Code 71 and 28 in FZJ80 1994

[sallarneverdies]

Hello, I've got code 71 and 28 in 1994 FZJ80/FJ80. I have replaced all the hoses of EGR system already but I would like to know if I should go ahead and replace EGR Valve, EGR Vacuum Modulator, or ECM for code 71.

My car has an idle problem. The idle goes down to 400 or less when the car is running in drive and brake applied. If I shift it to N, It will be higher but not close to 650. If I turn my AC on, it will go to 700 or more. The RPM won't be stable and changes constantly.

Can someone help me fixing this issue with not spending so much money on different parts.

Thanks

 

[ryanrtxtx]

Hello, I've got code 71 and 28 in 1994 FZJ80/FJ80. I have replaced all the hoses of EGR system already but I would like to know if I should go ahead and replace EGR Valve, EGR Vacuum Modulator, or ECM for code 71.

My car has an idle problem. The idle goes down to 400 or less when the car is running in drive and brake applied. If I shift it to N, It will be higher but not close to 650. If I turn my AC on, it will go to 700 or more. The RPM won't be stable and changes constantly.

Can someone help me fixing this issue with not spending so much money on different parts.

Thanks

Having same issue on my 94. Hoping to see some answers here.

 

[suadero]

28 is o2 sensors, no? Just did mine and previously I was occasionally having unstable idle, and had a CEL for a couple days with code 28. Haven't given the new sensors a full shakedown yet but so far it seems good. Unfortunately sensors for the '94 aren't cheap ($200) or easy to install (rusted nuts are a pain in the butts).

 

[half k cruiser]

When my wife's starting acting up I did the following. Bypassed the EGR so I wouldn't have to deal with it. Its a crap system anyways and there is no noticeable decrease in performance or anything else by getting rid of it. I then replaced the worn out o2 sensors with OEM at almost $200. Its worth it though to only buy them once. Aftermarket sensors are notorious for not working in the earlier generation trucks. Rather than trying to deal with rusted nuts and bolts on the old sensors I simply deleted the PAIR system and moved the sensors up there. This gets rid of another nonsense emissions system and keeps your expensive new sensors from hitting rocks or getting moisture intrusion on the connections. 3 years and probably 60-70k miles later and no codes yet.

 

[MoJ]

Code 71