Engine Performance problem
1997 Mazda Protege 4 cyl Front Wheel Drive Manual 240574 miles
My car still runs great after putting a couple of repairs to it.
But there is one thing; engine starts perfectly fine in the beggining exept I noticed a lower rotations per minute (1000 rpms instead of 1300).
when I drive it and engine is warm, the engine idle decends at 500 quickly when I put my gear on neutral while the car is still rolling.
when I stop at a red light and apply the brakes, engine begins to rotate at lower 500-450 (the car would often rattle and sometimes stall when it rattles too much.
when you let go of the brakes while engine is warm and on neutral " while im parked'', rotations per minute would go up 1000.
I am also experiencing carbon buildup in the engine as well as on the muffler pipe and poor fuel economy.
I changed the spark wires and the car is preforming a little better but still same problem.
I did not open the idle control motor nor I have not spoted any holes in the air hoses.
for the past months I keep losing a little bit of oil in the engines before oil change.
i just want to know wt the problem might be.
real answers, real diagnostics
Sunday, June 21st, 2009 AT 12:06 AM