code 4 ?!?!?!?!?!?!

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Nov 23, 2005 | 05:53 AM

motorcitybronco

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Joined: Jan 2003

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From: hockeytown

code 4 ?!?!?!?!?!?!

here is a new one. 94 bronco 302 e40d 4 wheel abs. after the thuck sits for a while (hot outside or cold outside) truck will idle high for a few seconds around 1500 rpmsthen it drops below 500 rpms shoots back up and the check engine light will flash 4 times. any ideas on what this is. i hooked up a matco determinator scanner and came back with a code 11 all good..
thanks

Nov 23, 2005 | 08:00 AM

muckypaws

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From: Derbyshire, UK.

what happens after this? does it idle high all the time?

Maybe start checking the IAC controller on the throttle body - is it stuck open thus causing a high idle speed?

When you scanned it was the KOEO or KOER?

Nov 23, 2005 | 08:52 PM

motorcitybronco

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From: hockeytown

it idles perfect after a min or so scanned both ways.

Nov 24, 2005 | 07:03 AM

muckypaws

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From: Derbyshire, UK.

hmm wierd one! not sure what to suggest next... Might need input from Greystreak92 for this one.

Nov 24, 2005 | 10:00 AM

Black Ford XLT

Fleet Mechanic

Joined: Aug 2002

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From: Swansea SC

Have seen many a posts about throttle bodies being dirty. Not that this is your problem but an area to look at TR

Nov 24, 2005 | 10:45 AM

tigerhawk_212

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Joined: Sep 2003

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From: North Carolina

You may want to check your iac and tps with a multimeter and/or check something else you think may be causing this.

Nov 25, 2005 | 09:20 PM

autx790

Senior User

Joined: Oct 2005

Posts: 125

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From: South Carolina

This may not be what you mean, but when you first turn the engine on I get a 4 as well, which i was told means it found a V8 engine, 3 for V6 etc. then it will rev the engine a minute or so then start out putting your codes.

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Nov 27, 2005 | 11:23 PM

greystreak92

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Joined: Sep 2002

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From: Gateway to the West

It also means that somehow the EEC computer believes that it is being put through the KOEO test every time you start it. Thats a problem. I'd check the test connector and the wiring harness to it. The KOEO test can be administered by simply jumping the correct pair of terminals in the EEC test connector together. It may be that somehow these two terminals or the wires to them have shorted. Otherwise I am unaware of any reason why the light would flash at all during normal operation in other words without the EEC test terminals jumped together).