OBD SCAN RESULTS

[James velez]

I HAVE A 1985' HOTAIR GN, BRAND NEW EVERYTHING!! MOTOR, COMPONENTS ETC. I ALSO, IN THE PROCESS OF RENEWING, UPGRADED TO 60LB-ERS, AND A COMPLETE 87' ECM CONVERSION IE: MAF, MAP, TRANSLATOR, IGNITION MODULE, IAT SENSOR AND A TT CHIP BURNED FOR THE NEW COMBO. HOWEVER, I DID NOT REPLACE ANY OF THE PRE EXISTING SENSORS AND HARNESS ETC. I AM NOW SINCE THE REBUILD HAVING A PROBLEM STARTING THE CAR. IT TURNED OVER ONCE AND RAN BEAUTIFULLY THE FIRST TIME WE TRIED, BUT SINCE THEN HAS NOT BEEN ABLE TO RESTART. IT JUST TURNS AND TURNS AND TURNS. IT WANTS TO START, BUT IT JUST DOESN'T. WHICH BRINGS ME TO MY REASON FOR REACHING OUT TO YOU ALL. MY BUDDY RAN AN OBD SCAN AND HERE WERE THE RESULTS:

- IAC- SYSTEM PROBLEM, CANNOT SET DESIRED RPM OR ISA- IDLE SPEED ACTUATOR, CARB SYSTEM PROBLEMS.
- ECM FAULT OR O2 SENSOR CIRCUIT FAIL (RICH LEFT/ LEAN LEFT)
- ESC- ELECTRONIC SPARK CONTROL CIRCUIT PROBLEMS
- EST ELECTRONIC SPARK TIMING CIRCUIT (LOW VOLTAGE DETECTED)

BEAR IN MIND NOW ALL THE PLUG WIRE CONNECTIONS , IGNITION MODULE CONNECTIONS AND EVERYTHING ELSE IS INSTALLED PROPERLY AND TRIPLE CHECKED. WE ALSO DOUBLE CHECKED CAM TIMING WAS CORRECT AND IT IS AND ATTEMPTED TO USE A CAM SENSOR TOOL TO MAKE SURE THE SENSOR WAS PROPERLY SET. CAM SENSOR TOOL LED WOULD NOT LIGHT UP WHEN TRYING TO SET. NOT SURE IF THAT IS THE FAULT OF THE TOOL OR THE SENSOR. TOOL WAS BRAND NEW OUT OF THE PACKAGE.

THAT ALL BEING SAID, I WOULD GREATLY APPRECIATE ANY ADVICE AND OR HELP AS TO WHAT MY NEXT STEPS SHOULD BE TO SOLVE THIS PROBLEM. THIS HAS BEEN A LONG AND FRUSTRATING ROAD RESTORING HER AND I KNOW I'M IN THE HOME STRETCH. PLEASE HELP ME OUT!!!!!!!! THANKS IN ADVANCE GUYS.

 

[fast86gn]

James it's been 7 days since your post has anything changed? I wished I could help you but that is way over my head. Maybe someone that knows will chime in? Good luck

 

[Shamusvelez]

Just checking back in. Tried Caspers cam sensor fix module. Didn't start. I don't think it's the cam sensor. I was told by a good GN mechanic to replace the crank sensor? Just to refresh everyones memory, the motor is turning and wants to start but just won't. Have spark, have fuel. What does the crank sensor do?

 

[Shamusvelez]

Just checking back in. Tried Caspers cam sensor fix module. Didn't start. I don't think it's the cam sensor. I was told by a good GN mechanic to replace the crank sensor? Just to refresh, the motor is turning and wants to start but just won't. Have spark, have fuel. What does the crank sensor do?

 

[Shamusvelez]

Just checking back in. Tried Caspers cam sensor fix module. Didn't start. I don't think it's the cam sensor. I was told by a good GN mechanic to replace the crank sensor? Just to refresh everyones memory, the motor is turning and wants to start but just won't. Have spark, have fuel. What does the crank sensor do?

 

[aminga]

Just checking back in. Tried Caspers cam sensor fix module. Didn't start. I don't think it's the cam sensor. I was told by a good GN mechanic to replace the crank sensor? Just to refresh everyones memory, the motor is turning and wants to start but just won't. Have spark, have fuel. What does the crank sensor do?

If the plugs are firing it's not the crank sensor

 

[dennisL]

Have spark, have fuel. What does the crank sensor do?

During cranking, the ECM needs to see both pulses (cam and crank). After it sees both pulses, it uses the crankshaft signal as a reference for when to pulse the injectors. All six injectors are pulsed at the same time (simultaneously) unlike normal run mode when they are pulsed one-at-a-time (sequentially). Every 3rd reference pulse from the crankshaft sensor causes the injectors to squirt fuel.

 

[aminga]

The crank sensor is the firing pulse. The cam sensor is only used on start up to sync to the right cylinder. (Find the start of the firing sequence). Once the engine is running the cam sensor can be unplugged.

 

[bogies87]

Were the 60's new? I had an 87 do the same to me after a cam change. Ended up being the injectors/ injector was at fault.
Also if you have been cranking to no avail the plugs may be a little wet. It may end up being as easy as a plug change.
As far as the codes go if it were mine i would clear them and start from scratch. Try starting and see if it sets any new codes.

 

[Shamusvelez]

60'S ARE BRAND NEW, CODES WERE CLEARED FIRST AND THEN THREW THE AFOREMENTIONED. STILL IN THE PROCESS OF PUTTING IN A NEW CRANK SENSOR AND CAM SENSOR CAP AS WELL. OLD ONES WERE LOOKING A LITTLE TIRED SO. JUST A PROCESS OF ELIMINATION AT THIS POINT! SOONER OR LATER SHE'LL GO. THANKS FOR ALL THE INFO AND INPUT GENTLEMEN. MUCH APPRECIATED! WILL CHECK BACK IN WHEN I HAVE MORE TO ADD.

 

[Shamusvelez]

Quick question. When replacing the ignition with the 86-7 setup i just installed the coil pack adapter from caspers that only connects the module to the harness, but I just noticed they also sell another setup that also has the coil pack adapter but also has two other cables, one I believe connects to the battery and one other that looks like some sort of relay or sensor. This is what it states,
This “Plug And Play” harness assembly is designed to provide necessary power to the coils when
converting a pre-intercooled turbo ignition system (1984-1985) to the readily-available CCCI system
used on the intercooled turbo 3.8L engines – OEM ignition system for the 1987 Buick turbo 3.8L.
The early turbo wiring using the Magnavox CCCI used a resistance wire in the harness which fed the
coils. This resistance wire effectively reduces the available power to the coils – which was needed
with the early CCCI system - and when you use the 87-style coil system, the available power is cut
back significantly. The use of the 102084 Hotwire Kit will provide full power needed for proper spark
under boost.
Couls this be part of the problem im having turning over? Not sure if anyone is familiar with the differences or if the other wires are even necessary.