Odd problem, car randomly runs on four cylinders
Thread Starter
Joined: Aug 2006
Posts: 1,458
Likes: 1
From: Apple Valley - So Cal
Odd problem, car randomly runs on four cylinders I know how that sounds but thats what happens. I'll be driving along and out of nowhere it just starts running on what I'm guessing is four cylinders. Although I can't be sure but thats what it sounds like. It does not sound anything like a misfire. I have no idea where to begin looking for the issue. Car has 145000 miles on it. New opti, plugs, wires, coil, injectors.
Thread Starter
Joined: Aug 2006
Posts: 1,458
Likes: 1
From: Apple Valley - So Cal
Thread Starter
Joined: Aug 2006
Posts: 1,458
Likes: 1
From: Apple Valley - So Cal
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Does this happen only when you accelerate? Did this start happening after you worked on it? It could also be plug wires. Do you have headers? Check them carefully to see if any of them are burnt or damaged.
Thread Starter
Joined: Aug 2006
Posts: 1,458
Likes: 1
From: Apple Valley - So Cal
Just guessing it does by the way it sounds. I have had misfires and it sounds nothing like this. When it happens it reminds me of a four cylinder with a loud exhaust.
I know thats not how, I was just stating that when I turn the car off and back on it goes away. It happens just whenever. Sometimes when cruising, sometimes when cold, sometimes when hot, it has never happened when I'm gettin on it. I'll go grab a fuel pressure guage and see what happens. This has been going on for a while just starting doing it more often lately. I have LT headers, I'll give the wires another good look. Thanks alot.
That's not how you test your fuel pump. You need to get a fuel pressure gauge that you can buy from any parts store, put it on your Schrader valve, take the vacuum line off the fuel pressure regulator, place the gauge to where you can see it while driving and take a trip around the block. Give the throttle a few quick blips and see what the gauge reads. It should read a consistent 43 to 45psi (factory is 43.5). If the pressure goes below these readings then most likely it is going bad.
Does this happen only when you accelerate? Did this start happening after you worked on it? It could also be plug wires. Do you have headers? Check them carefully to see if any of them are burnt or damaged.
Does this happen only when you accelerate? Did this start happening after you worked on it? It could also be plug wires. Do you have headers? Check them carefully to see if any of them are burnt or damaged.
Thread Starter
Joined: Aug 2006
Posts: 1,458
Likes: 1
From: Apple Valley - So Cal