91 Ford Ranger trouble, HELP PLEASE!!!!

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  #1  
Old 01-21-10, 11:19 AM
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91 Ford Ranger trouble, HELP PLEASE!!!!

Hello,

I have a 91 Ford Ranger that is idling rough at times and the gas mileage is getting bad. It is a 2.3 Lr. 4 cyl. When it is idling rough the check engine light comes on and then goes off when it starts idle good again. Like I said the rough idle comes and goes. I pulled the OBD 1 trouble codes by using the check engine/MIL procedure and got codes 18 and 88. Any help would be greatly appreciated.

Danny
 
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Old 01-21-10, 12:42 PM
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DOn't know if you found the code list...so here ya go...FORD 1983-1995 OBD1 Decoder

Looks like 18 could be part of the issue....no Pro here though. Now if it was a '67 Pontiac...

Does the rough idle occur anytime? Or just when its cold out..or wet out..etc?
 
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Old 01-21-10, 03:41 PM
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Thanks gunguy45,

The rough idle kinda comes and goes but pretty frequent. No particular time when it does. If code 18 is "Ignition diagnostic monitor (IDM) circuit failure", what does this mean and what can I change/replace to fix it? Anyone know? Any help greatly appreciated.

Thanks,
Danny
 
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