TPI question
Thread Starter
Pro
Joined: Apr 2002
Posts: 621
Likes: 0
From: dripping springs tx
TPI question
I ran the car for the first time with the TPI installed. It idled fine and when in gear it idled at 450 RPM's After driving it for a while when I would stop the engine would idle down and cut off. I could start it back up but if I took my foot off of the gas pedal it would cut off. I took the gas cap off of the gas tank and there was alot of pressure in the tank. I only have a supply and return line to the tank, Does the gas tank suppose to pressurize? My gas cap is vented.
Le Mans Master
Joined: Aug 2003
Posts: 7,720
Likes: 12
From: Chattanooga TN
450 sounds a little low. You may need to adjust your TPS a bit. As far as fuel tank; I have a vented cap, plugged purge line, and just supply and return lines. I have not experienced any odd problems with idle. You do have VSS as I recall. If you can have/can borrow a scanner, make sure you are in park and make sure VSS is reading 0 (sitting still), make sure you are getting a TPS reading.
Thread Starter
Pro
Joined: Apr 2002
Posts: 621
Likes: 0
From: dripping springs tx
It idles fine in park and neutral. 700 RPM. No problem there. It is when it is in gear and I come to a stop that the engine quits. In drive is when it idles at 450 RPM. It will start back up but I have to keep the rpm up when I put it in gear or it will stall out.
Thread Starter
Pro
Joined: Apr 2002
Posts: 621
Likes: 0
From: dripping springs tx
Yes I believe so. It is a 122727 which is water proof and heat resistant.
The setup I bought from someone that was selling it. It was a complete setup from FIC.It is also an automatic.
The setup I bought from someone that was selling it. It was a complete setup from FIC.It is also an automatic.
Le Mans Master
Joined: Aug 2003
Posts: 7,720
Likes: 12
From: Chattanooga TN
Originally Posted by Veet 66
It idles fine in park and neutral. 700 RPM. No problem there. It is when it is in gear and I come to a stop that the engine quits. In drive is when it idles at 450 RPM. It will start back up but I have to keep the rpm up when I put it in gear or it will stall out.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
Thread Starter
Pro
Joined: Apr 2002
Posts: 621
Likes: 0
From: dripping springs tx
I believe my problem is in setting the TPI up. I didn't know all the steps it takes just to set it up until now. Timing, jumping dianostic plug, setting the IAC and Air flow sensor. SHEE.
On the park/neutral switch I thought that it speeds up the idle in park and neutral only? When the switch is in park/neutral doesn't it ground out. Then when you put it in gear the switch circuit opens?
On the park/neutral switch I thought that it speeds up the idle in park and neutral only? When the switch is in park/neutral doesn't it ground out. Then when you put it in gear the switch circuit opens?
Le Mans Master
Joined: Aug 2003
Posts: 7,720
Likes: 12
From: Chattanooga TN
Park neutral speeds up the idle in gear. It expects a ground to the ECM in park or neutral. If you ground this all the time, you will have issues-and it defeats the purpose of VSS input. You likely have to use a relay to get this ground signal from the neutral safety switch on the shifter.
Thread Starter
Pro
Joined: Apr 2002
Posts: 621
Likes: 0
From: dripping springs tx
I have a seperate park/neutral switch. It is mounted on the trans. and has a lever that is attached to the shifter rod.
Let me make sure I am reading this correctly. When the trans. is in park or neutral the switch is grounded. When it is in gear it is open. (no ground) If this is correct this is how it is working now.
Thanks for your help.
Let me make sure I am reading this correctly. When the trans. is in park or neutral the switch is grounded. When it is in gear it is open. (no ground) If this is correct this is how it is working now.
Thanks for your help.
Le Mans Master
Joined: Aug 2003
Posts: 7,720
Likes: 12
From: Chattanooga TN
Originally Posted by Veet 66
I have a seperate park/neutral switch. It is mounted on the trans. and has a lever that is attached to the shifter rod.
Let me make sure I am reading this correctly. When the trans. is in park or neutral the switch is grounded. When it is in gear it is open. (no ground) If this is correct this is how it is working now.
Thanks for your help.
Let me make sure I am reading this correctly. When the trans. is in park or neutral the switch is grounded. When it is in gear it is open. (no ground) If this is correct this is how it is working now.
Thanks for your help.
Le Mans Master
Joined: Aug 2003
Posts: 7,720
Likes: 12
From: Chattanooga TN
Originally Posted by Veet 66
Thanks for the info. What has everyone been running the RPM in neutral? Also in gear?
