Got a few problems going on here with the Topaz. I'll start from the beginning and try to keep it brief
- Tune up last year (Spark plugs and wires, cap and rotor, fuel filter): Starting problems began soon after... coincidence? Seems like the the car is not getting any gas when its first started. Have to leave the key in in the on position for 5-10 seconds before starting for the engine to catch.
- Few months later: Started to surge at idle when in drive, simple solution was to put it in park or neutral at stops
- Month later: Surging problem became worse and now have to rev to keep from stalling, even in neutral
- Couple months later: Driving around, car bogs down even with wide-open throttle. Can only get up to about 20 km/hr and gear changes are rough. This is intermittent at this point, sometimes the throttle doesn't respond - sometimes it does. Once it stalls out, it fires right back up and runs well for a couple minutes before happening again. Idle problem is now constant.
- Few weeks later: Car sits as we try to diagnose issues. Runs like shit as seen in the video links:
: Startup, rough idle and eventual stall
: Nasty noise from the rear-end, throttle is floored and no response
Here is what we have looked at so far…
-OBD tests (KOEO) with the Ford tester: No current codes, continuous codes were:
122 (TPS below min. voltage)
157 (MAF sensor)
172 (Oxygen sensor fault/lean)
186 (Fault Injector Pulse)
211 (Profile Ignition Fault)
332 (Insufficient EGR Flow)
556 (Fuel Pump Relay Fault)
-OBD test (KOER) – code 412 (unable to control RPMS) Guessing the idle is too rough for this test
-Checked for spark and plug condition: plenty of spark, plugs are relatively clean (bit of oil), gap is perfect
-Cleaned egr (pin was seized), throttle body (very gunky), and IAC in hopes of a smoother idle
-Checked TPS sensor with a multimeter: ~5V reference, ~ 1V at closed, ~5V fully open. Test checked out perfectly. We put a brand new one in to make sure and nothing seems to have changed.
So basically, my best guess is a fuel problem or maybe a vacuum leak? Maybe a bad fuel filter or air trapped in the system when it was changed? Fuel pressure regulator? Could be a million things... My head is spinning with the possibilities, so hopefully somebody can maybe point me in the right direction from previous experience.
Is there a way to test the MAF sensor, or just buy a new one and hope for the best?
Thanks a lot!