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'94 eclipse throttling problem

We just bought this '94 2.0 eclipse for our son. But it has this problem of surging @ idle and throttle response is almost immediate to 2000-2500 rpm and returns back to this surging idle very slowly. I checked and replaced the TPS, but no change. I originallly mistook an engine code as showing the air inlet sensor bad, and bought one, but it wasnt the case. I got an incorrect reading due to unplugging the sensors while engine running and didnt clear them. I took the throttle body off, cleaned all components, checked vavuem lines from it and to the egr vale and solenoid, but all looked good. All the voltages to the TPS, ICS and Air sensors are correct. I reinstalled everything and checked the engine codes for faults but no codes showed up except for the Normal code for ecu. Am I missing something ? Any suggestions would be appreciated.

rayl

Reply to
Raymond Lapointe
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Reply to
simpleton

Thanks for the response. I'll be getting the mopar product today and try it out. I wanted to add, to be more explicit about this idle. It only idles @ 1600 and this surges from 1600 to 1700 every second. I tried disconnecting a plug at a time to see if any difference, but it does the same thing regardless.

I see that some one previous to me put a new alternator belt on and also the fuse for it had been blown and they bypassed it. But its charging, although voltage is alittle high @ 14+.

At first start, rpm goes to almost 3000, then after a few seconds, drops back to 2000 and then after warming for a few more seconds, to this

1600-1700 surge idle.

Also, now at startup, I'm getting a belt squeal vicinity of alternator, but havent pinpointed it yet. Smokes for a few seconds and then stops. Have to look at th e alternator, maybe bearings or overload. But could be something else in that area.

thanks

Reply to
Raymond Lapointe

I have to add one last thing, I hope. If the closed throttle position is disconnected, rpm jumps to almost 3000. Any significance?

thanks

Reply to
Raymond Lapointe

I noticed that removing the air tube with engine running, albeit a little rough, it idled at the normal speed of 700 + - rpm. ECU compensation?

components,

Reply to
Raymond Lapointe

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