Quote:
Originally Posted by serge_saati
Normally a small vacuum leak at intake wouldn't cause this symptom.
But a very big vacuum leak or a bad MAF sensor can cause that. Cause the more you press on the gas, the more air enter in the engine. If the MAF doesn't meter all the air correctly, PCM will not give enough pulse to injector so they can't spray enough fuel, so the excess of oxygen reduces the power of engine since there's more compression w/o enough combustion.
Clogged injector and low fuel pressure can cause that too.
It doesn't sound like bad O2 sensor.
So first check if MAF tube's collar is properly tighten and air filter properly installed w/o leak. Then test MAF sensor operation with a multimeter.
Then finally test fuel pressure. See if the problem happen only at high engine temp or always.
|
Hello thanks for your time and help. Actually as you mentioned the problem happens only at high engine temp, I started the engine this morning and revved it up and it works fine no problems. The air filter is OK I forgot to mention that I replaced it yesterday when the engine started to lack of power the old one was nearly dark gray in color and it was slightly smaller than the right one; the one I put fits tight in there it is the right size.
How should I check the MAF sensor and what pressure should I expect from the fuel pump?.
Thanks in advance for your help.
P.S. I already changed the fuel filter too.