Went to install everything today. found that my T stat housing akso has a bung that the ECT fits nicely into so it will be installed there tomorrow. Got to looking and the ect where it was on the intake wasnt the worst of that proble. But they had also when they extended the connection used the wrong plug, it fits over the connection backwards so it broke the terminals inside of the new ECT. I ordered a new plug, bought a new ect will be installing both along with the IAT in hte morning reinstalling the upper intake blah blah. Any way will let those of you attempting to help me know the rsults, I'm hoping this clears my problem up. Also I have taken a pic of the vac lines under the upper intake, Im just wanting to know if they are all routed correctly?
Everything hooked back up rechecked codes. The ECT is working. I'm honestly thinking maybe the fuel pump though I had three codes R172 R136 R334? I went around spraying carb cleaner not much happened. So I sprayed some in the air cleaner the idle smoothed out and I could even rev the engine some while spraying carb cleaner. But that's it. Oh also I reset the codes before testing and still got C 512.
Could be a bad pump but I would check fuel line pressure to confirm before replacing. Perhaps someone can confirm but I believe that the O2 sensors default lean when failed or failing. See http://www.youtube.com/watch?v=1mb4VmDd0ao
Now that you have the ECT sensor working, what exactly is happening when driving that is of concern?
So the engine bogs under throttle but doesn't with the MAF disconnected. Does it behave that way with the engine under load (in gear) and with no load (in neutral)? MAF is new (and is correct for the car) and the connection pins aren't bent or misaligned. It's the MAF behavior that is puzzling and would seemingly eliminate most the other possible causes for the engine to bog. Are you sure there isn't a vacuum leak caused by a broken fitting or a hose disconnected from the underside of the intake? What is the vacuum reading at idle? It should be about 18 inHg.
All of the Vac lines and fittings are brand new replaced them the other day when it was brought up. I can feather the pedal and get it over two grand and with kind of feathering it keep it around that but no higher both in park and driveing. I can unplug the MAF and it will throttle up quickly and smoothly. Havnt tried driving it like that though. However if I let off the throttle with the MAF unplugged it wont idle, it just dies. MAF is new and IAT is new. Both were showing codes at first as well as the ECT. WHen Ive seen this before a new MAF fixed it. THe only reason I thought fuel pump is when I unplug the MAF and it goes into limp mode, or full rich, its letting more gas through so it will run? Plus with the MAF plugged in, I can spray brake cleaner into the intake tube and it will throttle up and idles smoother.
Well at least you are dealing with fairly cheap parts (as of right now) so it probably wouldnt hurt to change it all on that old car anyways. Hopefully you will find the issue laying somewhere in that area.