1994 5.8l Fi Volvo hard to get started after warmed up

[RodeoTrent]

I have a 1994 210 Horizon, when its cold it starts up on the first crank. After running and getting warmed up, once i stop to swim or what not, if i let it sit more than a few seconds it will crank for about 10 seconds before finally starting up. and in this case if i go to take off right after (some times not all the time) it will back fire and feels like it has no power or sometimes die after i return to neutral. if i sit in neutral and rev it up a few times and try again it takes off with out any problems, maybe a little sluggish but no back firing, but the main issue seems to be the starting, its consistent as where the loss of power and back firing on take off is not......ANY advice would be greatly appreciated...

 

[RodeoTrent]

Re: 1994 5.8l Fi Volvo hard to get started after warmed up

forgot to say its a 94 OMC/Volvo Penta (Joint Venture) 5.8l Fuel Injection

 

[JustJason]

Re: 1994 5.8l Fi Volvo hard to get started after warmed up

is it blowing any black smoke?

 

[RodeoTrent]

Re: 1994 5.8l Fi Volvo hard to get started after warmed up

nope, no black smoke that i can see. but its all under water of course....

 

[JustJason]

Re: 1994 5.8l Fi Volvo hard to get started after warmed up

You'd still see it, even if it was underwater. I won't be black smoke all the time, just when it's hard starting if it's doing what I think it is. Next time it acts up have someone start the boat while you hang your head over the back.

 

[RodeoTrent]

Re: 1994 5.8l Fi Volvo hard to get started after warmed up

will do, ill be at the lake this weekend, what do you think might be the issue, what direction are u steering at....

 

[JustJason]

Re: 1994 5.8l Fi Volvo hard to get started after warmed up

fuel injectors are leaking upon shutdown and flooding the engine out a bit. If it still hard starts put the throttle lever in neutral and open it up to full while cranking, that will clear the flood out.

 

[RodeoTrent]

Re: 1994 5.8l Fi Volvo hard to get started after warmed up

sounds like a good idea, ill give it a shot, is there any way to test the injectors

 

[RodeoTrent]

Re: 1994 5.8l Fi Volvo hard to get started after warmed up

nope no black smoke, weirdest damn thing i have ever seen, i see a few other post like mine, and no one seems to have a clue i also noticed i have lost about 7mph on wot as well

 

[Danny Mc]

Re: 1994 5.8l Fi Volvo hard to get started after warmed up

If the eng is on computer a bad temp sensor signal will cause this prob., also if it has a mass airflo sensor and its dirty it can cause a bad reading.

 

[RodeoTrent]

Re: 1994 5.8l Fi Volvo hard to get started after warmed up

the boat usually stays about 150 155, i dont know if that is hot or not, and this model doesnt have a Mass airflow sensor, just a throttle body with an IAC

 

[haulnazz15]

Re: 1994 5.8l Fi Volvo hard to get started after warmed up

I would bet it has an air intake sensor of some sort. Also, the temp sensor for the ECU is NOT the same one used for the engine guage if I remember correctly. It would likely cause the ECU to run rich because it thinks the engine is cold.

 

[RodeoTrent]

Re: 1994 5.8l Fi Volvo hard to get started after warmed up

so, where would i find this sensor, and how can i test it? what should this engines operating temp be? what your saying is u think the ECU is thinking the engine is cold because when its actually warm

 

[Mohawkmtrs]

Re: 1994 5.8l Fi Volvo hard to get started after warmed up

In addition to the other suggestions, check fuel pressure (Key On, Engine Off), at Idle and for 5 minutes after shut-down. If pressure drops after shut-down, chances are leaking injector(s). If fuel pressure is not to specs., it may be a faulty fuel pressure regulator.

You may also want to check and clean the throttle body.

 

[RodeoTrent]

Re: 1994 5.8l Fi Volvo hard to get started after warmed up

these are all good suggestions, im going to the lake this after noon, whats a cheap pressure tester cost?

 

[Mohawkmtrs]

Re: 1994 5.8l Fi Volvo hard to get started after warmed up

If you're only going to use it once, it'll be cheaper to borrow/rent one.

 

[RodeoTrent]

Re: 1994 5.8l Fi Volvo hard to get started after warmed up

ok, i got the air charge temp sendor, where is this temp sender for the ECU? i cant find it, i would like to get these parts in hand before i go to the boat, im using this diagram from the volvo web site

http://www.volvopentastore.com/Fuel...*****.692987937--store_id.366--view_id.311978


and


http://www.volvopentastore.com/Uppe...*****.692987937--store_id.366--view_id.311961

 

[Todd157k]

Re: 1994 5.8l Fi Volvo hard to get started after warmed up

First, I don't know your boat at all... but I do know FI real well. The above idea of being rich is probably true however one other thing that can cause this is bad temp sending unit. The ecu doesn't know the motor is warm/hot and keeps looking at the "cold" tables. Also, leaking injectors can also be caused by bad connections on the injectors themselves. Too high of fuel pressure will cause over-rich conditions as well.

 

[Danny Mc]

Re: 1994 5.8l Fi Volvo hard to get started after warmed up

The IAC should be on the intake prolly behind and near the TB.

 

[RodeoTrent]

Re: 1994 5.8l Fi Volvo hard to get started after warmed up

the IAC was replaced at the end of last year, its working fine, the boat idels great, i found the location of the intake air charge sensor , but i am having trouble locating the engine block temp sensor