1990 Crown vic Erratic idle and acceleration

[chefbaker]

We have A 1990 Crown Victoria. I found a broken vac hose and replaced it. Now it has erratic idle and almost stalling acceleration. Any ideas anybody.

[kuriogb]

It could be your air flow sensor. From your air filter to the engine will be some air duct. To this duct work there will be an electronic wires connected to the air flow sensor. Disconnect these wires and see if this helps your acceleratin issue. Id so, clean or replace the air flow sensor.

[phantom_smack]

Try disconnecting the battery to clear the adaptive learning strategy.It was compensating for the vacuum leak and may not straighten out right away without clearing it.

[p71ridinhigh]

clean your throttle body!!!

[BroncoJoe19]

Good one Phantom_smack ! I hadn't thought of that.

Pull Diagnostic Trouble Codes (DTCs) From your onboard computer.
Your engine and transmission are computer controlled.
The computer uses sensors to tell it a number of different things and it controls actuators that push or pull mechanical levers (kinda). If one or more sensors aren't working properly, the computer goes "blind" and doesn't know what to do. If the computer can "see" but one of the actuators is broken and therefore can't follow the commands of the computer; the engine won't run correctly. The computer is preprogrammed with set values for each of its sensors, and each of its actuators. It will run a self check of all systems, like the space shuttle; it will compare its set value(s) to the value(s) it recieves from its sensors, and actuators. If any sensor or acutator is out of the "normal" range the computer will generate a "code." It will generate some codes on the fly, and others will be stored while you are driving. There is a simple method to "pull codes" out of the computer for one to use for diagnostic purposes.

Earlier versions of On Board Diagnostics OBD 1983-1995 can flash the error code to the dash board and can be pulled in one's driveway without any special tools.
Later versions of On Board Diagnostics OBDII some 1995, and pretty much all 1996 and newer, require one to use a code reader or scanner tool.

Some auto parts stores will scan your engine codes for FREE, you may want to call around. Some will scan OBDII but not the older (prior to 1996) OBD systems.

SO here you go...
How to scan FORD on board Diagnostic Trouble Codes (DTCs) in your driveway
Howto Pull Codes 1983-1995 Mustang, F series Trucks, Econolines, Broncos, 302, 351 and more