09maxshawn11

I have a couple questions 1st question what happen if your car is getting too much air but the mass air flow sensor is not reading the air flow?


Second question what does it mean when your car cyclinder 5 isnt working do i need to change spark plugs? Coils?, or injectors? Or spark plug wires? Can someone please help me

Derrick2k2SE

iTrader: (3)

#1 If air is entering the throttle body or intake without first passing by the MAF it's a problem. It can be from a torn intake boot or other intake leak. The problem is that the computer will add the appropriate amount of fuel for what passes by the MAF. More air will cause it to run lean or kick it into "limp" mode to protect itself from the lean condition.

If the MAF is failing (common problem) it can show itself in many different ways. Running rich, going into limp mode, loss of power, failure to rev past a certain RPM etc... I don't believe it will cause your misfire though.

#2 Could be the plug or coil. We don't have "wires" in the old school sense but make sure the wires to the coil aren't damaged. Beyond that they don't need maintenance.
What year is the car and how old are the plugs. Early 3.0 cars had weak coils. If it's a 3.0 and there's not a white circle or dot on the coil it's probably one of the early ones. The new replacement coils have been upgraded and have a white circle on the top.

Easiest course would be to replace the plug. If it still fails swap the coil around and see if the misfire moves to the location of the new coil.

09maxshawn11

Okay thanks thanks alot ill trying to coils and spark plugs. I actually lost alot of power and all my catalytic converters went also so ill try the spark plugs and coils just replaced all the o2 sensors so hopefully it will be some progress just changed all o2 sensors, put a whole brand new exhaust on it, and put 3 brand new catalytic converters on it. My next move will be spark plugs and coils

Derrick2k2SE

iTrader: (3)

If you have a plug that's not firing then you're putting raw fuel right into the catalytic converters. That's a sure way to kill them.

If the plugs are old just replace them. The coils are pricey to replace if they're not bad so try the plugs first. There's no point in replacing working coils unless you have the old style original ones from 2000. They're not a "wear item" like plugs, belts, tires etc...

Edit: I just reread the title and see you have a 3.5 liter so I certainly wouldn't replace all the coils. It's still possible one is bad but less likely.

09maxshawn11

Yeah its a 2002 3.5liter (se) so ill just start with the plugs and put some good gas in it and lucus engine cleaner in the gas tank and take it for a drive then us a code reader and see whats going on thanks for the advice and tips hopefully they'll work

Child_uv_KoRn

iTrader: (7)

Swap #5 coil pack around if you want to test it. See if the misfire changes cylinders.

maxinout93

if you are lucky like i was, u will find your number 5 coil soaked in oil, and most likely part of your problem.

09maxshawn11

thanks for the info