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95 caravan stumbles and dies

3106 Views 18 Replies 5 Participants Last post by  ka9yhd
I just got my close friend a 95 caravan from a friend at church she lives in NC I'm in sc, anyway she had discovered last week that it would stumble and die sometimes at idle sometimes while driving long distance (hr long or so) it has a mild skip and kinda rough idle, it throws the codes 12,21,23, during the long runs light stays on, I have read the o2 sensor can kill the engine if bad, that I'd a first for me hearing that, based on the info I have and codes I have does anybody have a similar situation and solutions? A direction I can go in without Throwing parts at it anyet information that can help me help her is greatly appreciated :)
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What engine? What mileage on the van? How long since the last tune up?

A bad O2 sensor can kill any engine - running too rich dilutes the oil with unburned gasoline which can damage the engine.
I agree about when was the last tune up? Also has the throttle body ever been cleaned?
I just looked through the service manual for my 92 Grand Voyager and I do not see a code 23 listed.
12 is something about battery being disconnected and 55 is end of message.

If it has factory ignition wires then you will see a date code on them, such as 1-14 which is for the wires I recently purchased at the dealer.

As for the throttle body make sure you clean out the bore and edges of the throttle plate with an old tooth brush and throttle body cleaner, then hose out the bypass port for the AIS valve, and any vacuum passages.
IC just a note on the under hood labels. I have seen them with wrong gap listed and on my 92 Grand Voyager with the 3.3 Liter the under hood label calls for RN16 plugs but the Champion book shows RN14.
There are two vacuum hoses on top of the throttle body, remove the hoses and spray the throttle body cleaner in the nipples.
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