HD acceleration

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joel.rice
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Make: Mazda
Model: 929
Year: 1993
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HD acceleration

Postby joel.rice » Mon Jul 05, 2010 5:24 am

Hi all

I am just wondering if anyone's experienced their HD having a general lack of power, not roughness, just lack of power and having to push in the accelerator almost the whole way for it drop back gears. This shouldn't be the case should it? Where should I start investigating this issue

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JAY-929
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Re: HD acceleration

Postby JAY-929 » Mon Jul 05, 2010 12:00 pm

Could be a couple of things... injectors, throttle body... I'm sure some more light will be shed on this shortly enough, however they wouldn't be bad starting points.
1988 MAZDA 929 HC SERIES 1 HARDTOP
CURRENTLY UNDER CONSTRUCTION

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ny4n
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Re: HD acceleration

Postby ny4n » Mon Jul 05, 2010 3:06 pm

my HD does that. I'm sorry to break it to ya but its the transmission. It changes up when you want it to stay in the same gear and then when you hit the speed that you want to it realizes you need more power and drops a gear. its annoying but i guess you just gotta find a way to live with it cause a new tranny for one of those could cost between 2-3k.

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KillSwitch
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Re: HD acceleration

Postby KillSwitch » Tue Jul 06, 2010 3:02 am

Yep mine does the same and only has 145000km on it, and just serviced the tranny with new filter and a full flush. 11L of Oil

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ny4n
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Re: HD acceleration

Postby ny4n » Tue Jul 06, 2010 5:20 am

believe it or not I change my transmission oil every time I service my car. I guess its the cheapest way to prevent my tranny from dieing on me.

Sometimes when I'm cruising along and I suddenly put my foot down there's this huge jolt in the transmission and it'll take like 2 seconds before it changes down. So annoying! I've considered putting in an auto box from another car but its going to be just as expensive :(

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Matsuda9
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Re: HD acceleration

Postby Matsuda9 » Tue Jul 06, 2010 9:33 am

guys you are aware that there is an adjustable kick down switch mounted above the accelerator pedal? at least HC has it :)
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ny4n
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Re: HD acceleration

Postby ny4n » Wed Jul 07, 2010 5:29 am

:wut: what's a kick down switch?? I gotta check it out. What's the HC pedal like? Does it pop out from the floor like the HDs or is it the usual style hanging from the top.

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JAY-929
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Re: HD acceleration

Postby JAY-929 » Wed Jul 07, 2010 9:12 am

YEAH??? Got pics?
1988 MAZDA 929 HC SERIES 1 HARDTOP
CURRENTLY UNDER CONSTRUCTION

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Matsuda9
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Re: HD acceleration

Postby Matsuda9 » Wed Jul 07, 2010 9:14 am

it doesn't matter there is still a rod behind the pedal running to the pedal box... if you follow that rod you will see a pot-like switch which gets activated once pedal is depressed (not sure on spelling, i mean pressed down, not suicidal :lol:)

the kick down switch activates once the pedal is pressed past a point and sends a signal to the gearbox to downshift.... simple really :)
Image

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JAY-929
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Posts: 264
Joined: Tue Nov 03, 2009 10:22 pm
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Location: Melbourne, Victoria, AU

Re: HD acceleration

Postby JAY-929 » Wed Jul 07, 2010 9:19 am

Sounds like a restriction... IT MUST BE RIPPED OUT AT ONCE!!!! hahahaha
1988 MAZDA 929 HC SERIES 1 HARDTOP
CURRENTLY UNDER CONSTRUCTION


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