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  1. K

    5.7 EFI stalls when warm and shifting into gear

    What would cause a leak under the intake? The gaskets shifting during installation? How would I determine if there is a leak under the intake? I would hate to go through the trouble of tearing it down just to find nothing wrong. I did do the plastic bag trick Muc mentioned and it passed -...
  2. K

    5.7 EFI stalls when warm and shifting into gear

    I have sprayed carb. cleaner all around the intake to head joints, front and rear of the manifold, throttle body to intake and it does not affect the idle. Where else would a vacuum leak occur? I realy thought I found it when I discovered the bad bushing adapter on the MAP sensor but that was...
  3. K

    5.7 EFI stalls when warm and shifting into gear

    I am out of ideas on if and where the engine might be drawing in unmetered air. It is not at the intake to heads, throttle body to intake manifold or the MAP sensor. The IAC counts are still zero at idle once the engine warms up. I plan to check the bushings on the throttle plate shaft but...
  4. K

    5.7 EFI stalls when warm and shifting into gear

    When the RPMs begin to drop, the ECM is giving the engine additional fuel as the injector pulse width increases.
  5. K

    5.7 EFI stalls when warm and shifting into gear

    The base timing specification for my engine is 8° BTDC. The engine performs fine at cruising speed and any RPM above idle. I need to study the theory of operation section in the manual in order to determine what to look for next. Scrolling through the engine data, the water temp sensor...
  6. K

    5.7 EFI stalls when warm and shifting into gear

    There is an injector pulse width in the engine data parameters. I'll check it out this afternoon.
  7. K

    5.7 EFI stalls when warm and shifting into gear

    I tested the MAP sensor per the manual when I was investigating the code 33. I don't remember the exact voltage but it was very close to 5VDC. I have not tested the TPS yet.
  8. K

    5.7 EFI stalls when warm and shifting into gear

    The new adapter bushing arrived yesterday. I installed it and took the boat out to test it. I brought the MAP sensor from the Cadillac with me also. The vacuum leak was gone but the stalling when warm persisted so I swapped in the sensor from the Cadillac. There was no improvement - the...
  9. K

    5.7 EFI stalls when warm and shifting into gear

    It's been a long time but since I am the original poster, I wanted provide an update. The IAC counts are in the 40s when the engine is first started up and they gradually decrement to zero as the engine warm up. With the engine in gear at idle, the RPMs will go below 600 and the system will...
  10. K

    5.7 EFI stalls when warm and shifting into gear

    I attached the ground wires in the same order they were removed when I pulled the old engine and I didn't notice any corrosion on the studs or terminals. The engine runs fine most of the time. It seems like when it is just in gear and running around 600-625 RPM it will occasionally stall out...
  11. K

    5.7 EFI stalls when warm and shifting into gear

    I tested the fuel pressure - the spec. was 30 psi and it held steady at 32 psi even when the engine stalled.
  12. K

    5.7 EFI stalls when warm and shifting into gear

    I replaced the lower shift cable and the engine is no longer stalling when coming out of gear. Once the engine is warmed up, when I am in just in gear at 600-625 RPM, the engine will randomly stall. I replaced the IAC motor a couple of weeks ago and that did not solve the issue. What are the...
  13. K

    Lower shift cable kit question

    I am in the process of replacing the lower shift cable on an alpha one gen 2 drive. In the cable kit, part no. 8M0176525, there are two plastic cable conduits - one about 3/4" long and the other is about 3-1/2" long. I believe my application uses the shorter part and it installs from inside...
  14. K

    5.7 EFI stalls when warm and shifting into gear

    When I plug in the scan tool, it displays MEFI 1 detected. I need to manually advance the throttle while in service mode to check the timing. Depressing the shift interrupt switch will kill the engine. I will check the two hoses that connect to the flame arrester with a plastic bag per your...
  15. K

    5.7 EFI stalls when warm and shifting into gear

    I have the cool fuel system. The ECM is MEFI 1 in what looks like a MEFI 2 case.. The bolt to bolt dimension is 4-3/4". There is a label 9855 on the top edge of the ECM. I checked a friends boat that has the 5.7 TBI engine and his IAC count was also 0 at idle. One thing I did notice is his...
  16. K

    5.7 EFI stalls when warm and shifting into gear

    This is because it briefly returned to within 75 RPM of the initial speed after exiting the set timing mode? I am at a loss on who I can contact next. Most if not all places in my area won't work on anything older than 2000 model year and those that might have no experience with these engines...
  17. K

    5.7 EFI stalls when warm and shifting into gear

    I took a look at the IAC valve again and the pictures show it as I just removed it. It is very clean. I am hesitant to replace the IAC valve as I don't think it is the issue but do not know what is causing the stall condition. Page 5E-81 of the service manual #17 has an idle air control...
  18. K

    5.7 EFI stalls when warm and shifting into gear

    It stalled when I left the dock this afternoon - when I shifted from reverse to neutral prior to shifting to forward. It's never done that before - it usually waits until it is warmed up... Once it warmed up to temperature, I couldn't get it to stall for quite some time, then it started to...
  19. K

    5.7 EFI stalls when warm and shifting into gear

    Autozone's "GM TBI adapter" in their fuel pressure tester will not work with the Mercruiser lines. The end that threads into the throttle body has the wrong type of fitting. I would up using a different adapter from their kit, a length of 3/8" hose, a couple of short pieces of 3/8" brake line...
  20. K

    5.7 EFI stalls when warm and shifting into gear

    Thank you for the explanation of the IAC parameters. This is the same 24' Sea Ray and I have not been able to identify the cause of the failure which really bothers me. When I thought it was just a bad head gasket, I was going to have a machine shop resurface the valves, etc. They were...
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