a learning period or something like that when you replace the TPS?

March 6th, 2011, 02:32 PM	#27
nurkvinny Newbie Join Date: Feb 2011 Posts: 13 iTrader: 0 reviews	Found the re-learning procedure. Doing it shortly.

March 10th, 2011, 08:07 PM	#30
nurkvinny Newbie Join Date: Feb 2011 Posts: 13 iTrader: 0 reviews	Hasn't surged since. Traded the turbo 5.0 BMW for a beautiful 89 Fox.

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