Please help with an engine problem - 01 C5
Thread Starter
6th Gear
Joined: Nov 2006
Posts: 6
Likes: 0
Please help with an engine problem - 01 C5
I'm a recent corvette owner and I have a problem that recently showed up. Before I go into it, here is some history. I purchased the car (manual) in November with 65k on it and drove it to Texas from New York. Upon getting here my ABS light came on. I took it to the dealer and it was the EBCM of course. Soon after that came the problem I have a question about. When I start the car in the morning my engine revs way up, and when it comes down it gets stuck at 1500 rpms. When I get into first it will rev normally, but whenever I'm not on the gas it will go back up to 1500. The weird part of the whole thing is that if I let the car sit for 4 or 5 minutes it will drop to 800 rpms and work properly. If anyone has any advice I would greatly appreciate it.
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
You need to check and post your DTC's You have a built in code reader:
This is the absolute best C5 Diagnostic Trouble Code (DTC) web site!!!
http://www.corvettedoctor.com/Code_Main.html
http://www.corvettedoctor.com/index.html
Go to “technical data base” and then to “Corvette ECM Computer Codes”. Then select your year car. Read the instructions and then scroll down to the "READ MORE" window to view the code definitions.\
Here is another very good site:
http://www.obd-codes.com/trouble_cod...d-ii-codes.php
Make sure to include the H or C suffix!!
Sound effects are cool too!
Post your codes and then clear them. See which ones come back. Sounds like you have a minor un metered air leak or a TB problem.
BC
This is the absolute best C5 Diagnostic Trouble Code (DTC) web site!!!
http://www.corvettedoctor.com/Code_Main.html
http://www.corvettedoctor.com/index.html
Go to “technical data base” and then to “Corvette ECM Computer Codes”. Then select your year car. Read the instructions and then scroll down to the "READ MORE" window to view the code definitions.\
Here is another very good site:
http://www.obd-codes.com/trouble_cod...d-ii-codes.php
Make sure to include the H or C suffix!!
Sound effects are cool too!
Post your codes and then clear them. See which ones come back. Sounds like you have a minor un metered air leak or a TB problem.
BC
Intermediate
Joined: Jan 2007
Posts: 28
Likes: 0
From: MO
Sounds like you have a vacuum leak. Has the check engine light came on? If you have a vacuum leak the car will rev up until the engine goes into closed loop when the fuel trims take over adding more fuel to compensate for the air leak. Use some brake cleaner and carefully spray around the intake gasket and listen for a change in the engine rpm. This would be my first guess.
Thread Starter
6th Gear
Joined: Nov 2006
Posts: 6
Likes: 0
I ran the diagnostic and this is what I cam up with:
C1214 C H - Solenoid Valve Relay Contact or Coil Circuit Open - Which is of course the dreaded EBCM
C1226 H
C1223 H - Both mean Wheel Speed Sensor Circuit
B0521 H - Tachometer Signal Circuit Malfunction
The only one that came back after I cleared them was the C1214. So my engine light is still on. I will attempt the brake cleaner thing to see what happens. And thank you very much for the websites, I had no idea the computer had a diagnostic option.
C1214 C H - Solenoid Valve Relay Contact or Coil Circuit Open - Which is of course the dreaded EBCM
C1226 H
C1223 H - Both mean Wheel Speed Sensor Circuit
B0521 H - Tachometer Signal Circuit Malfunction
The only one that came back after I cleared them was the C1214. So my engine light is still on. I will attempt the brake cleaner thing to see what happens. And thank you very much for the websites, I had no idea the computer had a diagnostic option.
Tech Contributor
Joined: Oct 1999
Posts: 41,037
Likes: 9,801
From: Charlotte, NC (formerly Endicott, NY)
I ran the diagnostic and this is what I cam up with:
C1214 C H - Solenoid Valve Relay Contact or Coil Circuit Open - Which is of course the dreaded EBCM
C1226 H
C1223 H - Both mean Wheel Speed Sensor Circuit
B0521 H - Tachometer Signal Circuit Malfunction
The only one that came back after I cleared them was the C1214. So my engine light is still on. I will attempt the brake cleaner thing to see what happens. And thank you very much for the websites, I had no idea the computer had a diagnostic option.
C1214 C H - Solenoid Valve Relay Contact or Coil Circuit Open - Which is of course the dreaded EBCM
C1226 H
C1223 H - Both mean Wheel Speed Sensor Circuit
B0521 H - Tachometer Signal Circuit Malfunction
The only one that came back after I cleared them was the C1214. So my engine light is still on. I will attempt the brake cleaner thing to see what happens. And thank you very much for the websites, I had no idea the computer had a diagnostic option.
Since you recently had the EBCM replaced at the dealer I would let them handle the repair to the ABS system. If it is the EBCM again it will be their nickle to fix it. Most dealers provide a 12 mo/12K warranty on any of their repairs.
Bill
