Thread: could two o'rings make that much difference?

Before driving north to Gayndah, towing a heavy trailer, I decided to go over the vehicle, namely the AAP,MAP/IAT & MAF sensors, gave them a good spray of MAF cleaner, also sprayed all connections, [ they were fairly clean, I do it every service. ] One thing I noticed, the AAP & MAP/IAT o'rings had flattened , and the sensors were not really a tight fit in their housings. Now the vehicle just passed thru 370,000 kms. Changed the o'rings, and it drove like a different vehicle. Could those o'rings make such a difference? Bob

Originally Posted by OffTrack

If you believe RAVE you are meant to replace the o-ring on the MAP every time you disturb it.

The only one the local bearing shop had was looser than the original so I threw away the replacement and haven't bothered since.

You'd get a small boost leak with around the MAP if the o-ring was really bad, but can't imagine it would have a significant negative effect. Same with the air box sensor - you get a leak but it will still be measuring the pressure reasonably accurately, so no real reason that replacing the o-rings would make a big difference.

Could well be that removing and replacing has cleaned the contacts on the connectors.

I did remove the units from the connectors, and sprayed with MAF cleaner. I tend to believe RAVE, have used it often, along with other inputs from here & elsewhere. I will be replacing the O'rings in the future, as per RAVE, & Haynes. Cheap insurance. Bob