I have a 1994 Ford Ranger XL 2.3l 4 cylinder 5 speed manual trans 2 wheel drive standard cab. High milage 300,000+ uses no oil. I am experiencing an engine ping or rattle while trying to maintain speed up a long incline, 50+mph. If I do not let off the throttle and try to push harder on the trottle to maintain speed the engine loses power pings more and seems to start missing. Engine runs pretty well around town and idle is good.
I have checked engine compression #1 145 #2 145 #3 170 #4 170. I have not done a cylinder leak down test yet. I did try some seafome in the combustian chambers only and water injecting through a vacume port to lesson carbon deposits hopefully. I replaced Spark plugs, spark plugs wires, Mass air sensor, Egr presure sensor, egr vacume regulator, egr valve, and fuel pump. There are no codes on a scan tool I've done 2 tests koeo and koer (key on eng off and key on eng on ) I've also checked ingnition timing 10 degree's initial at idel and between 30-40 eng revved in netral. Fuel presure is 30psi and 40 psi with presure regulator vacume hose disconnected.
I'm not quite sure what part to throw at it next. I do have a NEW set of fuel injectors I will install but I do not think that will cure the problem.
Ignition coils, ignition control module, power train control module, speed sensor, throttle position sensor?
Any help would be great
Monday, February 21st, 2011 AT 12:22 PM