Question about Ford Ranger
I have done a complete tune-up and also replaced the engine control module. Tune-up with new wires, plugs, distributor sending unit, air filter. I do not have any check engine light or indicator there is a problem. The hoses seem OK in the emissions but I may be wrong. Can anyone tell me what the problem might be? While driving the truck will lope and when descending in speed it has a slight buck. It wants to stall out when I take off from a dead stop. Idles fine, starts OK, but when driving or trying to drive it will hiccup, lope, stumble. Thanks for any help you can give. There are 136,000 miles on the truck.
Posted by Anonymous on
The problem could be plugged up catalytic convert it is related to tune up.One more thing fuel filter too. Check auto zone if they have anything to burn out catalytic.When you change with standard catalytic you will have code PO420 will be a headache!!!!!!!! 80% cars have this problem Think twice before doing anything.
Posted on Apr 14, 2017
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Posted on Jan 02, 2017
Mine does the same thing when the oxygen senor goes out... About every 70k miles. doesn't always turn on check engine light
Posted on Feb 16, 2009
SOUNDS LIKE A VACUM LEAK,POSSIBLY INTAKE GASKET OR VACUM HOSES,GET SOME BERKIBLE 2+2 SPRAY DOWN INTAKES WHERE MEET HEAD AROND THROTTLE BODY AND ALSO EGR VALVE TO MAKE SURE IT ISN'T PARTAILY STUCK OPEN, VACUM LINES AIR INTAKE HOSE BETWEEN THROTTLE BODY AND AIR FLOW METER,ALSO MAKE SURE ITS NOT DRY ROTTED AND SUCKING AIR,THE ENGINE IDLE SHOULD GO UP OR DOWN DEPENDING HOW BIG THE LEAK
Posted on May 17, 2009
I had a similar problem on my 2002 Impreza RS 2.5 (same engine and engine control system). In my case it was the O2 sensor on the intake manifold. This happened at 34,xxx mi. so it was covered by the warranty. Replacing the part is very easy. (two bolts and a wiring harness). Obviously I would start simple and cheap and work your way to expensive and difficult.
From my understanding its all caused from the engine missfiring. If its been a while or never, I'd change the spark plugs first. (stick with the Subaru Parts plugs, I went after market and the dealer claimed the plugs were not the correct "temperature" and had to pay for the new plugs and install although they did it without my permition. Thats a whole nother story).
Could also be the manifold pressure sensor.
Either 02 or manifold pressure sensor may cause intermitent check engine light.
Where I live Brookline,MA , Autozone will run a free diagnostic on your car by hooking up to your ECU and will give you the trouble codes and possible remidies. Of course there are no guarentee's but it will point you in the right direction.
Posted on Jun 18, 2009
Check vacuum leaks , by spraying carburator cleaner around intake manifold gasket and vacuum hoses connections . See if engine picks up the idle speed while you doing it , and if it does , locate leak and fix it. Most common , intake manifold gasket brakes.
Posted on Jul 20, 2010
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