Engine Identification (Page 3/4) fierofool MAY 03, 10:27 PM Honestly, I can't tell any difference in the starters. Could be a little difference in sound, but I really haven't paid attention. I removed the original and put the lightweight starter on when installing the 3.1, just because the starter was given to me. Otherwise I wouldn't have gone that route until the original and my two spare originals croaked. The 86 is distributor, so it has always taken a bit to start. The 87 is 7730 DIS and it pops off right away, even without the cold start injector. 82-T/A [At Work] MAY 04, 09:33 AM quote Originally posted by fierofool: Honestly, I can't tell any difference in the starters. Could be a little difference in sound, but I really haven't paid attention. I removed the original and put the lightweight starter on when installing the 3.1, just because the starter was given to me. Otherwise I wouldn't have gone that route until the original and my two spare originals croaked. The 86 is distributor, so it has always taken a bit to start. The 87 is 7730 DIS and it pops off right away, even without the cold start injector. Nice. I don't want to Bogart this discussion, but with the 7730 DIS, do you have the oil pressure sending unit configured in the factory way... e.g., until oil pressure is built up, the car won't continue to start? Just curious if that's the difference. In the factory configuration... (more or less something to the effect of what I'm saying), the fuel pump wiring is also goes through the oil pressure switch ... it can prevent it from starting quickly, but oddly won't make the car shut down while it's driving if you lose all oil pressure (probably so you don't crash or something). 1985 Fiero GT MAY 04, 10:15 AM quote Originally posted by 82-T/A [At Work]: Nice. I don't want to Bogart this discussion, but with the 7730 DIS, do you have the oil pressure sending unit configured in the factory way... e.g., until oil pressure is built up, the car won't continue to start? Just curious if that's the difference. In the factory configuration... (more or less something to the effect of what I'm saying), the fuel pump wiring is also goes through the oil pressure switch ... it can prevent it from starting quickly, but oddly won't make the car shut down while it's driving if you lose all oil pressure (probably so you don't crash or something). From what I understand, it works in parallel with the ECM, the ECM tells the fuel to pump whenever it gets ignition pulses, aka engine turning, and when there is oil pressure, so the pump can continue to run without oil pressure if the engine is turning, and the pump can continue to run without the ECM/engine turning if the oil pressure is high enough. 82-T/A [At Work] MAY 04, 12:49 PM quote Originally posted by 1985 Fiero GT: From what I understand, it works in parallel with the ECM, the ECM tells the fuel to pump whenever it gets ignition pulses, aka engine turning, and when there is oil pressure, so the pump can continue to run without oil pressure if the engine is turning, and the pump can continue to run without the ECM/engine turning if the oil pressure is high enough. Yeah, as I was writing this, it occurred to me that I have really no clue how it's wired in, just that it's "involved." olejoedad MAY 04, 01:30 PM quote Originally posted by 82-T/A [At Work]: Nice. I don't want to Bogart this discussion, but with the 7730 DIS, do you have the oil pressure sending unit configured in the factory way... e.g., until oil pressure is built up, the car won't continue to start? Just curious if that's the difference. In the factory configuration... (more or less something to the effect of what I'm saying), the fuel pump wiring is also goes through the oil pressure switch ... it can prevent it from starting quickly, but oddly won't make the car shut down while it's driving if you lose all oil pressure (probably so you don't crash or something). The OEM oil pressure switch supplies power to the fuel pump when there is oil pressure. It is designed to be backup power for the fuel pump, so that if the fuel pump relay fails, cranking the engine and building oil pressure will power the fuel pump and allow the engine to start and run. That's all it's for. Now, with the Chinese oil pressure sending units, we are seeing failures of the sending units when using the backup power circuits. I have been eliminating the circuit from the harnesses that I build for engine swaps. 82-T/A [At Work] MAY 04, 09:31 PM quote Originally posted by olejoedad:The OEM oil pressure switch supplies power to the fuel pump when there is oil pressure. It is designed to be backup power for the fuel pump, so that if the fuel pump relay fails, cranking the engine and building oil pressure will power the fuel pump and allow the engine to start and run. That's all it's for. Now, with the Chinese oil pressure sending units, we are seeing failures of the sending units when using the backup power circuits. I have been eliminating the circuit from the harnesses that I build for engine swaps. Ugh... it's a blessing and a curse when China remakes parts. We get new parts, but we also get crap sometimes. fierofool MAY 05, 08:04 PM 82-T/A [At Work My oil pressure switch isn't plugged in. When I plug it in the instrument cluster fuse blows. But the car starts immediately on the 7730. I don't know if the oi pressure switch was routed through the ECM, or not. Everything else is still factory wired and doesn't run off the ECM. olejoedad MAY 05, 10:25 PM The pressure switch should be routed from C203-B to OPS B OPS C to C203-L. Amd of course, OPS A to C203-Enfor the gage. The ECU should not be anywhere in the OPS circuit. Patrick MAY 05, 10:41 PM quote Originally posted by 82-T/A [At Work]: If you don't mind me asking... how do you like the lightweight starter compared to the old school one? I know the sound is different of course, and obviously some weight savings... but is there a perceivable difference in how the engine responds to it? Does it crank faster / start faster? They crank at least as fast as the twice-as-heavy original starters. It's a no-brainer to go the lighter starter route. N1022AR MAY 06, 01:17 PM 82-T/A I've been searching for the last couple days for a rebuilt 3.4 engine, and I am having no luck finding anything. I found one for 10,000$ but that can't be realistic, can it? I aware of the proper GM part number via other threads this forum. Any suggestion on where to find a rebuilt 3.4? I tried AutoZone per your recommendation and they also don't have any.