So I recently swapped a 5.0 into my formerly v6 car. The motor came out of a 89 and it is all setup running on a computer out of a 95 GT. When I first got the car together I put on the throttle body that the guy gave me when I bought the motor which is presumably a 89 and through a few problems I ended up running the car for a little while without a IAC or a TPS. Now I know it isn't the best idea to do this but the computer has base values for all of these things and with my wideband I could make sure that the car wasn't running lean and trust me is was not running lean!! 5mpg at best and the wideband was always reading somewhere near 10.0 (the car didn't get driven much with that kind of gas mileage). Now that I have a quaterhorse with binary editor and eec analyzer I decided that it was time to go through and fix those things that I had just bandaided to get the car running since they were limiting the computer from determining load and letting the car add in more timing at cruising (atleast the TPS was). So the other day I went through and put a TPS on the car from a 89 GT that I bought at Autozone and the IAC from my v6.I calibrated the TPS and went to start the car and there was a bad sound coming from the IAC so I went through and had a new one of those for a 95 Gt ordered in. Tonight I put that on the car and went to start it and all the car will do is start and rev up to about 4k rpm then stall out on its own. I assumed that some other problem had just come up and checked fuel and spark and both were good so I disconnected the wires for the TPS. Because I'm using the fox throttle body on a sn95 I had to go through and wire the harness to the TPS since the connectors are different. After I disconnected the TPS the car started up and ran perfectly. I assumed that it must just be because of the computer learning that the throttle was always at the same position from the TPS missing so I reflashed the ECU to stock and tried it and no difference.
Really not sure what is going on with this one. I cant think of anything else that might be causing it. The TPS is new and the IAC is new. I verified that the TPS is reading correctly through binary editor and it reads that its at .99ish when nothing is pressing the throttle and it gradually climbs as I press the throttle so I don't suspect it being bad.
As always any help would be greatly appreciated as I am totally stumped this time and don't know what to try next other than a different throttle body and I don't really want to do that as I spent quite a bit of time making brackets and modifying my sn throttle cable to work with the fox throttle body.
Really not sure what is going on with this one. I cant think of anything else that might be causing it. The TPS is new and the IAC is new. I verified that the TPS is reading correctly through binary editor and it reads that its at .99ish when nothing is pressing the throttle and it gradually climbs as I press the throttle so I don't suspect it being bad.
As always any help would be greatly appreciated as I am totally stumped this time and don't know what to try next other than a different throttle body and I don't really want to do that as I spent quite a bit of time making brackets and modifying my sn throttle cable to work with the fox throttle body.