89 Ford Aerostar Rough Idle - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars
Ford Vans and Mini Vans | Ford Aerostar | Ford Freestar | Ford Galaxy | Ford Windstar Forum for discussion of all Ford Vans and Ford Mini Vans such as the Ford Aerostar and Ford Freestar.

Reply
 
LinkBack Thread Tools Display Modes
post #1 of 17 (permalink) Old 03-23-04, 08:29 PM Thread Starter
Registered User
 
Join Date: Nov 2003
Posts: 9
89 Ford Aerostar Rough Idle

We have an 89 Ford Aerostar. It runs great other than it idles rough all the time. We've replaced the fuel filter. When I do a computer test on it, I get codes 22, 12 and 11. Can anyone tell me what those codes are and what they mean?

Thank you

Jaime

Last edited by Jaime; 03-23-04 at 08:31 PM. Reason: Wanted e-mail notification
Jaime is offline  
Sponsored Links
Advertisement
 
post #2 of 17 (permalink) Old 03-23-04, 08:55 PM
Registered User
 
'92BigBronco's Avatar
 
Join Date: Aug 2003
Posts: 340
Re: 89 Ford Aerostar Rough Idle

It's most likely the IAC (idle air control) valve. It controls the amount of air entering the engine at idle and does get gummed up after a while. You can pull it off and clean it with carb cleaner or just replace it. Should take care of the problem.

1992 Ford Bronco
351W
E4OD- B&M Stage 2 shift kit
Full 3" stainless Bassani Exhaust
32" BFG's/stock suspension

"No replacement for displacement."

"Our lugnuts require more torque than most Honda's produce!"
'92BigBronco is offline  
post #3 of 17 (permalink) Old 03-23-04, 09:17 PM
***** Idiot....
 
LunaticSVT's Avatar
 
Join Date: Feb 2001
Location: The Sticks of Central TX
Posts: 10,560
Re: 89 Ford Aerostar Rough Idle

If I recall the codes should mean the following

22: MAP (Manifold Absolute Pressure, for speed-density cars) or BP (Barometric Pressure, for mass-air cars) sensor signal out of range. Suspect MAP or BP sensor and harness.

12: PCM could not increase idle speed above normal idle during KOER high RPM idle check. Suspect throttle body coking.

11: No problems found

With the 22 you should get the check engine light on. I would first look at the IAC first and check MAP sensor for damage also look at the TB for any carbon build up.
LunaticSVT is offline  
post #4 of 17 (permalink) Old 03-24-04, 08:51 AM Thread Starter
Registered User
 
Join Date: Nov 2003
Posts: 9
Re: 89 Ford Aerostar Rough Idle

Could you tell me where the IAC is on our 89 Ford Aerostar? I would like to check that before we do anything. Thank you for your response 92 BigBronco and thank you for yours LunaticSVT. I found the codes online and that's what they both said. The check engine light is not coming on in the van at all.

Jaime
Jaime is offline  
post #5 of 17 (permalink) Old 03-24-04, 11:21 AM
***** Idiot....
 
LunaticSVT's Avatar
 
Join Date: Feb 2001
Location: The Sticks of Central TX
Posts: 10,560
Re: 89 Ford Aerostar Rough Idle

Quote:
Originally Posted by Jaime
Could you tell me where the IAC is on our 89 Ford Aerostar? I would like to check that before we do anything. Thank you for your response 92 BigBronco and thank you for yours LunaticSVT. I found the codes online and that's what they both said. The check engine light is not coming on in the van at all.

Jaime

The Idle Air Control Valve is a solenoid valve mounted on the throttle body. The IAC valve enables air to bypass the throttle plate to trim the idle speed to suit the various
engine loading requirements.

I have attached a picture of one from an I6. But you should be able to determine from the looks of it to locate yours.

Last edited by LunaticSVT; 11-24-06 at 08:22 PM.
LunaticSVT is offline  
post #6 of 17 (permalink) Old 03-24-04, 09:00 PM Thread Starter
Registered User
 
Join Date: Nov 2003
Posts: 9
Re: 89 Ford Aerostar Rough Idle

Thanks for your reply and picture attached LunaticSVT. We found the IAC. Haven't taken it off yet and cleaned it though, will do that very soon.

Jaime
Jaime is offline  
post #7 of 17 (permalink) Old 03-25-04, 09:21 PM Thread Starter
Registered User
 
Join Date: Nov 2003
Posts: 9
Re: 89 Ford Aerostar Rough Idle

We took the plug out of the IAC and the van started idling alot worse and died, then we took the IAC off and cleaned it, put it back on and it didn't make a difference. We then pulled the plug out of it again and it idled the same as it did with the plug in. Is this normal? Is there a computer code if the IAC is bad?

Thank you!

Jaime
Jaime is offline  
post #8 of 17 (permalink) Old 03-27-04, 08:21 PM
Registered User
 
Join Date: Mar 2004
Posts: 4
Re: 89 Ford Aerostar Rough Idle

jamie
IAC if you unplug it ,it should make a difference of rpm from one way to the other.If it dont I would guess it not to be working.
yendor is offline  
post #9 of 17 (permalink) Old 03-28-04, 05:02 PM Thread Starter
Registered User
 
Join Date: Nov 2003
Posts: 9
Re: 89 Ford Aerostar Rough Idle

Yendor,

We found out our Aerostar has a blown head gasket, luckily my boyfriend knows alot about engines. He is tearing down the engine now and is going to replace both head gaskets and the other gaskets. I just hope that's all that's wrong with it.

Thank all of you for all your suggestions and advice, I will update you on how the van is running after the gaskets are replaced.

Jaime
Jaime is offline  
post #10 of 17 (permalink) Old 03-28-04, 07:01 PM
***** Idiot....
 
LunaticSVT's Avatar
 
Join Date: Feb 2001
Location: The Sticks of Central TX
Posts: 10,560
Re: 89 Ford Aerostar Rough Idle

is this one the of the 3L V6? If so they are notorious for this.

if he is replacing the gaskets make sure that he uses the new bolts as they have recommended in the TSB.


Also, I apologise that I did not respond sooner. I seem to have missed your response earlier..
LunaticSVT is offline  
Sponsored Links
Advertisement
 
Reply

  Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars > Ford Trucks | Utes | Vans |SUVs | Crossovers > Ford Vans and Mini Vans | Ford Aerostar | Ford Freestar | Ford Galaxy | Ford Windstar
Gear in this thread - Powered by O'Reilly Auto Parts


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
AUS: 1901 Ford Sweepstakes - Sydney motor Show RPO83 Ford Worldwide News 0 10-15-03 06:57 PM
Ford family celebrates 100 years of cars Stacy94PGT Ford Worldwide News 0 06-10-03 06:46 AM
FORD TOUGH: The pressure's on for Bill Ford Jr. to finish first Stacy94PGT Ford Worldwide News 0 06-10-03 05:52 AM
'Henry had the dream' Stacy94PGT Ford Worldwide News 0 03-28-03 06:58 AM
A CENTURY OF VISION: Fords built city, changed the world Stacy94PGT Ford Worldwide News 0 03-12-03 08:17 AM

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome