Check engine light after moving west..
Thread Starter
Heel & Toe
Joined: Oct 2018
Posts: 22
Likes: 1
From: Tucson, AZ
Check engine light after moving west..
Hey guys. Car is a 09 Z06 with LPE intake, NW MAF, FAST 102, Cam, and headers. I just moved from Georgia to Tucson and hence suffer a downgrade in premium fuel from 93 to 91. I just did my first fill-up of 91 two weeks ago and supplemented with an octane booster (Boostane premium) to get it back up to approx 93 octane since the previous owner had said the car was tuned for 93. After this fill, I noticed the car would idle high when coming to a stop, around 1400 rpm, for about 10 seconds before settling down to the usual 900 rpm, no other weirdness. Today was the 3rd time driving the car since that fill and I got a CEL. I babied the car home and pulled codes and got a P0507 - Idle High Speed ECM, and P0325 - Knock Sensor 1 Circuit. Is that P0325 indicative of an actual knock detection or a fault with the sensor itself? Sure, it's possible that the sensor has failed but I see it as a little too much of a coincidence that it happens after I introduce different fuel to the engine. Anybody have a similar experience in dealing with this? I intend on getting the car dyno tuned to 91 octane soon. Thanks
Safety Car
Joined: May 2016
Posts: 4,667
Likes: 1,849
From: Erlanger, Kentucky
Hey guys. Car is a 09 Z06 with LPE intake, NW MAF, FAST 102, Cam, and headers. I just moved from Georgia to Tucson and hence suffer a downgrade in premium fuel from 93 to 91. I just did my first fill-up of 91 two weeks ago and supplemented with an octane booster (Boostane premium) to get it back up to approx 93 octane since the previous owner had said the car was tuned for 93. After this fill, I noticed the car would idle high when coming to a stop, around 1400 rpm, for about 10 seconds before settling down to the usual 900 rpm, no other weirdness. Today was the 3rd time driving the car since that fill and I got a CEL. I babied the car home and pulled codes and got a P0507 - Idle High Speed ECM, and P0325 - Knock Sensor 1 Circuit. Is that P0325 indicative of an actual knock detection or a fault with the sensor itself? Sure, it's possible that the sensor has failed but I see it as a little too much of a coincidence that it happens after I introduce different fuel to the engine. Anybody have a similar experience in dealing with this? I intend on getting the car dyno tuned to 91 octane soon. Thanks
If E85 is available where you are, it not a bad idea to add a sensor kit to your car as this would help with keeping the power level where it was before.
Melting Slicks
Joined: Feb 2017
Posts: 3,291
Likes: 1,283
From: Phoenix, AZ to Quakertown, PA.
C6 of Year Finalist (appearance mods) 2019
Get a hold of Joe (owner) at CPR below, these guys are the best in the Southwest if not the country. I know it’s a drive for you but you won’t be disappointed.
Cordes Performance Racing aka "CPR"
Owner of AZ's premier LSX/LTX motorsports shop
http://cordesperformanceracing.com/
https://www.facebook.com/cordesperformanceracing.comjoe@cordesperformanceracing.com
480-359-5914
Cordes Performance Racing aka "CPR"
Owner of AZ's premier LSX/LTX motorsports shop
http://cordesperformanceracing.com/
https://www.facebook.com/cordesperformanceracing.comjoe@cordesperformanceracing.com
480-359-5914
Racer
Joined: May 2017
Posts: 429
Likes: 71
That code does not mean there is knock, it means there is a malfunction in the knock sensor circuit. e.g. sensor, harness, connector, ecu. Those two issues seem like theyre unrelated? Check for loose connectors and vacuum leaks.
Im in tucson as well. What part of town?
Im in tucson as well. What part of town?
Thread Starter
Heel & Toe
Joined: Oct 2018
Posts: 22
Likes: 1
From: Tucson, AZ
Gotcha, I'll inspect the sensor and look for vacuum leaks. I'm down in the Rita Ranch area.
Racer
Joined: May 2017
Posts: 429
Likes: 71
The others talking about cordes are kinda right. Cordes is great and if you need a tune, the perfect place to be. But if you've got a minor issue its best to sort it out yourself instead of just immediately going to a performance shop. My 0.02$ Idk if you have any diagnostic tools, but you can check for knock and your LTFTs to see if there are any physical issues present versus maybe something just electrical. Welcome to AZ
Burning Brakes
Joined: Jun 2015
Posts: 826
Likes: 140
From: AZ
I would install a new knock sensor, clear the battery/codes, and see if the CEL comes back. I really doubt the octane booster is causing any issue.
as for the tuning ....maybe you can tune for e85 instead. you will lose a lot of power moving to a 91 tune. it gets HOT so you don't want to run a 93 tune, on 91.
as for the tuning ....maybe you can tune for e85 instead. you will lose a lot of power moving to a 91 tune. it gets HOT so you don't want to run a 93 tune, on 91.
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