Quote:
Originally Posted by 96z2
Just took off the coil pack for cylinder 3 (rear passenger) and removed the spark plug. Plug looked fine, but I got a new OEM one so put it in. Also took off the cylinder 1 (front passenger) coil pack and swapped it with the original cylinder 3 one. Started it up, no change to symptoms. Rough idle/surging. Didn't want to take it for an actual drive. Still showing P0300 and P0303 (I cleared it and it persists, so looks like the coil pack is in the clear).
I have an appointment at the dealer on Monday, but anything else to look at before then? Could it be an injector issue?
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You did the easy part: move or replace the spark plug and move the coil eslewhere. If it doesn't move, then the problem could come from anything that didn't follow the park plug or coil. ANYTHING. Injector, coil driver, injector driver, wiring/connectors, or even engine mechanical .
Remember, you need 3 things to get boom: Fuel, Spark and Compression.
If you are bringing it to a shop, stop messing with it because you'll just make the guy's job harder. Doing the easy, non-invasive part was perfectly fine, but leave it virgin, otherwise it's a PITA to work around someone else's mess and makes discerning real evidence of a fault from "someone fucked with this before bringing it in" really hard. It can turn a straight forwards diag job with one root cause into a parts cannon job just to eliminate the uncertainties the previous guy introduced.
The tech is already going to redo what you just did anyway. Even if you tell him you did it, it's his job to do it again, because he can't take what you tell him for granted, customers lie, either by omission or ignorance and listening to them is a sure way to mess up. He has to let the car do the talking.