Vacuum hose going to the pvc valve was busted, but the car would run. Replaced the hose, and car will not idle, immediately dies. Put the old vacuum hose back on it, and will run. We also replaced the pvc valve but still will not idle. Any suggestions?
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Re: vacuum hose busted
Sounds like the computer system readjusted it self to the specific air measurements that the busted hose was allowing in to the engine.(This is only relevant if you have a 1987-up) turn off the car, remove the battery cables, and let sit for 45 min, this is ample time to reset the computer memory. Reattatch cables and start. It may run rough for a few miles but if after say 50 miles of driving, if it still wont idle, than you may need to replace sensors. (MAF, intake sensors, O2 sensors, etc..)
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I'd start by looking for a vacuum leak, often associated with the PVC valve. Make sure the PVC valve is not obstructed. Possible dirty air filter.
How long since regular Preventive maintenance was done?
I believe you Ford dies while idling is because it's idle is too low, adjust the idling you will notice the change from the sound of the engine and base on the speedometer to see how high the needles goes up, don't go over 2 lines.
The lines going to the PVC are what you would have to remove and check with a Vacuum pump or Vacuum source. Close off one end with your finger and apply Vacuum to the remaining end.
The engine and its cavities produce a Vacuum pressure when the engine is running to draw in vapors from the oil system. Therefore any hose connected directly to the PVC valve will vent through that system so you will need to test the parts off of the engine.
The PVC valve is a cheap part and usually does not break between replacement intervals. Because of the spring valve inside this part, it is to be replaced at intervals just like an air filter.
1. Vacuum leakage Check throttle body and intake manifold for tightness. check all vacuum hoses.
2. Faulty fuel or pump or electrical.
3. Plugged PVC valve.
4. Air filter clogged
5. Leaking head gasket.
6. Camshaft lobs worn.
All of these porblems can cause lopes or erratic idle.
REMOVE PVC VALVE WITH VACUUM HOSE STILL ATTACHED CHECK FOR VACUUM AT PVC VALVE PLACING FINGER OVER IT.IF NO VACUUM FROM PVC VALVE BUT THE HOSE TO PVC VALVE HAS VACUUM REPLACE PVC VALVE.IF NO VACUUM GETTING THROUGH PVC HOSE AND VALVE.LOOK FOR DISCONNECTED BROKEN VACUUM HOSE OR OBSTRUCTION IN VACUUM HOSE BLOCKING OFF VACUUM.
It sound like your idle air control (IAC) valve is dirty and the fuel injectors. Try cleaning the throttle body and IAC with throttle body cleaner, if it's really bad you may have to use two cans of throttle body cleaner to make sure you have all of the carbon and varnish cleaned out. If this does not help, then there is a good chance that the IAC has gone bad and needs to be replaced but also check the wire harness to the IAC and TPS on the throttle body. Good luck and hope this helps and it would not hurt to replace the fuel filter also.
Your IAC may be defective, first check the canister purge valve by removing the large hose off the charcoal canster and plugging the hose with a bolt or something you can fit into it, then try it also check PCV valve and see if it's bad. there are more things to check like fuel filter fuel pump and or fuel strainer if fuel tank but would need to have more information to help.
sound like intake leak. get a scanner to see if egr valve not staying open . check map sensor + make sure the vacuum line didnt come off it . check coolant sensor. oxygen sensor .check fuel pressure regulator. check vacuum line that goes to fuel pressur e regulator . make sure there is no gas in it. make sure its getting vacuum. check pvc valve.shake it make sure it rattle .