androyde

'95 2.0 litre auto prelude.Engine racing from cold start at approx 2000rpm.Slowly
settles down but still at about 1250 revs after 30 mins! If I turn off ignition and
restart,the revs then surge between 1000 to 3000 in an alarming fashion. Can anyone suggest a solution to this problem. Over £500 for new Honda throttle body..aaagh.

minilogoguy18

You need to check many things first.

Loose or broken vacuum line causing a vac leak
Throttle body gasket
Intake manifold gasket
Idle Air Control Valve

If there are no bad gaskets or vacuum leaks then IACV is to blame, most of the time they wont even throw a CEL when they're bad. Only time you get a code is from unplugging it altogether.

Get a couple of cans of throttle body cleaner and spray it around intake gaskets and vacuum lines, if it stumbles then you found your leak. Also try tapping on the IACV with the handle of a screwdriver and if it starts to idle normal then you found your problem.

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New Formula Red 93 BB2: JDM OBD1 H22a/T2W4 Accord Euro R transmission