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my vct motor has a dead spot why? 

 

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 Post subject: my vct motor has a dead spot why?
Posted: Mon Feb 10, 2014 1:11 am 
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Age: 50

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Joined: 9th Feb 2014

Ride: Au 2 ghia

Location: Perth
WA, Australia

my au2 vct has a dead spot on acceleration does anybody know what would cause it. I bought it with the problem . I think its a fuel control problem but not sure what controls it . :?: :?: :?:
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 Post subject: Re: my vct motor has a dead spot why?
Posted: Mon Feb 10, 2014 5:30 pm 
Stock as a Rock
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Age: 23

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Joined: 13th Jun 2012

Ride: Fairmont AU I

Location: Melton, vic
VIC, Australia

First place to start is the fuel filter.
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 Post subject: Re: my vct motor has a dead spot why?
Posted: Mon Feb 10, 2014 7:12 pm 
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Ride: Au 2 ghia

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WA, Australia

Thanks will look at that first.
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 Post subject: Re: my vct motor has a dead spot why?
Posted: Tue Feb 11, 2014 10:04 am 
Getting Side Ways
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Ride: EF XR6 Wagon, AU2 XR6 VCT

Power: 148 rwkw

Location: Auckland
New Zealand

If you are seeing black smoke out the exhaust when this is happening, the engine is way over-rich and flooded with fuel. Otherwise (and more likely), this sounds like the opposite problem - going too lean. Check fuel filter and check for vacuum leaks (Brakleen is great for this). Unlikely to be fuel pump, as it revs out OK. Also, could be a the oxygen sensor past its use-by date forcing the fuel trims to extreme lean. You can test this by disconnecting the sensor connector, and resetting the ECU by unplugging it for a minute or disconnecting the battery for 30 mins or so. Take it for a drive with the sensor still unplugged; if the problem goes away, your sensor is faulty.

 

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 Post subject: Re: my vct motor has a dead spot why?
Posted: Wed Feb 12, 2014 9:03 pm 
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Ride: Au 2 ghia

Location: Perth
WA, Australia

Ok great that gives me a few things to try thanks and will report.
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 Post subject: Re: my vct motor has a dead spot why?
Posted: Wed Feb 12, 2014 9:36 pm 
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Power: 133 rwkw

Location: Leeton
NSW, Australia

Mine did this too... Ended up changing the PCM to one with a different catch code but still from an AU2 manual... Seems much better ever since... Yours would be an auto but I'm guessing...

Other thing I have purchased to try is the hego sensor thinking it may have been worn out... If the morning is hot but mine doesn't do it... Only does it when the weather is cool and only for a couple of take offs until something gets little bit warm and it goes away...

Cheers,
Tim

 

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