Mild surging during acceleration & cruise
#11
12-22-2012, 07:53 PM
Join Date: Mar 2009
Location: Tokeland, Washington
Posts: 21,751
heres a link to what it says for a 51, http://www.mifbody.com/DTCs/DTC%2051.jpg
also heres links to the rest of em. LS1TECH - View Single Post - OBD1 DTC Codes & Troubleshooting
if 51 keeps coming up i would say pick up a tested ecm, run between 120 and 200 bucks. make sure you get the right one for your trans, make note of any numbers on the ecm.
also heres links to the rest of em. LS1TECH - View Single Post - OBD1 DTC Codes & Troubleshooting
if 51 keeps coming up i would say pick up a tested ecm, run between 120 and 200 bucks. make sure you get the right one for your trans, make note of any numbers on the ecm.
#12
12-23-2012, 10:03 AM
Yes, I did disconnect the battery before removing the ECM. Will disconnecting the battery alone reset the ECM and clear the error codes?
#13
12-23-2012, 10:10 AM
Join Date: Mar 2009
Location: Tokeland, Washington
Posts: 21,751
you can insure a ecm reset by touching the battery cables together (pos and neg) for a couple minutes, while they are "not" connected to the battery of course. make sure to unhook any aftermarket stereo equipment or electronics
#14
12-23-2012, 12:09 PM
Yes, I did disconnect the battery before removing the ECM. Is disconnecting the battery sufficient to reset the ECM and clear the error codes? Or are there additional steps necessary to clear the error codes?
#15
12-23-2012, 12:16 PM
Join Date: Mar 2009
Location: Tokeland, Washington
Posts: 21,751
it should reset,,, if you question if it did you can insure a ecm reset by touching the battery cables together (pos and neg) for a couple minutes, while they are "not" connected to the battery of course. make sure to unhook any aftermarket stereo equipment or electronics, this also resets any sensors memory.
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#18
12-25-2012, 06:36 AM
Good info given here from Craby.
My suggestions are:
1. Change fuel filter, it has been sitting for a long time.
2. Run a can of injector cleaner at the next tank fill.
3. As said, disconnecting power to the ECM resets it - drive the car for it to relearn.
My '88 Dually OBD1 sputters, surges, anything with an S, until I drive it to operating temp and give it WOT. The more its driven, the better it runs.
When ECM is put into diagnostic mode, first DTC should be 12 - ECM is communicating and good. You can short OBD 1 connector pins A to B and count the CEL flashes for DTC's, ie, flash, space, flash, flash, space, space, 12, 12, then the rest of the DTC's given by flashes.
And yes, a spark plug change, new air filter, make a world of difference.
My suggestions are:
1. Change fuel filter, it has been sitting for a long time.
2. Run a can of injector cleaner at the next tank fill.
3. As said, disconnecting power to the ECM resets it - drive the car for it to relearn.
My '88 Dually OBD1 sputters, surges, anything with an S, until I drive it to operating temp and give it WOT. The more its driven, the better it runs.
When ECM is put into diagnostic mode, first DTC should be 12 - ECM is communicating and good. You can short OBD 1 connector pins A to B and count the CEL flashes for DTC's, ie, flash, space, flash, flash, space, space, 12, 12, then the rest of the DTC's given by flashes.
And yes, a spark plug change, new air filter, make a world of difference.
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