I have a 1988 OMC 4.3 (Model 434APRGDP, also a second sticker with model 985269??). with a 4bbl Rochester Quadrajet. It starts and idles great, but won't go over 2000 RPM. It starts up and idles fine up to about 1800 RPM. Will get to wide open for maybe 5 seconds when cold though, then sputters out, back to 1800.
For this so far, previous owner:
* replaced fuel lines (tank and engine)
* carb cleaned
I ran sea foam thru for about a tank full at the slow speeds and it seemed to get a tiny bit better. I wanted to use it more this weekend so I:
* had carb cleaned (but not rebuilt yet)
* replaced corroded anti siphon valve
* replaced fuel pick-up hose
* replaced fuel/water separator filter
* replaced fuel pump (mechanical)
Still bogged down at 2000. I checked tank vent hose and it had gas in it (I think from overfilling it on my first time i put in new gas). Some have suggested couple be related to an ESA issue (it actually had trouble shifting into forward so I replaced ESA as well). I am at a loss now. Other than checking for a vacuum leak(s) and rebuilding the carb, not sure what to do/look for. Anything obvious (or not) I could be (am) missing. Thanks.
John
For this so far, previous owner:
* replaced fuel lines (tank and engine)
* carb cleaned
I ran sea foam thru for about a tank full at the slow speeds and it seemed to get a tiny bit better. I wanted to use it more this weekend so I:
* had carb cleaned (but not rebuilt yet)
* replaced corroded anti siphon valve
* replaced fuel pick-up hose
* replaced fuel/water separator filter
* replaced fuel pump (mechanical)
Still bogged down at 2000. I checked tank vent hose and it had gas in it (I think from overfilling it on my first time i put in new gas). Some have suggested couple be related to an ESA issue (it actually had trouble shifting into forward so I replaced ESA as well). I am at a loss now. Other than checking for a vacuum leak(s) and rebuilding the carb, not sure what to do/look for. Anything obvious (or not) I could be (am) missing. Thanks.
John