1990 351 Bogs at 2800 rpm

[hairlesshacker]

Originally Posted by j.mccreight@hotmail.com

However the test was not done properly, you need to do it at 80-100 psi regulated for accurate measurements and results.

yeah, I should have read the online reviews for this meter before I bought it.. apparently there's a good hack for it if you replace the second guage, which I might look into doing.. As it is, the PSI only get to 15-20 before the second meter's at the "0" mark. Much higher than that pegs the second meter, which measures "percentage of leak" rather than PSI..

http://www.harborfreight.com/cylinde...ter-94190.html

I probably just should have gotten a compression gauge for now, and not bothered with this. At the low PSI, the air didn't make much noise for telling where it was going... so I tried to hook the compressor directly to the hose at 80 psi, but my little compressor can barely keep up, and is too loud to hear over...

[hairlesshacker]

Just wanted to post an update.. Finally got the boat out on the water this past weekend, and the problem has been resolved. No problem pulling a skier, plenty of power, no engine bog.

This is the first time I've had it out since replacing the fuel pump. And I also replaced the Coil.

I really don't know which made the difference, and I guess I don't care enough at this point to switch parts back to see...

It's still a little hard to start, although it will start every time if I floor it prior to cranking to give it that extra squirt of gas. I never really finished adjusting the carb after renewing it, so I'm assuming once I get that all adjusted I'll be good to go.

Thanks everyone for all your comments and suggestions.

[thatsmrmastercraft]

Originally Posted by hairlesshacker

Just wanted to post an update.. Finally got the boat out on the water this past weekend, and the problem has been resolved. No problem pulling a skier, plenty of power, no engine bog.

This is the first time I've had it out since replacing the fuel pump. And I also replaced the Coil.

I really don't know which made the difference, and I guess I don't care enough at this point to switch parts back to see...

It's still a little hard to start, although it will start every time if I floor it prior to cranking to give it that extra squirt of gas. I never really finished adjusting the carb after renewing it, so I'm assuming once I get that all adjusted I'll be good to go.

Thanks everyone for all your comments and suggestions.

Great to hear

[Philscbx]

If you have a link to the leak down tester used - Id like to see - Thanks.
Like Jim stated - 80 psi is the norm. But these tools tell the whole story in one test which is nice.

As for a standard compression tool - it's not much help - several steps are needed for each cyl.
About as helpful as thumb over spark plug hole - gives enough info.
Typical engine needs 90 psi to fire off.

Great that he's up & Running.

[hairlesshacker]

Link to the leak-down tester is in prior post.. http://www.harborfreight.com/cylinde...ter-94190.html

There's notes in the comments/reviews about it's problem. Rather than the second guage measuring PSI, it measures "percentage loss", so you have to start with it reading 100.. well, 15 psi reads 100, and anything higher pegs the meter. Others have fixed it by replacing this "reverse" meter with a normal 0-100 psi guage, so it functions like a normal leak-down tester and can operate at higher psi.

[Playing hookie Prostar 190]

check the spark plug wires routing/ firing order . if two wires are crossed it will run that way.

[Philscbx]

Originally Posted by Playing hookie Prostar 190

check the spark plug wires routing/ firing order . if two wires are crossed it will run that way.

Not really - as it's running pull a wire to see if power is the same or drops - if no change it's crossed.
In effect - two dead cylinders.