Question about Cars & Trucks
Will miss and backfires until it warms up
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Posted on Jan 02, 2017
SOURCE: 93 ford e 150, 5.0litre,runs
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!
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Posted on Aug 10, 2008
The best thing to do is make sure the freon level is good ,if that ok then ckeck the pressure with a set of a/c gages if the high side pressure are lower than 350psi and the low side is higher than 35psi and the compressor is shuting off the low pressure switch is bad.
Posted on Jul 29, 2009
I have an 87 Jeep Wrangler 6 cylinder and I have the EXACT same problem.
If you figure out what it is/was, PLEASE LET ME KNOW ASAP!
Posted on Jan 29, 2010
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