Flapper afm faulty ?

Flapper afm faulty ?

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Rockettvr

Original Poster:

1,804 posts

142 months

Thursday 24th July 2014
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mrzigazaga said:
Hi Ron...Glad to of helped mate...Out of interest did you changed the king lead?...If you did could you put the other one back on to see if that was the problem, Its always good when things get fixed but its nice to understand what actually was at fault...Far too often a load of bits get changed at once and the culprit is never found, It just helps to diagnose issues for others...Did you also clean out the mushroom breather on the N\S rocker cover...I sent you some filter foam so you can replace the crumbled remnants that was there..Cheers..Ziga
No still running on my existing leads - they were cleaned and given a wipe with a bit if wd40. Will be changing though as they're past they're best.
Cleaned the mushroom too - it was clear but as you say the foam was crumbling so I have put a bit of washing up sponge in as a temp.
Need to get a few more miles in to make sure all ok then I may try to get it back on a RR to see where my fueling is at.

mrzigazaga

18,534 posts

164 months

Thursday 24th July 2014
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Rockettvr said:
I have put a bit of washing up sponge in
Cool...That should keep it clean...rolleyes...See if you can see if the FPR has anything stamped on it, It should have the BAR rating on it...If its 2bar then i have a 2.5 bar solid state one you could have..Hopefully its running right now but an RR will be best to see what is going on...If you want to borrow the FPR before you have it on a RR then i have it in the boot and you can collect it from me at the Diner on Saturday or Sunday....(I will also make room for the spare wheel)...Cheers...Ziga

Rockettvr

Original Poster:

1,804 posts

142 months

Monday 10th November 2014
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Afternoon all
Resurrecting this thread as my old problem with erratic fueling (which never really went away) is back and worsening frown Zig was kind enough the lend me his spare TPS which certainly helped but never quite cured the problem. I was never quite convinced that the TPS was the culprit in the first place, I felt it was a contributing factor but not the root cause.
In the past the car ran pretty well most of the time only on occasions holding back on acceleration particularly when cold and the effect lessening as the engine warmed. This is happening on a more and more regular basis.
I have rechecked most of the efi components as per honest johns website and all is pretty spot on leading me to feel it's a mechanical rather than electrical fault
My current train of thought is that the fuel pressure regulator is slowly failing and not holding pressure in the fuel rail?
So does anyone have a recommendation for a Fuel Pressure Regulator ? ( Or a good unused one laying around for beer tokens?)
I've done the usual *bay and google searches but there's a huge range out there from £20 to £150 so was looking for someone to point me in the right direction
It's for an 1987 flapper
Thanks peeps thumbup
Ron

Jack Valiant

1,894 posts

235 months

Monday 10th November 2014
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Ron give me a call this evening fella!

mrzigazaga

18,534 posts

164 months

Monday 10th November 2014
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Hi Ron...Did you change the plug leads?...If need be i have a spare 2.5 bar FPR but it has been used...Ziga

Rockettvr

Original Poster:

1,804 posts

142 months

Tuesday 11th November 2014
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Jack Valiant said:
Ron give me a call this evening fella!
Sorry Chris missed this yesterday - will call tonight. thumbup

Rockettvr

Original Poster:

1,804 posts

142 months

Sunday 30th November 2014
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Afternoon gents.
My running issues are solved. Found an FSE "powerboost" fuel pressure regulator up for sale locally - fitted it this afternoon. Upon start up there was an obvious improvement in the idle - super smooth where before it was like I had a very slight misfire. On the road it's transformed the running. There's no more "holding back" during acceleration and the pick up when putting my foot down is instantaneous - before it would sort of cough before accelerating. Happy days
There is one fly in the ointment in that it keeps cutting out when braking to a halt - I'm putting it down to the fact that the regulator is "as fitted" ie I'm not sure I'm running the correct pressure as it didn't come with a gauge - once I've been able to set it correctly I'm hoping it'll sort that little issue - there's no "fuelly" smell at the exhaust so I recon it's running lean rather than rich. also need to make a bracket and resite the valve at the moment it's held (very firmly) in with a couple of cable ties. It's safe but not a long term solution. smile
Cheers all for your inputs
Ron

ed_crouch

1,169 posts

241 months

Sunday 30th November 2014
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Megasquirt3 extra.




mrzigazaga

18,534 posts

164 months

Sunday 30th November 2014
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Hi Ron...Is it a "Malpassi" type...Like this?
http://www.ebay.co.uk/itm/Fuel-Pressure-Regulator-...

