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Ask Your Question1997 Ford Expedition
Question: engine runs rough at 1500 rpm.
Question
when you idle the engine at 1500 rpm the idle goes up and down. when you drive at 1500 rpm the engine stumbles and misses, with a dead spot. i have replaced the following- EGR valve,EGR pressure sensor,hoses,fuel pressure regulator,spark plugs,coil packs,pcv valve,cleaned the throtel body,replaced air filter.before i did this their was a code P0401,no code now.and before i replaced all these parts, the problem would come and go. now its always their.i used to be a chevy man,im trying to expand. signed heavy chevy.
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Best Answer
Visitor, April 27, 2010, 12:26idle air sensor is bad
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Visitor, June 05, 2010, 11:44Replythis engine has no idle air sensor. it has a new IAC valve, the problem is the EGR is opening to soon. cruising around 1000 to 1500 the egr opens and closes causing a surging effect , a stumbling. the idle goes up and down even in park. when you put it in 4x4 low you cant maintain a steady speed because of the surging the rpm is between 1000 and 1500 if any one has the fix i would be very happy, i have spent over 1500 dollars trying to fix this . you would be surprised''' my phone# is 706 237 3864 i will cut a jig for you.
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Answer #2
bmdouble August 10, 2010, 22:35Reply
JourneymanIt sounds similar to an exhaust restriction.put a vacuum gauge on a vacuum line and rap the throttle while in park.the vacuum should snap back to what it was at idle.if it moves slowly to the reading at idle you have a restriction.also the baro pid is a telltale sign(if you have a scan tool available)anything in the 149hz and below is also an indicator.or if you have access to a backpressure gauge,should not read above 3psi.good luck!
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