I've had this little manual 5 spd four banger for about six months. It has an intermittent problem from running fine to just cutting out and losing 1/2 power then the next minute it is running fine. Ichanged plugs wires,cap and rotor, fluids, had a new exhaust put on piping from the cat back. Exhaust man says the cat is ok. Had codes read, possible ignition module or EGR. Ireplaced the module. Still acting up. Is the EGR a common problem that would cause these symptoms?
Have you checked for vacuum leaks at all lines and going to the MAP sensor? It also has a TPS(throttle position sensor) and CPS(crankshaft position sensor),I think.
I'm thinking vacuum leak or TPS. don-ohio
SOURCE: 1995 Ford Bronco 172 EGO not switching lean bank1- jerks when run
Have u checked for vacuum leaks or poss leaking EGR valve? use carb spray around the upper intake manifold where it bolts to the lower manifold, spray vacuum lines where they are connected to the engine vacuum ports, the idle speed will change if u hit a leak, as far as the EGR valve goes see if it gets hot at idle, if it does it is leaking, if all checks ok replace the O2 sensor, but i suspect u will find a leak at the upper intake plenum.
SOURCE: have 2005 ford freestyle. i towed to my shop,
Measure the exhaust back pressure. Do you have an old O2 sensor? If so just break the ends off of it so that just the tube is left sticking thru the center. Install it in one of the O2 ports and hook a vacuum/pressure guage to it. Should read les than 1 psi at idle and no more than 3 to 4 psi at WOT.
SOURCE: lack of power
These engines are pretty sensitive to the spark plug gap. Try replacing the plugs and making sure the gap is correct (even if they're pre-gapped. They're typically 0.055", but there should be a sticker under the hood that states the actual gap.
SOURCE: 1988 Ford Ranger Fuel Injected
Check the compression? You replaced all the items to make it run. remove the air filter and check? If compression is below 90 then bad rings or valves. Check the fuel pressure. to see if you have bad rings with low compresion spray oil in cylinders, if pressure goes up it's the rings. If nto it's the valves.Try these and let me know.
Randy
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