98 to a 99 PCM... fuel gauge not working.
#1
98 to a 99 PCM... fuel gauge not working.
I understand that some tuning must be done to have a working fuel gauge in a 1998 trans AM with a 1999 PCM swapped in.
I purchased the vehicle after this had all been completed, and the fuel gauge never worked from the beginning (the previous owner also neglected to tell me, advising that it worked fine).
Can someone explain to me what is required?
I ask because I am on the verge of buying a racetronix fuel pump and for the life of me can't find a fuel sending unit for a 98 LS1.
I'm hoping the original owener just didn't have it tuned in,
I purchased the vehicle after this had all been completed, and the fuel gauge never worked from the beginning (the previous owner also neglected to tell me, advising that it worked fine).
Can someone explain to me what is required?
I ask because I am on the verge of buying a racetronix fuel pump and for the life of me can't find a fuel sending unit for a 98 LS1.
I'm hoping the original owener just didn't have it tuned in,
#3
Interesting. Thanks for your response.
I am going to take in to Champion motors and have em work their magic - but there is also the possibility that the sending uint is pooched - i really hope not.
Thanks for the response.
I am going to take in to Champion motors and have em work their magic - but there is also the possibility that the sending uint is pooched - i really hope not.
Thanks for the response.
#6
jAMES@SHORTUNING:
Can you explain that a little further? I am interested in doing it the best way possible. Not sure what you mean by doing a fuel gauge segment swap.
Thanks!
Can you explain that a little further? I am interested in doing it the best way possible. Not sure what you mean by doing a fuel gauge segment swap.
Thanks!
#7
FormerVendor
Join Date: Nov 2012
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The 98 fuel sending unit uses a different ohm output from the sender than the newer 99-up LS Fcar uses. We do not have the tables to physically adjust the sensor range so we have to rely on programming GM did for other vehicles.
The calibrations on these platforms are separated into segements. Engine, Transmission, Diagnostics, System, Fuel etc are some of the different segements in a calibration. So finding a tune file that uses the correct ohm output but uses the same operating system is what must be done to properly setup the fuel gauge in a 98 car using the new PCM. The 2002 Chevy Express Van still used the older style sending unit like the 98. So the popular swap is to move the fuel segement from a 12212156 2002 Express Van file over to a 2002 12212156 Fbody. Once the fuel segement is done you arent out of the woodwork just yet, you must calibrate the fuel tank size, gauge output and volume vs sender reading. So it is a bit involved but luckily most tuners have figured this out and can save you time by writing the right file to your PCM for you.
*** edited for mis-information
The calibrations on these platforms are separated into segements. Engine, Transmission, Diagnostics, System, Fuel etc are some of the different segements in a calibration. So finding a tune file that uses the correct ohm output but uses the same operating system is what must be done to properly setup the fuel gauge in a 98 car using the new PCM. The 2002 Chevy Express Van still used the older style sending unit like the 98. So the popular swap is to move the fuel segement from a 12212156 2002 Express Van file over to a 2002 12212156 Fbody. Once the fuel segement is done you arent out of the woodwork just yet, you must calibrate the fuel tank size, gauge output and volume vs sender reading. So it is a bit involved but luckily most tuners have figured this out and can save you time by writing the right file to your PCM for you.
*** edited for mis-information
Last edited by James@ShorTuning; 08-05-2013 at 12:57 AM. Reason: Correct information
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#9
Hey you guys not wanting to highjack this thread but im going through the same bs.
I bought a 1998 roller off of here previous owner installed 01-02 style pcm and i did a 99+ style fuel tank assembly in it from the filter and plastic hoses to the fuel cap.
I spoke with my tuner and i understand the concept of needing some tweeking to callibrate the sensors and what not. I am using the stock 98 style fuel pump harness since the plug on my 99 was half burnt. So my tuner at frost tunning "great guys over there " i recommend them if you need a tune" advised me to either use a 99 style fuel pump harness or i need to look into reaaranging some wires on the 98 harness. So if anyone has a clue what wires to mess with please give me a shout out 3132658824 thank you guys
I spoke with my tuner and i understand the concept of needing some tweeking to callibrate the sensors and what not. I am using the stock 98 style fuel pump harness since the plug on my 99 was half burnt. So my tuner at frost tunning "great guys over there " i recommend them if you need a tune" advised me to either use a 99 style fuel pump harness or i need to look into reaaranging some wires on the 98 harness. So if anyone has a clue what wires to mess with please give me a shout out 3132658824 thank you guys
#10
Wow 4 year bump! No hijacking here.
I've purchased a 98 harness ECM and I am reverting back.
Just waiting for some responses in my new thread.
Cheers. Best of luck.
If you get it working - do a write up.
I've purchased a 98 harness ECM and I am reverting back.
Just waiting for some responses in my new thread.
Cheers. Best of luck.
If you get it working - do a write up.
#12
TECH Senior Member