Emissions Woes

Jinx

I like cats, cats like me. Cats and I fully agree.
Dirt-Old 20+Year Member
Oct 2, 2003
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y'all have been so helpful with my 4.6 questions and the 2.3 forum is almost inactive, so can anyone here help me with my '94 2.3L problem?

I'll try to keep it short, but I want to give you all the info.

2 months ago: Replaced DHCP sensor, EGR valve, EGR solenoid & ran code reader KOEO, KOER and CM codes all came up 111 or 10. (Thanks for everyones help )

Yesterday: Wife driving home and engine overheated. I added coolant which solved the overheat problem. Engine started running rough so I pulled the codes and this is what came up

CM = 211 profile ignition pickup circuit fail
KOEO = 111
KOER = 172 HEGO senor fault/lean
332 insufficient EGR flow detected

I reset the computer without fixing anything, drove it around and pulled the codes again and this is what I got:

CM = 10 (all clear)
KOEO = 111
KOER = 332 insufficient EGR flow detected
411 cannot control RPM during KOER low RPM check.

My questions are:
1. Could the engine overheat have caused the codes and could it have cause a malfunction/failure of any of the parts I replaced?

2. Could a clogged cat cause the EGR problems that the code reader is pulling?

By the way I can't find any coolant leak and I'm not burning it. Flushed the system 2 years ago. So where is it going?
 
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