renaissance
Member
95 Yukon 2 door 4WD VIN S 115,000 miles on the dash, but probably closer to 185,000. Carfax shows a service record at 170,000 miles. This truck is a daily driver for the 100 miles commute to work. Donor is a 94 2500 HD 2WD VIN F.
Tracked down a full set of factory service manuals and purchsed GMTDTech Scan software and cable. Set of injectors and single thermostat cooling kit with fan on the way from Heath's.
Replaced lift pump with one from the donor that was less than 1 month old and found some creative wiring. Lift pump power was wired into trailer light circuit and OEM connector was toast. New connector from Pep Boys got the wiring back in place.
New steering box, pitman arm, cooler and all new lines installed. Wouldn't start after steering work. Frayed wiring to crankshaft position sensor dropping 5 VDC on that circuit down to < 1 VDC. Metal clip broke off sensor at the block when I tried to replace it. Lots of fun removing alternator, power steering pump and bracket to get to the broken sensor. Ended up drilling the sensor and using a lag bolt through a box end wrench to pull it out.
Manual recommends TDC learn after replacing crankshaft sensor. TDC offset was +0.26 (seems a bit off from what I've read on this site ) before TDC Learn. After TDC Learn -1.41, but got a DTC 56 code. Previous owner had done a PMD relocate, and when I checked there was no calibration resistor on the PMD. Local NAPA store had a #9 resistor.
Questions for members:
When I did the TDC Learn, engine speed did not increase to 1,000 rpm as expected ( it stayed right around 680 rpm ). I could see the timing changing on the screen as it went through the learn, and TDC Offset went from +0.26 to -1.41. Does this sound right?
Is a #9 resistor OK or should I order a #5? I'm not pulling anything, just driving 70 mph on flat Florida highways to work.
Tracked down a full set of factory service manuals and purchsed GMTDTech Scan software and cable. Set of injectors and single thermostat cooling kit with fan on the way from Heath's.
Replaced lift pump with one from the donor that was less than 1 month old and found some creative wiring. Lift pump power was wired into trailer light circuit and OEM connector was toast. New connector from Pep Boys got the wiring back in place.
New steering box, pitman arm, cooler and all new lines installed. Wouldn't start after steering work. Frayed wiring to crankshaft position sensor dropping 5 VDC on that circuit down to < 1 VDC. Metal clip broke off sensor at the block when I tried to replace it. Lots of fun removing alternator, power steering pump and bracket to get to the broken sensor. Ended up drilling the sensor and using a lag bolt through a box end wrench to pull it out.
Manual recommends TDC learn after replacing crankshaft sensor. TDC offset was +0.26 (seems a bit off from what I've read on this site ) before TDC Learn. After TDC Learn -1.41, but got a DTC 56 code. Previous owner had done a PMD relocate, and when I checked there was no calibration resistor on the PMD. Local NAPA store had a #9 resistor.
Questions for members:
When I did the TDC Learn, engine speed did not increase to 1,000 rpm as expected ( it stayed right around 680 rpm ). I could see the timing changing on the screen as it went through the learn, and TDC Offset went from +0.26 to -1.41. Does this sound right?
Is a #9 resistor OK or should I order a #5? I'm not pulling anything, just driving 70 mph on flat Florida highways to work.