5.7 Gi Volvo intermittent prob.'s

[snyyyper]

I have a '94 volvo penta 5.7 Gi (throttle body injected) engine that is giving me some problems. it starts and runs fine most of the time, but sometimes when I start it, it has a miss and won't accelerate up to plane, it just bogs and smoke starts coming out of the water behind the boat like it's flooded. but if I back off of the throttle and let it idle for a minute or so the miss goes away and it will run fine until I kill it and restart it later. engine has 220 hours on it, replaced fuel filter, checked anti-siphon valve (seems to be free). not sure where to go next. does the computer on this motor store trouble codes so that if I take it in to the shop and it won't act up, they can still tell what the problem was in the past?<br /><br />Thanks,<br />Scott

 

[Don S]

Re: 5.7 Gi Volvo intermittent prob.'s

Before you take it in, do a tuneup. Cap, rotor, spark plugs, check the plug wires, etc.<br />This cures many engines with running problems like that. Also check the electrical connectors on the engine, loose, corroded connections are an EFI marine engines worst problem.<br />The ECM does store trouble codes, but only on certain items. And usually all they tell you is what the problem isn't more than what the problem is.

 

[bigbrownbuku]

Re: 5.7 Gi Volvo intermittent prob.'s

most engine grounds sit directly beneath the hatch edge and get soaked, being in a hard to get location on the back of the block they are neglected. include a thermostat in your service.

 

[snyyyper]

Re: 5.7 Gi Volvo intermittent prob.'s

Thanks for the advice, guys. I will check all my electrical connections when I get to the lake Saturday (boat is in storage). One thing I forgot to mention is the tach is jumping around from time to time which backs up the connection theory. One other thing, if I had an injector leaking down into the throttle body, would that also cause it to run rough for 30 seconds or so after starting?