Question about 1998 Hyundai Tiburon

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Possible ecm issue?

Im working on a 97 tiburon 1.8L. for my neighbor, she overheated it and blew a head gasket... i changed head gasket and thermostat and thermostat housing where coolant was leaking figured that was why the car had overheated and caused the blown head gasket. after getting it all back together and starting if for the first time i noticed both fans where on right from the start but the car ran nice and smooth and had no other apparent issues while idling in the garage. after a job of this nature i usually wait for the thermostat to open and the fans to cycle before test drive but considering the fans where on from the getgo i just waited for the tstat to open. during the test drive the first thing i noticed was the check engine light came on and then the idle started to range between 1500 and 2000 when shifting and when clutch was engaged. i turned around to go back home and hook up scanner to check for codes while pulling in garage i noticed temp gauage started to climb and the fans where no longer on... i hooked the scanner and codes where P0116 coolant temp sens out of range (witch is also brand new) P0343 cmp signal high P0444 evap purge sol circuit open P1553 iac closing coil circuit open and P01513 iac opening coil circuit open. this car had no known issues prior to overheating and blowing head gasket. i checked grounds that i removed for head gasket repair and went over every connection i touched multible times. after car sat all night and was cold start did same thing fans come on emediatly after starting car no codes and idle was around 820rpm and sat there and ran flawless till again i attempted to testdrive and didnt even get out of subdivision and car started idling high, fans where off and check engine light came back on.. i check ground G04 and G03 and appear to be good. all fuses and relays check out ok. any and all help would be greatly appreaciated on this matter.. thank you in advance ****

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I know how you feel, i had one do something similar and it turn out to be a vacuum left off the intake. but many times you probably got a mix wire hook up wrong; now day their more then one plug will fit the same sensor too. just keep looking over the engine sensors and vacuums for a couple of tdays and finally it will pop right out at you!!!!!!!!!

Posted on Mar 06, 2009

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