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93 ford e 150, 5.0litre,runs good cold,warms up-stumbles and hesitates

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Sounds like its running lean, I would check the fuel filters some of those have two the regular rund canister type and one in a black plastic housing mounted to the left frame rail
Also check to make sure the Coolant temp sensor is good if it thinks the car is cold when its acutally hot it sends the wrong signal to the PCM and therefor it will receive the wrong settings for injector pulse width, timing,
Also disconnect the spout connector for the timing it's a small plastic plug hrness often taped to the harness so ya gotta hunt for it sorry,about 1/2"x3/4" usually near the distributor or sometimes on the passenger inner fender pull it out and see if it runs differently warmed up and wile your at it set the ignition timing at EXACTLY 10 BTDC then reinstall the little plug,
Check the MAP SENSOR hose make ure it is not cut or loos mounted and is connected on one end to a direct manifold vacuum source, also check for any loose or cut or disconnected vacuum lines this can cause a 'LEAN" problem because the 02 sensor sees this and compensates by telling the computer more fuel is needed when it actually does not!
If you find this information helpful please rate me accordingly and please contact me if you need any further help. check out the BLOG and FAQ

Posted on Aug 10, 2008


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