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SO yea, chipped my buddies pm6, 90 crx si. No matter what map i burn, stock pm6, ng60 wit pm6 tables, etc, it will idle at 3k and stay there. it revs freely, no codes.. Swap in my old 88 si ecu and it runs fine. We're tinking bad ecu but figured it was worth a shot to post..
 

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SO yea, chipped my buddies pm6, 90 crx si. No matter what map i burn, stock pm6, ng60 wit pm6 tables, etc, it will idle at 3k and stay there. it revs freely, no codes.. Swap in my old 88 si ecu and it runs fine. We're tinking bad ecu but figured it was worth a shot to post..
What does it do if you unplug the iacv?
 

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93 Legend L Coupe.
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OBD0 ECUs don't need jumpers cut. Install chip, be happy, usually.

As far as why it's reving up that high, If the ECU was not working corrrectly, you would be getting some kind of indication at the ECU that you botched it up. I would look for a vaccuum leak. The easiest way to test for a vaccuum leak is to get a large, really cheap can of carb cleaner. Let the car idle, then start spraying the carb cleaner all over the intake manifold. If the idle dips or the car stalls, that is the area of your vacuum leak. If it passes this test, then it's probably the ECU, but just to be sure, I would follow the troubleshooting flowcharts for the idle circuits as found in the Helms.

Also, can y ou get good shots of the soldering done? You may have a cold or incomplete joint somewhere. This would be a pretty easy fix, as you would just desolder then reseolder the chip or socket.
 

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97 GSX-R 750
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was the ecu fine before you chipped it? Sound like a bad ecu since it worked fine w/ yours but if it was fine before you chipped it and you soldered it good that doesn't make too much sense?
 

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I'd try burning the stock PM6 map on another chip and install that in the socket [pgmfi.org for stock .bins ]. If it still has the 3k idle but when a non-chipped PM6 ECU is connected it idles fine, its obvious the ECU is bad ... either the socket or the actual ECU hardware is at issue. Check the continuity of the connectors where the wiring harness plugs in. Are you using an AT29C256 chip? When the chip is installed in the socket, check the continuity from the chips' pins to the soldered connection on the underside of the board.
 

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1991 crx dx
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i was going to ask the same thing that burnoutboy did was the car running fine before you chipped the ecu. that should tell you if the ecu was bad or not. Am i right?
 
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