crx_si-r

ok, so my 97 ex civic was running fine. did a fluid flush (brakes, transmission, clutch and power steering) then used seafom to clean carbon xdeposits. then next day code 14 (iac). i have replaced it 3 time all with brand newe denso replacements. also wapped in a new battery and still same issue. i have done everything i can think of short of building a new harness. am i missing something?????????

guessohw

I'm assuming you have reset the ecu?

crx_si-r

yes, numerous times

spoofmastafly

Same issue here.. I've tried 4 different iacv's and the CEL just keeps coming back. Only stays off if i use a pr4 ecu over the p75 I want to use. Idle still isnt consistant. 94 LS motor tho.

crx_si-r

got it checked out, and so far for 2 weeks no check engine light. looks like problem was ECT, water temp switch and Fan switch. ecu was receiving a signal of 225 degrees while the gauge was only reading 1/4 of the way.

so far no problems

Former User

You never mentioned an idle problem.

When an OBD2 car like yours throws code 14, you should next pull the OBD2 code with a code reader. Had you done this, you almost surely would have retrieved P0505. One possible cause for P0505 is a bad ECT sensor.

crx_si-r

i didnt have an idle issue, just a random code 14. and yes i used a code reader which promted a code 14/p0505 and i think it was a p0515, dont recall if thats the correct code since its been a whil since i used the code reader.
i had to use the snap on reader from the shop owner i know to find out the temp readings.

Former User

Let me try to explain. Jumping the service connector retrieves OBD1 version CEL codes from 96-00 Civics, even though they have an OBD2 ECU. OBD2 codes, however, yield more detailed information. For example, if you jump the service connector and retrieve code 14 from a 96-00 Civic and then use a code reader to retrieve OBD2 code, you will recover one of two codes - P0505 or P1508/P1509. (There is no P0515 for our Civics.) These OBD2 codes indicate a different type of problem in the idle control system and therefore are more help in pinpointing the problem.

crx_si-r

dont have to explain. i already said i used a code reader. and had a code for iac. i may have confused the 515 with a 505. obd2 reader prompted iac failure. all data suggested ect or clogged ports as possible problems.

i used the snap on scanner and saw the info i mentioned above.