Bubbling Coolant Header Tank

Steven Smith

Steven Smith

CCCUK Member
teamzr1 said:
For 1986 C4 only what I can touch and change in the GM calibration
But uses the same sized E-prom of 27C128 that the 1989 uses

ECM Switch Parameters

VATS Select
Base PW Calibration Method (X = Calc.)
Normally Open Fan Request Input
Manual/Auto Transmission, X = Manual
Overdrive Default Off/On (X = On)
Use TCC Output for Shift Light
No Ref. Pulse Diagnostic (Err 12)
O2 Sensor Diagnostic (Err 13)
CTS Sensor High Diagnostic (Err 14)
CTS Sensor Low Diagnostic (Err 15)
TPS Sensor High Diagnostic (Err 21)
TPS Sensor Low Diagnostic (Err 22)
MAT Sensor Low Diagnostic (Err 23)
Vehicle Speed Diagnostics (Err 24)
MAT Sensor High Diagnostic (Err 25)
EGR Diagnostics (Err 32)
MAF High Diagnostics (Err 33)
MAF Low Diagnostic (Err 34)
Burn Off Diagnostic (Err 36)
Cyl. Select Diagnostic (Err 41)
EST Monitor Diagnostic (Err 42)
Knock Diagnostics (Err 43)
O2 Sensor Lean Diagnostic (Err 44)
O2 Sensor Rich Diagnostic (Err 45)
VATS Diagnostics (Err 46)
Missing Cal Pack (Err 52)
Over Voltage Diagnostic (Err 53)
Fuel Pump Voltage (Err 54)

ECM Constants
Initial Spark Advance
Max Spark Advance
Cool. Comp. Spark Spark Bias
Highway Mode Spark Enable Coolant Temp.
Highway Mode Spark Max Load Threshold
Highway Mode Spark Enable RPM Treshold
Highway Mode Spark Enable Delay Time
Knock Retard Enable RPM Threhold
Knock Retard Enable MPH Threhold
Knock Retard Enable Cool. Temp. Thresh.
Max Knock Retard (Not in P.E.)
Default Knock Retard if MALF 43
Fuel Cut Off Vehicle Speed
Fuel Resume Vehicle Speed
Fuel Cut Off RPM
Fuel Resume RPM
Fan On Coolant Temp Threshold (A/C On)
Fan Off Coolant Temp Threshold (A/C On)
Fan On Coolant Temp Threshold (A/C Off)
Fan Off Coolant Temp Threshold (A/C Off)
Injector Flow Rate - Single Fire
Injector Flow Rate - Double Fire
Max Accel. Enrich. Async Pulse Width
Minimum Delta TPS For Accel. Enrich.
Minimum Delta LV8 For Accel. Enrich.
Closed Loop Fuel Enable Cool. Temp.
Hot O2 Timer
Warm O2 Timer
Cold O2 Timer
Maximum BLM Value
Minimum BLM Value
Min. Coolant Temp for BLM Update
Max. Coolant Temp for BLM Update
Fast O2 R/L Hysteresis
Fast O2 R/L Hysteresis - Air Diverted
Decel Enlean Enable Delta TPS Thresh.
Decel Enlean Enable Delta LV8 Thresh.
Decel Enlean BPW Multiplier
MAF High Diagnostic (Error 33) Threshold
EGR Off (%TPS)
EGR On (%TPS)
Min. MAT to Enable EGR
TCC Unlock Speed (Low Gears)
TCC Lock Speed (Low Gears)
TCC Unlock Speed (High Gears)
TCC Lock Speed (High Gears)
TCC Unlock Prevent/Auto O/D Engage Speed
TCC Enable Coolant Temp. Threshold
Min. Load Limit for TCC Lock, Low Speed
Min. Load Limit for TCC Lock, High Speed
TCC Min Load Limit Hysteresis
TCC Min Load Limit High/Low Speed Thresh
Shifter Kickdown Prevent RPM Threshold
TPS Kickdown/TCC Unlock Prevent -1st Gr.
TPS Kickdown/TCC Unlock Prevent-Not 1st
Idle Speed Adder in Park/Neutral
Idle Speed Adder for A/C On
IAC Startup Park Position
IAC Startup Delay Time
IAC Control Deadband RPM Error (in P/N)
IAC Control Deadband RPM Error (Drive)
IAC Steps added to Warm Park, A/C On
IAC Steps added for Cold Engine
IAC Gain Scalar for Prop & Deriv (P/N)
IAC RPM Rate Deadband, Idle Stability
DFCO Enable RPM Threshold
DFCO Disable RPM Threshold
DFCO Enable LV8 Threshold
DFCO Disable LV8 Threshold
DFCO Disable TPS Threshold
DFCO Disable MPH Threshold
DFCO Enable Cool Temp Threshold
DFCO Throttle Follower Default %TPS
DFCO Stall Saver T/F %TPS Correction
DFCO Stall Saver T/F %TPS Corr. Duration
DFCO Stall Saver Async Inj. Pulse Width
DFCO Stall Saver Async Inj. Pulses
Stall Saver Spark Correction Enable RPM
Stall Saver Spark Correction Disable RPM
Throttle Follower Step Period - in P/N
Throttle Follower Step Period - in Drive
T/F Step Period Correction Vs. Speed
T/F Step Period Correction in O/L Idle
Throttle Follower Slope Gain
Max. Throttle Follower Steps - in Drive
P/N Throttle Follower Multiplier
Closed Loop Idle Enable Vehicle Speed
Throttle Follower Adder - Vehicle Moving
AIR Control Enable Coolant Temp.
Shift Light Enable Coolant Temp. Thresh.
Shift Light Enable Vehicle Speed Thresh.
Shift Light Enable %TPS Threshold
Shift Light Enable LV8 Threshold
Shift Light Enable RPM Threshold
Shift Light Disable RPM Threshold
Shift Light Force On RPM Threshold
Shift Light Force On Disable RPM Thresh
Number of Cylinders
Display Injector Flow Rate

