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Thread: Chasing a power loss - resolution

  1. #1
    Join Date
    Feb 2010
    Location
    Townsville, QLD
    Posts
    2,456

    Chasing a power loss - resolution

    Hey guys,

    Thought I'd throw up my issue and resolution from a power loss I was chasing for a few months. I thought about it a fair bit before jumping at things or throwing money at parts.

    So the short version, last year I had a misfire, jumped on the nanocom and found a few cylinders missing (where did they go!!). The easy option was plugs and leads, which made a small difference, but the miss was still there, so I replaced my (motronic) coil packs with Britpart ones (I know I know). That sorted it good and proper!

    Fast forward, Cape York in there somewhere, a few local trips, then we went up to the Daintree! Lovely drive through the Bloomfield a few times and on the way home I took water through my snorkel and soaked the air filter (it was monsoonal rain). Dried the air filter and continued home, albeit a bit down on power. I feared that I'd damaged a valve or something during the water event, although I'd hoped not, so I went hunting again. The transmission was not behaving as usual either, which I didn't like.. The first call was to look at the plugs. Although only 6 months old, they looked ok. I tried replacing the leads again, no change. I had fears that the high quality Britpart coils may have lived up to their reputation, but the pig of a job changing them due to all the LPG gear covering my manifold put me off doing them, so I turned to the nanocom. No misfires showing thank god, so I put the coils down as ok.

    After thinking about it a fair bit, keeping in mind the transmission was not behaving as usual, I though perhaps the throttle position sensor may be damaged, but I didn't want to rip it off just yet, and not wanting to open the motor up the next logical step was to clean the MAF. A tin of MAF cleaner in hand, I removed it and gave it a good hit with half a can (then I sprayed it ;-) ). Bingo! Issue sorted! Back to rocket ship mode and the transmission was doing as it should again.

    And that's my little story! Perhaps it'll help someone else out if ever chasing an issue where the motor feels sluggish, and fuel consumption high. I went from 15L/100km on 95petrol (and 20L/100km LPG) up to 19L Petrol (23L LPG), and it felt like maintaining 110-120km/h was a chore.

    Cheers
    Keithy

    Green 2000 P38 Range Rover HSE - Gone
    Blue 1999 P38 Range Rover HSE - Gone

    Silver 2002 P38 Range Rover HSE - Sequential LPG, BCDC Charger, TPMS, Rear Locker, Wheel Carrier, Bullbar & Spotlights, General Grabber AT2's, Too Much to Mention!

  2. #2
    Join Date
    Jan 1970
    Location
    St Helena,Melbourne
    Posts
    10,744
    Gotta love simple ( cheap ) fixes.
    MY08 TDV6 SE D3
    98 TDI AUTO SE DISCO - 3" toughdogs, koni's, M8000 and bar, 265 MT's and still adding !
    2003 Dingo offroad camper trailer
    1998 Triumph Daytona T595
    1974 VW Kombi bus
    1958 Holden FC special sedan

  3. #3
    Join Date
    Jan 2016
    Location
    Netherlands
    Posts
    117
    Just goes to show that even our complex beast sometimes just need a bit of TLC I never would've thought of the MAF tbh since I never had one fail on a car I owned. The only exception beeing a leased VW golf IV diesel (crappy company car)

    Thanks for sharing!

    -P

  4. #4
    Join Date
    Feb 2013
    Location
    Gosford, NSW, Australia
    Posts
    2,398
    Good work Mate

    I treat the MAF as a service item to be cleaned at least once a year

    Steve
    MY96 4.6 HSE P38. Niagara Grey; "The Phoenix"
    MY99 4.6 HSE P38. LPG, Blenheim Sliver; "Voldemort" burnt to a cinder
    MY79 RR Classic, Gone, MY57 Series 1 SWB, Long gone
    P38 write ups and info on my website http://p38.hts.com.au/

  5. #5
    Join Date
    Aug 2010
    Location
    Pakenham
    Posts
    578
    Nothing worse than a dirty MAF!

  6. #6
    Join Date
    Apr 2010
    Location
    Lower Hunter Valley NSW
    Posts
    311
    As soon as I started reading this, the MAF was my first thought. Well done
    Current: MY99 Range Rover HSE with 5.0L V8
    Past: MY01 Discovery V8 - drowned , MY03 Discovery HSE V8 - sold

  7. #7
    Join Date
    Jan 2016
    Location
    Netherlands
    Posts
    117
    Since we're on the subject of the MAF, is there anything we can do to prevent it from getting dirty? I myself do plan to install an oil catch can for my PVC to keep my air intake (and engine) clean.

    Love nature, but I hate all that environmental stuff choking my engine

    -P

  8. #8
    Join Date
    Jan 2012
    Location
    Bendigo
    Posts
    1,617
    I have to admit cleaning the maf for the first time the other day, and got an extra 40km out of a task of lpg, and a bit more squirt too.

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