supermailman
OBS Enthusiast
1990 1500, 350 TBI, I have been tracking down multiple problems on my truck just to get it in decent running shape in preparation for the 5 speed swap I'm doing. I've replaced the plugs (ac delco coppers), o2 sensor (ngk), egr valve (delphi - old one was completely shot) and associated hoses/lines. The line from the TB to the egr solenoid was cut in half and the line from the solenoid to the valve itself was plugged on the valve side with a screw. the pcv valve was also gummed up pretty good, i also replaced that. Among the 4 or 5 codes I had, one was associated with the TPS (I can't remember the exact code). The replacement was a Tomco brand part. It had the elongated/adjustable bolt holes instead of the smaller non adjustable ones that the OEM tps had.
My first question is when testing voltage from the TPS what should the idle and WOT values be? I put it on as close to the OEM as possible but have yet to check it with a meter, will do that once I know for sure what voltage should be and adjust accordingly.
Among my replacement parts was also a new Delphi coolant temp sensor. It had the original one and it was starting to turn green and look corroded so it had to go. How far down should this thread into the intake manifold? I could only get it a little more than halfway before it started getting REALLY tight and I didn't want to break anything.
After all of this, I now only have one code and it is code 45. Truck is definitely running rich and once it gets warmed up a bit it starts to get a real lopey idle like it has a performance cam in it or something and act like it wants to die. There is also some greyish/black smoke that comes from the exhaust when you give it any gas. It has a new distributor in it from previous owner. The lopey idle and smoke from exhaust did not happen until after I patched up the EGR system and replaced the TPS. Replacing the spark plug wires, cap, and rotor are next on my to do list for preventative maintenance.
Finally, some people say a new MAP sensor may fix a code 45. I unplugged it and the truck would barely run without it and wanted to fall flat on its ass. Does that sound right?
My first question is when testing voltage from the TPS what should the idle and WOT values be? I put it on as close to the OEM as possible but have yet to check it with a meter, will do that once I know for sure what voltage should be and adjust accordingly.
Among my replacement parts was also a new Delphi coolant temp sensor. It had the original one and it was starting to turn green and look corroded so it had to go. How far down should this thread into the intake manifold? I could only get it a little more than halfway before it started getting REALLY tight and I didn't want to break anything.
After all of this, I now only have one code and it is code 45. Truck is definitely running rich and once it gets warmed up a bit it starts to get a real lopey idle like it has a performance cam in it or something and act like it wants to die. There is also some greyish/black smoke that comes from the exhaust when you give it any gas. It has a new distributor in it from previous owner. The lopey idle and smoke from exhaust did not happen until after I patched up the EGR system and replaced the TPS. Replacing the spark plug wires, cap, and rotor are next on my to do list for preventative maintenance.
Finally, some people say a new MAP sensor may fix a code 45. I unplugged it and the truck would barely run without it and wanted to fall flat on its ass. Does that sound right?
