2001 Z06 Sluggish Acceleration
Melting Slicks
Joined: Aug 2011
Posts: 2,423
Likes: 200
From: Atlanta GA
Thread Starter
6th Gear
Joined: Aug 2017
Posts: 6
Likes: 0
Sluggish Z06
Battery Voltage 14.1
1 Code - P0300H
2004 the dealership replaced (2) spark plugs #2 & 4 at 8,300 miles. From what I remember the car felt like the motor was going to fall out.
Now the acceleration just seems sluggish. Idle is just a little rough.
The check engine light flashes, but the dealer indicated a long time ago this was an air check valve and I have read this does not necessarily need to be fixed. What does everybody think about this?
1 Code - P0300H
2004 the dealership replaced (2) spark plugs #2 & 4 at 8,300 miles. From what I remember the car felt like the motor was going to fall out.
Now the acceleration just seems sluggish. Idle is just a little rough.
The check engine light flashes, but the dealer indicated a long time ago this was an air check valve and I have read this does not necessarily need to be fixed. What does everybody think about this?
Safety Car
Joined: Feb 2013
Posts: 4,346
Likes: 755
From: Greensboro Nc
Battery Voltage 14.1
1 Code - P0300H
2004 the dealership replaced (2) spark plugs #2 & 4 at 8,300 miles. From what I remember the car felt like the motor was going to fall out.
Now the acceleration just seems sluggish. Idle is just a little rough.
The check engine light flashes, but the dealer indicated a long time ago this was an air check valve and I have read this does not necessarily need to be fixed. What does everybody think about this?
1 Code - P0300H
2004 the dealership replaced (2) spark plugs #2 & 4 at 8,300 miles. From what I remember the car felt like the motor was going to fall out.
Now the acceleration just seems sluggish. Idle is just a little rough.
The check engine light flashes, but the dealer indicated a long time ago this was an air check valve and I have read this does not necessarily need to be fixed. What does everybody think about this?
The flashing check engine light doesn't indicate an air check valve, its the car telling you there's a misfire.
I would go ahead and replace all tuneup items even if it isn't at the designated mileage. Spark plugs, wires, air filter, fuel filter, pcv valve. And if the dealer told you the flashing CEL was indicating a bad check valve, stop going to that dealer.
Safety Car
Joined: Feb 2013
Posts: 4,346
Likes: 755
From: Greensboro Nc
Another thing you could do since you also indicate that the idle is rough, is very carefully disconnect each plug wire and see if there's a change in idle. Honestly though, since there isn't a code for a specific cylinder I would start with just a tuneup. As old as it is, it certainly wont hurt.
Racer
Joined: Mar 2016
Posts: 437
Likes: 39
From: PA
In addition to what has been mentioned I would suggest removing and cleaning the MAF with MAF cleaner spray. A dirty MAF can cause those symptoms. I am not sure if you have an aftermarket air intake on the car or a k&n filter but oiled filters can lead to build up on the MAF sensors and cause rough idling and acceleration as I've experienced in the past.
Melting Slicks
Joined: Nov 2005
Posts: 2,297
Likes: 156
From: Clayton New Jersey
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1st Gear
Joined: Nov 2020
Posts: 1
Likes: 0
Good day! I had a similar problem with my 01 C5 running sluggish when passing on the interstate and ran across a suggestion here to try Chevron Techron, so I did.
That **** is magical. My car has never run better -- quicker acceleration at all speeds.
That **** is magical. My car has never run better -- quicker acceleration at all speeds.
Instructor
Joined: Jul 2018
Posts: 222
Likes: 73
From: Kansas
I was just about to respond with the same thing... Sounds like injectors need cleaning. I'll second the Techron - try a bottle... Good luck!
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