could you explain to me what the check valves are exactly? are those the pancacke looking things where the hoses meet up to? all i have now is an annoying idle shaking problem no codes for 2 weeks just the engine shaking as if it is misfireing at idle but not codes only cure is to rev driveing is really smooth now though.

also today i was at a stoplight and the car was idleing normaly then i heard the fans kick on for a second and the rpms dropped below what they are nomally suppose to be on about 250 then whent back up to normal is that ok?

 

In - Line Check Valves

 

car has been good for a while but past few days shaking engine obvious misfires im really thinking i have low fuel pressure with that humming noise on start up now i dont know if this actually worked but now when i start i push the gas pedal all the way down then turn the key get it up to 3000 rpms (about 2-3 sec of me on the pedal) and let go it idles high normally to warm up then goes to 800 and seems fine now if the vavle that pushes fuel through is completly open i guess it is easier to go to the engine. thats what i think also what fuel pressure psi am i suppose to have for normal opeating perameters.

also got everyones favorite icon glowing on the dash cel il get the codes soon

 

it has been a while now actually a year but what was the problem was that there was a sensor that was overheating and short circuiting so if anyone is having some of these problems check for HEAT