Throwing codes PO300 PO420 PO507
#1
Throwing codes PO300 PO420 PO507
Figured I would start with plugs and maybe wires for the po300 misfire.. my girlfriends car cuts out badly when you first start it and periodically while your driving.. when first started it struggles to stay running then after about 20 to 30 seconds it revs to about 3000 rpm then smooths out...
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Jarrod (09-05-2016)
#3
Senior Member
Posts like a Turbo
You can check for vacuum leaks by spraying carburetor cleaner around the top of the engine(upper and lower intake, throttle body, vacuum lines) and if it revs up then you have found your leak!
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Jarrod (09-05-2016)
#4
Senior Member
True Car Nut
What model and engine is this?
It may also be wise to check the fuel pressure regulator to confirm that fuel is not coming in through the vacuum line side.
It may also be wise to check the fuel pressure regulator to confirm that fuel is not coming in through the vacuum line side.
#6
So I changed the spark plugs they were in dire need didn't change anything and in the process I found a vacuum leak. The rubber connector that connects two different sized vacuum lines to the side of throttle body couldn't find a replacement so for now I used f.r. electrical tape still no change.. I took the car about 180 miles to the illinois river this weekend then thought to maybe unhook battery for a couple hours to reset computer.. it now runs worse than when I started... I plan to check fuel pressure regulator tomorrow and check for more vacuum leaks with the carb cleaner method thanks for the input guys keep it coming.. I'll update tomorrow.. oh this is a 2000 buick lesabre with the 3.8 by the way
#8
Senior Member
Posts like a Turbo
So I changed the spark plugs they were in dire need didn't change anything and in the process I found a vacuum leak. The rubber connector that connects two different sized vacuum lines to the side of throttle body couldn't find a replacement so for now I used f.r. electrical tape still no change.. I took the car about 180 miles to the illinois river this weekend then thought to maybe unhook battery for a couple hours to reset computer.. it now runs worse than when I started... I plan to check fuel pressure regulator tomorrow and check for more vacuum leaks with the carb cleaner method thanks for the input guys keep it coming.. I'll update tomorrow.. oh this is a 2000 buick lesabre with the 3.8 by the way
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