Ideally you want a gauge on it so that you can set the WOT...38psi is about right...You don't want it running lean!..If your idle is low than the pressure will be as well..But without a gauge its hard to tell...Good that its a step in the right direction....
I have a Sytec one on mine...

The bracket came with it....Cheers..Ziga

Rockettvr

Original Poster:

1,804 posts

142 months

Sunday 30th November 2014
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Yes zig mine is the malpassi type. Ordered a gauge - hoping it will arrive midweek. The FPR came with a bracket but it doesn't fit properly - it may be for a different car ? Going to make one up it's only a bit of folded thin steel . Do you leave your gauge connected zig? Thought that was supposed to bugger them up !!!!

mrzigazaga

18,534 posts

164 months

Sunday 30th November 2014
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Hi mate...Yeah the gauge is on there permanently...Ziga

Rockettvr

Original Poster:

1,804 posts

142 months

Monday 1st December 2014
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The reason my bracket won't fit is that the kit is for a Hotwire system and the fuel rail is different. No matter 5 mins should sort out a suitable bracket. smile

Rockettvr

Original Poster:

1,804 posts

142 months

Saturday 6th December 2014
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Afternoon all. Have fitted a fuel pressure gauge this afternoon and adjusted the fuel pressure regulator. All seems to be well - idle is super smooth , instantaneous pick up on opening the taps, and pulls like a train on acceleration. I have done the adjustments as per some photo copied sheets that came with the FPR. ie:
Start car - remove and cap the vacuum pipe from the FPR - set FPR to 38 psi. - replace vacuum pipe to FPR - FPR then reads 24psi.
Is this correct ? The photocopied instructions are somewhat vague.

Jack Valiant

1,894 posts

235 months

Saturday 6th December 2014
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Hi Ron, the process is correct as described fella, with the engine warm and at idle block the vacuum line and the gauge should read 36-38 psi. Do not go over 40 psi on a stock 350i!

Sounds like the old girl is back on song yes nice one..

mrzigazaga

18,534 posts

164 months

Saturday 6th December 2014
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Nice one Ron...Its best adjusted when the car is up to temp..As Chris says..Clamp the vacuum from the FPR to the side of the plenum..You can remove it and do it but sometimes i have found it causes it to be a couple of psi too much..

Once it has settled at 36-38psi WOT which is what taking the vacuum pipe off does then it should be around 1.6-1.7 bar with it on..The standard solid state FPR is 2.5bar which is a tad over 36psi so already you are giving around 2psi more fuel..Don't panic if after a period of time it starts to drop at WOT or be higher at cold start..Don't start fiddling with it or it will become a constant thing..As i found out and sometimes that 2-4psi too much can cause severe over fuelling...Leaking injector pipes ..I have had a puddle of fuel in the Vee before when the psi was too high...I religiously check now every time i start the car for leaks..The clips are as tight as they should be, Any tighter then they will either break or cut into the hose..The psi will fluctuate from time to time.

I found the gauge to be a good indicator of the fuel pump failing ..It started to loose a fair bit of pressure and then would be too much...There was a random cutting out which used to happen once every couple of months or around 200 miles..There was also a popping that you would get on de-acceleration while i was accelerating, The fuel pressure was then playing up a lot then a week later the pump died...

It will also feel extra lively in the lovely cold winter air... smile

Rockettvr

Original Poster:

1,804 posts

142 months

Saturday 6th December 2014
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Cheers fellas
Thanks for confirming setting up procedure. Went for a quick test run after and she just sings - smooth,responsive and (maybe psychological ) a little faster? The stalling when coming to a halt has been remedied too. Checked all over the fuel rail etc on my return for leaks but it's all dry as a bone smile Plenty of pops and bangs in the cold air too although my ears were frozen by the time I got home but it was such a bright afternoon there was no way the roof was staying up. biggrin
Must get to a meet soon thumbup