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P8 ECU and idle trim screw info

Discussion in 'Loop & Tonti' started by GT-Rx®, Apr 28, 2012.

  1. GT-Rx®

    GT-Rx® Administrator Staff Member GT di Razza Pura

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    For those who need this info, Trim screw direction for lean/rich.

    P8-AF-Screw.jpg

    Actual P8 Manual Download below.
     

    Attached Files:

  2. kiwi dave

    kiwi dave GT Reference

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    Re: P8 idle trim screw info

    Never personally tweaked this adjustment, although I still have one Guzzi ('97 California Anniversary) that has the P8 computer.

    But I have been warned to use a screwdriver with an insulated shaft. Apparently, you can do some damage if you short the adjuster on to the side of the box. Can't verify this, but wish to pass the warning on.
     
  3. GT-Rx®

    GT-Rx® Administrator Staff Member GT di Razza Pura

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    Re: P8 idle trim screw info

    Dave, my buddy Claudio of LongWalk.it was here for the last few weeks, and he constantly tweaks this as fuel quality/pre-detonation demand. He uses the all metal screw driver from the OEM tool kit, so not saying that what you say is incorrect, but he's had no issues to date.
    Unrelated, I burned two new EPROMs for him to try and combat the poor fuel in South America... so I can now burn P8 EPROMs for anyone reading this/in need.
     
  4. kiwi dave

    kiwi dave GT Reference

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    Re: P8 idle trim screw info

    Yeah, that's why I mentioned that I can't verify it. In fact I don't want to verify it, so I would use the insulated screwdriver if I ever get in there.

    Perhaps your buddy Claudio has a real steady hand. Seems strange that he had to constantly tweaks, why would you have to keep chasing the setting?
     
  5. ian-jowsey

    ian-jowsey Just got it firing!

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    Thanks Dave

    This is excellent reference material, much appreciated. My California Stone is all over the workshop floor at the moment. I'll be tweaking the trim screw using a CO gas analyzer when its back in one piece. The system is the same as on many of the Fiat and Lancia vehicles I've worked on in the past. Its pretty simple once you get familiar with the components. My bike is a later version with the fuel filter inside the tank. Its easy to miss this when servicing the bike because you can't see it so I'd suggest anyone working on these replaces the filter first up. Its a tiny filter and you'll hear the relief valve in the pump actuating when the ignition is turned on if its restricted. Mine hadn't ever been changed in 10 years of use.

    Cheers

    Ian Jowsey
    Hobsonville NZ
     
  6. john zibell

    john zibell Moderator Staff Member GT di Razza Pura

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    Ian,

    Your bike doesn't use the P8 ECU. It uses the 15M. The "trim screw" can only be adjusted electronically with software on the 15M. Todd has an excellent sale on the software at this time. See the Store tab.
     
  7. ian-jowsey

    ian-jowsey Just got it firing!

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    Cheers John

    That explains why I couldn't find the adjuster when looking for it last night! The atmospheric pressure sensor looks different too but the rest of the components apart from the fuel pump and filter arrangement seem to be the same or similar.

    Regards Ian :idea:
     
  8. john zibell

    john zibell Moderator Staff Member GT di Razza Pura

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    With the 15M, the pressure sensor is internal to the ECU. Just forget everything mentioned for the P8 as it doesn't apply to your bike. The only useful information is the value of shared sensors. Even the TPS settings for the bikes are different.
     
  9. ARVENO

    ARVENO Cruisin' Guzzisti

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    I got it running .... was starving fuel .
    I cleaned the petcock and replaced few fuel lines and she started right away.... fuel pump still noisy , have to figure out why.
    thanks
     
  10. GT-Rx®

    GT-Rx® Administrator Staff Member GT di Razza Pura

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    Good to hear, and replace the pump. It's likely full of crud, and it's non-rebuildable. I have some alternates listed in the Archives (tab above).
     
  11. Drumnagorrach

    Drumnagorrach Tuned and Synch'ed

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    Interesting reading ,got me wondering about fuel filters and changing them . What's the general opinion on how long they go before needing changing . Manuals invariably quote service intervals for air filters but here in Scotland I have yet to come across an air filter that's choked ( too damp for dust )and I doubt that my 1100i Cali has had a fuel filter change in years ( owned by me for 1 year )
     
  12. john zibell

    john zibell Moderator Staff Member GT di Razza Pura

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    Where you have clean fuel, 40 to 45,000 miles should suffice. If in an area where fuel is not so clean, then perhaps 20,000 miles. It is not so much age, but how much fuel has been filtered and how good the fuel is.
     

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