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Unread 04-02-2005, 04:19 PM   #1
Rich in Almaden
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Join Date: Apr 2003
Location: Almaden Valley, CA (So. SF Bay area)
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'89 Wrangler 2.5L - High idle after warm - Help?

Thanks in advance to anyone with advice. My brother has an '89 2.5L with about 150k miles. When starting cold, engine runs rough at around 700 rpm, but as it warms up, it smooths out, but is running 1500 rpm.

He's also seen an increase in fuel consumption from ~20 mpg to 15 mpg. The plugs are new and properly gapped, but he still needs to replace the distributer cap and ignition wires.

Anyone have anything else he should be checking? He lives in Hawaii and parts are very expensive - so just swapping out parts is not a cheap thing to do. Also, the dealer won't work on his vehicle any more as they say it's too old.

Thanks for your help.

Rich

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Unread 04-02-2005, 08:19 PM   #2
ast90YJ
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Location: Massachusetts
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I got the same problem...It should be going into the shop soon to get fixed cayse u can.t figure it out. Im pretty sure it has to do with the computer but we'll see wha the mechanic says
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Unread 04-03-2005, 06:45 AM   #3
Jeepsohigh
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I have an 89 2.5 and was having the same problem. it turned out to be the coolent sensor. it is a sensor that goes in the intake that tells the computer how rich/lean to run depending on the temp.

hope that helps
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Unread 04-03-2005, 02:38 PM   #4
Rich in Almaden
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Location: Almaden Valley, CA (So. SF Bay area)
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Thanks Jeepsohigh - do you recall if it was called the MAT sensor (Manifold Air Temp)?

Thanks again for your thoughts.

Rich
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Unread 04-04-2005, 03:10 PM   #5
Rich in Almaden
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Join Date: Apr 2003
Location: Almaden Valley, CA (So. SF Bay area)
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From what I've found the MAT sensor should read less than 1000 ohms when the engine is warm. It seems like I'm getting the correct reading ~700 ohms.

Any other ideas?

Thanks,

Rich
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