93 mercury topaz.high idle problem


Old 08-26-04, 11:12 AM
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93 mercury topaz.high idle problem

93 Mercury Topaz Sedan. automatic transmission...2.3 liter engine...80,000miles..
service engine light is on,don't know how long it has been on because the original owner has passed away....car starts up an idles extremely high and does not go down to a normal idle...can you help me?.....

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Old 08-26-04, 05:20 PM
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The first thing you need to do is have the codes read and report back here with the code numbers. If your near an AutoZone, they will read them for free but remember, they are parts people and not techs so don't let them diagnose or sell you anything. Just give us the exact code numbers and you'll get additional advice.
Old 08-27-04, 07:12 AM
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to old

auto zone does not do codes for that car,,,only 96 and newer
Old 08-31-04, 04:17 AM
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got codes

Old 08-31-04, 05:43 AM
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form what Ive read 157 and 158 has to do with mass air flow circuit and 327 is egr pressure feedback signal low.
dont really think that any of those codes would be related to your high idle and I would expect that the idle air control motor is stuck open causing the high idle.
check for any broken or leaking vacum lines ?
after starting engine you could disconnect the iac motor connector to see if idle drops if no change unbolt iac motor and block off iac passages and try startiing vehicle if it now idles very low or will not stay idling and dies the iac motor is bad.
the pfe sensor is located in a bracket that is mounted to the firewall is square shaped plastic box that has a hose running from it to the egr valve exhaust tube make sure the hose is still connected and not broken or burnt up if the hose is bad replace it with another high temp rated hose, pfe failure is common on this model will cause check engine light but will not cause your high idle.
after checking the above things I would suggest clearing the codes by disconnecting the battery and driving the vehicle to see what trouble codes return. mainly to see if codes 157 and 158 return.
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