93 silverado hesitates and looses power

flbchdawg · 06-20-2008, 05:58 AM

I have a 93 silverado 5 speed with a 4.3 liter engine. It started hesitating and developed a spuratic idle. I changed plugs, wires, rotor and cap and it still runs poorly. It started setting a code 45, which is rich exhaust. Have checked the things the Haynes manual called for and no improvement. What am I missing and where do I go next.

**Midnight Tech** · 06-21-2008, 01:01 PM

Is it going into closed loop mode?

flbchdawg · 06-23-2008, 06:40 PM

not sure what u mean by closed loop mode? Have recently also rebuilt (about an hour ago) the throttle body and cleaned the Air control module and still no change..

Whitetail Crazy · 06-24-2008, 06:05 AM

Sounds like O2 sensor.

06-20-2008, 05:58 AM	#1 (permalink)
flbchdawg Registered User Join Date: Jun 2008 Posts: 2 OS: windows vista	93 silverado hesitates and looses power I have a 93 silverado 5 speed with a 4.3 liter engine. It started hesitating and developed a spuratic idle. I changed plugs, wires, rotor and cap and it still runs poorly. It started setting a code 45, which is rich exhaust. Have checked the things the Haynes manual called for and no improvement. What am I missing and where do I go next.

06-21-2008, 01:01 PM	#2 (permalink)
Midnight Tech Admin/Head GreaseMonkey/Igor's alter ego/Grand Exalted PoohBah Join Date: Dec 2001 Location: SC Posts: 2,599 OS: Windows XP SP2/Windows 98SE/Fedora Core 6/RH 7.2 with Autopoint	Re: 93 silverado hesitates and looses power Is it going into closed loop mode? __________________ If you know anyone who graduated from North Myrtle Beach (SC) High in 1988, please contact MT for reunion information. Sharing my life...with my Imzadi! Interested in Trek gaming? Check out the Dynaverse! Proud supporter of the Carolinas Aviation Museum. If we have helped you in any way, please donate to keep TSF up and running!

06-23-2008, 06:40 PM	#3 (permalink)
flbchdawg Registered User Join Date: Jun 2008 Posts: 2 OS: windows vista	Re: 93 silverado hesitates and looses power not sure what u mean by closed loop mode? Have recently also rebuilt (about an hour ago) the throttle body and cleaned the Air control module and still no change..

06-24-2008, 06:05 AM	#4 (permalink)
Whitetail Crazy Registered User Join Date: Apr 2008 Location: Illinois Posts: 29 OS: windows xp	Re: 93 silverado hesitates and looses power Sounds like O2 sensor.