What is my problem? Is it coils? 97 SE
#1
What is my problem? Is it coils? 97 SE
So ive got a 1997 maxima se. Im in total love with the car but just cant figure out my problem. No engine codes apear. Car is at 226000 KM.
SYMPTOMS (symptoms are intermitent)
-Car bogs at seemingly random times under 4500 rpm
-When car is at idle the bog is usually enough to cause the car to die completely
-Car has been harder and harder to start
- Obvious loss of power under 4500
-Car seems to run better when i hold at high rpm for a second or two.
-If i have the car in neutral and regulate rpm with the throttle it doesnt die but will still bog
-when bogging at iddle oil pressure light somtimes comes on until gas is applied and rpm rise.
-Black paint coating on sone coils have been damaged
ATTEMPTS TO FIX
-Vacuum leaks have been ruled out.
-Injector cleaner has been run through the system
- spark plugs are oxidized and will be changed very soon but i dont see this being the only issue
-mass airflow sensor seems to be working fine
-I doubt the cats are clogged as when it does run ok it has normal power across the board
-Battery recently swapped
-Throttle body is quite black past the airflow valve but from the valve to the airflow sensor is perfectly clean. Im not sure if its necessary to clean.
Im strongly leaning toward just replacing the coils and spark plugs but i dont want to spend on the coils if i dont need to.
SYMPTOMS (symptoms are intermitent)
-Car bogs at seemingly random times under 4500 rpm
-When car is at idle the bog is usually enough to cause the car to die completely
-Car has been harder and harder to start
- Obvious loss of power under 4500
-Car seems to run better when i hold at high rpm for a second or two.
-If i have the car in neutral and regulate rpm with the throttle it doesnt die but will still bog
-when bogging at iddle oil pressure light somtimes comes on until gas is applied and rpm rise.
-Black paint coating on sone coils have been damaged
ATTEMPTS TO FIX
-Vacuum leaks have been ruled out.
-Injector cleaner has been run through the system
- spark plugs are oxidized and will be changed very soon but i dont see this being the only issue
-mass airflow sensor seems to be working fine
-I doubt the cats are clogged as when it does run ok it has normal power across the board
-Battery recently swapped
-Throttle body is quite black past the airflow valve but from the valve to the airflow sensor is perfectly clean. Im not sure if its necessary to clean.
Im strongly leaning toward just replacing the coils and spark plugs but i dont want to spend on the coils if i dont need to.
#2
Its hard to tell without a code to read. It could be your fuel filter or fuel pressure regulator. Usually a bad coil pack just makes the car idle rough with a little loss of power when accelerating. Could still be a bad MAF. Get a spare at a junkyard... they are pretty cheap there.
Others chime in please......
Others chime in please......
#3
Its hard to tell without a code to read. It could be your fuel filter or fuel pressure regulator. Usually a bad coil pack just makes the car idle rough with a little loss of power when accelerating. Could still be a bad MAF. Get a spare at a junkyard... they are pretty cheap there.
Others chime in please......
Others chime in please......
#4
It could still be the MAF. The MAF is notorious for not throwing a code. Probably 75% of the time it doesn't throw a code. Unplugging the MAF will cause codes because the monitoring circuit is broken.
Unfortunately, replacing the MAF is about the only way you can rule it out. That's why people recommend a junkyard visit.
Unfortunately, replacing the MAF is about the only way you can rule it out. That's why people recommend a junkyard visit.
#6
I had a misfire issue and bogging as well on idle. I was told it was the mass-airflow sensor and what not.. turned out to be the coils.
Bought a brand new set of 6 Hitachi coils for $280 or so. Never had a problem for almost 2 years now with bogging/misfire issues. Make sure you get Hitachi otherwise the problem will still occur..
Bought a brand new set of 6 Hitachi coils for $280 or so. Never had a problem for almost 2 years now with bogging/misfire issues. Make sure you get Hitachi otherwise the problem will still occur..
#8
Regardless of the outcome, your Max is at the age and mileage where you should think about an injector service consisting or o-rings, pintle caps, and screens. Consider a fuel pressure regulator in the same operation. You'll save yourself a lot of headaches if nip the injector leaking issue in the bud.
#9
Regardless of the outcome, your Max is at the age and mileage where you should think about an injector service consisting or o-rings, pintle caps, and screens. Consider a fuel pressure regulator in the same operation. You'll save yourself a lot of headaches if nip the injector leaking issue in the bud.
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