850 t5 difficult to start when cold

[merc85]

Hi there,

Stumped with this one, Swapped a engine over on my 850 t5, with a known good one. Runs spot on, doest smoke or use oil or water. etc

1st thing when cold, car spins over and over doesnt try to start then on the 10th turn catches and fires up without splutter.
Could a fault with the charcol cansiter caurse a problem?

Changed Leads, Cam sensor, Flywheel sensor, Fuel pump relay, Checked earth straps, temp sensor,

Didnt wana start this morning, turned over and over so i stopped cranking. waited a second, pressed the throttle to the floor turned the car over and shes fired up 1st time??

REALLY confuesed?? any help?

When warm car drives faultlessly no cel light or codes

[M-R-P]

Do these things have an automatic choke? maybe running off the idle control valve? might be worth investigation. Also, does the outside temp sensor govern how the car fuels on startup?

[oblark]

I've taken my outside temp sensor off and the car started no problems this morning.

[M-R-P]

I've taken my outside temp sensor off and the car started no problems this morning.

Rules that out then

[merc85]

i think the fuel line must have a hole somewhere, to rule this out im gona put a non retrun valve in and see what happens

[merc85]

Just got error code 2-1-4 Cps but chaged this cam sensor?? any help???

[oblark]

Just got error code 2-1-4 Cps but chaged this cam sensor?? any help???

Just looked in the Haynes book of lies and 2-1-4 is the rpm sensor

[stribo]

Do these things have an automatic choke? maybe running off the idle control valve? might be worth investigation. Also, does the outside temp sensor govern how the car fuels on startup?

The ECU would get the indormation from the Intake Air Temperature sensor, which is on the air pipe before the throttle body. Might be worth checking.

[oblark]

The ECU would get the indormation from the Intake Air Temperature sensor, which is on the air pipe before the throttle body. Might be worth checking.

I dont think the 850 has a intake air temp sensor

[stribo]

I dont think the 850 has a intake air temp sensor

Probably not that then.

[claymore]

fuel pump?

[Kingsford G]

If yr temp gauge moves when ignition on on a cold start it is yr temp sender.Mine had thermostat stack open and bad t/sender,starts broom broom now.

[merc85]

Thanks for the reply,

Temp sendor nearly new, Walbro Genuine pump 8 months old,

Changed the Cam sensor, cleared the code and out the original one back in, No difference in starting but no more CEL light either.

Also changed the flywheel sensor, No difference in starting, perhaps slightly better.

I ran the engine for around 5 mins @ tick over and also a min at higher rpm. turned the engine off.

Depressed the schider valve @ the end of the rail, and it basically just gave one short spert of fuel and that was that.

Should after 5 mins of runing it spray out?? starting to think i have a fuel system leak NOT a electrical problem.

[merc85]

Well just a update, Live lol, Bin under the rear of the car, Chasing up my belief of a vac line leak.....

Found a Large Broken Vac line (vent) egr/charcoal canister line lol going to the Check Valve (Roll over) Valve, i have now joined the line with vac tubing as its only vented vapour that it carries, primed the rail turned her over and on the 4 stroke she fired up, done it twice all seems good. Will try in the moring when she is proper cold and see how she gets on. Fingers crossed !

[merc85]

Back to square one, she didnt wanna start, ALso apears to back lack of fuel pressure in the rail!

Any ideas? maybe check valve in the fuel tank given up?

[oblark]

Have you tried taking the fuel line of the rail and cranking the engine over to how fast the fuel comes out ?

Just had a thought fuel filter ? when was it last changed ?

[Jamest5r]

Mine does the same, about 10 cranks in the very cold, if I add more fuel to the map it fires faster , in warm weather fires straight aeay, I'm guessing your not getting enough fuel. What is causing that though I have not idea. Maf maybe?

[mitchyboy01]

Try different fuel pressure regulator mate

[merc85]

Hi thanks for the reply,

The Pump isnt that old was a genuine walbro, Ive heard about the check valve being apart of the in tank assembly. Has anyone got a picture of this valve?

Injectors may be leaking as i had to remove them when changing the manifolds so certainly will look there. Also i have a spare fuel pressure reg i may fit that also.

Will keep you posted , thanks again

[merc85]

Have you tried taking the fuel line of the rail and cranking the engine over to how fast the fuel comes out ?

Just had a thought fuel filter ? when was it last changed ?

Not long ago buddy, this has all kicked off since changing the lump, and manifolds so ive must have disturb something,really thought the broken vac line was it may end up breaking the bloody thing if it carries on much longer