Tables
ECM Switch Table
ECM Constant Table
Main Spark Advance Vs. RPM Vs. Load
Cool. Comp. Spark Adv. Vs. RPM Vs. Cool. Temp.
Highway Mode Spark Advance Vs. Load
Startup Spark Advance Vs. Startup Cool. Temp.
Startup Spark Advance Decay Delay Vs Startup Cool.
Startup Spark Adv. Decay Period Vs. Startup Cool.
Startup Spark Adv. Decay Step Vs. Startup Cool.
Knock Retard Attack Rate Vs. RPM
Knock Retard Recovery Rate Vs. RPM
Max Knock Retard in WOT
WOT %Change To Fuel/Air Ratio Vs. Coolant Temp.
WOT %Change To Fuel/Air Ratio Vs. RPM
%TPS To Enable WOT Vs RPM
Open Loop Fuel/Air Ratio %Change Vs. Coolant Temp.
Open Loop Fuel/Air Ratio %Change Vs. Load
Startup Fuel/Air Ratio %Change Vs. Coolant Temp.
Warm IAC Park (Steps) Vs. Coolant Temp.
Desired Idle Speed vs Coolant Temp.
Mass Air Flow Table #1
Mass Air Flow Table #2
Mass Air Flow Table #3
Mass Air Flow Table #4
Mass Air Flow Table #5
Mass Air Flow Table #6
Max. Air Flow Vs. RPM
BPW Fuel Table Vs Load Vs RPM
Injector PW Correction Vs. Battery Voltage
Accel. Enrich %BPW Factor Vs Async Pulse
No. of Accel Enrich Async Pulses Vs. Coolant Temp.
Accel. Enrich. Async Factor Vs. Coolant Temp.
LV8 Accel. Enrich. Factor Vs. Delta LV8
LV8 Accel Enrich Coolant Factor Vs. Coolant Temp.
LV8 Accel. Enrich. Decay Rate Vs. Coolant Temp.
Crank Fuel Pulse Width Vs. Coolant Temp.
Crank Fuel Multiplier Vs. Reference Pulses
Crank Fuel Pulse Width Multiplier Vs. TPS
BLM Cell RPM Boundaries
BLM Cell MAF Boundaries
Fast O2 Rich/Lean Threshold Vs. MAF
Rich/Lean O2 Count Offset Vs. Coolant Temp.
Upper Zero Error Reference for Slow O2 R/L Vs. MAF
Lower Zero Error Reference for Slow O2 R/L Vs. MAF
Fan PWM Duty Cycle Vs. Coolant Temp.
EGR % Duty Cycle Vs. LV8 Vs. RPM
TCC Unlock %TPS (Not In 4th) Vs. MPH
TCC Lock %TPS (Not In 4th) Vs MPH
TCC Unlock %TPS (In 4th) Vs MPH
TCC Lock %TPS (In 4th) Vs MPH
Shift Light On %TPS Threshold Vs. RPM
Shift Light Off %TPS Threshold Vs. RPM
Shift Light On Delay Time Vs. %TPS
Click to expand...
So apart from the E-Prom reader is there anything else needed to change settings in the E-Prom ?
Would Tuner Pro be able to do the software side of it ?
 
