150 optimax

nauti nic · 17 September 2014, 17:32

Looking for some help my optimax starts,runs and ticks over fine but once it's up to temperature if stopped it won't start straight away I need to leave it for 5 minutes nothing coming up on the diagnostics and no faults on smartcraft.

Dry Run · 18 September 2014, 07:56

Some questions: -

Is this a recent fault?
What happens before the 5 minute wait if you try and start the engine? Turns over?
Have you got a priming bulb and do you use it?

need a little more info.

Cheers Steve

nauti nic · 18 September 2014, 08:54

I bought it second hand it's done 600hrs it's a 2002 but wasn't fitted new 2007 I have had some issues had to replace alternator and sort some damaged wires within the harness due to the old alternator failing.Its had a full service and seemed to be running fine now it's started doing this.
Yes it's a recent fault,it will just turns over and won't fire but if you leave it for five minutes it starts and ticks over fine.I do have a priming bulb and I prim it till before starting.Thanks for any help I'm starting to lose faith in it Steven

Under the Thumb · 18 September 2014, 10:25

With the cowling off, do you hear the fuel pump run for 20 to 30 secs when you turn the ignition key on? pump is on port side of engine.

Does the revcounter needle move away from 0 when you're cranking it over - if it doesnt this normally suggests the crank position sensor is dodgy.

nauti nic · 18 September 2014, 11:01

Thanks for your reply yes you can hear the fuel pump not sure if it's runs for 20/30 seconds I'll check the rev counter tomorrow I'm going to check the plugs are getting a spark when it won't fire that should rule out that out.

Jizm · 18 September 2014, 15:46

The pumps only run for a couple of seconds when switched on to prime/pressurise and it should have a primer bulb. Who serviced it?

Pedrode · 13 October 2014, 22:24

If it starts again after 5 mins, might that suggest a temperature issue i.e the engine needs to cool before it re-starts. Had a similar issue (different engine) and turned out to be a leaky thermostat.

nauti nic · 13 October 2014, 22:54

I got it sorted it was a faulty main relay.Cheers

Jizm · 14 October 2014, 16:33

Result. Got a few spares for 150 optis for future reference.

Searider · 14 October 2014, 18:12

Quote:

Originally Posted by nauti nic

I got it sorted it was a faulty main relay.Cheers

That's the only thing that has ever stopped my opti.

I didn't know at the time but was informed that the power trim relay is the same and can be substituted.

nauti nic · 14 October 2014, 18:46

I started losing heart and changed to a suzuki df140 wish I'd waited a couple of weeks.Its now on a ribcraft 585 that I've got advertised on here good package for someone and the engine runs perfect now.

A1an · 14 October 2014, 19:48

Did you have the engine advertised on B&O?

nauti nic · 14 October 2014, 19:57

Yip still on I'll need to remove it.

A1an · 14 October 2014, 19:58

Pah!

Il take that one off my list then

nauti nic · 14 October 2014, 20:03

I've had a message from someone on here ask if I'm willing to sell the rib and trailer only so It might still be for sale.

Turbodiesel · 14 October 2014, 20:03

You need to get an air pressure gauge and fuel pressure gauge on it. The CDS system will only see electronic faults from the senders.

A1an · 14 October 2014, 20:05

Keep me in mind if you do please

nauti nic · 14 October 2014, 20:08

Air and fuel pressures have been done and full diagnostics all injectors fuel pumps etc everything good

Turbodiesel · 14 October 2014, 22:30

Ok next time it won't start check the tacho when cranking, see if it registers rpm. I have seen the flywheel crank sensor play up. If the engine can't see the rpm it won't like starting. Had a few Optis do this. The CDS won't pick it up but either have a look at the rpm on the CDS or check the tacho.