Please Help!!! Could be something major???
Thread Starter
Teching In
Joined: May 2006
Posts: 19
Likes: 0
From: Houston, TX
Please Help!!! Could be something major??? Please help!!!
I had my car dyno tuned a couple months ago with some large bore heads on my stock displacement LS6. The head and cam combo wasn't very impressive so I decided to change head and cams.
I went with AFR 205's milled .0020 and Patrick G Torque cam. After install the car rans absolutely amazing. I took it back to the same place to have it dyno tuned again. Picked up 30rwhp and 30rwtq!!!
Here is the story.
On the first pull of dyno tuning there was some detonation. According to the guys who tuned my car, there was room for a lot of timing advance because of the large bore heads. The compression ratio was greatly increased with the new heads causing the detonation. Didn't think much of it.........these guys are professionals!!! He punched in some thing on his lap top and dyno'ed it again and sent me on my way.
The car was night and day different after the tune. Throttle response was lazy, didn't feel like a 500HP machine........anymore!
About 150 miles later, check engine light comes on. Car now makes some nasty "clanking" sound at idle-2000 rpm. I take the car to autozone to see why the check engine light is on. It turns out right and left knock sensors are the problem.
Called the place that tuned it and they said it could be an "internal engine malfunction".
WTF??? Any ideas on what could be going on with this thing?? I need some expert advise. I am affraid to drive this thing after I invested over $4K. I have not raced or ragged this thing out. This is a weekend car.
Thank you!!
I had my car dyno tuned a couple months ago with some large bore heads on my stock displacement LS6. The head and cam combo wasn't very impressive so I decided to change head and cams.
I went with AFR 205's milled .0020 and Patrick G Torque cam. After install the car rans absolutely amazing. I took it back to the same place to have it dyno tuned again. Picked up 30rwhp and 30rwtq!!!
Here is the story.
On the first pull of dyno tuning there was some detonation. According to the guys who tuned my car, there was room for a lot of timing advance because of the large bore heads. The compression ratio was greatly increased with the new heads causing the detonation. Didn't think much of it.........these guys are professionals!!! He punched in some thing on his lap top and dyno'ed it again and sent me on my way.
The car was night and day different after the tune. Throttle response was lazy, didn't feel like a 500HP machine........anymore!
About 150 miles later, check engine light comes on. Car now makes some nasty "clanking" sound at idle-2000 rpm. I take the car to autozone to see why the check engine light is on. It turns out right and left knock sensors are the problem.
Called the place that tuned it and they said it could be an "internal engine malfunction".
WTF??? Any ideas on what could be going on with this thing?? I need some expert advise. I am affraid to drive this thing after I invested over $4K. I have not raced or ragged this thing out. This is a weekend car.
Thank you!!
Last edited by blkonblkz06; Jul 31, 2006 at 11:00 AM. Reason: Additional info.
I am on my friends computer and I forgot my password.
According to Autozone it is the knock sensors. What would be causing this?? Should I be concerned and most importantly..........how do I fix it??
Like I said above, there is some rattle in the engine at idle-2000rpm.
What do you think??
Thanks!!
According to Autozone it is the knock sensors. What would be causing this?? Should I be concerned and most importantly..........how do I fix it??
Like I said above, there is some rattle in the engine at idle-2000rpm.
What do you think??
Thanks!!
TECH Enthusiast
iTrader: (17)
Joined: Sep 2005
Posts: 619
Likes: 0
From: Detroit, MI - Camp Pendleton, CA
Something internally maybe bad. It could be anything. Get the noise checked out. Your knock sensors are going way out of range to compensate for the mechanical knock. The knock sensors are thinking its detenation so the PCM is pulling alot of timing. If it knocks it will pull timing way to far and say your knock sensors are bad. Its not the sensors its something inside. Maybe a collapsed lifter but it could be worse. Could even be the tune being way lean. Take it back, it could have done something bad if they advanced timing too much.
-Alex
-Alex
I plan on taking it back to have them look at it. From what they told me, they backed the timing out a bunch because of the gain in compression. The car ran awsome when I drove it up to get tuned. On the way home from getting tuned it didn't run like crap but didn't run even close to as good as it did up there.
Thanks Alex.
Thanks Alex.
Do you know what the tuner changed? sounds like they took a good tune and made it bad.
__________________
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
Trending Topics
They just said they took out some timing. I wish I knew more, I could call them but you can never get in contact with anyone.
The guy ran it on the dyno, it detonated pretty bad. After that, he went and got his lap top, punched in a couple things, dyno'ed it, and sent me on my way. That was it.
I sent you couple PM's today Patrick. Thanks for your imput.
The guy ran it on the dyno, it detonated pretty bad. After that, he went and got his lap top, punched in a couple things, dyno'ed it, and sent me on my way. That was it.
I sent you couple PM's today Patrick. Thanks for your imput.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo Their are multiple codes related to the knock sensors, I would check and see what specific codes it has stored and go from their. It could be the sensors not working and timing pulled back or the sensors detecting too much knock, etc
Could it be you are missing on a cylinder.. You would def get a SES light, and knock sensor codes.
Something stupid......plug wire fell of... check all the wires, make sure they are nice and tight.
I wouldnt run the car. It could be something worse....but look at the simple stuff first.
Something stupid......plug wire fell of... check all the wires, make sure they are nice and tight.
I wouldnt run the car. It could be something worse....but look at the simple stuff first.