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  #1  
Old 05-29-2015, 09:54 PM
ericb352 ericb352 is offline
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Join Date: Apr 2015
Boat: prostar
Location: florida
Posts: 4
Help! prostar 205 lt1 missing after warm up

This is only my second post and these forums have been invaluable for parts and troubleshooting so THANK YOU. I purched a boat from the classified forum that had not beenvstarted in two years. Have so far replaced alternator, fuel pump, drained tank, new fuel filter etc. Boat runs great untill it warms up. Like after 30 or more minutes of driving. Then at around 2500 rpms it starts missing and wont get over it. 40 psi of fuel pressure at all rpm ranges so startin tovthink it is spark/coil related. Any help where to go from here would be appreciated.
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  #2  
Old 05-31-2015, 05:14 AM
Ben205 Ben205 is offline
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Join Date: Apr 2015
Boat: 1995 MasterCraft ProStar 205
Location: south
Posts: 32
Check for vacum leak.

Check and replace PCV valve.

Check the plugs. See if any look different. There is a link
http://mazda626.net/topic/41604-spar...pection-guide/

Change plugs and wire if you haven't done that already

Next would be a compression check. All should be 180psi

Remove and clean coil pack. I have heard some times these packs can get quite dirty.

Check Ground connections to motor.

Next is Fuel inject clean. Link below
http://www.mastercraft.com/teamtalk/...light=injector

Clean the throttle body. Take the cover off and use spray cleaner.

Hopefully one of these will point you in the right direction.

Tell us your finding.
Regards
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  #3  
Old 05-31-2015, 08:19 AM
Fullpass Fullpass is offline
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Boat: MasterCraft 197 Pro Tournament Team
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READ THIS

IF THE BOAT RUNS AT ANY RPM THEN SHUTS DOWN CHECK ENGINE WATER GAUGE TEMP

What does the engine water temperature gauge read when the boat begins to misfire? Gauge should be near 160 degrees, if getting warmer near 190/200 degrees...the boat has a protection circuit built into its computer to limit rpms to help prevent overheat...boat will still idle, run smooth, but will not go over a certain rpm...boat probably won't be able to get up on plain. Two things to look for...remove impeller cover, look for sheared impeller, second even if impeller looks good, the mechanic may have not cleared sheared impeller rubber particles from the inline transmission water cooler, this will cause restricted water flow to the engine, hence higher temps indicated on gauges, circuit to go into protection mode and limit the rpms...can find the trans oil cool by following the water lines...sometimes a minor pain to get at, but well worth it, could even be seaweed plugging it up. If you need to remove the impeller, spray a liberal amount of WD40 on the impeller, should be able to remove with some needle nose vise grips, note the direction of impeller vain to reinstall. Transmission cooler has a bunch of pencil size water passages, usually plugged on the inlet side, can remove the radiator clamps on each end to remove and clean.
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  #4  
Old 05-31-2015, 12:16 PM
Ben205 Ben205 is offline
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Join Date: Apr 2015
Boat: 1995 MasterCraft ProStar 205
Location: south
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Yes limp mode.
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  #5  
Old 05-31-2015, 12:19 PM
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mikeg205 mikeg205 is online now
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Boat: 1995 Pro Star 205 5.7 Liter
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check the coil pack - you may have corrosion or even cracked coil packs.. this has been a common problem.. a bunch of threads here on this.

mike
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...A bad day water skiing still beats a good day at work...1995 Pro Star 205....
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Old 06-01-2015, 03:05 PM
ericb352 ericb352 is offline
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Boat: prostar
Location: florida
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Plugs, wires, and pcv valve order from skidim. Will do compression check and have injecters cleaned. Also going to clean coil packs. Will post update.
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Old 06-08-2015, 11:09 PM
ericb352 ericb352 is offline
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Join Date: Apr 2015
Boat: prostar
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Update. Took the boat out last Saturday and the miss went away but the chek engine light came on. Code 43 which i believe is the knock sensor.
Plugs, wires, thermostats, oil replaced. Injectors cleaned. Compression check good.
Two questions. First where is the pcv valve located cuz iv can't find it. Two how do I troubleshoot the knock sensor? Looks like one wire. Is it common for them tovgo bad and can i just get one from an auto parts store? Thanks in advance.

Last edited by ericb352; 06-09-2015 at 12:43 AM.
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