Clutch power problem?
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Junior User
Joined: Sep 2004
Posts: 88
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From: Phoenix-or-thereabout
Clutch power problem?
I did run a search on this, and came up empty, so I apologize if it's a repeater... I have a '91 I-6, 5 Speed Mazda, 2.73 rear axle, short bed. Within the last year, I have noticed that releasing the clutch into first from a complete stop (say, at an intersection) the truck experiences a loss of power. The battery idiot needle on the console (have not had the chance to install a real meter - it's on my list) peggs way down to Low, then snaps back to it's usual decent place. This only happens from a complete stop, and only in 1st (obviously). I did change the ignition coil not that long ago (...died on me in traffic, good times, good times...), and I replaced the alternator a few years back when the radiator ruptured (former owner negligence) and flooded the under-hood area with rusty coolant water. Battery is 6 months new, oem group 65 type. I'm not an electrical whiz, especially considering all the damn wiring under the hood on this truck, and I'm stumped.
Senior User
Joined: Feb 2002
Posts: 291
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From: Ephrata USA
Is it possible that your EFI power supply is drawing that much current upon takeoff as to draw your amperage down that far? I am not for sure on that, also, at an idle your alternator output will be lower than running at say 1500-3000 RPM, and when you takeoff the engine is demanding power suddenly putting a large draw on the alternator, you may need either a higher amperage alternator or maybe the one you have is fine and has the wrong size pulley. Also one more thing, if you have a multimeter or an inductive ampmeter, check out your alternator output, just for giggles.
Posting Guru
Joined: Nov 2003
Posts: 1,006
Likes: 4
From: Sussex County, DE
Too big an alternator pulley, or too low an engine RPM could cause it. If your IAC (Idle Air Control) Motor is bad you could be nearly stalling under these conditions, thus causing the alternator to stop charging. Or, perhaps you are lugging the engine down too low with that 2.73 rear when coming to stops. Perhaps you aren't releasing the clutch soon enough. Propably need full disengagement before dropping below 5 mph. Dammit feeniks, you broke it. DAMN IT!!! 