teamzr1

teamzr1

Supporting vendor
If you decide to do all the tuning yourself rather than someone like me and you doing the E-prom burning
Go here TunerCat

Select the OBDI Tune Kits, then the (Newer Vehicles) as that one supports C4 model years
It comes with the burner, cables and tuning software
Cost shows as $270 and another $30 to ship to the UK
It comes with a flash chip instead of a E-prom, so it could be flashed many times

Just be sure to watch your tuning changes as the wrong ones you decide on could make the engine a brick

Also suggest getting the full OBD-1 scanner, this comes with software working on an MS-Windows P/C
cables and interface
Select Datacat from the main menu, cost $135

This allows to read and clear error codes, scan and record engine and auto tranny functions
Recordings can be replayed or emailed to like me to fully analyze all the data to know than how to slant the tune for best functioning and performance and also to export the recorded data and put into a spreadsheet like Excel to examine how engine is running

You could download the scanner software now to go through all the modes and functions and after buying they email you your license
 
Steven Smith

Steven Smith

CCCUK Member
teamzr1 said:
If you decide to do all the tuning yourself rather than someone like me and you doing the E-prom burning
Go here TunerCat

Select the OBDI Tune Kits, then the (Newer Vehicles) as that one supports C4 model years
It comes with the burner, cables and tuning software
Cost shows as $270 and another $30 to ship to the UK
It comes with a flash chip instead of a E-prom, so it could be flashed many times

Just be sure to watch your tuning changes as the wrong ones you decide on could make the engine a brick

Also suggest getting the full OBD-1 scanner, this comes with software working on an MS-Windows P/C
cables and interface
Select Datacat from the main menu, cost $135

This allows to read and clear error codes, scan and record engine and auto tranny functions
Recordings can be replayed or emailed to like me to fully analyze all the data to know than how to slant the tune for best functioning and performance and also to export the recorded data and put into a spreadsheet like Excel to examine how engine is running

You could download the scanner software now to go through all the modes and functions and after buying they email you your license
Click to expand...
Wow that sounds more complicated than I thought and would be of limited use in the long run.
VATs would be nice to turn off, but I have bypassed the key switch already as it was worn.
I have the single engine fan coming on at around 90°c via a additional thermostatic controller.
Would be nice to get a tune to take advantage of the mods I have already done, Tri-Y headers, de-cat, straight through exhaust, air box mod, and better air filter.
Smog pump delete is on my to do list.
 
