73 replies to this topic

[CHILL Gone DUTCH]

It's been warmer today

[Chris P Duck]

Coolant was 5degrees before I starting it. It was warmer than that before winter when I also had cold start problems, but I guess back then I also had an air leak...

Edited by Chris P Duck, 24 February 2015 - 05:37 PM.

[Chris P Duck]

Ps, you have a pm Chill

[CHILL Gone DUTCH]

Ps, you have a pm Chill

Pmed the answer 👌

[Chris P Duck]

Looking at the log my 470cc injectors seem to have hit 98% duty cycle at 6'400rpm Seems strange at stage 2.347b+ (aka ~250bhp) Also points to the fuel pump I guess?

[CHILL Gone DUTCH]

Have you sent it to me chris

[Chris P Duck]

Have you sent it to me chris

Just sent

[CHILL Gone DUTCH]

Have you done a fuel learn , Your fuel trims are way out

[Chris P Duck]

As discussed, yes fuel learn done, fuel trims seem ok in the general tab but in the logged graph seem quite large and one sided

[smiley]

A real shot in the dark here.

Fuel pipe inside pumphousing has a small hairline crack that requires a small amount of time to build up pressure to get fuel all the way to the engine, and leaks at full boost, just enough to not provide what´s needed at high rpm?

 

  

[Chris P Duck]

A real shot in the dark here. Fuel pipe inside pumphousing has a small hairline crack that requires a small amount of time to build up pressure to get fuel all the way to the engine, and leaks at full boost, just enough to not provide what´s needed at high rpm?     

Sounds plausible.

[smiley]

One of the dutch guys had that, but the crack was so big it did not turn over at all.

Maybe keep as a last resort, as it´s a nasty job to check.

 

Did you try that little squirty thing on the fuel pipe to see what pressure you have when it tries to start so bad? 

 

 

[Chris P Duck]

Little squirty thing?

[smiley]

On your intake fuel pipe just on the rail you have a small black cap you can unscrew.

Then you can press the inside to see if you have fuel pressure.

 

[Chris P Duck]

On your intake fuel pipe just on the rail you have a small black cap you can unscrew. Then you can press the inside to see if you have fuel pressure.  

There is during priming, cranking and running. But as soon as you stop the pressure drops to zero. That seems to be normal for the Walbro pump though.

[NickB787]

did you get a fuel pressure gauge sorted, I have one with a long line so you can check it while driving, let me know if you need it.

[smiley]

 

On your intake fuel pipe just on the rail you have a small black cap you can unscrew. Then you can press the inside to see if you have fuel pressure.  

That seems to be normal for the Walbro pump though.

 

 

Well, since you put that walbro in during the conversion, I assume you enlarged the inspection hole, so having a look at it will not hurt.

When you press the fuel pump housing in, I noticed the little plastic hose coming very close to a sharp plastic edge. 

Especially if you had to press hard to get it back in, you may have hurt something. 

 

Like i said, If all fails, have a look at it, as the 470 injectors should be more then up to the job. 

 

[Chris P Duck]

Thanks for the offer Nick. I ordered one off eBay yesterday though, should be here by the end of the week.

[Chris P Duck]

Well, since you put that walbro in during the conversion, I assume you enlarged the inspection hole, so having a look at it will not hurt.  

Unfortunately not as a 60l pro alloy tank went in at the same time.

[smiley]

If nobody comes up with an alternative plan of action, I would suggest to get your dremel out and have a look.