Warm Start Problems

Reply Subscribe

Thread Tools

Search this Thread

Nov 22, 2016 | 05:03 PM

#16

fordf350man

Thread Starter

Senior User

Joined: May 2015

Posts: 466

Likes: 2

From: Dallas, TX

RLA your the man. Need you to straighten me out.

So KOEO I get 111 and it had nothing in continuous memory.

Did the KOER (yes I took it around the block a few times so engine was warm before starting the test, and again stumbled to get going since was a warm start) threw at me those 3 codes. 411 (which is making me think IAC now) and 538 & 632 which were my fault.

Its raining now or I would be pulling the IAC to clean and test (I still have a link bookmarked on how to do so properly) I did look to be sure the PO did not replace or clean and it looks to be OEM so it probably needs it. That and check for vacuum leaks.

Hoping that fixes this warm start thing. Its dumbfounding that it has no issues when hot or cold but only warm.

Nov 22, 2016 | 05:59 PM

#17

Lead Head

Lead Driver

Joined: Jul 2007

Posts: 7,868

Likes: 9

From: Rhode Island

When it does the no start thing, does it start if you feather the gas?

Nov 22, 2016 | 06:26 PM

#18

fordf350man

Thread Starter

Senior User

Joined: May 2015

Posts: 466

Likes: 2

From: Dallas, TX

Quote:

Originally Posted by Lead Head

When it does the no start thing, does it start if you feather the gas?

yes it does it will slow churn then get going then high idle

Nov 22, 2016 | 10:43 PM

#19

Lead Head

Lead Driver

Joined: Jul 2007

Posts: 7,868

Likes: 9

From: Rhode Island

It could potentially be the IAC valve, it might be stuck.

Nov 22, 2016 | 10:46 PM

#20

fordf350man

Thread Starter

Senior User

Joined: May 2015

Posts: 466

Likes: 2

From: Dallas, TX

We will find out tomorrow hopefully. If weather permits since I am off work this week for Turkey day I am going to pull and test and clean the IAC. Worse case I will mess with it this weekend.

Nov 23, 2016 | 01:18 PM

#21

fordf350man

Thread Starter

Senior User

Joined: May 2015

Posts: 466

Likes: 2

From: Dallas, TX

Quote:

Originally Posted by Lead Head

It could potentially be the IAC valve, it might be stuck.

IAC electrically tested good. Carbon fouled in the valve part so took it apart and cleaned it with carb cleaner. It's doing better for sure already but still having issues and have to feather it just not as much.

May retake it off and clean it real real good since there was still some carbon build up left. Or I may go borrow the one off the F350 since it has a blown head gasket right now. I may just soak the valve part in cleaner overnight its caked on there good. Had the air compressor cranked as high a pressure as it would go.

Followed this write up on how to clean it.

How to Clean and Test your IAC - Ford Bronco Forum

Nov 23, 2016 | 03:27 PM

#22

Lead Head

Lead Driver

Joined: Jul 2007

Posts: 7,868

Likes: 9

From: Rhode Island

I've never really had much luck with cleaning IAC valves - just replacing them.

Nov 23, 2016 | 03:46 PM

#23

fordf350man

Thread Starter

Senior User

Joined: May 2015

Posts: 466

Likes: 2

From: Dallas, TX

Quote:

Originally Posted by Lead Head

I've never really had much luck with cleaning IAC valves - just replacing them.

I am already ahead of you. I ordered a motorcraft IAC off amazon was $58 shipped with tax about an hour ago. I got this bronco running pretty good outside of this warm start issue. Still a few things to do on the drivetrain such as drop the tranny pan and install this 4R70W tranny pan and filter I bought as well as add the external tranny cooler and filter kit I have ready to put on.

Considering my F350 is dead at the moment with a blown head gasket, this other bronco I just bought needs a tune up and suspension gone through. This truck is my baby at the moment. Been putting more miles on it than my 2012 F150 as of the last month or so.