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Very hard starting then uneven idle
#1

Hi all. Recently my 968 developed this problem and it continues to this day. Car will start and run for a brief few seconds then stop. This happens, many, many times until it actually starts (ran the battery dead and had to boost it last time). Once running and warm the idle verys from 900 to 2000 rpm, up an down, up and down. Once running and up to temperature it will start no problem. I saw similar posts to the starting issue but mine seems more severe. Any ides? Thanks much. Dave J.
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#2

I'd remove distributor cap and inspect the components for wear, corrosion, etc..

while at it, make sure all the plug wires / dist wire are connected well



or could it be the dreaded DME relay ? hopefully said... since that's about $ 25 and no labor charge :-)



if not , perhaps the idle stabilizer valve ? or, the temp sensor ?
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#3

there are a few things that could cause this. a few of them are:



dirty MAF

sticking ICV

vacuum leak

sticky injectors

loose spark plugs
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94 Midnight Metallic Blue Cab Porsche 968 w/deviating cashmere/black interior and WAY too many mods to list - thanks to eric for creating www.968forums.com



"It isn't nearly as expensive to do it right as it is to do it wrong."
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#4

I vote for ICV
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#5

I vote for vacuum leak.
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#6

I second vacuum leak
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#7

i've had all of the above create the symptom.



first, check the plugs to make sure they are torqued properly

then, clean the MAF with MAF cleaner

then, hook up a vacuum guage



if that does not turn up the culprit, you get to start working harder
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94 Midnight Metallic Blue Cab Porsche 968 w/deviating cashmere/black interior and WAY too many mods to list - thanks to eric for creating www.968forums.com



"It isn't nearly as expensive to do it right as it is to do it wrong."
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#8

Great thanks guys. I had already changed the wires and plugs but will check dist cap and make sure everything is clean and tight on these basic ignition components. Will also clean the <acronym title='mass air flow'>MAF</acronym> and see if that helps. If not I will move on to some of your other suggestions. Stay tuned.
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