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  1. M

    5.7 EFI stalls when warm and shifting into gear

    Ok, MEFI 1 software. When you test those hoses, plug one and use the other for testing. Should be a constant flow of air. Plastic bag shouldn’t flutter. No published numbers on inner transom cable that I’m aware of. It’s more of a “feel” thing. That you still have a staked brass barrel tells...
  2. M

    5.7 EFI stalls when warm and shifting into gear

    Yes, the bolt holes say MEFI 2 case. Are you sure it’s a MEFI 1 program in it? Do you need to manually advance the throttle when you put it in service mode? The 0 IAC count kind of surprises me. But I’m one of those techs that didn’t work on many of the TBIs. When I did do diagnostic on them, a...
  3. M

    Boat not take off when everyone sitting in the back

    https://www.volvopenta.com/en-us/service-and-support/your-engine/manuals-and-handbooks/ This is the website that you can download a free owners manual. Please read the owners manual, pay attention to the section on loading your boat. Also read the section about static water line measurement. You...
  4. M

    Steering issue

    Yes this is rare, but I’ve seen a lot of stuff tie strapped to steering, throttle and shift cables. Never do that those 3 cables need to be able to move small amounts.
  5. M

    Steering issue

    Long shot, but the outer sheath of the steering cable must be free to move about 1” port and starboard where it connects to the rack. Have you tie wrapped anything to the cable or jammed a cooler or something else back by where the cable makes it’s bend to attach to the rack?
  6. M

    5.7 EFI stalls when warm and shifting into gear

    Hi, I haven't forgot you, but I've been very busy and don't have much time to devote to this. I've been looking for reasons why your engine is commanding zero counts to the IAC, (other then a vacuum leak) and have some questions. 1996 1/2 had a few changes and I need to narrow down what you...
  7. M

    5.7 EFI stalls when warm and shifting into gear

    Something to keep in mind with this system, there is a lot that the ECM doesn’t know. Fuel pressure is the biggest. With symptoms like you’re having with this engine, one of the first things to check is fuel pressure. Fuel pressure can and will only affect just at certain RPMs. Next is IAC...
  8. M

    FWC V8-300-C-A

    Once the antifreeze pressure reaches 15psi it will start spewing out around the cap. Cap is pressure sensitive. Or you’ll find a hose that wasn’t tightened up enough and it will blow off. None of this will be good and could be dangerous.
  9. M

    FWC V8-300-C-A

    If you do that, you should get antifreeze in the bilge. Antifreeze expands when heated. That’s why the reservoir is marked full hot and cold. Don’t fill it above the cold mark when engine is cold.
  10. M

    Engine Swap Over - First Oil Selection

    Volvo wants mineral oil for the complete break-in. No synth for 20 hrs
  11. M

    ECU pinout/wiring diagrams ???

    Volvo tech support can decode those ECM #s. "The ECM monitors the amount of voltage coming from the tachometer and sets DTC 2618 (or 2619) if the voltage is outside the set parameters" That's kind of a typo in the manual. It isn't there in later manuals. It doesn't really monitor voltage...
  12. M

    FWC V8-300-C-A

    Yup, but keep an eye on the level.
  13. M

    Catastrophic Engine Electronic Failure?!? Diagnosis Help!

    https://www.rinda.com/rindashop/ Suggest Diacom for your shop. If you want to charge customers to repair EFI sterndrives ----- you NEED this. The service manual that explains operation and troubleshooting can be found at...
  14. M

    Verado Power Steering Problem w. Video

    When this boat lost steering, it should have set one or more codes that would display at the helm. Those codes might help determine if this problem is simple or complex. But because of how complex these engines are, most likely you will need to have a Mercury dealer diagnose it. Here is my...
  15. M

    ECU pinout/wiring diagrams ???

    Do you have any wires connected to pins #25 and #26? Based on the screenshots you posted, these pins aren’t used in this application. I’m just guessing here about those pins. But that circuit is probably there to provide the option for cruise control. The last 2 screenshots deal with the tach...
  16. M

    2008 Chaparral 275 SSI 8.1 Volvo Penta GXI-J Soft Alarm Issues

    Having been a dealer tech for many years, I have to defend them some. Generally when you call a shop you don't talk to a tech, our time is to valuable to spend on random phone calls. You will get a service writer or at best the service manager. These people usually don't have a lot of technical...
  17. M

    2008 Chaparral 275 SSI 8.1 Volvo Penta GXI-J Soft Alarm Issues

    Just something that stood out. It's hard for me to look at the recordings without being in the boat to know water conditions and how the operator is using the boat. Also, sometimes people will post 2 recordings without telling us they changed something between them.
  18. M

    2008 Chaparral 275 SSI 8.1 Volvo Penta GXI-J Soft Alarm Issues

    Yes I see a vast improvement. If you look at the KS voltage they are now very close to each other. Before KS 2 was much lower than KS1. I’m pretty sure the soft warning was due to KS 2 voltage falling below 0.1 volts. This was latching and unlatching so fast it didn’t meet the requirements to...
  19. M

    2005 Chris Craft with 2 impellers overheating

    I worked for a Chris Craft dealer back then, That's a drop dead gorgeous boat. First year of them at the boat show, sales put one out on the point and everybody stopped and drooled. We sold every one we had on order. I was a twin engine boat tech so I didn't get to spend anytime in one until the...
  20. M

    2008 Chaparral 275 SSI 8.1 Volvo Penta GXI-J Soft Alarm Issues

    Thank you. I give you and @tpenfield (and of course the other mods) a lot of credit for the time you folks spend trying to help. I only hope no one takes offense when I chime in on things I think are wrong. Without people like you this forum would be filled with bad information.
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