Mi 1995.5 Isuzu: 2 wheel drive, 4 cil, 2.6 lts. 180,000 miles keeps showing "check engine light" whenever I am riding at 30 to 40 mph in 3rd gear, 40 to 50 mph in 4th gear and 50 to 60 mph in 5th gear. At the same time, it can't pick up speed when this happens.
However, if I lift the foot from the gas pedal the light turns off and when I press it again it works fine for several minutes, until it lights up again if I didn't speed up.
It also turns off if I floor the gas pedal and the engine revs up (with a strange noise) to the upper speed shown above.
My mechanic doesn't find anything wrong with the engine, and since the light doesn't remain on, he can't retrieve any codes.
It only does this (light on and power diminished) within those speeds in those gears, and it's very bothering not to rely in a quick response, as I had for many years.
Please help, this problem have been going on for 3 or 4 months already.
have the same problem?
Monday, July 25th, 2011 AT 1:11 AM