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  Mustangsandmore Forum Archive
  '79 to '93 -- The Fox Mustang
  rough idle

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Author Topic:   rough idle
mnballard
Gearhead

Posts: 136
From: Kannapolis, NC, USA
Registered: Sep 2005

posted 09-29-2005 12:38 AM     Click Here to See the Profile for mnballard        Reply w/Quote
i have a 93 lx with a 2.3 4 banger and in the last couple of days its been idling rough ive checked the pvc valve and it has a good vacuum on it does anyone else have any ideas? oh yeah what is the best spark plug to run in this motor at this moment i have a set of splitfire plugs in it.

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"If you really want something in this life, you have to work for it. Now, quiet! They're about to announce the lottery numbers..."
- Homer Simpson

ddenton749
unregistered
posted 09-29-2005 08:27 AM              Reply w/Quote
I would check for:

(0) Any trouble codes? Are you getting a CEL?

(1) A vacuum leak somewhere. O2 sensor lean/rich trouble code?

(2) Idle Air Control Valve (IACV). Does it have a high idle when the engine is first sarted cold?

------------------
'73 Convertible, 351C 2V
'91 LX Convertible 5.0
Member: Valley Forge Mustang Club
"The best things in life are free, but the really kick-a** things cost a fortune."
My Site

mnballard
Gearhead

Posts: 136
From: Kannapolis, NC, USA
Registered: Sep 2005

posted 09-29-2005 12:42 PM     Click Here to See the Profile for mnballard        Reply w/Quote
Im not getting any trouble codes.

I don't hear any vacuum leaks but there might be, and it does have a high idle till it warms up just like normal

It's not a real rough idle probleme, as I've just noticed a difference in how it is idling.
and also my fuel milage as decreased a little from 30mpg to about 25mpg its taking a lot more gas to get it motivated

[This message has been edited by mnballard (edited 09-29-2005).]

[This message has been edited by mnballard (edited 09-29-2005).]

ddenton749
unregistered
posted 09-29-2005 02:01 PM              Reply w/Quote
Check for a vacuum leak. Also, when was the last time you did a complete tune up?

How many miles are on the car?

------------------
'73 Convertible, 351C 2V
'91 LX Convertible 5.0
Member: Valley Forge Mustang Club
"The best things in life are free, but the really kick-a** things cost a fortune."
My Site

mnballard
Gearhead

Posts: 136
From: Kannapolis, NC, USA
Registered: Sep 2005

posted 09-29-2005 02:31 PM     Click Here to See the Profile for mnballard        Reply w/Quote
did plugs and wires in febuary of this year. the car has 173000 but the motor was rebuilt at 140000 so the motor only has 33000 miles right now i replaced the tranny in march. tranny has about 3500 milkes on it since it was rebuilt

[This message has been edited by mnballard (edited 09-29-2005).]

TurboGT
Gearhead

Posts: 318
From: Hutchinson, Kansas
Registered: Mar 2002

posted 09-29-2005 02:57 PM     Click Here to See the Profile for TurboGT        Reply w/Quote
quote:
oh yeah what is the best spark plug to run in this motor at this moment i have a set of splitfire plugs in it.

Autolite 764 gapped .035-.040 with stock ignition.

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Mark Walton '83 Mustang GT 2.3 Turbo NHRA SS/O
'69 "off brand" NHRA SS/EA

[This message has been edited by TurboGT (edited 09-29-2005).]

mnballard
Gearhead

Posts: 136
From: Kannapolis, NC, USA
Registered: Sep 2005

posted 09-29-2005 03:05 PM     Click Here to See the Profile for mnballard        Reply w/Quote
ok ill give the autolits a try and see if that helps

Fastback1
Journeyman

Posts: 99
From: Laplata, Maryland, USA
Registered: Oct 2005

posted 10-04-2005 08:59 PM     Click Here to See the Profile for Fastback1        Reply w/Quote
I work on my friends cars and stuff but those brand name popular "performance" plugs and stuff are crap they are getting your money thats probally the problem or you mass airflow might be going bad and i dont know but you might have one of the plug wires backwards Change the fuel filter to that always helps

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