94 5.2 code 21, and 27won't stay running - JeepForum.com
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Unread 01-10-2015, 03:14 PM   #1
Jridgley
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Join Date: Dec 2014
Location: show low, az
Posts: 34
94 5.2 code 21, and 27won't stay running

Hello all, I'm having problems. My engine starts fine, then will die about after 30 seconds. About a day ago my problem originated with it dropping rpms at lower speeds, now today it will drop rpms and die in drive or in any gear. I cleaned the iac and didn't really do anything m I'm getting codes 21,and 27. I've cleaned all of my injectors and no luck. What's going on!

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Unread 01-10-2015, 03:38 PM   #2
Jridgley
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Join Date: Dec 2014
Location: show low, az
Posts: 34
So, now it's only doing it in gear, it'll drop from 3000 all the way to idle. I just had a transmission rebuild. Could this be the torque converter
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Unread 01-10-2015, 08:49 PM   #3
6x-gpapa
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1993 ZJ 
 
Join Date: May 2013
Location: L.A./St.George, UT/CA
Posts: 8
According to the manual-T/C 21 is "problem with O2 sensor circuit, sensor voltage to computer not fluctuating." T/C 27 is "one of the injector control circuit output drivers does not respond properly to the control signal. Check the circuits." What spark plugs are you running? Use Champion RC12YC w/.035" gap.
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