Not likely. Most likely thru the head gasket, manifold gasket or a crack on the head, manifold or block. Needs to back track, do your work again looking for tel tale signs of where it leaked.
SOURCE: i got a code 1537 and 1538 showing on my obd2
I'm assuming you have the 4.2l v6. If this is the case, there are two intake runners per cylinder, one long (torque) one short (horsepower), default setting for these would be long runners or closed.
There is a valve so to speak inside the intake manifold operated by a motor that switches to the short runners when the RPM"s reach a preset point. However there has been a problem with this design, not only with the 4.2's, but the 2.5's and 3.8's and every other motor that uses this design.
The motors go bad, or the valve gets carboned up and no longer moves. If you have a 4.2 start there, if not I'm not sure what is wrong.
Good luck and hope this helps
SOURCE: Octane Ping and running lean
have you changed your spark plug wires and spark plugs , this could cause a miss fire, ( what you call spark knock / octane ping) or it could be a crack in your distributator cap and rotor
SOURCE: 1992 f250 occasionaly surges and dies when i stop at lights
there is a pressure feed back sensor going bad all the times
also check the two hoses connected to this sensor for crack or blockage
check the pipe that goes to the egr valve for crack
it won't hurt to pull the egr valve back out to check to see if there is any thing cause the valve to stay open
Testimonial: "thank you i will let you know if it works "
SOURCE: ford f150 2003 po171 always
Code Po171 indicates a lean condition on cylinder bank #1 of the engine. This is the drivers side of the engine. I would suggest replacing both front oxygen sensors as a pair to start. An oxygen sensor has a life span of about 5 years and yours are now 9 years old if they are original. When they get older they are slow to respond to changes in the oxygen content of the exhaust and can trigger a code Po171. If you continue to have the same code set after the replacement of both oxygen sensors then it is time to find out why your engine is running lean. Some of the most common causes are an ignition misfire and a vacuum leak. I have also seen Fords EGR flow sensor (known by Ford as Delta Pressure Feedback sensor) to cause problems like that as well. A good mechanic with a scan tool can usually spot a problem like that in a few minutes.
SOURCE: Have a 2001 Ford F-350 Super Duty 7.3 L Diesel...
Not sure if its a fix but we just replaced the lift pump on our 03 cummins with a fass fuel system man it starts like a champ now 03 being the first year they put the cp3 injection pump in removing the vp44 so i knew lillte to know chance it was the injection pump started with the lift pump.... runs great now so i guess just with the cummins i know diesels needs a good amount of fuel getting to the injection pump and it takes high PSI to unseat the ball in the injectors ..... We have a 01 Superduty the thing starts hard mayne not getting enough fuel im looking into it for now keep ya posted....
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