27 Mar 12 20:55, Mark Hofmann wrote to Roy Witt:   
      
      
      
    RW>> Once you get those plugs/wires changed, you might want to take a   
    RW>> look at having the MAF and O2 sensors tested. The MAF gets   
    RW>> contaminated by all of the particles in the air and oil (if you use   
    RW>> an oil impregnated filter) and looses it's ability to accurately   
    RW>> report to the ECM. At the same time, O2 sensors get carbon build up   
    RW>> and when the two are out of spec, the A/F ratio gets screwed up and   
    RW>> the ECM can't control how much time to leave the injector's open.   
      
    MH> Right, I do plan to load the ECM software on my tablet/netbook   
    MH> computer, connect it to the Durango and take it for a drive.  It is a   
    MH> delicate operation when cleaning the MAF sensor.   
      
    MH> Normally, the O2 sensor will throw some type of code - especially if   
    MH> you have more than one of them.  I have seen a dirty MAF causing low   
    MH> readings and throwing everything off.  They are not hard to clean -   
    MH> just have to be careful.   
      
   An O2 sensor won't give you much of a warning. It just loses its ability   
   to perform as intended, messing up the MAF/O2 loop reading. i.e. my Z28   
   used to give me fits with O2 sensor codes (check engine soon), but that   
   stopped after changing the 'brand' of fuel used.   
      
    RW>> All of those sensors have sealed connections on them, so you won't   
    RW>> bother them very much unless you use the power washer to directly   
    RW>> clean them off. Any overspray won't hurt them at all. Since you   
    RW>> don't have a distributor anymore, there's no chance of getting it   
    RW>> wet.   
      
    MH> You never had a problem with the power washer ripping through a wire?   
      
   Insulation? No. Sealed connectors, no. Cars with non-sealed distributors,   
   yes. Cars with old frayed wiring (no insulation left on them) no. At least   
   not as long as they weren't hot wires touching ground.   
      
    MH> That is my other fear.  There are so many wires and things in the   
    MH> engine compartment these days.   
      
   Don't aim at them...   
      
    RW>> If there is a MAF in the hose from the air cleaner to the throttle   
    RW>> body, check it too. It may have a clogged screen, which will also   
    RW>> give you fits if it's dirty. Be very careful when handling that   
    RW>> thing, as it's a very sensative device. Replacement costs are around   
    RW>> $200...   
      
    MH> Yes, they are expensive.  I had to replace one years ago in my 85   
    MH> Camaro. They are not cheap.  The good thing is, they normally only   
    MH> need cleaning vs. replacing unless you damage the wire(s).   
      
   I put a high performance Granateli MAF in my Z28 back in 2001/02...it's   
   still going and I also kept the original, stored in the Granateli box...   
      
      
                   R\%/itt   
      
      
     ... Only those who will risk going too far can possibly   
     ... find out how far one can go ~ TS Eliot   
      
      
   --- Twit(t) Filter v2.1 (C) 2000-10   
    * Origin: Roiz Flying \A/ Service * South Texas * USA * (1:387/22)