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Okay so my search hasn't exactly been the most fruitful of the following question. What are the dimensions of a Renix 4.0 TPS bolt and IAC bolt? I wanted to replace the bolts because I lost one, the other TPC bolt started stripping at the torx head, and the IAC bolts somehow have a triangular shape to the shaft. On a whim yesterday, I took the TPS bolt to the hardware store, and it seemed to match with an M5, but the M5s that I took home seem too big. Today I returned and noticed that the TPS bolt will thread into both the M5 and the 10-32 gauges. But when I compare the bolt to what they have, it seems the threads don't sawtooth together with the 10-32 bolts. Or maybe it was 8-32, heck I dunno, I've got so many numbers already to memorize... The IAC looks to have a larger diameter shaft. '89 4.0 Renix, by the way.

Hi All, Have found this forum really useful so far. I'm in in the process of installing a new clutch kit / master cylinder for my 1990 2.5L 4 cylinder, 2WD. I've removed the driveshaft, drained the transmission fluid, removed the crossmember and disconnected all the various gadgets from the transmission. The bolts holding the bell housing to the engine were seized pretty fierce. I have all but one bolt on the transmission broke free (loosed, or however you say that), although I tightened them back up once I got them to break free. There's only one remaining, and I can't for the life of me get it. It's counter-clockwise one bolt from the topmost bolt, 18mm, and has what I believe is the timing sensor cable clip attached to it which makes it hard to get at. I cannot get a breaker bar on it, and all I can fit in there is a standard 18mm wrench (from the top) which I can only get to fit in the space one awkward way. It's not a great grip and even if it was, I'm not sure I could break it with that wrench. I've tried about a million angles of attack with every tool I can scrounge. I've blasted all the bolt heads and visible nuts with PB Blaster several times (only way I was able to loose the first few) but still no luck. For the life of me I can't get a good angle on it. Is using a torch the next step? I read here: http://www.carforum.net/routine-preventative-maintenance/5506-how-remove-rusted-seized-bolts.html that I should heat up the nut, not the bolt, but am not sure if I can heat the metal that the transmission nut screws into safely -- that's the engine, as far as I can tell -- seems iffy. Any help / tips would be much appreciated. Thanks,