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Old 08-09-2015, 04:18 PM
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94 TBI Low Idle

Club members boat in the ski club: Extremely low idle on the 94, it has no codes stored, flashed 12 with the codemate and nothing else. New cap and rotor, plug wires triple checked and correct, was idling a bit low a few months ago but today, barely running BUT, up the idle with throttle and it skies like normal, PP kicks in boat is normal, manual getting idle above 800, it skies perfect.

Idle is around 450, hitting hard, but again, runs normal above 800 rpm. Boat has 3042 hrs, rebuild at 2100 hrs. Any ideas? Probably going to check IAC this afternoon, clean and reinstall or get new one tomorrow.
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Old 08-09-2015, 05:06 PM
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probably to IAC - what happens when you open throttle to give it more air? remove the IAC and see if she runs better. Also could be low fuel pressure... does it sound slow or just showing slow on that tach?
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Old 08-09-2015, 05:08 PM
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she's barely running but throttle up and she's normal
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Old 08-09-2015, 05:15 PM
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pop the IAC out leave it plugged in so you don't throw a code - be careful of pintle.
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Old 08-09-2015, 05:16 PM
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If that does not work.. could be a bad TPS as well -- IMO...
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Old 08-09-2015, 05:21 PM
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Just checked manual - could be a bad ICM as well - other corrective action is bad timing - but if ok at more throttle I would go with ICM - I just changed out my coil and ICM - now I get a good reading on my tach and starts better.
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Old 08-09-2015, 08:28 PM
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Thanks Mike, the guy in the club that has the X14, had a 94 205(sold to step son) and we had parts between us, IAC, TPS, ICM so I'll tell Larry and see what we can do tomorrow. Also have a 95 Malibu in the club surging; it's going to be boat maintenance Monday.
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Old 08-09-2015, 09:53 PM
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Just learned that my old ICM was over heating... so I was prolly on my way to a break down... thanks Engine Nut... the yellow dot indicated module ran (was running) prolly cuz all the thermal paste was gone for prolly years...
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Old 08-09-2015, 10:20 PM
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Did you check the injector to see how the fuel looks, if your getting a good flow? I had an issue where one injector wasn't firing right and the idle was low and pulsing.
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Old 08-10-2015, 08:29 PM
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New IAC, re-timed the boat at 1000 rpm and life is good.

Malibu had code 22, Low Volts TPS, replaced, and still surging, headed to the dealer in North Little Rock AR.
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