teamzr1

teamzr1

Supporting vendor
Bypass is OK unless it fails and worse is your on the road and stuck
Turning off VATs in tune is a clean way to do it.
Get rid of all the smog system, cleans up engine bay, reduce some weight :) and with your other mods
would be best to tune for that and with the OBD-1 scanner would know how to adjust for best fuel AFR and increase
timing for better HP/Tq numbers along with commanding fans on sooner
 
A

Andrew

CCCUK Member
Thanks to your advice I tackled these jobs today:

GOOD RESULTS FROM TODAYS HOME MECHANICING: I replaced the oil, oil filter, coolant, fitted the new thermostat (180°) as recommended by you guys.
1734979590338.png

THINGS I BROKE: I managed to break this black plastic pipe in 2 places (t'was very brittle!) and lose the connector to the throttle body. This black pipe heads off towards the front left of the car under the pop up light (opposite side to the header tank)
1734978731266.png

at the other end of the pipe i finished the job by losing the pipe connector bit where it joins to the throttle body. it obviously sucks something! see photo:

1734978928726.png

Please can you kindly tell me what are these parts called that ive broken/lost please?:) (plastic pipe?) so i can get replacement ones.
Can i drive around without the pipe in place? (im guessing not as It seems to run rough as a bears bottom without the pipe.:whistle:)

Also- may i ask will not having a radiator coolant level sensor for the tie being (which pops in rad) upset the ECU?

1734979634328.png
 
Steven Smith

Steven Smith

CCCUK Member
Andrew said:
Thanks to your advice I tackled these jobs today:

GOOD RESULTS FROM TODAYS HOME MECHANICING: I replaced the oil, oil filter, coolant, fitted the new thermostat (180°) as recommended by you guys.
View attachment 28845

THINGS I BROKE: I managed to break this black plastic pipe in 2 places (t'was very brittle!) and lose the connector to the throttle body. This black pipe heads off towards the front left of the car under the pop up light (opposite side to the header tank)
View attachment 28843

at the other end of the pipe i finished the job by losing the pipe connector bit where it joins to the throttle body. it obviously sucks something! see photo:

View attachment 28844

Please can you kindly tell me what are these parts called that ive broken/lost please?:) (plastic pipe?) so i can get replacement ones.
Can i drive around without the pipe in place? (im guessing not as It seems to run rough as a bears bottom without the pipe.:whistle:)

Also- may i ask will not having a radiator coolant level sensor for the tie being (which pops in rad) upset the ECU?

View attachment 28846
Click to expand...
Looks like you broke a vacuum hose, if it is just get some new hose.
If it is the level sensor will just show low coolant to my knowledge.
 
teamzr1

teamzr1

Supporting vendor
I can only guess without seeing the engine but
The hose going to like below the left headlight would be from the smog pump ?

The other hose is either the PCV system hose or if that hose goes to the radiator it would be to flow hot coolant through the throttlebody
to prevent it from freezing up in cold winter weather
Any correct size of hose would be fine to replacing the bad ones.

If in fact that sensor is only for low coolant level, it would not affect the ECM as to engine being driven
But my question is, where is the old low coolant sensor, is it still screwed into the new radiator and if
so when replacing it then you'd have to drain coolant out of radiator to install new one

In replacing the Tstat there will be air pockets in the coolant system so odd temps will be reported
so you need to purge that air out with some cold and hot engine running and turn heater on full blast to get the coolant flowing through
complete system
 
A

Andrew

CCCUK Member
Thanks JR-the old low coolant sensor clips are strangely burnt but maybe would work okay- it does pop into the new radiator loosely but not securely. doesnt seem to seal. Shall i drain down to that level and bond it in with something? or order new one?
 
A

Andrew

CCCUK Member
Okay- so its a pre heater device for the throttle body- thank you both. I will look for a mini hose in a hardware shop/homebase/screwfix
 
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