Luckily it was easier than i imagined to get the bolt out.. Still no throttle response when it heats up. It finally stalled and it would not fire back up. On to the O2 testing. CPS is as close as I can get it, pulling a solid 3v.. I'm still not seeing 5v..

 

Is that after it stalled?

 

No, it was showing 3v before I fired it up after installing it. Today, I put a new coil on. Started right up, when it got a little warm, it started the no throttle response and black smoke for about 2 minutes. Then, it ran great at idle for about 20 minutes, I took it around the block a few times with no trouble, pulled in the drive way and.. no throttle response and black smoke then it stalled. I waited 2 minutes and it fired up, let it idle for another 15 minutes and it ran great.. It's definitely better since I put the new coil on. It's still doing what it was doing before but less frequently and it doesn't last as long. This thing is possessed!

 

Wiggle the connector on the MAP at idle and see what happens. For that matter, wiggle all the engine wiring harnesses.

 

Hey, any progress is progress! Without reading back through, what you describe might be what you would see with trouble with the MAP tube from inside the TB, running back to the MAP up there on the firewall. Gotta be flawless! No little crack and free to provide manifold vacuum to the MAP.

I guess that got mentioned, but....I broke mine while messing with other stuff, you might want to double check...Glad the new coil helps, I had thought you might want to see a good CPS signal before making that investment, but it looks like it payed off.

Your line from the fuel pressure regulator to the manifold is hooked up and good?

 

Will do in the morning, thanks!

 

The tube running from the tb to the MAP looks good visually, maybe I will pull it off and really look at it thoroughly considering it's importance. I modified the echlin CPS I bought from Napa, the top of the sensor is bottmomed out on the lip of the housing, so it's as close as it's going to get to the flywheel, for the life of me, I can't get a 5v reading. I have a good suction on the regulator and the fuel system checked out as all good according to the tests I've done with the fuel pressure tester I rented a couple of weeks ago. It's hard to tell which direction I need to go at this point. It never runs poorly when it's cold, it starts doing what I've described when it gets a little warm and then randomly repeats from there. Maybe I will get under there tomorrow and test the coolant sensor again also.. I've replaced that already months ago but you never know.. Would you happen to have a procedure for testing the coolant sensor? I appreciate you guys sticking with me!- Bob

 

Wires, connectors and harness were wiggled.. all good. No change.

 

Yea. Wait for a drizelly day so you can have water running in your ear to get the full effect of the fun of that job. I lifted the frame so the left front was hanging a bit for better access. Unplug the connector and watch the resistance while it warms up. The chart shows it dropping to under 200 ohms at 212*....Mine dropped to 3 something and cycled up and down there with the thermostat opening and closing at 195* (I verified temp there). In other words, mine seems to test out of speck. The IAT on the manifold uses the same specs, but I suppose it doesn't get as hot?, (so resistance might be higher) I thought of starting a thread just to find out what others are seeing! (with mileage in mind). Anyway see>
http://www.lunghd.com/Tech_Articles/...iagnostics.htm

You gonna do that 02 sensor while you are down there?

 

CTS is good. I checked the o2 sensor while I was under there and it was a mess. B L A C K with carbon. There is no way that sensor was working properly with the amount of build it had on it. I replaced it. When I first fired it up, it started hesitating for maybe 3 seconds then cleared up. I ran it for about 45 minutes, took it around the block a few times, all good. Then, the RPM's started fluctuating between 500 and 1000, kind of what would happen with a bad TPS but not as drastic. And then it started doing it's thing again.. No throttle response, blowing black smoke, this time it lasted until I shut it down. I fired it up about 30 minutes later and it was still doing it..

 

We're gonna have to try some more things.

Unplug the IAT when it's acting up.

Have you ever done the sensor ground test?

 

Yep, I remember doing that test, it was at a dead 0 when I wiggled the MAP and the harness. I also did the ground refreshing and C101 cleaning.. WHen I unplug the IAT when it's acting up, what should I expect?

 

I just wanna know if things change. I wonder if your MAP sensor is dying.

 

The MAP sensor is new but you never know, could be bad..

 

All yours Pete, but I'm grading you. Just kidding Rob, if I comp up with something,,hey the wires that come off the injector harness and go down to the sensors below the manifold...I know you have done allot, but it took me like a year to find this. Only after sitting hot, would the heat shield expand and ground some stuff.

Mine was routed wrong, is now not near there! **** "professionals!