1988 Lincoln TC has high idle and surge problems
My 1988 lincoln town car has a problem it idles @ 3500 rpm but if i turn the engine off and on it idles normally, then will start to idle high again, need my foot on the brake at stop lights. has a surge going on.
First check for any vacuum leaks, ie bad lines, intake gaskets, pcvvalve, then clean the throttle body and the ISC unit, if that doesn't fix it then you will have to get the codes checked for further diagnosis.
I have replaced the intake gaskets, idle speed control,egr valve,pcv,distributor cap and rotor now what?
If all of your vacuum hoses check good then your only option is to get the codes ran, but you need to find a shop that has the equipment to check the old Ford OBD 1.
I had same problem but I changed the TPS unit (throttle Position Sensor) and now runs fine.
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