grampadirt

Why did it take over a half hour to go to CLOSED LOOP?It should happen in a few minutes.It took forever for your engine to get up to almost 190°,operating is 195°.Is there a thermostat in it?If there is it looks like it's stuck open.Looking at your O2 sensor it never fluctuated betweeb 100(or so) and 900(or so),all I saw were steady numbers...400s,500s,600s and then finally 700s....not the way a O2 sensor works.Change that O2 sensor gauge to a graph and you'll see what I mean.Pay close attention to the voltage values on the side.The O2 Sensor will start in the 450 range and as it warms up the

Do a search for A/C conversion valves,I just found a bunch.

Did you use ACDelco or Delphi sensors? Any aftermarket parts are suspect to their quality.Also,with the coolant temp being what it is the fuel system should be in CLOSED LOOP,check to see if the O2 sensor is ranging from low .100mV-.900mV.If you can snap a pic of the O2 sensor's voltage,it should be an up & down zig zag pattern. Here's a video I did a long time ago(not so good camers :(),look at the lower left gauge \,the voltage is constantly changing....is yours doing this?It should take a few minutes for it to warm up enough to start ranging,when it gets warm enough your fu

Re-install the driveshaft and try again,I'll bet the tailshaft is spinning and not letting the parking pawl engage.

Know anyone with a good scanner? I'd check the fuel trims first,they'll tell you alot.Check the MAF sensor,might need a cleaning.Got a clean air filter?Does it have the correct spark plugs?

Is this what you're looking for? https://www.originalair.com/91-93-chevygmc-truck-ac-compressor-upgrade-kit-v8-stage-1

Thanks bud,i don't often post but i do browse the site occassionaly. I bought an Autel MaxiPro808 scanner which helped a lot.

Well,got her running pretty good now,hopefully it will last. Removed the #3 connector to the PCM and tested all the wires from the throttle body connector to check continuity....all were good.Noticed a split on a vacuum connector coming from the air box down to a fitting on the engine,replaced that.Went to AlldataDIY(been a member for years) and found that vacuum tube went to the fuel pressure regulator.Not sure if it had any bearing on the problem.I put it all back together and bingo!! The main dtc was p1512,correalation between the requested throttle body % and the actual %.So my

So,this is my son's Trailblazer....it went into reduced engine power one day on his way home from work and barely made it to my house.Plugged in my scanner and came up with P1512,P1515 & P1516.A friend of ours,after checking out You Tube installed a new throttle body,no change.It still has an erratic idle...goes up and down from 500rpm to about 2000rpm.Re-installed the old one and returned the new one.For some reason it got better and now only has a P1512 code.Did a idle relearn procedure but not sure if I did it right,no change.Both O2s acting funny so replaced them,no change.Tugged on th

You're Welcome,glad I could help.

There are three temp sensors....the one one the pass, head is actually a switch which will close at approx. 220*(I tested mine in a pan of boiling water with a thermometer) and turn the aux, fan on.The one in the drivers side head runs the temp gauge,the one under the thermostat housing sends a signal to the PCM(this one has a direct effect on how fuel is delivered to the engine).Remove and clean the EGR valve of any carbon build up on the valve and in the intake manifold(I use a vacuum cleaner as I scrape and clean).Check the TPS to make sure it sends a smooth signal to the PCM,a DMM will wor

Kind of looks like a blower motor resistor.Is there voltage on the red wire?Try turning on the blower motor and check the voltage then.I would think the blower motor resister would be inside the cab though... Maybe the remnants of a trailer brake controller?..dunno..

Classic Industries has what you need...p/n 5671510

You didn't use a temp sensor meant for the aux. fan in the engine temp hole ,did you?

Did you replace the sensor in the driver's side cyl. head?,that's the one the gauge reads,the computer reads the one by the thermostat.The aux. cooling fan uses the one in the pass. side head.