Good job.
22 - BP sensor out of test range.
The guy probably just hooked up the BAP line to the MAP sensor. Get a BAP sensor.
53 - TP Circuit above maximum voltage.
Check your TPS voltage. It should be .95 V or so at closed throttle and move up to 4.6 V at WOT. No skips or flat spots as you move the throttle slowly from closed throttle to WOT.
54 - ACT sensor circuit open.
You need one hooked up.
35 - PFE or EVP circuit above maximum voltage.
Has your EGR valve been removed? If it has, you at least need an EGR valve position sensor hooked up to prevent the computer from staying in open loop mode.
67 - Neutral/drive switch open.
This is only a problem if you have the cruise control on and knock the shifter out of gear. The engine will just start reving at the rev limit.
81 - Air management 2 circuit failure
I'd guess that this is why moving the MAF around helped the engine get started. Check your wires to see if there is a bad one.
82 - Air management 1 circuit failure
See above.
85 - Canister Purge circuit failure
Not a big deal.
95 - Fuel pump secondary circuit failure - ECA to ground
This could explain your code reading problems and the necessity to ground your code reader to the negative battery terminal.
51 - ECT/ACT reads -40 degrees or circuit open.
You need an ECT hooked up.
52 - Power steering pressure switch open
Hmm, now that I've looked at all of these again and can see the pattern, my guess is that you have a loose ground wire somewhere. Just in case you want to verify each sensor, here are a couple pictures to aid with sensor location.
Most of those sensors are after those two big connectors that are normally mounted on the back of the intake. They're the connectors that go to all of the fuel injectors. I'd start checking there. Make sure that they didn't come unplugged.
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351W 89 Mustang GT Convertible
[This message has been edited by jimberg (edited 08-17-2001).]