Got my aldl cable and did data log

[busafreak]

No need to be man, I appreciate your willingness to help and will test, run, check, whatever, in the name of troubleshooting this issue. I have owned this truck for about 4 months now, and have put maybe 400 miles on it after buying it. The parts installed a month ago. Previous owner did take care of it in a sense that they took it to a shop each time it needed maintenance, or something replaced. As an example a complete brake job was done in 1998 and it had 152k on the odometer. When I purchased it 4 months ago, it had 154k miles on it. Service records also confirm that it has hardly been driven in the last 10 years.
It is running rich as when I start it in the garage, the smell is strong. It has a broken stud on the driver side exhaust manifold that Im planning to get to soon. I dont drive it much, so its no big deal if I have to pull the head to get the stud extracted. Sorry for the long reading. Figured a little history on it cant hurt.
Yes after work today I will log in stages for 30 secs. Each. Thats a good idea. This is my first time logging anything like this, so I was unsure of how to go about it. And yes pass on that test procedure.

 

[SunlitComet]

Make sure the ignition switch is "OFF."

1. Disconnect the connector and coil wire from the ignition coil. NOTE: Do not insert the J 39200 probe into the ignition coil connectors. The female terminals could be spread and deformed, resulting in intermittent operation of the coil. Be sure to make contact with only the front edge of the terminals.
2. Connect J 39200 as shown in image, (1). Measure resistance using the high scale. The reading should be OL (infinite). If not, replace the coil.
3. Connect J 39200 as shown in (2). Measure resistance using the low scale. The reading should be very low or zero. If not, replace the coil.
4. Connect J 39200 as shown in (3). Measure resistance using the high scale. The meter should not read OL (infinite). If it does, replace the coil.
5. Reconnect the distributor lead and wiring to the coil.

 

[busafreak]

Do you have datamaster downloaded? Here's the .uni file that u can open if you have datamaster to see it in realtime. If not, give me a few as I try to figure out how to get a screenshot thru excel on this pos windows 7 that I cant figure out cause im so used to xp.. lol

 

[SunlitComet]

Downloading it now. It allows playback of files without purchase codes so I will look at it tonight.

---------- Post added at 09:29 PM ---------- Previous post was at 08:29 PM ----------

It worked.

What I see:

Computer does not see that the O2 data as being reliable

Advance seem to wonder when idling.

I personally would do the O2 sensor and check the distributor parts for excessive play or damaged or loose parts or burn thru. Start with that.

---------- Post added at 09:30 PM ---------- Previous post was at 09:29 PM ----------

Then retest after some driving. BTW not a bad program for OBD1.

 

[busafreak]

Yes I agree about the advance wondering at idle, but I figured it was doing that because of the rough idle. I did do the coil test and all was within specs. Tomorrow I will take off the distributor and inspect and test. I was suspicious of it since I did find it advanced when checking the timing.

Yesterday I was monitoring while driving and noticed o2 voltage spikes when going over pot holes. I will check and test the wiring and will replace the sensor anyway, as its probably the original.

Thoughts on the crankshaft position sensor? I dont know if I have anything as far as testing it on the service manual I have.

Yes datamaster is nice for data recording and monitoring. Im going to try the dyno just to see what it comes up with Lol. Thanks again. I will post with what I find.

 

[SunlitComet]

Shake them wires.

Your vehicle does not use a crank sensor it uses a device called ignition control module in conjuction with the the coil which provides that info to the computer for position and speed reference. It plays a role in ignition timing as well. so look at those connections when you inspect your distributor.

 

[busafreak]

Ok Sun, tested the coil, everything tests ok on it. Removed the distributor, took off the module and got it tested, passed all tests, tested the pick up coil, no problems there. Checked all wiring. Cap and rotor are new. Inspected dizzy shaft and gear, all good. Re installed, set the time again. Same miss, same low idle, same rich exhaust smell. Purchased some new acdelco wires. Tested the iac again, its working fine. Removed the temp sensor just to make sure its working properly and it is.

So I took off ALL of the vacumm hoses, checked, and fixed those that I found questionable. Purchased a tbi kit, took the tbi apart, cleaned, replaced all gaskets, re installed, set base idle, adjusted tps to .50. Put in a new fuel filter. Checked wiring on o2 sensor, all checks out. Thats the only thing I have not replaced lol.. After all that, same miss, same rich smelling exhaust.

My next step is to install some fuel psi gauges on the in and return to check the psi, and change that o2 sensor.

After that, if it doesnt fix it, Im gonna get mad and wave my fist at it.. lol

---------- Post added at 09:26 PM ---------- Previous post was at 09:16 PM ----------



---------- Post added at 09:40 PM ---------- Previous post was at 09:26 PM ----------

Btw, the truck runs great besides the idle issue, it runs even better with the tbi rebuild kit.

 

[SunlitComet]

Did that rebuild kit include a new regulator assembly?

 

[busafreak]

Yes it did and I also installed it.

 

[quietfly]

Damn you've been through alot on this.....

---------- Post added at 03:30 PM ---------- Previous post was at 03:18 PM ----------

silly question did you try replacing the ECM with a aftermarket one or even another stock one to see it the idle problem is there?. also did you try replacing the coil/ ignition system with a CID type one that fires multiple times under 2500 rpm. often they smooth out that slightly rough patch
more food for thought. If the idle RPM is the only rough patch, maybe your cam lobe is starting to get a little worn, is it a roller motor or a stock cam....