90 olds minivan


Old 03-16-04, 07:26 AM
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90 olds minivan

i have a 90 olds minivan and it is missing. i replaced the plugs,wires,dis cap,rotor and it is still missing. i was wondering if it could be the cat covter. that is the only thing i can think of.i don't want to take it to the shop and find out it is somthing i could of fixed myself please help or tell me what i can check.
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Old 03-16-04, 12:57 PM
Join Date: Feb 2003
Location: ct
Posts: 86
my take is its a..........

vaccum leak somewhere. Maybe the intake manifold has a bad gasket or you have vacumm hose that fell off or has rotted. A miss to me means bad plug or lean mixture. How did the plugs look that you changed? If some were extra light color, that could be a lean mixture caused by tooooo much air!
Old 03-16-04, 02:52 PM
Desi501's Avatar
Join Date: Oct 2003
Location: Boynton Beach Florida
Posts: 2,207
Most of the one's I've had acting like that had dirty fuel injectors. GM V6's are notorious for that and there are numerous TSB's on the subject. Get a profession pressure cleaning. It surely won't hurt and likely will fix the problem. Don't bother adding anything to the tank, that's not strong enough.

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