EFI idle to high

[beaux312]

So I took off my upper intake so I could paint it and tap the vac ports that I didnt need so I could put some bolts in them. Didnt want them to leak anymore. While I had it off I cleaned the upper and lower intakes and IAC with carb cleaner. Now that I have it back togeather its idling at around 850RPMs. Did I mess up the IAC with the carb cleaner?

 

[browngr5]

So I took off my upper intake so I could paint it and tap the vac ports that I didnt need so I could put some bolts in them. Didnt want them to leak anymore. While I had it off I cleaned the upper and lower intakes and IAC with carb cleaner. Now that I have it back togeather its idling at around 850RPMs. Did I mess up the IAC with the carb cleaner?

Make sure you don't have a vacuum, intake leak. If you check for leaks with carb cleaner be careful it melts fresh paint. After that, you could set the idle by following steps found on this forum. I'll try to find the post.

 

[browngr5]

So I took off my upper intake so I could paint it and tap the vac ports that I didnt need so I could put some bolts in them. Didnt want them to leak anymore. While I had it off I cleaned the upper and lower intakes and IAC with carb cleaner. Now that I have it back togeather its idling at around 850RPMs. Did I mess up the IAC with the carb cleaner?

If the idle is low and the TPS is high lots of problems will appear. If you need to grossly modify the TPS mounting holes to adjust Closed Throttle between 0.6-1.0 volts, you should recheck the idle stop screw first. http://www.fordfuelinjection.com/?p=30

Resetting the base idle:

Clear the computer's idle memory by disconnecting the battery for 20+ minutes.

-Disconnect the Idle Air Bypass solenoid -Reconnect battery -Start engine and set idle speed to desired RPM with idle screw on throttle body -Turn off engine and reconnect the air bypass solenoid -Set TPS voltage between 0.90 - 0.95 volts with a digital volt meter -Start engine and let it idle for 2 minutes with no accessories on. -Turn off engine for two minutes -Start engine again and run.

http://www.moddedmustangs.com/forums...dle-reset.html

 

[jw0747]

go here and go through all 5 parts. if your battery was disconnected for a period of time you need to reset your ecm. part 3 -resetting your base idle. 850 rpms not too far off.

http://www.muscularmustangs.com/iac.php

 

[beaux312]

Now I did add a throdlle body spacer and a 1/2 phanolic intake spacer. The battery was disconnected for a couple days. It idled and ran fine before.

 

[Viperwolf1]

Sounds like a vac leak to me. Spray some cleaner around everything until you find it.

 

[broncoitis]

go here and go through all 5 parts. if your battery was disconnected for a period of time you need to reset your ecm. part 3 -resetting your base idle. 850 rpms not too far off.

http://www.muscularmustangs.com/iac.php

jw0747,

Nice reference article. My truck Idles a bit high as well so I will be following those steps as well to try and get it a bit lower.

I thought the engine won't run with the IAB disconnected? %)

 

[beaux312]

very nice, lots of info. I will check for vac leaks this afternoon and go from there

 

[blazinchuck]

any details on "what looks like a remote power steering reservoir?

 

[beaux312]

any details on "what looks like a remote power steering reservoir?

05 F250 and bracket, had to flattin out the back part of the bracket to mount flush on the firewall. I think I got about $60 in both from the dealership. It has duel returns too.

 

[mattt]

What is the stock spec for idle with Mustang MAF system? Mine idles around 850rpm as well.

 

[beaux312]

Well no vac leaks and the TPS volts is .095s so Im going to reset the idle and see what happens.

 

[beaux312]

What is the stock spec for idle with Mustang MAF system? Mine idles around 850rpm as well.

Im shooting for 550-700.

 

[Viperwolf1]

I think there's some junk in the IAC holding the valve open slightly (technically a vac leak). It's difficult to clean them out good. I wouldn't adjust the idle stop until you verify the IAC is clean.

 

[beaux312]

Ok should I use carb cleaner to clean it? I know it might not make a differance but the IAC is less than a year old.

 

[Viperwolf1]

Carb cleaner is fine. I use brake cleaner. Get a pipe cleaner or something that you can run between the valve and seat.