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Tech Talk Technical Discussion About The Nissan 240SX and Nissan Z Cars


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Old 09-21-2004, 09:54 PM   #1
indy240
 
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newly HELP, SERIOUSLY, buit ka24e, question about computer, etc..

I just finished building a ka24e, since i blew it up and didn't have enough money to do an sr. I had the cam line honed, racing rings, bearings etc.. I have put an injen intake on it and headers, as far as external bolt on's go. Before i put it in i cleaned out the aiv. The motor has not been timed w/ a light yet, but yesterday during my 30 min. initial run, and after an oil change and filter change, i drove it a few miles. Every thing was alright. Today i fired it up and it sounded like it was either missing bad or running on 3 cyl's. I as wondering if the computer will take a while to figure out what i did to the motor, or what. Kinda lost right now, if anyone may have an idea about what is going on, pleas let me know. Any help is appreciated. Thanks, Kris
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Old 09-21-2004, 10:03 PM   #2
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Vehicles equipped with engine or transmission computers may
require a relearn procedure after vehicle battery is disconnected.
Many vehicle computers memorize and store vehicle operation patterns
for optimum driveability and performance. When vehicle battery is
disconnected, this memory is lost. The computer will use default data
until new data from each key start is stored. As computer memorizes
vehicle operation for each new key start, driveability is restored.
Vehicle computers may memorize vehicles operation patterns for 40 of
more key starts.
People often complain of driveability problems during
relearn stage because vehicle acts differently then before being
worked on. The following complaints (driveability problems) may exist:
* Harsh Or Poor Shift Quality
* Rough Or Unstable Idle
* Hesitation Or Stumble
* Rich Or Lean Running
* Poor Fuel Mileage
These symptoms and complaints should disappear after a number
of drive cycles have been memorized. If a specific relearn
procedure is not available, the following procedure may be used:
Automatic Transmission
* Set parking brake, start engine in "P" or "N" position.
Warm-up vehicle to normal operating temperature or until
cooling fan cycles.
* Allow vehicle to idle for one minute in "N" position. Select
"D" and allow engine to idle for one minute.
* Accelerate at normal throttle position (20-50%) until vehicle
shifts into top gear.
* Cruise at light to medium throttle.
* Decelerate to a stop, allowing vehicle to downshift, and use
brakes normally.
* Process may be repeated as necessary.
Manual Transmission
* Place transmission in Neutral position.
* Ensure emergency brake has been set and all accessories
are turned off.
* Start engine and bring to normal operating temperature.
* Allow vehicle to idle in Neutral for one minute.
* Initial relearn is complete: process will be completed during
normal driving.
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Old 09-23-2004, 05:30 PM   #3
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Thanks for the info. on computers, i'm going to go try it and see what happens.
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Old 09-24-2004, 10:21 PM   #4
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Found my problem. The second cylinder had corrosion on the harness plug for the injector, cleaned it off and i'm running smoothly on 4 cylinders again. Thanks for the help and the computer info.
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