yo
The SPOUT thAng is another story; I have to go out soon, but will bbl today - I hope
DTC 47 - Measured air flow too low at base idle. Consider air filter, of course (think you changed it, right?), (
check for small vacuum leaks, injector o'rings, gaskets etc.)
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DTC 34 PFE or EVP circuit has intermittently failed above the closed limit of 0.67 volts or (KOER- above the closed limit of 0.67 volts)
was engine warmed up to norm op temp when you did the test?
DTC 34; FAILURE SYMPTOMS, Rough idle, pinging, overheating, loss of power, MIL light.
DTC 34/336 and 35/337 "...mean that the PFE voltage is too high. This could be the result of a clogged exhaust or
the PFE sensor itself; The PFE hose should be examined carefully. We have seen them with
pinhole leaks. This causes the exhaust pressure to bleed off giving an inaccurate reading to the PFE sensor. They can also deteriorate because of the corrosive exhaust gases they carry. This weakens the rubber and may cause porosity or cracks. A quick check is to hook a vacuum pump to one side and plug the other side to see if it can hold vacuum...."; read more on testing w/DVOM & vacuum pump
by tomco-inc.com
http://www.tomco-inc.com/Tech_Tips/ttt34.pdf
then;
DTC 33 & 34 "...DTC 33 is triggered when the EVP sensor is not closing, and a code 34 indicates no EGR flow. Any of these codes could indicate a faulty EGR valve as well..."
Source: by Larry C at
http://www.aa1car.com/library/egr.htm
DTC 31, 32. 33. 34. 35. 38 or 84 - EGR Valve Position (EVP) Sensor & EGR Vacuum Regulator Solenoid (EVR) Testing
Source: by Dustin S (Dustball, Mellow Yellow, Mr. Laser Boy) at
http://ylobronc.users.superford.org/documents/egr/
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Is Fuel Pump still running cont?
If it stays running with the Bronco turned off, then most likely you have a bad fuel pump relay;or the EEC Relay is hanging closed;
If the EEC relay goes bad, it could be sending the signal to the fuel pump relay to turn the fuel pumps on;
One easy test for this is:
Without the key in ignition, bump the starter over with the starter relay using a screwdriver. If it is the EEC relay, the truck will start without the key in the ignition
Timing (I know you know this.. the info you asked is in this quote)
Adjustment in Ford EFI Engines - "All TFI systems are timed in the same manor. The
engine must be brought up to operating temperature, and must be idling within spec. With the engine off the SPOUT connector must be removed. The SPOUT connector is a yellow wire near the distributor that either pulls apart with a wire connector, or has a little block that is removed (much like a spade fuse).
This connector, or block stops the PCM
from advancing the timing so an accurate base timing can be tested (
with the SPOUT plugged in, base timing could be off as much as 10 degrees). Connect a timing light as usual, (+) and (-) leads on the battery, and the pickup connector on the #1 cylinder’s spark plug lead. Mark off 10 degrees (unless the vehicle emission label says otherwise) wherever it is located on this vehicle (often on the crank shaft pulley, or under a rubber boot at the top of the transaxle). Start the vehicle and check timing. Adjust the distributor as necessary, and reinstall the SPOUT connector..."
