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  #11  
Old 08-26-2018, 06:25 PM
lake weir skier lake weir skier is offline
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Boat: 1994 MasterCraft ProStar 190, 350 TBI, 1:1
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I just tested my MAP sensor with the key on and known vacuum levels applied to it with a Lisle 75000 hand vacuum pump. I'm especially confident in the vacuum readings on the pump's integrated gauge since I first tested it in parallel with my OTC vacuum gauge and my Winters +/- 1.5 percent accuracy vacuum gauge.

Gray wire: 5.0 volts

Black wire: 0.0 volts

Green wire (three trials):

0 inches of Hg: 4.9, 4.9, 4.9 volts

5 inches of Hg: 3.9, 3.8, 3.9 volts

10 inches of Hg: 3.0, 3.0, 3.0 volts

15 inches of Hg: 2.2, 2.2, 2.2 volts

20 inches of Hg: 1.3, 1.3, 1.3 volts

These voltages look very consistent and pretty much in line with what I see for GM 5.7 liter engine MAP sensors on auto diagnostic websites:

MAP Sensor Test (P0106, P0107, P0108) (GM 4.3L, 5.0L, 5.7L) (see Step 6)

Manifold Absolute Pressure MAP Sensors (see chart)
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Last edited by lake weir skier; 08-26-2018 at 06:46 PM.
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  #12  
Old 08-26-2018, 06:59 PM
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mikeg205 mikeg205 is offline
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The one variable not mentioned is occupant and driver mass

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  #13  
Old 08-27-2018, 02:09 AM
lake weir skier lake weir skier is offline
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Originally Posted by mikeg205 View Post
The one variable not mentioned is occupant and driver mass

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Unfortunately, I weighed the same 220 pounds in 2015 and 2018. I'm not allowed to know my girlfriend's weight, but I think it too was about the same in 2015 and 2018.

I didn't record cloud conditions.
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  #14  
Old 08-27-2018, 03:33 AM
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bret bret is offline
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Same Prop? When you changed the fuel pump, as you swapped the lower fittings, did you check the very fine screen in the bottom fitting for any "fuzz or wadding"? Just curious if logged the temperature of 2015/2018, was 15 cooler?

Did you try the run at 10 timing? Do you use and valve cleaner or fuel treatment? Having a history with Porsche, I'm a fan of Chevron Techron for keeping intake valves clean and fuel system in pretty good shape for track cars. I use in the boat as well, I change the oil after the tank of fuel with Techron is depleted.
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Old 08-27-2018, 06:36 AM
lake weir skier lake weir skier is offline
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Originally Posted by bret View Post
Same Prop? When you changed the fuel pump, as you swapped the lower fittings, did you check the very fine screen in the bottom fitting for any "fuzz or wadding"? Just curious if logged the temperature of 2015/2018, was 15 cooler?

Did you try the run at 10 timing? Do you use and valve cleaner or fuel treatment? Having a history with Porsche, I'm a fan of Chevron Techron for keeping intake valves clean and fuel system in pretty good shape for track cars. I use in the boat as well, I change the oil after the tank of fuel with Techron is depleted.
Yes, same Acme 541 prop.

I've checked the screen in the past and found nothing in it. Can't recall for sure but I probably checked it again when I changed the pumps. I'm going to check the fuel pressure and fuel shut off valve. Will take a look at that screen too, but I'm betting it's okay because I cleaned out the fuel tank very well around 2014.

Don't know if the 2015 and 2018 temps differ.

I have never altered the timing from the 12 degrees I found when I first checked it.

I have not used any fuel additive but thought recently about giving one a try and investigated SeaFoam.

EDIT: First thought you were asking about engine temp, but if you are asking about ambient temp, I didn't record it, but the measurements were in Sept 2015 and August 2018. Chances are here in North Central Florida the 2015 and 2018 ambient temps were close.
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Last edited by lake weir skier; 08-28-2018 at 11:56 AM. Reason: Clarification
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  #16  
Old 08-27-2018, 10:36 AM
88 PS190 88 PS190 is online now
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I think the only conclusion is that nothing is wrong with your boat... Seems to go appropriate speeds and behave appropriately for the vintage of hull/application. I'll let you know my full throttle 1994 TBI 350 1:1's RPM this weekend.
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  #17  
Old 08-27-2018, 12:43 PM
lake weir skier lake weir skier is offline
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Originally Posted by 88 PS190 View Post
I think the only conclusion is that nothing is wrong with your boat... Seems to go appropriate speeds and behave appropriately for the vintage of hull/application. I'll let you know my full throttle 1994 TBI 350 1:1's RPM this weekend.
It's lost 250 RPM at WOT in around 50 hours of use with a bit over 500 hours on it. That's normal?
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  #18  
Old 08-27-2018, 08:06 PM
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Lake... time to get the software to read what is happening with your motor. I know I get better performance when weather is cooler. I see a drop in RPM when weather is in the 90s and water in the 80s. Try some different props.. maybe one of the inputs to ECU sending a change in data.. the rhinda soft was are will cure your curiosity...

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  #19  
Old 08-28-2018, 05:24 AM
lake weir skier lake weir skier is offline
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Boat: 1994 MasterCraft ProStar 190, 350 TBI, 1:1
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Quote:
Originally Posted by mikeg205 View Post
Lake... time to get the software to read what is happening with your motor. I know I get better performance when weather is cooler. I see a drop in RPM when weather is in the 90s and water in the 80s. Try some different props.. maybe one of the inputs to ECU sending a change in data.. the rhinda soft was are will cure your curiosity...

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I know I've seen JimN suggest using diagnostic software and possibly members sharing to split cost. I looked into some around when this thread was started in 2015. If I recall correctly, a concern I had was my boat has MEFI 1, which yields quite a bit less info than later versions. I'll consider it.

I'm going to check my fuel delivery next, and I may look again at those ignition changes you made. I'm also going to re-run the leak down on the left bank and pay more attention to where leaking is observed. Focused on No. 7 initially.

September of 2015 and August of 2018, when I tested, probably close in temperature here in North Central Florida.
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  #20  
Old 08-28-2018, 05:42 AM
lake weir skier lake weir skier is offline
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I will say as far as what is normal for something old like my boat, I am responsible for a centenarian. About eight months ago, I expressed concern to her primary care physician about her anemia. Her hemoglobin had dropped from 11 ish to 8 ish since 2011. The reference range for an adult female is 12.0-15.0.

The primary care physician wrote it off as age related. Didn't want to do anything. Then I got a hematologist involved six months ago. She's been treated a couple of times and has had a dramatic, months long response both times. In late July, her hemoglobin hit it's high point of 15.7 (actually above normal). The lab tested twice they were so surprised. Last week, she was at 14.8. Similar response in increasing her red blood cell count and hematocrit to normal levels.

She's got the best blood she's probably had in decades. She does exercise in her facility people twenty years younger wish they could do.

So, yeah, sometimes it pays to look for better ways.
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Last edited by lake weir skier; 08-28-2018 at 11:58 AM.
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