Runs rough below 3k or so..

alabamastanger · July 8th, 2007, 09:29 PM

My 91 5.0 runs rough when it's below 3k RPM or so. It kinda acts like I'm trying to go 10-15MPH in 3rd gear or something, but when I open it up it runs fine. Could it be the O2 sensors>?

ThrashN · July 8th, 2007, 10:03 PM

I would check your IAC and clean the MAF

89LX347 · July 9th, 2007, 12:51 AM

your exactly right its your O2 sensors ...when you change those it will clean that problem right up spray about a half of gallon of WD40 the night before and spray it throughout the change ..i had the exact problem...and the reason that it runs fine a WOT is cause they are not in use at that time

TENGRAM · July 9th, 2007, 02:01 AM

might want to actually make sure its the o2 sensors. they're kinda expensive to replace just on a hunch. lots of things can cause the problem you're describing. Check for Codes

July 8th, 2007, 09:29 PM	#1
alabamastanger Regular 1983 Mustang GT N/A Join Date: Feb 2007 Location: Tucson, Az Posts: 121 iTrader: 0 reviews	Runs rough below 3k or so.. My 91 5.0 runs rough when it's below 3k RPM or so. It kinda acts like I'm trying to go 10-15MPH in 3rd gear or something, but when I open it up it runs fine. Could it be the O2 sensors>?

July 9th, 2007, 12:51 AM	#3
89LX347 Hardcore Enthusiast Join Date: Apr 2007 Posts: 1,304 iTrader: 0 reviews	your exactly right its your O2 sensors ...when you change those it will clean that problem right up spray about a half of gallon of WD40 the night before and spray it throughout the change ..i had the exact problem...and the reason that it runs fine a WOT is cause they are not in use at that time __________________ I believe in art when it is not seen. I believe in music when it is not audible. I believe in God when He is silent.

July 9th, 2007, 02:01 AM	#4
TENGRAM Hardcore Enthusiast Join Date: Jun 2006 Posts: 1,027 iTrader: 0 reviews	might want to actually make sure its the o2 sensors. they're kinda expensive to replace just on a hunch. lots of things can cause the problem you're describing. Check for Codes __________________ 89 GT t5 3.73 www.my5oh.com/

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July 8th, 2007, 10:03 PM	#2
ThrashN Regular 91 LX 5.0 11.87 Join Date: Jul 2007 Location: Waynesboro, PA Posts: 99 iTrader: 0 reviews	I would check your IAC and clean the MAF

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