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1991 5.0 missing running rough and oil loss

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Old 08-14-2011, 10:18 PM
Junior Member
Join Date: May 2011
Location: Maryland
Vehicle: 1991 Ford F150
Posts: 4
1991 5.0 missing running rough and oil loss


I have a 1991 4x4 5.0 with an E4OD transmission 115,000 +_ miles. The truck has a miss that has gotten worse. I have changed plugs , wires rotor and cap. In addition I have replaced the vacuum reservoir that was shot, cleaned the throttle body , changed the fuel filter etc. I have had the codes pulled and I have got the following : 328,(EGR ) evap voltage, 332 EGR not opening, 542, Fuel pump ground and 634 Manual Lever Position Sensor. In addition to the missing I have found oil in the air cleaner, I replaced the PCV valve with a Motorcraft one when i discovered the oil issue. My question is this is the ERG issue causing both the missing and the oil in the air cleaner issues? or do I have more than one thing going one? I have the correct voltage ( 5.0) at the EGR sensor but I have not been able to test the sensor yet.

Any guidance would be appreciated.


Jim Barringer
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Old 08-14-2011, 11:27 PM
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Join Date: Aug 2010
Vehicle: 1990 ford f150
Posts: 505
im not sure if the egr would cause the oil but my buddys 94 5.0 ran rough at idle and had the same codes and we put a new egr valve on and it went away. nowhis egr came off easy my 90 i broke the egr tube and had to replace the whole thing so pb blaster the hell out of it
6 in a row makes it go. big block 6
1990 ford f150 xlt single cab long box 4x2 4.9 strait 6 b/w t18 4 speed 3.55
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Old 08-15-2011, 12:19 PM
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Join Date: Nov 2006
Location: Memphis, TN 38135, USA, Earth
Vehicle: 1983 Ford Bronco
Posts: 5,442
Those definitions aren't accurate or complete; read this caption:

Don't pick the name of a part out of the definition - read & post the WHOLE thing. The EGR can't cause oil in the filter, and it can only cause a miss near idle; not at highway speed. Read these captions:

. . . . . .
Walk softly & carry a BIG SIX ! ! !

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