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Thread: Bosch CIS fuel pressure gauge

  1. #51
    '82 T3 FABombjoy's Avatar
    Join Date:  May 2011

    Location:  Lansing, MI

    Posts:    768

    My VIN:    10270

    Quote Originally Posted by Trstno1 View Post
    - I still do have a bit of a cold start issue where the car wants to crank 4-7 seconds before firing up, then it will hunt pretty good for the next minute until it warms up and settles at 775 RPM.
    Just to be sure - is this behavior consistent now? Whenever I've opened up my fuel system or the car has sat for a long time it always takes a bit longer for the first start. After you changed injectors I wouldn't be surprised to see a delayed startup on your first try, but the next day have a much quicker cold start.
    Luke S :: 10270 :: 82 Grey 5-Speed :: Single Watercooled T3 .60/.48 :: Borla Exhaust :: MSD Ignition :: MS3X Fully SFI Odd-fire EFI :: DevilsOwn Methanol Injection - Game console parts, kits, games and more. [shop] [wiki] [RSS] [f] [t]

  2. #52
    Senior Member DMCVegas's Avatar
    Join Date:  Oct 2011

    Location:  Las Vegas

    Posts:    2,434

    My VIN:    6585

    Club(s):   (DOA) (DCUK)

    In the Owner's Manual, the instructions clearly states that when cranking, you want to hold the Accelerator Pedal down of the way. Now, people have argued with me for years that's incorrect, because it *probably* was just copy/pasted from a carbureted PRV manual.

    BUT take a look at this: Volvo in their Owner's Manual has instructions that state: If the engine does not start at once, depress the throttle pedal half way and keep it there until the engine starts.

    The fuel system diagram doesn't *look* like the CSV should be affected by the throttle plate, but holding down the throttle pedal would eat least allow the upper and lower chambers of the Fuel Distributor to fill more quickly as the plate is then depressed from the inbound air, and the plunger slides open.

    I've always noticed I've had longer cranks when starting the engine when leaving the pedal alone. EFI Injectors not only run at lower pressures, but also are designed to flow enough additional fuel during cold starts that an additional injector isn't needed. That's why you needn't press the pedal when cranking a modern car. But if even Volvo is telling owners to hold the pedal down during cranking, it absolutely affects starting.

    Wake me when hockey season returns...

  3. #53
    Senior Member Morpheus's Avatar
    Join Date:  May 2011

    Location:  Orlando, FL

    Posts:    1,181

    My VIN:    Former owner of 1098

    Club(s):   (DCF)

    Tons of useful info in this thread. I have my own WUR issues to troubleshoot, but I will start with cleaning it first and see where that gets me.
    Brandon S.

    2014 Honda Civic EX
    2007 Volvo S60R

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