Question about 1990 Pontiac Grand Prix

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How can I fix the engine from running rich? It runs so rich. It doesn't pass CA Smog? How can I isolate the problem? Also the car has been sitting in driveway for a couple years. But I started it for first time in two years and it started on first try. It runs just like it did two years ago I really want this car to pass CA Smog. The car is a 1990 Pontiac Grand Prix LE 2.4 Please help have a lot of family memories in that car! Thank You, Johnny Anglen

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  • Master
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This is what i did when my 89 chevy beretta failed and the guy handed me a pamphlet on turning in your junker car for a $1000...and he was kind of laughing like you failed and i got you money anyway because he thinks he knows that there's no way my car will pass again.
here's what i did.
#1 changed out all plugs and wires
#2 changed my oxygen sensor
#3 inspected all my vacuum hoses found a crack going to the MAP sensor
i just cut off that end and shoved it back on. and changed out the PCV valve and also found a crack in that hose but couldnt replace it, so i just rapped it real tight with black electrical tape.
#4 cleaned up throttle body real good and the IAC sensor with throttle body cleaner
#5 replaced the oil and filter
#6 serviced the transmission fluid
#7 replaced my catalytic convertor
#8 ran my car around and got it real hot before taking it in
retested and you should have seen the look on his face and i said thanks to him my car was only getting 19 to 20 miles to the gallon my dash computer says im getting 28 now. it was really low smog readings and he couldnt believe it.
so if you do all these things it cost $150 for a cheap cat
i think $40 for oxygen sensor
$30 for oil and filter
$60 for trans service
$40 plugs and wires
$7 throttle body cleaner
$8 PCV
total $335 it should pass
on my other car it failed smog so i went this time and just changed the cat and it passed..not quite as good as my beretta but a pass is a pass. try this and you'll probably at least pass! who knows you might even increse your mpg. Can you rate this, thanks!

Posted on May 09, 2010

  • steve t May 09, 2010

    oh forgot to add i also cleaned up my K&N air filter, no cost, already had the cleaning kit.

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