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Thread: 21 superboat slowed down
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07-11-2020, 10:30 PM #16Junior Member
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Im going to have the coils checked out Monday/Tuesday, i hope it is a simple fix.
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07-11-2020, 10:35 PM #17
You can do a drop cylinder test, but even that doesn't always show up. If you know of another good running 250, swap the coils. It will take 10-15 minutes
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07-12-2020, 01:37 PM #185000 RPM
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Buy one new coil and swap it from cylinder to cylinder. It will take you less then an hour to try it at all locations.
Cheapest and easiest solution.
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Li'l Toy liked this post
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07-14-2020, 11:44 PM #19
So I got up to take a leak a lil bit ago . I figgert I turn the light on so I didn't bizz all over the floor before I heard water splashing .
Same principle applies here … hope and poke might hit it the first time , or add to the frustration level …
500+ hours and 16 years young , ain't exactly fresh , but still my favorite piece to start with ..
How much fuel pressure does it have ? It has a shrader valve , use a tire gauge .
Under 40 psi and it prob needs a kit in the pulse pump .. A bad one will cause the hi-pres pump to cavitate , over 45 and the little screen under the regulator is clogged .
Are all the plugs black as my bathroom with the lights off .. ?
Load test the battery . ? Dead cell . ? Alternator putting out 14.5 volts @ 50 amps .?
Is one plug black ? The rest cinnamon .. strike that .. the rest look like they are firing ?
Before you insist it's a CDM (coil) .. test them . One black plug could be a CDM . The Motorola is a high dwell spark .. so it could even be the guy before the black plug ..
Easy to test … Left to Right A B C D E .. >
All three temp sensors are the same .. temp on left / ohms on right .. check at ambient temp and either heat or put an ice cube on the heads / plenum, if it moves , it's good ...
crank trigger eye usually is either good or bad , but check it anyway .
Make sure the TPS makes the full sweep within spec ...
Check the MAP sensor and pull it our and shoot some brake clean in the little hole , shake it out .. maybe do it a couple times if oil is drippin out of it ..
Old azz plug wires .. ? I buy the spiral core 8mm house brand from Jegs . they even gotz em in your boat color ... I miss my 21' Superboat ..
FWIW .. I like NGK BR8HS plugs .. gapped to .028 - .030 Don't buy the -10 at the end .. they are gapped @ .040 / 1.0mm .. well .03937 .. way to much ..
Dayum~id .. now I gotta go bizz again ... <strike></strike><strike></strike><strike></strike>
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07-24-2020, 11:39 AM #20
Your hired!
Life Begins At 100 MPH
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vnemous liked this post
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07-24-2020, 12:27 PM #21Ahh , Dad , I think I bought the book from you …<strike></strike>
There are 949.36 miles from Toms River to Palm City in southwest direction and 1,148 miles (1,847.53 kilometers) by car, following the I-95 S route.Toms River and Palm City are 17 hours 48 mins far apart, if you drive non-stop
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It's a little too far to drive back and fourth every day .. think you could just send me my allowance every .. err ... twice a week ... <strike></strike>
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vnemous liked this post
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08-07-2020, 12:53 PM #22Junior Member
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Thank you for the input everyone, We figured out why she was going slow. It was a stretched throttle cable. Just replaced it now I am back in the low 70's with a full tank.
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HydroSkreamin, WavetoWave liked this post
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08-08-2020, 02:47 PM #235000 RPM
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Thanks for giving an update....That issue never crossed my mind.
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suerboatsuperboat liked this post
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