thank you all for the information. im in the process now of verifying my transmission and checking grounds i found that my main battery ground cable that attaches to the frame and then the block is all sorts of falling apart. so for now i ran another ground to a bolt on the headers just as a temporary fix. i have replaced my spark plugs and injectors which did make a slight defference but not much. I have checked codes again just to see if anything has changed and i only get for codes now. 29,34,42,77 so i am now going to do the egr valve test just waiting for payday to get a vacuum pump and a few other tools. i will keep you all posted thanks again for all the ideas and info.
yo!
You can "borrow' a hand-held vacuum pump w/meter attached At local parts stores w/ a fully refundable deposit.
DTC 34 - EGR voltage above closed limit - Failed sensor, carbon between EGR pintle valve and seat holding the valve off its seat. Remove the EGR valve and clean it with carbon remover. Prior to re-installing see if you can blow air through the ****** side of the EGR by mouth. the egr is not closing properly which can cause detonation. remove the egr and clean off any carbon built up on it with carb cleaner and a brush if necessary.
Source: by miesk5 at Ford Bronco Zone Forums
DTC 42 O2 sensor voltage was stuck high for too long. (Rich).; "...42 O2 sensor voltage was stuck high for too long. (Rich).
Bad O2, or it's connector/wiring bad MAP sensor,
Bad fuel pressure regulator, pull vac hose off, any gas in it or gas aroma means it's bad
Leaking injectors,
restriction in fuel return line,
or exhaust leak or clogged exhaust, lowering vacuum
DTC 41,
42, 85 OR THREE DIGIT CODES 171, 172, 173, 179, 181, 182, 183 & 565 are received ,
Check for proper HEGO Ground; in Catalytic Converter Diagnosis TSB 91-12-11 for
86-91 Bronco, F Series, & Econoline
by FordISSUE: Lack of power or a no start condition may be diagnosed as an exhaust restriction caused by a plugged catalytic converter. A plugged catalytic converter (internal deterioration) is usually caused by abnormal engine operation.
ACTION: Diagnose the catalytic converter to confirm internal failure. Refer to the Catalyst and Exhaust System Diagnostic Section, in the Engine/Emissions Diagnostic Shop Manual and the following procedures for service details.
SERVICE PROCEDURE
1. Lack of proper HEGO operation may cause, or be the result of a rich or lean fuel condition, which could cause additional heat in the catalyst. Perform self test KOEO and KOER, service any codes.
NOTE: IF TWO DIGIT CODES 41, 42, 85 OR THREE DIGIT CODES 171, 172, 173, 179, 181, 182, 183 AND 565 ARE RECIEVED, CHECK FOR PROPER HEGO GROUND.
If the HEGO ground is good, the following areas may be at fault:
* Ignition Coil
* Distributor Cap
* Distributor Rotor
* Fouled Spark Plug
* Spark Plug Wires
* Air Filter
* Stuck Open Injector
* Fuel Contamination Engine OIL
* Manifold Leaks Intake/Exhaust
* Fuel Pressure
* Poor Power Ground
* Engine Not At Normal Operating Temperature
* HEGO Sensor
2. Spark timing that is ******** from specification may increase exhaust gas temperature and shorten catalyst life. Refer to the following procedure for service details.
a. Check spark timing. Check base timing with spout disconnected. Set base timing to the specification on the vehicle emission decal.
b. Check computed timing with spout connected.
NOTE: COMPUTED TIMING IS EQUAL TO BASE TIMING PLUS 20° BTDC ± 3°.
3. Misfiring spark plugs may cause an unburned fuel air mixture to pass through the catalyst, which could cause higher than normal catalyst temperatures. Refer to the following procedure for service details. Check secondary ignition, hook the vehicle up to an engine analyzer and check for a secondary ignition misfire.
NOTE: SERVICE ANY ITEM THAT IS NOT PERFORMING AT PROPER SPECIFICATIONS BEFORE CONTINUING.
