08’ G37 loss of power + p300 code
06-08-2019, 10:44 AM
#1
08’ G37 loss of power + p300 code
Hi all, it’s my first post so if I’m not in the right section please redirect me.
So I bought a used g37 coupe with 200,000 km and the past 2 months it was running like a dream. A week ago however I noticed a big and noticeable power loss like 15-20% especially in lower rpm’s and something like a hesitation as well. My idle is also rough and fluctuates; and then I got the p300 code a few days ago. My mechanic recommends I should start with changing the spark plugs so I just wanted to ask; is there anything else that could be causing this power loss and code? A reply would be greatly appreciated!!
So I bought a used g37 coupe with 200,000 km and the past 2 months it was running like a dream. A week ago however I noticed a big and noticeable power loss like 15-20% especially in lower rpm’s and something like a hesitation as well. My idle is also rough and fluctuates; and then I got the p300 code a few days ago. My mechanic recommends I should start with changing the spark plugs so I just wanted to ask; is there anything else that could be causing this power loss and code? A reply would be greatly appreciated!!
06-08-2019, 10:46 AM
#2
Hi all, it’s my first post so if I’m not in the right section please redirect me.
So I bought a used g37 coupe with 200,000 km and the past 2 months it was running like a dream. A week ago however I noticed a big and noticeable power loss like 15-20% especially in lower rpm’s and something like a hesitation as well. My idle is also rough and fluctuates; and then I got the p300 code a few days ago. My mechanic recommends I should start with changing the spark plugs so I just wanted to ask; is there anything else that could be causing this power loss and code? A reply would be greatly appreciated!!
So I bought a used g37 coupe with 200,000 km and the past 2 months it was running like a dream. A week ago however I noticed a big and noticeable power loss like 15-20% especially in lower rpm’s and something like a hesitation as well. My idle is also rough and fluctuates; and then I got the p300 code a few days ago. My mechanic recommends I should start with changing the spark plugs so I just wanted to ask; is there anything else that could be causing this power loss and code? A reply would be greatly appreciated!!
The following users liked this post:
Khalil37 (06-08-2019)
06-08-2019, 11:16 AM
#4
At 200K km (approx. 125K mi.) your car is definitely in need of some maintenance. I can only imagine how gunked up your throttle bodies are. I would do all of the maintenance items PNW_IPL suggested including the obvious air/oil filter changes, etc.
These items are relatively easy for the home mechanic to do (if you are able) and would make for a good Saturday project. There are a few DIY threads on the forum to give you a idea of what is involved:
Throttle Body Cleaning
Changing Spark Plugs
Hope some of this helps!
Alex
These items are relatively easy for the home mechanic to do (if you are able) and would make for a good Saturday project. There are a few DIY threads on the forum to give you a idea of what is involved:
Throttle Body Cleaning
Changing Spark Plugs
Hope some of this helps!
Alex
06-10-2019, 11:03 AM
#5
I just replaced my plugs in my car at 157kms, and they were lookin pretty fouled... I would be floored if the original plugs are in the car, but such things do happen... also cleaned my TB’s at 156k, they weren’t bad but they were starting to collect serious gunk. Try these things and see what happens
Thread
Thread Starter
Forum
Replies
Last Post
leeladisky
Engine, Drivetrain & Forced-Induction
11
06-23-2008 09:45 PM