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Old 12-04-2012, 07:00 PM   #1 (permalink)
allsierra123
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Eprom questions

Ok I installed my F intake. The truck I pulled it from had been picked over pretty well. The guy said he thought it was a 94 or 95 Which it had the baro sensor up on the firewall so I thought he may have been right. It was a 2500 3/4 ton. Swap went pretty easy everything went together as it should. I also pulled the computer from that unit thinking I would swap in the eprom to eliminate any egr based codes. SO I swapped it in today. And got no codes also noticed the red line rev limiter was taken out as well. Kind of odd mine normally kicks on at 3000 rpm when revving it while sitting still. Ok whatever maybe the F codes are different im thinking. So I take it out on the road for a test. It wont shift out of first gear. I restart it several times but to no avail this thing wont shift. I got no CEl's at all which I was getting with my old eprom. So I swapped my old one back in and it shifts once again. Any ideas as to why it wont shift or is that the nature of dealing with Eproms. on a side note it ran like a raped ape with that new chip lol up till 40 mph anyway.
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95 GMC Yukon 2 door
6.5 TD 4L80E, 3:73 Ratio. 286/75/16 tires.
"F" intake. EGR delete. "F" prom chip.
Pmd In the bumper. #9 resistor.
3" DP, 2.25" Crossover. 3" exhaust
Single Thermostat cooling system.Hi flow water pump.
Ac delco clutch and Duramax fan.
S&B air intake system.

Last edited by allsierra123; 12-04-2012 at 07:01 PM.
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Old 12-04-2012, 11:37 PM   #2 (permalink)
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Was it a manual trans truck the ECM came out of? Remove the cover from the ECM and tell us what the 4 letter broadcast code is on it so we can tell you what it is for.
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Old 12-04-2012, 11:44 PM   #3 (permalink)
allsierra123
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The running gears were gone out of it. When I take the cover off the computer where will I see the code.

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95 GMC Yukon 2 door
6.5 TD 4L80E, 3:73 Ratio. 286/75/16 tires.
"F" intake. EGR delete. "F" prom chip.
Pmd In the bumper. #9 resistor.
3" DP, 2.25" Crossover. 3" exhaust
Single Thermostat cooling system.Hi flow water pump.
Ac delco clutch and Duramax fan.
S&B air intake system.
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Old 12-05-2012, 08:36 AM   #4 (permalink)
bigblazer
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I tried the same thing with my truck.no shifting and i had no gliw plugs too.you cant swap proms.try the whole computer.there is like almost thirty different codes for 94/95 so finding a match is crazy hard.
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94 Chevy blazer. 929 block, hd 4l80e, pmd relocated in bumper, #9 resister, ssd "80" hp chip, gm8 with DIY boost controller now 18psi, 3 down tube 4" straight pipe 5" tip, k&n cone, optic bump, kennedy injectors, boost/egt/trans/oil pres/water temp gauges, 3 core aluminum radiator w/dual fans, 98 "h.o" w/p with restricters installed, cowl hood. 4.10s in 14b semi floater, 35 firestone m/ts 8" rough country lift 3" body lift. Dos cientos quatro whp As of 2/21/13 thats all she's gonna put out!
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Old 12-05-2012, 08:39 AM   #5 (permalink)
vstech
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no running gear in the donor, but was there a steering column? did the column have a prndl? how about brake pedal/clutch pedal?
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Old 12-05-2012, 10:00 AM   #6 (permalink)
JMJNet
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The code have to match exactly.

It should be on top of the IC with the blue carrier.
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1995 GMC Suburban:
PMD in Bumper
4" Warpspeed Exhaust
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Bosch Duraterm GP
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Old 12-05-2012, 11:35 AM   #7 (permalink)
allsierra123
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I didn't notice the pedals. But the column was gone. I wasnt really looking for it. I called him this morning though it was a standard truck.

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95 GMC Yukon 2 door
6.5 TD 4L80E, 3:73 Ratio. 286/75/16 tires.
"F" intake. EGR delete. "F" prom chip.
Pmd In the bumper. #9 resistor.
3" DP, 2.25" Crossover. 3" exhaust
Single Thermostat cooling system.Hi flow water pump.
Ac delco clutch and Duramax fan.
S&B air intake system.
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Old 12-05-2012, 11:44 AM   #8 (permalink)
JMJNet
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Yes, that eprom cannot be used in your truck since your truck is automatic.

Means that the code does not exactly match.
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1995 GMC Suburban:
PMD in Bumper
4" Warpspeed Exhaust
KD LP/OPS Harness
Bosch Duraterm GP
Heath Turbo-Master
Chevron's XLP Diesel Additive
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Old 12-05-2012, 12:27 PM   #9 (permalink)
Tommygunner
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Yeah the manual trans PCM wont work But you can always have it reflashed for an automatic. Talk to Alex at http://www.pcmperformance.com/index.html pretty sure he will do a factory reflash to automatic for around 80.00. They also do custom tuning for 6.5. Havent used them for diesel but i had them program a LT1 Pcm great program and real fast turnaround.
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1998 GMC K1500 6.5 66000 miles. Auto, 3.73 gears.
Remote PMD mounted on the radiator support
KOJO tune WOW !
Carter HD lift pump. Feed the beast
K&N filter
Ported, gasket matched upper intake.
New Bosch injectors. flow matched 2200 lbs pop
3 1/2" custom Aero turbine exhaust. Nutered Cat
2" Lift RS5000 Shocks. 285 X 17 BFG AT summer tires.
12.50 x 33 x 15 Procomp MTswinter. Powertrax No slip locker in rear.

Last edited by Tommygunner; 12-05-2012 at 12:29 PM.
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Old 12-05-2012, 12:56 PM   #10 (permalink)
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Quote:
Originally Posted by Tommygunner View Post
Yeah the manual trans PCM wont work But you can always have it reflashed for an automatic. Talk to Alex at http://www.pcmperformance.com/index.html pretty sure he will do a factory reflash to automatic for around 80.00. They also do custom tuning for 6.5. Havent used them for diesel but i had them program a LT1 Pcm great program and real fast turnaround.
Were talking 94-95 OBD1, not 96+ OBDII. The code doesn't have to match exactly for it to work, but it does need to be for the correct application and options such as trans, gear ratio, turbo or not, and S or F.
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