94 z28 running rough when warmed up
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Registered User
Joined: Oct 2009
Posts: 31
From: south jersey
94 z28 running rough when warmed up
My 94 camaro was idling rough and was missing when I accelerate it.I already
replaced the fuel filter and ran fuel injection cleaner through it and the air filter is fine.Then I disconnected the right o2 sensor now it idles smooth and accelerates great but after ten minutes of driving I am getting the ses light on and light on the accelerating and braking around town about 8 to 9 mpg for gas mileage.Could it be the left o2 sensor and or the maf sensor?.Somebody said autozone in the forum could it read that it would pick up two different codes if it is that?
replaced the fuel filter and ran fuel injection cleaner through it and the air filter is fine.Then I disconnected the right o2 sensor now it idles smooth and accelerates great but after ten minutes of driving I am getting the ses light on and light on the accelerating and braking around town about 8 to 9 mpg for gas mileage.Could it be the left o2 sensor and or the maf sensor?.Somebody said autozone in the forum could it read that it would pick up two different codes if it is that?
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Joined: Nov 1998
Posts: 71,098
From: Hell was full so they sent me to NJ
You'll get the SES light and at least one code for the disconnected O2 sensor. Did you have an SES light BEFORE you disconnected the sensor?
Reconnect the sensor, pull the "PCM BAT" fuse in the end of dash panel for 30 seconds to clear the codes. Drive it normally until the SES light comes back on. Find someone with an OBD-I scanner to pull the code(s). Usually shops like AutoZone can only scan OBD-II (96 and up) PCM's, so they might not be able to help you.
If you have a laptop, you can get a cable and free scanning software that will allow you to read the codes, and run a data log of the sensors and PCM parameters as you drive. Often, the data log will point you in the right direction. If interested, I'll post the links for the cable and free software.
Reconnect the sensor, pull the "PCM BAT" fuse in the end of dash panel for 30 seconds to clear the codes. Drive it normally until the SES light comes back on. Find someone with an OBD-I scanner to pull the code(s). Usually shops like AutoZone can only scan OBD-II (96 and up) PCM's, so they might not be able to help you.
If you have a laptop, you can get a cable and free scanning software that will allow you to read the codes, and run a data log of the sensors and PCM parameters as you drive. Often, the data log will point you in the right direction. If interested, I'll post the links for the cable and free software.
Thread Starter
Registered User
Joined: Oct 2009
Posts: 31
From: south jersey
running rough
Yes I was getting the ses light after the same amount of time with o2 sensor connected.It seem to clear up the problem of running rough after disconnecting the o2 sensor.Yes I would be interested in the cable and the software for the laptop to scan the sensors.I will definitly give it a try.I appreciate the info.
Administrator
Joined: Nov 1998
Posts: 71,098
From: Hell was full so they sent me to NJ
You can also use a "real" OBD-I scanner, like the one make by Auto Xray. Just don't try the $30 Actron "code scanner", because that just shorts the pins in the ALDL connector to flash the codes on the SES light, but 93 was the last year that would work.
FreeScan - "free"
http://www.andywhittaker.com/ECU/Fre...0/Default.aspx
TTS DataMaster - free download, 20 free uses
http://www.ttspowersystems.com/DataMaster.html
Cable:
http://www.akmcables.com/
Data interpretation:
http://www.injuneer.com/ScanMast.html
FreeScan - "free"
http://www.andywhittaker.com/ECU/Fre...0/Default.aspx
TTS DataMaster - free download, 20 free uses
http://www.ttspowersystems.com/DataMaster.html
Cable:
http://www.akmcables.com/
Data interpretation:
http://www.injuneer.com/ScanMast.html
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