I am using a 747 with AMUM as it is the stock setup on my 90 350 4wd 2500 pickup. I have added a reworked stock intake to accept a Holley 670 cfm TBI (2" throttle bores), replaced the stock fuel pump with a 350 TPI pump, set the fuel pressure to 20 PSI, added a Mallory Hyfire IV ignition, coated Flowtech afterburn headers, fabricated a 3" Y pipe installed a 3" HP converter and Hearthrob 3" single exhaust system. I have a UV eraser, Pocket Programmer II and am using WinALDL and TunerPro.

I am having a problem when burning chips. I erased a chip, reprogramed the stock settings for a new BPW constant, changed the Main Spark Table, the Main Fuel Tables #1 and #2, and the PE table. I saved the new file and then I compared the two files. I noticed that the all of my changes were on the comparison as well as two additional positions that I did not change. On position 0000000 the first two alphanumeric changed from 82 (stock) to 88 on the modified program. Position 00000001 changed from 3A to 59. When I tried to program the chip which was verified as erased, the chip did not program but the chip was nolonger blank. It filled position 00000000 with 88 and stopped programming. I can reprogram a blank chip with the stock program. Can someone please explain what I need to do to correct this problem?

 

The first two locations changed as they are the checksum. Whenever any location in the BIN has been changed usually the check value will also change.

RBob.

 

Thank you for this information. Does this mean I have an incorrect check sum that is preventing the chip from programming? If so what is the best way to solve the problem? If not what else can cause the problem?

Al

 

The checksum is probably OK. It isn't used until the chip is in the ECM, that is when it is checked (at key-on).

Which chip are you using? It sounds like the original 2732's, which are not the best around. Sometimes they work, sometimes they don't.

RBob.