Quote:
Originally Posted by Vtx531
I did not recalibrate the throttle. How do I do that?
After replacing the AOS I just cleared the codes. Then it idled extremely poorly for about 60 seconds and then smoothed out.
Is there a specific place that I should connect the vacuum gauge?
I thought hesitation under load would suggest something other than a vacuum leak because there is minimal vacuum with the throttle open?
Seems odd to me that the fuel trims would be worse now! About +50% total seems pretty extreme and I don’t know if a MAF sensor would be that far off. At last not just from being dirty I wouldn’t think. I need to pull it and see if it is a cheapo crap brand like the other parts that have been replaced by the PO in the past.
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To recalibrate your throttle: I would disconnect the battery for say half an hour. Then reconnect battery.
Turn key to on position for one full minute:
Do not start:
Do not touch throttle:
After one full minute turn key off for at lest ten seconds.
Start car: let it idle tell the idle smooths out.
Should be good to go.
Yes with throttle open you have minimal vacuum but you are still getting some unmetered air. So your still lean so you can "possibly" get hesitation.
Most vacuum gauges come with a tee fitting and some hose so you just need to find a vacuum hose on the intake that you can tee into.
If vacuum reading is good: other things to look at:
Possible exhaust leak ahead of O2 sensor: (could be drawing 02 into exhaust ahead of sensor)
Fault with the MAF sensor (as you mentioned)
or wiring from the sensor to the DME.
Fuel:
Pressure and volume. I believe there is a Presta valve on the fuel rail that you can hook a fuel pressure gauge to. Usually they have brass cap on them.
I can look up the pressure specs. for you if you need them.
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