88 RANGER BOGS DOWN
 

does anyone have any ideas i have a 88 ranger and it bogs down at 4000 rpms and when i give it gas it sounds very loud through the intake a lound sucking sound. I have replaced plugs,wires,cap,rotor,coil,coolant temp sensor,cleaned and tested injectors,cleaned egr,replaced fuel filter,cut off converter, checked all sensors. If anyone has any ideas it would be great. thanks

RE: 88 RANGER BOGS DOWN
 

Which engine? You don't mention anything about checking the intake system. I would check to make sure that the problem isn't intake starvation. I would also check for vaccum leaks. The IAC can compensate for some, but the 88 uses a MAP sensor and SPEED DENSITY to adjust fuel mixture. Good luck and let us know how you make out.

RE: 88 RANGER BOGS DOWN
 

IT IS A 2.3 LITER 4 CYL. WITH A 5 SPEED MANUAL. IT DOESN'T HAVE ANY VACCUM LEAKS THAT I KNOW OF. I TOOK OFF THE FULL INTAKE AND CHECK AND CLEANED IT AND IT LOOKS GOOD. I REPLACED THE MAP SENSOR AND THE IAC LOOKED GOOD.