Cadillac
 

Cadillac Forums | Help Us Help You | Advertise | Cadillac Parts | Cadillac News | Cadillac Classifieds

Cadillac Technical Archive | Cadillac Dealers | Cadillac Reviews | Cadillac Dealer Reviews | Cadillac Vendors

Results 1 to 4 of 4

Thread: Quick Fix for a P0300 caused by a Clogged Fuel Injector

  1. #1
    digitalcaddie is offline Cadillac Owners Fanatic
    Automobile(s): '02 Escalade
    Join Date
    May 2005
    Posts
    200

    Quick Fix for a P0300 caused by a Clogged Fuel Injector

    So here were my symptoms. The car was running really rough and shaking sometimes due to misfires. The P0300 Engine Misfire Detected was the only code I got so I wasn't quite sure what to do. I tested the coils by swapping them one at a time with a new one, but the old ones were OK. I pulled and replaced the spark plugs, but that didn't fix my problem. I misted the plug wires with water in the dark and didn't see any sparks so I measured the resistance of those. All of them were below 10k ohms so they should have been OK, but I replaced them anyway. However, I still had the same problem. So I called my mechanic and he suggested that I might have a clogged fuel injector. To verify that they are working, pull the beauty cover, start the engine and hold the tip of a flathead screwdriver flush against the body of each injector. For the novices, the injectors are the 8 things sticking up inside the V of the engine that have a 2-wire electrical connector sticking straight up out of them. Then put your ear against the end of handle of the screwdriver while plugging your other ear. If the injector is working properly, you'll easily be able to hear a regular click, click, click. I know it sounds weird, but give it a shot. If you don't hear clicking, then you found the injector that is bad and may be plugged. Next, take a small hammer or some other object (I used the 6" extension from my socket set) and tap the side of the bad injector a couple times. In my case, that cleared the clog and the car is back to running good again. Next, go get yourself a cold one and enjoy the fact that you fixed your car without getting dirty or busting any knuckles or spending a nickel. Actually buying some injector cleaner might be a good idea even though its hard to tell if that stuff does anything.


  2. Remove Advertisements
    CadillacForums.com
    Advertisements
     

  3. #2
    Join Date
    May 2004
    Location
    Dallas, Texas
    Age
    55
    Posts
    30

    Re: Quick Fix for a P0300 caused by a Clogged Fuel Injector

    Thanks for the info. I always wondered how to find a bad injector without replacing them all. It's expensive especially if that isn't the problem.

  4. #3
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
    Automobile(s): 2002.5 F55 STS - 67,500 miles, 2014 Explorer XLT FWD
    Join Date
    Feb 2006
    Location
    MD Eastern Shore, Kent Island
    Age
    77
    Posts
    56,842

    Re: Quick Fix for a P0300 caused by a Clogged Fuel Injector

    gOOdy, Nice thread bump........1.3 years !! At least someone reads the good ol' stuff.

    Another method, discussed in here many times, is to head to your local Walgreen (large chain drugstore) and pick up a cheap stethoscope. Remove the chest diaphragm and replace it with a length of automotive vacuum hose. Use the rig to listen to injectors, squeaks, vacuum leaks, etc.

  5. #4
    txtaz is offline Cadillac Owners Fanatic
    Automobile(s): 72,92,02 Eldorado
    Join Date
    Jan 2013
    Age
    55
    Posts
    185

    Re: Quick Fix for a P0300 caused by a Clogged Fuel Injector

    Big bump.
    Good info here.


Bookmarks

Cadillac Posting Rules

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Read about Lincoln | Buick | Kia Forte Forum