Engine Performance problem
1990 Dodge Omni 4 cyl Front Wheel Drive Automatic 21000 miles
I recently purchased a 1990 dodge omni with 20k miles, garage kept and rarely used over the past 10 years. Most use was merely running engine less than 2k rpm. Engine runs fine most of the time. Sometimes when coasting or decelerating it loses power and the only way to make it continue is by pumping the accelerator as rapidly as I can with poor results. I may be able to limp along at 20-30mph. If I let is sit for a few minutes, or hours it will get over it and resume normally. When this event takes place the tack will show dramatic fluctuations and oscillate between 1-2k rpm. Thinking possibly, the fuel pump or sock was an issue, I changed the sock. I changed the fuel filter. No change. I installed a gauge in a tee and measured fuel pressure, 18lbs. The book says normal is 34-38 lbs. I pinched return line and pressure went to 38lbs. There is a receipt in the glove box indicating the fuel pump was replaced within the past couple years. I replaced the fuel pressure regulator, no change. The vacuum lines seem to be flexible with no brittleness. It also appears to me all lines and electrical connections are in tack. What's next?
Saturday, April 25th, 2009 AT 9:27 AM