North Austin/Round Rock - Looking for Ford Master Mechanic for EEC-IV & EGR troubleshooting

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05-14-2019, 12:17 PM

CZ Eddie

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North Austin/Round Rock - Looking for Ford Master Mechanic for EEC-IV & EGR troubleshooting

Round Rock/North Austin: Anyone know of a Ford Master Mechanic who won't just replace parts you've already replaced.
And will actually listen to the troubleshooting steps you've already taken?
And knows mid 90's EEC-IV & EGR system like the back of their hand?

As you can see below, I've already done a LOT of t/s on my own and need someone who will pay attention to that and not just start from scratch.

------------

Code 172 & 334.
I suspect the 172 is just a symptom of the code 334.

1994 Bronco
5.8L Windsor
E40D auto
192k miles
No mods that I know of.
Just bought it from a car lot a few weeks ago, issue has been present from day one.

Symptoms I get:

Runs smooth till it warms up.
Then when I stop at a light, the idle might suddenly drop from ~1k down to ~500 RPM and stumble.
Then pop back up to ~1k for a moment, then drop to ~500 again. And occasionally dies.
When this happens, sometimes the tranny will suddenly start shifting at really high RPM's with whiplash effect.

Things I've replaced in the last two weeks:

-EGR Vacuum Regulator Solenoid
-Coolant Temperature Sensor
-Idle Air Control Valve
-Throttle Position Sensor
-Fuel Pressure Regulator
-ACCEL Supercoil
-ACCEL Distributor Cap
-Ford Racing Spark Plug Set
-02 Sensor
-EGR Valve Position Sensor
-Replaced all vacuum hoses
-Cleaned PCV Valve
-Cleaned Throttle Body

Troubleshooting steps I've taken so far:

-Plugged Vacuum tester into EVR top line going to EGR and it held vacuum.
-Plugged Vacuum tester into EVR bottom line going to solenoids and it held vacuum.
-Applied vacuum to EGR while engine was running and the diagphram moved and engine idle changed.
-EVR 12V pin shows -12V on my multimeter.
-Shorted EVR's pin 33 to ground while engine running and the engine died.
-Applied vacuum to vacuum cannister AMP with MAN disconnected. It holds vacuum fine.
-When I do the KOER code test, the EGR does not move.
-Hooking a vacuum guage inline with cannister AMP shows "green" levels of vacuum (good).
-EVP shows 5v at pins VREF and SIG RTN.
-EVP shows ~3700 ohms at pins VREF and EVP and it goes down to ~350 when I apply 10hg vacuum to EGR.
-Disconnected IAC. Applied vacuum to EGR and engine RPM's stumbled as expected.
-Put Vacuum tester inline at EGR and raised engine RPM's, the vacuum does not register anything at all.

I'm sure I've forgotten a few things.
Any and all help would be appreciated!
If there are any sensors I should try replacing, then I can do that too.
E40D auto
192k miles
No mods that I know of.
Just bought it from a car lot a few weeks ago, issue has been present from day one.

Symptoms I get:

Runs smooth till it warms up.
Then when I stop at a light, the idle might suddenly drop from ~1k down to ~500 RPM and stumble.
Then pop back up to ~1k for a moment, then drop to ~500 again. And occasionally dies.
When this happens, sometimes the tranny will suddenly start shifting at really high RPM's with whiplash effect.

Things I've replaced in the last two weeks:

-EGR Vacuum Regulator Solenoid
-Coolant Temperature Sensor
-Idle Air Control Valve
-Throttle Position Sensor
-Fuel Pressure Regulator
-ACCEL Supercoil
-ACCEL Distributor Cap
-Ford Racing Spark Plug Set
-02 Sensor
-EGR Valve Position Sensor
-Replaced all vacuum hoses
-Cleaned PCV Valve
-Cleaned Throttle Body

Troubleshooting steps I've taken so far:

-Plugged Vacuum tester into EVR top line going to EGR and it held vacuum.
-Plugged Vacuum tester into EVR bottom line going to solenoids and it held vacuum.
-Applied vacuum to EGR while engine was running and the diagphram moved and engine idle changed.
-EVR 12V pin shows -12V on my multimeter.
-Shorted EVR's pin 33 to ground while engine running and the engine died.
-Applied vacuum to vacuum cannister AMP with MAN disconnected. It holds vacuum fine.
-When I do the KOER code test, the EGR does not move.
-Hooking a vacuum guage inline with cannister AMP shows "green" levels of vacuum (good).
-EVP shows 5v at pins VREF and SIG RTN.
-EVP shows ~3700 ohms at pins VREF and EVP and it goes down to ~350 when I apply 10hg vacuum to EGR.
-Disconnected IAC. Applied vacuum to EGR and engine RPM's stumbled as expected.
-Put Vacuum tester inline at EGR and raised engine RPM's, the vacuum does not register anything at all.

I'm sure I've forgotten a few things.
Any and all help would be appreciated!
If there are any sensors I should try replacing, then I can do that too.

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