area1509

Forgive me if this is here some where, but my searches have been fruitless.

What I Did:
1998 GMC 1500 I removed a 305 / 4L60E and installed a 350 / 4L80E the 350 and 80 came together with the wiring harness and computer everything went ok until I tried to start it with the 350 computer it would start and run for about 20 RPM's then **** down so I put the 305 computer in and it runs ok.

Question 1: will the computer make a difference, is there a trick to getting the 350 computer to work?

When I take off from a stop it feels like the lockup converter is truing to lockup right away, this has killed the engine a few times.
it does not feel like the tranny is shifting rite ( rpm goes high i shift it to drive or second to get it to shift )

I am lost at this point.
AJ

Wheatley

iTrader: (12)

First,the PCM with the 305 and 4L60E programming is not gonna run the 350 and 80E tranny.It has to be flashed with a 350/80E file.
Now you said the PCM that came with the 350/80E would start and die correct?
If so do the security relearn.98+ has VATS,when you swap a PCM from another truck in your truck,the VATS have to be relinked.
I will pm you the security relearn steps.
So take the PCM that came with the 350 and 80E tranny and do the steps I am about to pm you.

Wheatley

iTrader: (12)

PM sent.Do those steps EXACT.If they are not done correctly you will have to start over to step 1

dlt76028

iTrader: (13)

^^^^^good advice

area1509

Thank you I will give it a try.

area1509

Thank you so much! I was starting to think the tranny was junk but it shifts like a dream now.
Now to work out the slight miss it has and it should be good for another quarter million miles.

again Thank You
AJ

area1509

Can anyone tell me what this means?
output from scan tool

------------------
DTC_CNT 0
FUELSYS1 CL_Fault
FUELSYS2 CL_Fault
LOAD_PCT(%) 13.7
ETC(°F) 198
SHRTFT1(%) -7.0
LONGFT1(%) 6.3
SHRTFT2(%) -6.3
LONGFT2(%) 5.5
MAP(inHg) 16.2
RPM(/min) 1628
VSS(mph) 12
SPARKADV(°) 35
IAT(°F) 102
MAF(lb/min) 5.089
TP(%) 16.9
O2S B1S12--B2S12--
O2B1S1(V) 0.165
SHRTFTB1S1(%) -0.8
O2B1S2(V) 0.445
O2B2S1(V) 0.780
SHRTFTB2S1(%) -1.6
O2B2S2(V) 0.090
OBD Not OBD
------------------

area1509

DTC_CNT 0----------------DTC Stored Number
FUELSYS1 CL_Fault---------Fuel System 1 Status
FUELSYS2 CL_Fault---------Fuel System 2 Status
LOAD_PCT(%) 13.7---------Calculated Load Value
ETC(°F) 198----------------Engine Coolant Temperature
SHRTFT1(%) -7.0-----------Short Term Fuel Trim Bank 1
LONGFT1(%) 6.3------------Long Term Fuel Trim Bank 1
SHRTFT2(%) -6.3-----------Short Term Fuel Trim Bank 2
LONGFT2(%) 5.5------------Long Term Fuel Trim Bank 2
MAP(inHg) 16.2-------------Intake Manifold absolute Pressure
RPM(/min) 1628-------------Engine RPM
VSS(mph) 12---------------Vehicle Speed Sensor
SPARKADV(°) 35------------Ignition Timing Advance
IAT(°F) 102----------------Intake Air Temperature
MAF(lb/min) 5.089----------Mass Air Flow Sensor
TP(%) 16.9-----------------Absolute Throttle Position
O2S B1S12--B2S12--
O2B1S1(V) 0.165-----------O2 Sensor Output Voltage (B1S1)
SHRTFTB1S1(%) -0.8-------Short Term Fuel Trim (B1S1)
O2B1S2(V) 0.445-----------O2 Sensor Output Voltage (B1S2)
O2B2S1(V) 0.780-----------O2 Sensor Output Voltage (B2S1)
SHRTFTB2S1(%) -1.6-------Short Term Fuel Trim (B2S1)
O2B2S2(V) 0.090-----------O2 Sensor Output Voltage (B2S2)
OBD Not OBD


I guess what I am asking is are these values normal?