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The QD for the heater core hose is between the TBI and the distributor and is threaded into the intake manifold.Is the QD actually in the intake or does yours have the spreadbore adapter/riser under the TB?
I will do that test with the TPS and see what it reads.Check your TPS more closely...
TPS:
- Turn off the engine
- Turn on the ignition
- Start the scan too
- Look at the TPS readings
- Slowly move the accelerator to WOT and back, and do it a couple of times while WATCHING the TPS numbers; they should increase and decrease smoothly. If they ever jump, there's a problem.
Your min TPS looks OK. Max should be around 4.5V, give or take.
Baro reading... you said "Baro (inHg) - 25.3". What's your elevation, 4000-5000ft? Near sea level BARO would read ~30.
MAP: At idle, I might expect to see the MAP at around 10"Hg. Let's see what others say.
You can test the MAP sensor akin to how the TPS is tested.
- Put a vacuum pump on the MAP sensor's input port/hose, then
- start with igntion off
- Pump to a target value
- Turn ignition on
- Check the BARO reading with the scan too; the reading should jibe with the vacuum applied by the pump (taking into account the difference b/t "vacuum" and absolute pressure of course)
- Repeat this process, starting with ignition off, for as many different vacuum settings as you like.
Example: Assuming you're really at 4000-5000ft like your stated BARO reading in your original post suggested:
- Apply 0 vacuum to MAP; BARO reads 25.3
- Apply 5" of vacuum; BARO reads 20.3
-Apply 10" of vacuum; BARO reads 15.3
- Apply 15" of vacuum; BARO reads 10.3
(you get the idea)
But I'll do the vacuum test and see what it reads. See if the numbers change like they should.
I will check the TPS. That is code 22 which is one that is current.I suspect you may have a TPS problem. It’s easy to check.
I don’t suspect a MAP problem but since you’re testing…
VSS provides, IIRC, a time varying voltage whose frequency corresponds to the speed. The voltage may increase with speed as well, but it’s the frequency that’s measured by the ECU.
I’m curious to learn why the ECU reads non-zero when you’re stationary. Others may comment.
Methods for testing the VSS are given in the FSM, I’m quite certain. Go that route.