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Thread: Getting atrocious mileage?

  1. #21
    Join Date
    Feb 2009
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    Quote Originally Posted by panamericano View Post
    Somehow I am not shocked that you think more clearly asleep than awake. That explains a lot.
    Let's face it, I don't need beauty sleep to be as ruggedly handsome as I am. So I have a lot of awake time to do productive thinking.
    Mike
    2010 Caterham CSR with Cosworth 2.3 Duratec
    2018 Caterham 420R with 2L Duratec 210hp at Donington UK
    1975 BMW CSL Group 4 (restoration - engine and dry sump install time)
    1977 Holden Torana "A9X" (awaiting restoration)
    1985 Holden Commodore Group A (restoration - engine rebuild)
    1982 Ferrari 400i (will repaint to original color in 2020)
    1965 Ford Mustang Fastback "Holman Moody"
    1992 Ford Escort RS Cosworth WRC (fettling after long period of storage)
    1990 Range Rover 2 door Classic

  2. #22
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    Nov 2010
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    NC
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    I have a few questions

    Are you running a o2 sensor and running closed loop at idle and part throttle ?

    Do you have a wideband air fuel gauge installed ? If so what is it reading ?

    Hands down the best plugs for the Zetec is Motorcraft SP463 gaped at .050

    Tom

  3. #23
    Join Date
    May 2018
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    Albany, NY
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    182

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    Firstly, thank you all for all your help so far.


    Quote Originally Posted by 1turbofocus View Post
    I have a few questions

    Are you running a o2 sensor and running closed loop at idle and part throttle ?

    Do you have a wideband air fuel gauge installed ? If so what is it reading ?

    Hands down the best plugs for the Zetec is Motorcraft SP463 gaped at .050

    Tom
    To answer a few questions and catch up on the thread.

    Nothing motor wise has been touched since I bought it and sorted out some of the cooling/oil dripping issues.

    Part of full disclosure while trying to test/get my radiator fan to kick on I very briefly might have hit the upper temp range a few times before shutting it off. Small chance of a blown head gasket? (yet to be tested but temperature is fine/lower now if anything. I put in a lower temp thermostat too).

    Performance wise over the last ~500 miles it has been pretty much consistent. Certainly peppy/fast but not certain if its running 100%. Certainly dont randomly break traction under throttle with the alleged ~200hp+ per original builder.


    I don't know how my O2 is running. i can only assume it does its regular open/closed loop procedure.

    No wideband installed. I have some kicking around from other projects so it might be a good idea to put that in.

    I'll do the new plugs as one of the first things in further troubleshooting/partitioning.

    Vacuum trick has gotten most of the crud out!
    2001 Caterham Superlight R

  4. #24
    Join Date
    Nov 2010
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    NC
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    Need to do a datalog and see what your front o2 sensor is doing , a bad o2 can cause bad MPG , running bad , etc

    Tom

  5. #25
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    Oct 2006
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    Cincinnati
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    I once reasoned that, since I did not have a catalytic converter, I could run leaded gas in my Zetec(:. That messed up the O2 sensors and performance went away. Maybe just replace the O2 sensors and see if that helps?
    '97 Caterham Super Sprint, 1700 Crossflow-sold
    '09 Birkin S3, Duratec-sold
    '03 Caterham Zetec track car

  6. #26
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    May 2013
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    South Bay, CA
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    That is indeed a lot of carbon. Do these engines run closed loop?

    Daniel

  7. #27
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    Nov 2010
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    NC
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    He said he had a o2 sensor if he does then its running closed loop , Car starts in open loop , times out to closed loop , the o2 controls the closed loop fueling at idle and part throttle then past a giver RPM or TPS depending on how he has it set up changes to open loop for WOT

    Tom

  8. #28
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    Are you sure the O2 is narrow band? The Pectel is pretty sophisticated so i'd be surprised if it doesn't use a wide band and have an interface that shows live AFR, or better yet, log it.

    -John
    Westfield SEiW
    2.0L Duratec
    Throttle Steer

  9. #29
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    Nov 2010
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    NC
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    Quote Originally Posted by JohnCh View Post
    Are you sure the O2 is narrow band? The Pectel is pretty sophisticated so i'd be surprised if it doesn't use a wide band and have an interface that shows live AFR, or better yet, log it.

    -John
    He might have the higher end pectel that uses the 5 wire wide band , he can look at the wideband and tell , 4 wire or 5 wire on the stock o2 sensor

    A log to see what the o2 is doing would be the first thing I would be doing

    Tom

  10. #30
    Join Date
    May 2018
    Location
    Albany, NY
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    Quick updates.

    Changed the plugs to recommended Motorcraft SP463 gaped at .050.

    Drove it highway 20 miles, went through 1.9 gallons.

    Drove back on secondary roads as another way to partition to see if its something to do with higher RPM/6spd gearing. Haven't had a chance to refill it but will post that data once I have it.



    Currently looking into all the Pectel Data logging software and profiles and ordering the cable to make it all work.

    Didn't have a chance to cross reference the o2 sensor but I looked this morning and it's a 4 wire OEM Ford.
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    2001 Caterham Superlight R

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