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Post by samanthasdad on Apr 12, 2006 11:23:57 GMT -3
ok, I just modified my 2003 Jeep Wrangler X with:
AEM Dry flow intake & Borla cat-back exhaust. I made sure every bolt and screw was snug and now, I have my engine light on. Error Code 1290 appeared, which states that the Compressed Natural Gas system pressure is above normal operating range. Any suggestions?
Thank you
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Post by slab42 on Apr 12, 2006 14:29:11 GMT -3
natural gas huh? are you sure you were not reading the manual for the stove? lol let me check on it, and let you know.
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Post by slab42 on Apr 12, 2006 14:35:23 GMT -3
ok, my OBDII says that P1290 is "manufac. cont. air fuel metering" translated in english... your air fuel ratio is off, you are probably runnin a little lean or something. I have no idea how to correct that, I am sure someone here can tell you.
HTH
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Post by chrometj on Apr 12, 2006 15:18:14 GMT -3
disconnect the battery for like 15 mins, the computer has to learn how to work with the new mods
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Post by njhcx4xlife on Apr 12, 2006 22:54:46 GMT -3
just disconnecting the battery doesn't re-set the computer. I am not positive by any means so feel free to correct me if I'm wrong but I stole this from ROF...
"Forced Flash
This very simple procedure will Erase the “Adaptive Memory” stored inside the TJ PCM and allow a new “Adaptive Memory” to be developed.
After performing this procedure the PCM will re-learn and store into Adaptive Memory your engines performance characteristics.
[L]Disconnect the POSITIVE battery Terminal and touch it to ground for 30 seconds. (This is to discharge the PCM capacitors, which maintain the Adaptive Memory. Reconnect the Battery Cable Turn Ignition Switch to the “On” position but DO NOT start the engine Turn Headlight “On” Turn Headlights “Off” Turn Ignition Key “Off”[/L]
Adaptive memory has nor been flashed, or erased from the PCM.
When you start the engine it will be running off a set of pre-programmed tables that come with the PCM from the factory.
When you get the engine up to operating temperature the PCM will start to collect data for the “Adaptive Memory”.
The PCM will collect data for Adaptive Memory for the first 50 Warm-up Cycles.
Warm-up Cycle
A warm-up cycle happens when all of the following conditions exist.
Engine is running A raise of 40F in engine temperature must occur ABOVE the engine temperature at start-up Engine Coolant Temp must reach at least 160 F.
Once your engine has gone through 50 warm-up cycles in at least a 500-mile distance the PCM adaptive memory is set. It WILL NOT Change unless you flash it out and start all over again."
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Post by chrometj on Apr 12, 2006 23:56:34 GMT -3
or...
autozone scans for free, im sure they have the tool to plug into obd2 to flash your computer, its literally a 3 min process, and then you dont have to go through all these steps
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Post by slab42 on Apr 13, 2006 11:31:07 GMT -3
he is not talking about removing the check engine light mike, that can be cleared easy (with OBDII tool) he is talking about flashing the PCM to remove the map or "program" that tells the engine how much fuel to put in at what throttle position at what RPM, etc. if you flash the PCM, and it goes into the adaptive learning mode that he described, it will basically start learning the car's behaviors and needs with the new intake, etc. and over the course of 50 "lessons" it will calibrate itself for the new equipment. does that make sense?
another way (quicker, but more costly) is have your jeep dyno tuned with the new mods. there are shops out there that can remap your PCM for you, so your jeep doesn't do the thinkin. they plug a very expensive tool into your jeep, and put it on a dyno (also not cheap) and do test runs to determine where it is lacking or delivering too much fuel, etc., and adjust it, and throw it on the dyno again, then adjust it again. since the dyno, computer and their time is not cheap, it may be too expensive. find a shop, and ask how much.
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Post by laybackman on May 4, 2006 17:48:22 GMT -3
To dump the adaptive memory in the PCM disconnect all the leads on the positive battery post and touch them to a good ground for at least thirty seconds. That drains the capacitors in the PCM that stores the adaptive memory. Niow the jeep will run on the factory presets. Reconnect all the positive battery leads start the rig up and drive it for the afternoon. DO NOT let it idle for more than thiry seconds or so after the initial start up. Take it out for the afternoon drive around stop back up get on the high way etc etc. This will create a new adaptive memory.
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Post by chrometj on May 4, 2006 23:28:13 GMT -3
To dump the adaptive memory in the PCM disconnect all the leads on the positive battery post and touch them to a good ground for at least thirty seconds. That drains the capacitors in the PCM that stores the adaptive memory. Niow the jeep will run on the factory presets. Reconnect all the positive battery leads start the rig up and drive it for the afternoon. DO NOT let it idle for more than thiry seconds or so after the initial start up. Take it out for the afternoon drive around stop back up get on the high way etc etc. This will create a new adaptive memory.
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