1990dtgl98
Seaman
- Joined
- Jul 17, 2011
- Messages
- 57
Hey y'all.
Bought a 1999 sea ray that ran but stumbled and misfire. It also surged and wouldn't hold idle. Since I had some free time in the spring I was able to do some work. All new as of this spring:
-Siphoned old gas. The previous owner didn't run it last year and the gas was at least 2 years old, smelled like paint thinner and looked off in color. I siphoned all of it out completely. Replaced the anti siphon valve and fuel water separator.
-Fuel pressure regulator
-Fuel pump
-Spark plugs (gapped .045)
-Cap and rotor
-Ignition coil
-Impeller
Set the base timing to 8* at 1800rpms. Fuel pressure is 39ish psi at idle. Idles at around 700rpm, fires right up cold or hot.
Finally got the family out and it ran great. It has a slight vibration but it doesn't feel like a misfire (need to check alignment). Decided to do a quick WOT run to confirm all was well, and that didn't go so well. WOT I was only able to get 3400rpm and 34mph. I do have a captains choice exhaust so I switched it to through hull (straight pipe) and it made no difference, still about 3400rpm and 34mph.
Speed was checked via GPS. 2 adults, 2 kids, 30gal gas. 26p props on a bravo 3 drive.
I'm thinking it's not exhaust if there was no change. The last thing I changed was the fuel pump and regulator (old one only had 26psi at idle). I ran it before changing it (and checking pressure) and could only get 2000rpm and the whole time it was backfiring out the intake and exhaust.
Could it be I need to replace the plugs again? Perhaps their coated since the pressure was so low previously? Any other ideas? Not sure where to go from here....
Bought a 1999 sea ray that ran but stumbled and misfire. It also surged and wouldn't hold idle. Since I had some free time in the spring I was able to do some work. All new as of this spring:
-Siphoned old gas. The previous owner didn't run it last year and the gas was at least 2 years old, smelled like paint thinner and looked off in color. I siphoned all of it out completely. Replaced the anti siphon valve and fuel water separator.
-Fuel pressure regulator
-Fuel pump
-Spark plugs (gapped .045)
-Cap and rotor
-Ignition coil
-Impeller
Set the base timing to 8* at 1800rpms. Fuel pressure is 39ish psi at idle. Idles at around 700rpm, fires right up cold or hot.
Finally got the family out and it ran great. It has a slight vibration but it doesn't feel like a misfire (need to check alignment). Decided to do a quick WOT run to confirm all was well, and that didn't go so well. WOT I was only able to get 3400rpm and 34mph. I do have a captains choice exhaust so I switched it to through hull (straight pipe) and it made no difference, still about 3400rpm and 34mph.
Speed was checked via GPS. 2 adults, 2 kids, 30gal gas. 26p props on a bravo 3 drive.
I'm thinking it's not exhaust if there was no change. The last thing I changed was the fuel pump and regulator (old one only had 26psi at idle). I ran it before changing it (and checking pressure) and could only get 2000rpm and the whole time it was backfiring out the intake and exhaust.
Could it be I need to replace the plugs again? Perhaps their coated since the pressure was so low previously? Any other ideas? Not sure where to go from here....