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Author Topic: Fuel cut  (Read 10151 times)

Offline bacillus

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Re: Fuel cut
« Reply #15 on: August 25, 2009, 08:50:42 am »
btw what year is your car and has it ever been recalled to change the fuel pressure sensor?
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Offline vRStu

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Re: Fuel cut
« Reply #16 on: August 25, 2009, 08:54:57 am »
Quote from: bacillus on August 25, 2009, 08:50:42 am
has it ever been recalled to change the fuel pressure sensor?

Quote from: Sugen on August 25, 2009, 06:30:55 am

Things that have been replaced , Cam, Cam Follower, HPFP, Low pressure sensor as part of TSB.
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Offline Sugen

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Re: Fuel cut
« Reply #17 on: August 25, 2009, 09:15:32 am »
Quote from: bacillus on August 25, 2009, 08:46:27 am
You said that you changed your cam follower, what did the old one look like? Did you visually inspect your cam for wear at that time?

That aside, you really need to post some live logging data to help you out.

Will drop boost and see what happens .
Old cam follower didn't show much sign of wear,  visually inspected cam yesterday it did show signs off wear on the lobe not that much cam and cam follower were replaced 2 days apart.
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Offline bacillus

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Re: Fuel cut
« Reply #18 on: August 25, 2009, 10:07:17 am »
Not the most complete of logs but what strikes me is your WG duty cycle seems pegged at 99% indicating a boost leak.

This may account for some uncomfortable timing pull and from what's shown, your boost request isn't being met.

Are you using the original DV?
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Offline Sugen

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Re: Fuel cut
« Reply #19 on: August 25, 2009, 10:31:57 am »
Quote from: bacillus on August 25, 2009, 10:07:17 am
Not the most complete of logs but what strikes me is your WG duty cycle seems pegged at 99% indicating a boost leak.

This may account for some uncomfortable timing pull and from what's shown, your boost request isn't being met.

Are you using the original DV?

Yip noted and looking into that would like to sort this fueling issue first and then sort boost leak
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Offline bacillus

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Re: Fuel cut
« Reply #20 on: August 25, 2009, 02:02:36 pm »
I don't know how clean petrol from your stations are but if you haven't changed your petrol filter yet in trying to sort  this low pressure problem, I suggest you do so asap.
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Offline Sugen

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Re: Fuel cut
« Reply #21 on: August 27, 2009, 06:42:50 am »
Quote from: bacillus on August 25, 2009, 02:02:36 pm
I don't know how clean petrol from your stations are but if you haven't changed your petrol filter yet in trying to sort  this low pressure problem, I suggest you do so asap.

Fuel filter has been replaced when cam was replaced about 5 days ago. Did some more logging yesterday and it seems there is nothing wrong with the low pressure pump in the tank pressures don't drop below 4.8 bar at some instances the rest of the time its above 5 bar. Load on pump somtimes reaches 90% but generally between 60-80%.

Did quite a bit of testing yesterday and this is what I've noticed. When loading it in say 4th gear I get the slight hesitation almost all time thereafter it seems as though the vehicle goes into a soft limp mode of sorts where it now request less boost etc not the normal Revo settings. The only way to revert back is to turn vehicle off and then start it again.

Rail pressures are still dropping intermittently by as much as 40bar  so it seems I will have to fit an upgraded pump what concerns me however is that according to Carl at Revo they have not experienced such issues on the Stage 2 map.

So do I install the upgraded pump and risk having issues when i decide to go Stage 2 + ? What else can I test ? I have now changed my REvo settings to B6 T3 F9 will try and do some testing today.
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Offline Janner_Sy

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Re: Fuel cut
« Reply #22 on: August 27, 2009, 06:46:58 am »
I had the same sort of issue with my car in january, it turned out to be the fuel sender that had gone tits up, and was sending incorrect readings resulting in the car going in limp mode. Butontop of that, where i had my car serviced they had also rammed the engine cover back on breaking the fuel regulator bit ontop of the hpfp.  both were replaced, problem solved :happy2:
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Offline Sugen

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Re: Fuel cut
« Reply #23 on: August 27, 2009, 07:05:22 am »
Quote from: simonskerton on August 27, 2009, 06:46:58 am
I had the same sort of issue with my car in january, it turned out to be the fuel sender that had gone tits up, and was sending incorrect readings resulting in the car going in limp mode. Butontop of that, where i had my car serviced they had also rammed the engine cover back on breaking the fuel regulator bit ontop of the hpfp.  both were replaced, problem solved :happy2:

Part number of fuel sender perhaps  ? 
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Offline Janner_Sy

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Re: Fuel cut
« Reply #24 on: August 27, 2009, 07:49:42 am »
sorry mate not a clue. I had i done at a dealership
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Offline Poverty

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Re: Fuel cut
« Reply #25 on: October 24, 2009, 09:24:07 pm »
how did this turn out?
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Offline bacillus

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Re: Fuel cut
« Reply #26 on: October 24, 2009, 11:57:40 pm »
Quote from: Poverty on October 24, 2009, 09:24:07 pm
how did this turn out?

Don't know as he was supposed to send me some of his logs to peruse but never did...
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Offline Poverty

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Re: Fuel cut
« Reply #27 on: October 25, 2009, 12:25:45 pm »
Thats a shame.
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Offline Sugen

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Re: Fuel cut
« Reply #28 on: November 02, 2009, 05:28:06 am »
Hey guys sorry that i've been missing had some work projects to round off. Anyway news on my car, upgraded to Autotech Hpfp and fuel cuts were still intermittent on Revo stg2. I then tried the Revo 2+ file and have not had a problem since (touch wood). Requested boost is being met WG duty cycle  comes down quite nicely and timing pull is reduced as well. Will look into Water Meth install soon and report back on that.
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