So Many Issues....Where to start??

[afattitude]

Alright let me say I'm not going to sugar coat anything...this ******* car is having so many problems I dont know where to begin. Specs 2003 Corvette Z06 Magnacharger, NOS dry shot(yes is is actually NOS), cam, headers, intake....
I do have HPTuners but have not used it to troubleshoot anything, still learning. I am actually waiting to go to the The Tuning School seminar so i can use it efficiently. But i can do some simple things and record for you all if that will help :/ Well here it goes...............

Reduced power mode all of a sudden at idle or while in low gears normally, also idle sometime stumbles down to 500rpm which I when it feels like it will go into limp mode soon

Sometimes, usually cruising, there is a studder in power, no change in throttle position just sudden slight loss in power

Stalling out while idle or when pushing in clutch after driving, rpms just plummet to a stall

Idle also stays too high ~1200-2000 rpm in motion sometimes, when I slow to a stop and the speedometer shows zero the idle drops and returns to normal ~850 rpm

low oil pressure sometime have seen it run as low as ~23 while idling, dont know if its an issue, but just checking

Loss of all gauges including a/c, radio except rpm, speed and voltage stay working

Lose temp gauge, maxes out and shows xxx in digital readings on dash

Overheating to ~220 while idling,

while cruising in 5th or 6th gear then pushing on the throttle sometimes service abs, traction ctrl system, and service active handling

Again all of these are seemingly sporatic issues!! They NEVER always happen when i do something. But every day AT LEAST one of them will occur. PLEASE HELP!!!!!

codes
10-PCM
P1221 H C
P1515

28-TCS
U1301
C1225
C1223
C1278
C1283
C1293

40-BCM
U1255
U1096
U1016

58-SDM
U1301
60-IPC
U1255
U1064
U1040
U1016
U1160
U1176
U1088

80-RADIO
U1016
U1064
U1096

99-HVAC
U1064
U1096
U1160 C
U1255
B0361 C

A0-LDCM
No Comm.

A1-RDCM
U1255
U1064
U1016
U1096

A6-SCM
U1300
U1016
U1064

B0-RFA
U1255
U1096

[cammed goat]

Almost sounds like you had a voltage spike. At least to me, anyway. Any blown fuses? And how long have you been driving the car with the mods on the stock tune?

[pajeff02]

+1 for school! I attended Greg Banish's class and learned a whole lot in a weekend.

Wow. Those are some strange issues. I take it you purchased the car modded and inherited all these issues. I would start by inspecting the wire runs and harnesses, paying particular attention to grounds. Are there aftermarket electrical accessories installed on the car? How old is the battery? Our cars will do some really strange things when there are voltage issues, especially when it is low.

The P1221 is your throttle position sensor -- that is probably what is causing your power reduction. You can use the scanner setup on HP Tuners to view the live sensor data. Could be out of adjustment or just on the blink. Again, look at the wiring and check your "ENG SENS" fuse. Pull the connectors and inspect the pins -- they can easily be bent if some ham handed brute stuffed them together.

Likewise P1551 is commanded throttle position -- most likely tied to the above issue, but as you are probably electronic throttle it could also be an issue with it.

Let us know what you find.

[afattitude]

+1 for school! I attended Greg Banish's class and learned a whole lot in a weekend.

Wow. Those are some strange issues. I take it you purchased the car modded and inherited all these issues. I would start by inspecting the wire runs and harnesses, paying particular attention to grounds. Are there aftermarket electrical accessories installed on the car? How old is the battery? Our cars will do some really strange things when there are voltage issues, especially when it is low.

The P1221 is your throttle position sensor -- that is probably what is causing your power reduction. You can use the scanner setup on HP Tuners to view the live sensor data. Could be out of adjustment or just on the blink. Again, look at the wiring and check your "ENG SENS" fuse. Pull the connectors and inspect the pins -- they can easily be bent if some ham handed brute stuffed them together.

Likewise P1551 is commanded throttle position -- most likely tied to the above issue, but as you are probably electronic throttle it could also be an issue with it.

Let us know what you find.

"I take it you purchased the car modded and inherited all these issues." Hit that on the money!

[pajeff02]

Forgot to mention -- there is a throttle position learning procedure that you can perform with a Tech II.

[afattitude]

I've actually inherited these problems. I havent done anything to the car since it was bought. So...tuning is def a possibility as idk if its been tuned for the mods. Guess i figured you spend nearly 10K in upgrades you would get a tune?? Just seems logical to me, but i know there are people who like to cut corners out there. Well look like I'll be talking to Lethal Performance | San Antonio TX | (210) 656-5220 this month to see what they can do for me.

[cammed goat]

Previous owner probably got in over their head, or it was a forced sale. It happens.