G35 Coupe V35 2003 - 07 Discussion about the 1st Generation V35 G35 Coupe

Six-speed manual hesitation when punching the gas

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Old Feb 13, 2020 | 06:03 PM
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Six-speed manual hesitation when punching the gas

The car idles fine, if I slowly pick up speed it's also normal. No check engine light but I did put regular gas in today. When I punch the gas in any gear it hesitates and I feel a small vibration. If I slowly pick up speed in any gear it drives normal it's when I punch the gas even a little bit to pick up speed quicker that it hesitates and I feel like it vibrates a bit from the back. No slip light or anything
 
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Old Feb 14, 2020 | 09:07 AM
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Is this a sign of a clogged catalytic converter I'm not getting any check engine lights and I have loss of power
 
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Old Feb 14, 2020 | 11:35 AM
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I'm going to go way out on a limb and suggest going back to preimum fuel.
 
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Old Feb 14, 2020 | 12:09 PM
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Sounds like a vacuum leak. Also sounds like you need to pull and inspect all your spark plugs.
 
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Old Feb 14, 2020 | 04:06 PM
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Originally Posted by cleric670
Sounds like a vacuum leak. Also sounds like you need to pull and inspect all your spark plugs.
finally got a check engine light, I pulled up three codes, 0300, 0302, 0327

It seems like it could be coil pack 2 and it's causing the knock sensor to kick on. Past few days a heard two pops It sounded like when you open a Snapple bottle.
I'm going to change the coil and spark plugs see what happens thanks for your help
 
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Old Feb 14, 2020 | 05:33 PM
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I'd start with the spark plugs, that code doesn't mean it was exactly the coil pack, just that the coil pack did not discharge.
 
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Old Feb 14, 2020 | 05:37 PM
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Knock sensor doesn't cause a misfire either, on every positive detection it makes the ECM pull -2° timing, every rotation without knock the ECM will add back +1° timing. These engines are always right on the edge of knocking and it usually detects quite a few on a hard pull, this isn't abnormal for this engine.

That code is almost always the knock sensor SUB HARNESS which is a known failure part, the insulation crumbles off the wire on the sub harness.
 
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Old Feb 15, 2020 | 11:41 AM
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You're getting knock and misfires due to shitty gas. Fill up with premium and see if it clears up.

The fact you say it does it when punching it means it happens when under load, that's when the ECU advances timing and because it's tuned to premium you start getting knock. If still doing it after a full tank of premium, then start diagnosing the codes, etc.
 
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Old Feb 15, 2020 | 05:26 PM
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Well well I found the problem there's oil in the tube. Seems like the plug was really loose and so was the coil pack. I know I have to change my valve covers but what do I do to clean out the well inside just so it works for now
 
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Old Feb 15, 2020 | 06:25 PM
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Just taking the spark plug out lets all the oil drain out into the cylinder. It will smoke for a few seconds when it fires up but that's pretty much all you need to do.

The center electrode on your spark plug is 100% worn off, those things probably have 150k on them and should have been replaced about 100k miles ago. I'm betting the rest of your spark plugs are in the same condition, replace them all.

Coil pack is probably fine, just wipe it down, I would pull the coils every oil change and get the oil out of the spark plug well tube. You can limp it along like that for quite a while until you have a good time to change out those valve covers.
 
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Old Feb 15, 2020 | 06:52 PM
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Originally Posted by cleric670
Just taking the spark plug out lets all the oil drain out into the cylinder. It will smoke for a few seconds when it fires up but that's pretty much all you need to do.

The center electrode on your spark plug is 100% worn off, those things probably have 150k on them and should have been replaced about 100k miles ago. I'm betting the rest of your spark plugs are in the same condition, replace them all.

Coil pack is probably fine, just wipe it down, I would pull the coils every oil change and get the oil out of the spark plug well tube. You can limp it along like that for quite a while until you have a good time to change out those valve covers.
It's way too cold to change the valve covers right now. I actually have them just haven't had the weather to put them in yet. I'm going to replace that plug and the clean the coil. I have a new coil is it worth it to just change it or should I clean it and reuse
 
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Old Feb 15, 2020 | 08:50 PM
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I would reuse the existing coil and see how it runs. The codes were probably just from the oil saturation and the plugs being long overdue for replacement.
 
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Old Feb 16, 2020 | 10:53 AM
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I changed the coil just because the old coil seemed like it was worn out. Change the plug and the car runs fine again I appreciate you guys help
 
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Old Feb 16, 2020 | 11:47 AM
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Awesome, you definitely need to pull and inspect the gap on the remaining plugs though. Since you have one new plug you might as well replace the remaining 5.
 
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Old Feb 17, 2020 | 12:46 PM
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Glad you found the misfire source. Since the valve cover is leaking, I would put a blob of dielectric grease on the tip of the coil. Will help with oil contamination. Won't be perfect, but it'll last a little longer when that tube fills up again.

Like recommended above, I'd check the other plugs. If that was the only bad one, I'd then check injectors. Electrodes burning off can be a sign of getting lean. Hopefully just a bad coil pack though and you're good to go.
 
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