i posted this once before and no one figured it out, but here it is again with some more information.
i have a 95 lebaron 3.0 automatic. When I drive the car I get the check engine light on at about 3-12 mile range. The code is 51 and that code is the 2 sensor ran lean for more then 8 minutes, or a vacuum leak.
now this is what I have done to try and correct the problem so far.
changed the 02 sensor at least 4 times last one is a mopar from Chrysler
changed the map sensor 2 times
changed the plugs
changed the tps
changed the fuel filter
changed the egr valve
changed all the hoses under the hood
changed the heads had a bad valve
changed all the gaskets and seals on the engine and trans.
changed the coolant temp sensor for the ecu.
also I took off the car and ran a pipe down through it to put a big hoke in the thing, now I know for sure it is not plugged. Someone told me that was the problem. Not!
had the hoses inspected again to make sure they were all good.
tested the fuel pressure while driving the car, it runs at 45-50 psi
tested the vacuum while driving the car, steady at 18"
ran the car with the evap canister plugged at the switch under the hood
ran the car with the egr plugged at the manifold and the base of the egr. Did not try it on the egr diaphragm yet. Forgot that hose.
checked the plug for the 02 sensor and it looked good and also measured the ohm's from each wire at the plug to the ecu to make sure the wire was not broken. And also measured the ohm's of different wires that were the same size and length to make sure I got the same readings. I did.
i did not run the car without the fuel pressure regulator plugged I figured that needed to be connected so the injectors would work properly. And I failed to plug the egr at the diaphragm but later I put a tester on that unit and it held the vacuum for over 2 minutes.
one ting tho was when I pulled the vacuum on that egr diaphragm I heard it snap and then I could see the little rod move back and forth when I put a vacuum on that line. So could a stuck egr diaphragm cause that code 51?
so now lets see if I have forgotten anything and if so tell me what I can test next? If not then can any of the mechanics kindly give me an idea of what might be wrong so I can get the fixed.
thanks for any more help and a repair! Bob p.
have the same problem?
Monday, September 5th, 2011 AT 9:43 PM