missing engine` - Car Troubleshooting


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Anonymous Poster
talford174@charter.net

Nov 1, 2006, 5:11 PM

Post #1 of 5 (3318 views)

missing engine`	Sign In

i have a 99 s10 4.3 its been missing started out not so bad. changed plugs, wires, fuel filter, still missing then a code came up to change crankshft postion sensor. thn converter went bad thought that may have been cause of miss. also new mass air flow sensor and engine coolant temp sensor and it is still missing any ideas

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Anonymous Poster

Nov 2, 2006, 8:05 PM

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steve01832
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Nov 3, 2006, 3:44 AM

Post #3 of 5 (3310 views)

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Did you replace the crank sensor?

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Anonymous Poster

Nov 3, 2006, 4:56 PM

Post #4 of 5 (3307 views)

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yes i did, missing seems to be getting worse

steve01832
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Nov 3, 2006, 6:26 PM

Post #5 of 5 (3305 views)

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With the engine idling, at operating temperature, and the misfire occuring, remove the plug wires from the spark plugs one at a time. Make sure you use insulated plug wire pliers or you will get whacked off the coil. When you lift each wire, listen for the RPM to drop. If you find a wire that has no effect on RPM, that is the problem cylinder. Record the problem cylinder and continue through all 6 cylinders. Check for spark at the problem cylinder(s). I like to remove the spark plug from the cylinder and place it back in the plug wire. I run a jumper wire from a good ground to the side electrode of the plug. I then put a compression guage in the cylinder. I crank the engine 3 revolutions. I make note of the compression reading of the first "puff", or the first revolution of the test. I like to see at least 50 psi. By the third revolution I like to see around 120psi. If the compression checks out good, start the engine. Check the spark plug to see if it's firing. If it is, we have a fuel problem in that cylinder since our compression checked out OK. By doing the test this way we save time as we can physically see the spark plug fire and do a compression test all at one shot. We can safely narrow down to a fuel delivery problem to that cylinder. Let's start there and if you have a fuel pressure guage, let's check fuel pressure as well.

Steve

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