The Cellar - View Single Post

Undertoad · 02-07-2011, 06:54 PM

OK, the Cellar Car is experiencing intermittent rough engine and throwing the check engine light.

Some might remember that the check engine light was flashing earlier, and that I had to manage drilling out two plastic rivets in order to get to the computer to use the "back door" method to check the code. Before I could do that, the car repaired itself, which it annoyingly is failing to do this time. So I drilled out the rivets.

So the thing threw two codes, one "cylinder 4 misfire", one "multi cylinder misfire".

I looked up online and they said this is often a bad fuel injector, and how to test the fuel injectors. The resistance across each injector's connector spades should be 10-15 ohms.

It turns out that the front injectors are easy to get to and test, and the rear injectors require skill, patience and 3 hours to get to and test.

So I tested the front 3 (of a 6 cylinder engine, you see), and #2 and #4 showed 34 ohms while #6 showed 12 ohms.

So I might get two new fuel injectors and change out the known bad ones to see what that does. That's about $150 at Pep Boys. But it'll suck if one or more of the rear injectors have to be replaced too, and the only way I find out is by replacing the front bad ones and waiting for another check engine light.

02-07-2011, 06:54 PM	#45
Undertoad Radical Centrist Join Date: Jan 2001 Location: Cottage of Prussia Posts: 31,423	OK, the Cellar Car is experiencing intermittent rough engine and throwing the check engine light. Some might remember that the check engine light was flashing earlier, and that I had to manage drilling out two plastic rivets in order to get to the computer to use the "back door" method to check the code. Before I could do that, the car repaired itself, which it annoyingly is failing to do this time. So I drilled out the rivets. So the thing threw two codes, one "cylinder 4 misfire", one "multi cylinder misfire". I looked up online and they said this is often a bad fuel injector, and how to test the fuel injectors. The resistance across each injector's connector spades should be 10-15 ohms. It turns out that the front injectors are easy to get to and test, and the rear injectors require skill, patience and 3 hours to get to and test. So I tested the front 3 (of a 6 cylinder engine, you see), and #2 and #4 showed 34 ohms while #6 showed 12 ohms. So I might get two new fuel injectors and change out the known bad ones to see what that does. That's about $150 at Pep Boys. But it'll suck if one or more of the rear injectors have to be replaced too, and the only way I find out is by replacing the front bad ones and waiting for another check engine light.