4. Fuel pressure that is too high may cause rich air fuel mixtures to pass through the catalyst which could cause higher than normal catalyst temperatures. Refer to the following procedure for service details.
a. Check fuel pressure, install fuel pressure gauge, start and run the engine at idle. Fuel pressures between 28 and 34 PSI are typical (4.9L typically is 15 PSI higher).
b. Disconnect the vacuum line going to the fuel pressure regulator. Fuel pressure typically jumps to 40 PSI ± 3 PSI (4.9L typically is 15 PSI higher). Visually inspect vacuum line for raw fuel.
NOTE: FUEL PRESSURES ABOVE THESE VALUES SHOULD BE CORRECTED. HOWEVER, THIS MAY NOT BE THE CAUSE OF THE CONCERN. SERVICE AS NECESSARY.
5. Throttle plates in the throttle body not returning to the proper closed position may cause excessive catalyst temperatures during downhill grades. Refer to the following procedure for service details. Visually inspect the throttle body and linkage for:
* Binding or sticking throttle linkage.
* Tight speed control linkage or cable.
* Vacuum line interference.
* Electrical harness interference.
NOTE: AFTERMARKET GOVERNORS, THROTTLE LINKAGE AND CABLES ASSOCIATED WITH POWER TAKE-OFF UNITS, MAY ALSO INTERFERE WITH PROPER THROTTLE RETURN. SERVICE AS NECESSARY.
6. It is extremely important that all systems related to the engine and emission systems operate properly.
a. Visually inspect the engine compartment to make sure all vacuum hoses and spark plug wires are properly routed and securely connected.
b. Inspect all wiring harnesses and connectors for insulation damage, burned, overheated, loose or broken conditions.
c. Verify proper operation of the thermactor system. Thermactor systems that fail to dump thermactor air to the atmosphere properly or at the correct time can cause high catalyst temperatures.
d. Visually inspect thermactor system for damaged or kinked hoses and perform a function test on following components: air control valve, check valve, silencer, filter and the air bypass solenoid.
e. Verify proper operation of the engine cooling system thermostat.
OTHER APPLICABLE ARTICLES: NONE
WARRANTY STATUS: Eligible Under Basic Warranty Coverage, Emissions Warranty Coverage
OPERATION DESCRIPTION TIME
911211A Diagnostics - Perform KOEO And KOER Self Tests 0.5 Hrs.
911211B Timing - Check Or Adjust Spark Timing, Check Computed Timing And Check Secondary Ignition System With Engine Analyzer 0.5 Hrs.
911211C Check - Fuel Pressure And Inspect Vacuum Line For Raw Fuel 0.2 Hrs.
911211D Inspect - Throttle Body And Linkage 0.1 Hrs.
911211E Inspect - Vacuum Hoses, Electrical Harnesses, Connectors And Spark Plug Wires For Routing Damage 0.1 Hrs.
911211F Thermactor System - Inspect For Proper Operation And Damaged Component. Includes Function Check Of Air Control Valve, Thermactor Air Bypass Solenoid, Check Valves, Silencer And Filter 0.3 Hrs.
911211G Thermostat - Check For Proper Operation 0.2 Hrs.
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Another quick way to check a converter is to simply strike its case with a RUBBER mallet, or the side of your fist (if the cat is cool). If the substrate is shattered, there will be an obvious rattle.
* Poor Power Ground;
Ground Location in an 89: "...it's not near the sensor. It sticks out of the loom of the wiring harness that traverses the back of the engine. You can find it by putting your hand around the loom and following it across the back of the engine. You can also use a mirror. I had to lay on top of the core support to reach mine. Trust me it's there. It serves only as a PCM ground for the O2 sensor. It isnt hooked to the sensor, it comes out of the PCM..."
Source: by j. r. Nice (J. R. N)
"The ground for .... O2 sensor is on the top of the bell housing where it bolts to the engine block. Its a 18 gauge orange wire..." by RescueBronc
Source: by miesk5
DTC 77 - failed to perform brief WOT dynamic resistance test. Need to press gas pedal during KOER; Operator didn't execute WOT when told to during self test