82 ecu rebuild ?
Burning Brakes
Joined: Feb 2013
Posts: 1,062
Likes: 28
From: Burkburnett TX
I also went with a new hypertech prom. I didn't want to take the chance that my old prom would damage the new ecm. My old prom was installed backwards by the previous owner anyway... Pay GOOD attention to how the prom goes and make sure its right or you might fry them.
Thread Starter
Racer
Joined: Feb 2007
Posts: 337
Likes: 1
From: Clyde Ohio
Let us know if this fixes you problem....Now I have another problem. Gf's 6 yr daughter did me a favor and threw 2 actuator springs in the trash. Anyone have the 2 inner, longer and narrow springs they'd like to sell ? At least the girl likes being in the shop with me lol.
Race Director
Joined: Apr 2009
Posts: 19,294
Likes: 2,753
From: Charlotte NC
Let us know if this fixes you problem....Now I have another problem. Gf's 6 yr daughter did me a favor and threw 2 actuator springs in the trash. Anyone have the 2 inner, longer and narrow springs they'd like to sell ? At least the girl likes being in the shop with me lol.
DUB
Thread Starter
Racer
Joined: Feb 2007
Posts: 337
Likes: 1
From: Clyde Ohio
Yes headlight, suppose I should've proofed my response before posting. I have found several available but can't justify spending 15 on shipping a 2 spring. Was hoping someone would throw a couple in a priority mail envelope..
4th Gear
Joined: Mar 2014
Posts: 4
Likes: 0
From: Gainesville VA
Switched to 84 ecm and chip
Autozone has a Cardone 82 ecm for about $97 with a $60 core and free shipping. Just ordered mine. Tired of chasing a code 42 EST. Repair shop that I go to looked up my problem on Identifix (shops subscribe to this) and it described my problem exactly. New ignition module and distributor wiring but still throwing code 42 most likely a bad ecm.
Thread Starter
Racer
Joined: Feb 2007
Posts: 337
Likes: 1
From: Clyde Ohio
Back at it. Took a good drive today and she ran pretty good, fixed the vacuum leak in the headlight system, that brought the idle to 700 in P, now what is happening though when put in gear holding the brake the RPM wants to push to 800 and if you put back in park it'll hit 1100 and slowly idle down, SLOWLY. So going into gear making it rise, where would the leak be ? I know the intake isn't leaking or the headlight system. I'm done for the night , will have to check tomorrow and it threw the engine light too so have to check that code. But is there something going to the tranny that is know for vacuum leaks also that would cause this to rise in gear ?
Melting Slicks
Joined: Jul 2005
Posts: 2,740
Likes: 3
From: Aurora Ontario
Back at it. Took a good drive today and she ran pretty good, fixed the vacuum leak in the headlight system, that brought the idle to 700 in P, now what is happening though when put in gear holding the brake the RPM wants to push to 800 and if you put back in park it'll hit 1100 and slowly idle down, SLOWLY. So going into gear making it rise, where would the leak be ? I know the intake isn't leaking or the headlight system. I'm done for the night , will have to check tomorrow and it threw the engine light too so have to check that code. But is there something going to the tranny that is know for vacuum leaks also that would cause this to rise in gear ?
Jim
Last edited by jdp6000; Apr 6, 2014 at 07:50 PM.
Thread Starter
Racer
Joined: Feb 2007
Posts: 337
Likes: 1
From: Clyde Ohio
I know it's not the tps cause that was checked...I will check the balance on the tbi's. Damn this is kicking my ***, I'm sure it's something simple .. It seemed odd the idle climbed when put in gear and to be honest I know nothing about the 700r tranny but remember reading something about them causing a vacuum leak somewhere. I can't find that post though.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
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
Burning Brakes
Joined: Feb 2013
Posts: 1,062
Likes: 28
From: Burkburnett TX
I don't see how 700r4 could cause a vac leak. I set my tps 3 times. Each time it was reading a bit different. Also try blocking off the vacuum to your brake booster. The idle climbing could be coinciding with your foot being on the brakes and a possible leaky brake booster. Had that on a few cars before.
Melting Slicks
Joined: Jul 2005
Posts: 2,740
Likes: 3
From: Aurora Ontario
I know it's not the tps cause that was checked...I will check the balance on the tbi's. Damn this is kicking my ***, I'm sure it's something simple .. It seemed odd the idle climbed when put in gear and to be honest I know nothing about the 700r tranny but remember reading something about them causing a vacuum leak somewhere. I can't find that post though.
It will something simple.
Thread Starter
Racer
Joined: Feb 2007
Posts: 337
Likes: 1
From: Clyde Ohio
I'm going to recheck the tps and makes sense with maybe a leaking booster or line going to it. But with the brake pedal depressed it doesn't raise, it's only when the tranny is shifted into gear . I know nothing about the 700r. I will check all the above this week, check the balance of the throttle bodies and let you know.
Thread Starter
Racer
Joined: Feb 2007
Posts: 337
Likes: 1
From: Clyde Ohio
Solved a few problems. After asking about my gear ratios and the RPM's I raised the car and did a quick tire spin , I have the 2.87's still. So why the high RPM ? Lets see, high RPM, high Idle. Checked the RPM's with a timing light, Tach is off. Guess I need to look into a tach board.
Instructor
Joined: Aug 2004
Posts: 106
Likes: 1
I know it's an old thread. I also read that the '84 ecm (with an '84 prom) improved the idle and drivability. That, and that maybe the '84 ecm does not trigger the under hood fresh air solenoid? Any idea? I picked up an '84 ecm and was going to try it out.
Last edited by 6mn Vette; Jun 4, 2021 at 06:13 PM.
Safety Car
Joined: Nov 2005
Posts: 3,532
Likes: 1,185
From: Arizona - If you don’t know CFI, STOP proliferating the myths around it...
Yeah! This thread is dead from old age...Save your money and just buy the EBL Flash II from Dynamic EFI. It will make your 82/84 CFI 100% laptop tunable. It gets better, if it is stock I have a great stock tune BIN file as a starter that works very nicely and give it out for free with every HAM board.
Last edited by Buccaneer; Jun 4, 2021 at 06:18 PM.
Administrator
Joined: Jul 2000
Posts: 53,981
Likes: 6,207
From: About 1100 miles from where I call home.
When you post to a thread from 7 years ago and the first thing you type is “I know its an old thread,” thats an indication you should start a new thread.