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Unread 05-26-2011, 06:50 AM   #1
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1988 YJ Wrangler 
Join Date: Feb 2011
Location: Cary, NC
Posts: 232
Testing TPS, IAC, MAP

Hey everyone. I am having a slight problem with my ZJ. It seems to sometimes have a hard time finding idle speed after coming down from a higher rpm, for instance letting of the gas to decelerate or after revving in neutral. When it comes down to idle it goes to a too low of an rpm and takes a second to find idle speed. Sometimes it stalls out completely. I'm pretty sure its not a vacuum leak and I tested fuel system pressure just to cover my bases and its spot on at 49 PSI.

Does anyone know the proper procedure to check TPS, IAC, MAP sensors with a multimeter to see if the are bad or going bad. My service manual is pretty vague.

Also CEL will not illuminate on start up (good bulb i checked) but there are no codes anyway. Just another problem.

Thanks for the help. Any other ideas are welcome!

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