Question about 1999 Ford F150 Regular Cab
This truck has spark plug wiring. Have you REPLACED all spark plugs and wires with new? Have you cleaned the MAF sensor? don-ohio
Posted on Apr 26, 2017
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Posted on Jan 02, 2017
SOURCE: 1991 ford f250 5.8l VIN H
In all the technical data I have access to Snap-on, Mac, AllDATA and most service manuals all tell you to start with a wiggle test and clean all grounds.
Wiggle test means wiggle the wires and connectors while te engine is running and see if there is a change in performance. I suggest unplugging the connectors one by one and doing a visual inspection on them, look for green corrosion rust oxydized connections etc, add a little bit of di-electric grease and plug it back in, for the grounds that are bolted on remove these but be careful not to break off the rusty ones then use 400 grit sandpaper and shine up the mating surfaces add some di-electric grease and re install. Before you start to clean the connectors and grounds remove the neg off the battery, it will reset the check engine light if left unplugged for 30 mins
Posted on Mar 23, 2009
it's getting to much egr the egr has gone bad and needs replaced.
the diaphragm in the egr is leaking, and default position for air is defrost.so when you hit 3000 rpm you don't have enough vacuum.
Posted on Apr 30, 2009
When you say the fuel pressure jumps up and down and the engine stops,then you should look for wiring problems to fuel pumps.If you jump one fuel pump from battery and it runs o/k ,than you know you have a wiring problem from relay to pump.
Posted on Nov 07, 2009
Higher compression usually only happens when extra oil is introduced in to the cylinder.Your rings seem good due to the good compression .If there is a worn valve guide in that cylinder this would allow oil to seep into the cylinder .Also allowing for extra rocker arm movement which could be your chirping noise and cause a rough idle.The lean code sounds like something different like the is still a vacuum leak.It sounds like you know cars well ! I hope this helps
Posted on Nov 10, 2009
Does the egr vavle open ? You will need to use a scanner to test the dpfe voltage when the egr valve is energized you should read around 3.5 4.00 volts. Also you could remove the vacume line from the egr valve and with the engine running you should see around 100 rpm drop in engine rpm at least this would indicate the egr valve is capable of flowing egr gases through the system to the cylinders.
Posted on May 30, 2010
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