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Old 06-20-2017, 04:47 PM
itsmetibbs itsmetibbs is offline
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Boat: 1995 Mastercraft Prostar
Location: Intermountain West
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1995 Prostar with Indmar 5.7L Engine Bogs Down After 20 min

First time Mastercraft owner here. I bought the boat from a gentleman who replaced a cracked block and never got it running right afterword. I bought it and found out he incorrectly installed the timing chain.. The chain was one link off causing all sorts of issues with the valves. I fixed the timing chain and reset my ignition timing and took it out this weekend. It was amazing.

This is my first time driving a direct drive boat, and my first time with a V8. I was amazed at the power and responsiveness. Regretfully, it only ran well for a short time. After about 20 minutes of towing tubers around, we killed the engine to switch riders. When I went to start it again, it wouldn't start. I pulled the cover and saw that we were getting fuel through the Electronic Fuel Injectors. We cranked on it for a bit, and waited, then cranked again, and waited, then cranked again.

After 5 minutes of intermittent waiting and cranking, I was just about to try and flag someone down for a tow when it started up. We kept the guys out on the tube, and started to tow them into the marina, but while towing them in, the engine wouldn’t rev above 2500 RPMs, but it sounded like the engine was running just fine, it simply lacked power.

I made a video trying to replicate the issues without any luck, but thought I'd post the video of it running normally at 3500 RPMs to see if anyone spotted anything.

https://youtu.be/h80EUg9i5UE

A friend of mine said he’s thinking it’s a fuel issue caused by the fuel pump. Any thoughts here?
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Old 06-22-2017, 06:01 PM
Cumminscj Cumminscj is offline
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If you could see fuel spraying while trying to start then it is unlikely that the fuel pump is the cause of the no start. A clogged inlet screen on the pump tends to cause a lack of power like you are having, but not usually a complete no start. For the no start look at the spark side of things and evaluate. Could be a few things including the ignition module/pickup module or even just the coil getting old and weak. I had a coil on one that would arc to the manifold anytime the humidity got too high. So once you raised the hatch it would almost always restart and it drove me nuts looking for the issue. You can also try checking the timing. If the pickup coil is failing then you will likely get some weird results.
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Old 06-29-2017, 11:13 AM
itsmetibbs itsmetibbs is offline
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Quick update. One mechanic suggested that my problem might be due to the fact that I have an exhaust leak. That leak may be filling up the dog house, and not allowing the engine to breathe. I'm going to lake test it without the doghouse on while I wait for the new fuel pump and filter to arrive.

@cumminscj, I do see fuel spraying when trying to start, the inlet screen appears to be clear. I agree, it's not likely a fuel pump, but I thought it'd be nice to have an extra anyway. Regarding spark, I'll look into it. I know my timing is okay at least initially, I'm not sure what timing looks like when the engine is struggling.
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Old 06-29-2017, 12:41 PM
bochnak bochnak is offline
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Boat: 94' Prostar 205 - Indmar 5.7 TBI
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Have you checked for any codes?
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Old 06-29-2017, 12:57 PM
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TimothyEllis TimothyEllis is offline
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I would pull a few plugs and check they are not fouled /wet
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Old 06-29-2017, 01:49 PM
itsmetibbs itsmetibbs is offline
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Quote:
Originally Posted by bochnak View Post
Have you checked for any codes?
I was under the impression code readers were expensive for the indmar engine. Is that incorrect? Would it be possible to get a reader on loan from Napa or something?
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Old 06-30-2017, 08:51 AM
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gr82bgreen gr82bgreen is offline
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I had the same no start concern with a 1995, 200 Vrs. (Same engine). It ran great, but if I shut it down I would have to wait until it cooled down to restart. I had fuel at the injectors. It would just crank but not fire. I fixed it by replacing the 160 thermostat with a 143. I never had the bogging concern though.
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Old 06-30-2017, 10:53 AM
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mikeg205 mikeg205 is offline
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Quote:
Originally Posted by itsmetibbs View Post
I was under the impression code readers were expensive for the indmar engine. Is that incorrect? Would it be possible to get a reader on loan from Napa or something?
up unit MEFI 4 you can make a reader for a few bucks or get one for $50 at michigan motors
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Old 06-30-2017, 10:53 AM
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mikeg205 mikeg205 is offline
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Quote:
Originally Posted by gr82bgreen View Post
I had the same no start concern with a 1995, 200 Vrs. (Same engine). It ran great, but if I shut it down I would have to wait until it cooled down to restart. I had fuel at the injectors. It would just crank but not fire. I fixed it by replacing the 160 thermostat with a 143. I never had the bogging concern though.
I had the same issue - no bogging - just hard start after heat soak
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Old 06-30-2017, 11:10 AM
bochnak bochnak is offline
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Quote:
Originally Posted by itsmetibbs View Post
I was under the impression code readers were expensive for the indmar engine. Is that incorrect? Would it be possible to get a reader on loan from Napa or something?
All you need is the proper LED and paperclip. Here are some instructions:

https://docs.google.com/document/d/1...it?usp=sharing
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