You need to be datalogging ASAP.
Tuning ? Please help....
Thread Starter
Intermediate
Joined: Jan 2012
Posts: 35
Likes: 0
Tuning ? Please help....
I've got an 87 vette that had a cracked block. I had a 350 short block already rebuilt, bored .30 with flat top pistons. 212@.50 or .214@.50 flat tap cam. I had the 113 heads redone put long tube headers on with a 2400 stall. I eliminated air pump, ran true duel exhaust with no cat. Changed the o2 sensor to a 4 wire. I sent the chip to be reprogrammed and installed it. My problem is! It is running rich at idle. when your trying to drive at a steady speed it acts like its running out of gas. Press on the throttle a little and it takes off. It will do this until the SES light comes on! Then it runs like a dream. I don't know how to check the code when the light is on or how to data log. Please tell me what to do! Every time I shut the car off the computer resets.
Last edited by tusairon1; Oct 28, 2013 at 04:00 PM. Reason: Changed wording
Melting Slicks
Joined: Mar 2008
Posts: 2,141
Likes: 76
From: Santa Maria, CA
The connector is under the dash just to the right of the steering wheel. It's rectangular shaped, about 2 inches wide and has 12 pins. Use a paper clip or wire to connect the two upper right hand pins together. Turn the key on. The check engine light should blink. It should first show a Code 12. It will blink once (1) then pause and blink twice (2). The code 12 will be displayed 3 times. The blinks that come after that are the fault codes. For instance, Code 21 will blink twice, pause and blink once. Each fault code will be displayed 3 times. When all codes have been displayed it will repeat code 12.
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
Safety Car
Joined: Jan 2004
Posts: 3,556
Likes: 13
Safety Car
Joined: Jan 2004
Posts: 3,556
Likes: 13
You need datalogging software
Datamaster gives you 20 free logs before you have to buy
Download and install this file for your '87
http://www.mastertune.net/software/D...M-32-setup.exe
This Datamaster guide is for a turbo truck
http://powertuneplus.com/syclone/tunersguide_dm.shtm
( some items shown don't apply to our cars )
but it shows you what the datalog lets you see when you play back the recording
Datamaster gives you 20 free logs before you have to buy
Download and install this file for your '87
http://www.mastertune.net/software/D...M-32-setup.exe
This Datamaster guide is for a turbo truck
http://powertuneplus.com/syclone/tunersguide_dm.shtm
( some items shown don't apply to our cars )
but it shows you what the datalog lets you see when you play back the recording
Racer
Joined: Jun 2013
Posts: 341
Likes: 2
You can do the playback through Datamaster as well.
I think your initial problem is your changes are way outside a normal engine so it's going to take lots of logging, chip burning, more logging, chip burning, etc to get your rig where it needs to be. One and done chip isn't going to cut it. I used the Moates Auto Tune and highly recommend it.
Go you have an adjustable fuel pressure regular? What's your fuel pressure? Did you increase the injectors? Lots of reasons in play to give you performance problems at this point.
When you do the UNI playback open the histogram and click L-term counts to get a good idea of what's going on.
I think your initial problem is your changes are way outside a normal engine so it's going to take lots of logging, chip burning, more logging, chip burning, etc to get your rig where it needs to be. One and done chip isn't going to cut it. I used the Moates Auto Tune and highly recommend it.
Go you have an adjustable fuel pressure regular? What's your fuel pressure? Did you increase the injectors? Lots of reasons in play to give you performance problems at this point.
When you do the UNI playback open the histogram and click L-term counts to get a good idea of what's going on.
Race Director
Joined: Sep 2003
Posts: 16,836
Likes: 337
From: Database Error Indiana
