Westfield Miata

Questions :: RE: rich running still.........

Author: Big Cheese Dog
Posted: Sat Jul 31, 2010 5:06 pm (GMT -7)
Topic Replies: 10

I don't make this stuff up, you know

Questions :: RE: rich running still.........

Author: tigbrother
Posted: Sat Jul 31, 2010 9:35 am (GMT -7)
Topic Replies: 10

well, have tested the fuel pressure and................. its running at 65psi

Houston - i think we have our problem, tracking down a new FPR now, possibly going for an adjustable one.

cheers for the advice Big Cheese Dog

Questions :: RE: rich running still.........

Author: Big Cheese Dog
Posted: Sat Jul 31, 2010 7:23 am (GMT -7)
Topic Replies: 10

Make sure you Tee into the front/feed line, not the rear return from the fpr. Should be be maybe 36-40 with vac signal hose on and running, should jump 5-6 psi when you pull the vac hose off the fpr. Good luck!

Questions :: RE: rich running still.........

Author: tigbrother
Posted: Fri Jul 30, 2010 10:34 am (GMT -7)
Topic Replies: 10

ok detailed instructions on how to test the system and pressures and a gauge in my possession, so ready for the big test tomorrow, i am actually hoping that its fuel pressure, but knowing my luck it wont be........

Questions :: RE: rich running still.........

Author: tigbrother
Posted: Fri Jul 30, 2010 6:15 am (GMT -7)
Topic Replies: 10

fuel pressure test kit on its way this afternoon i hope, what pressure should i be looking for?

Questions :: RE: Struggling with fuel?

Author: dave1888
Posted: Thu Jul 29, 2010 4:47 pm (GMT -7)
Topic Replies: 4

Problem resolved it turned out to be a faulty ECU, i think i might have blown something inside whilst connecting various wires.
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Upgrading Tiger E1 to MX5 NB running gear and learning to weld.

Questions :: RE: Diff mounts off a bit

Author: tigbrother
Posted: Thu Jul 29, 2010 11:35 am (GMT -7)
Topic Replies: 1

yeah standard issue distorted and bent diff mounts, i just got longer bolts and packed the gap out with washers. also make sure the mounts dont throw the diff out by twisting it round, which could cause clearance issue with the diff / prop shaft against the trans tunnel.

Questions :: Diff mounts off a bit

Author: miatacarpc
Subject: Diff mounts off a bit
Posted: Thu Jul 29, 2010 9:29 am (GMT -7)
Topic Replies: 1

my rear upright diff mounts (the three-point attached piece that the diff "ears" connect to) don't quite line up properly with the rear shock mount braces.

The bolt holes are correctly aligned, but with a bolt in there, there's a 10mm gap between the shock mount bracket and the top attachment point of the diff mount bracket. Not sure If I should just use a longer bolt and will the gap with washers? The gap is only 5mm on the other side, which is about right for 2 washers.

If I use a longer bolt, is there a risk it will interfere with the boot box?
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My BRG 7 build

Questions :: RE: rich running still.........

Author: Big Cheese Dog
Posted: Thu Jul 29, 2010 8:36 am (GMT -7)
Topic Replies: 10

Bet a fuel pressure gauge would cost less than the other guesses you've bought so far
It sounds like the 02 sensor is working ok in closed loop, but your mixture is so rich it's beyond the range of correction.
Is the vacuum hose hooked up to the FPR? Does it have vacuum?

Questions :: RE: rich running still.........

Author: tigbrother
Posted: Thu Jul 29, 2010 5:26 am (GMT -7)
Topic Replies: 10

Hi Mark

the take off for the brake servo has been bunged up and siliconed off so that shouldnt be an issue, as far as i can see every thing else is also sealed off now in terms of intake tubes etc,

It seems as if the engine is stuck in closed / open loop mode, and its running in a limp mode, where it enriches the mixture to get you home, (as apposed to leaning off which is dangerous)

Questions :: RE: rich running still.........

Author: smokey mow
Subject: Re: rich running still.........
Posted: Thu Jul 29, 2010 4:51 am (GMT -7)
Topic Replies: 10

tigbrother wrote:

i have all the air intake checked for vacuum leaks, all seals / gaskets have been replaced, including injector seals, and no sign of any problems there.

Hi Rick, looking through your photos do you now have a cover on the vacuum take-off on the inlet manifold for the brake servo. I notice there's not anything fitted in any of the pics.

Also worth double checking the underside of the manifold for any open vacuum take-offs, there's a couple hidden away under there that I missed on mine, but it still ran fine without.
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www.mx5westfield.co.uk

Questions :: RE: rich running still.........

Author: tigbrother
Posted: Thu Jul 29, 2010 4:25 am (GMT -7)
Topic Replies: 10

not yet big cheese, trying to get hold of some test kit this weekend,

Questions :: RE: rich running still.........

Author: Big Cheese Dog
Posted: Wed Jul 28, 2010 6:26 pm (GMT -7)
Topic Replies: 10

Did you ever check the fuel pressure?

Questions :: rich running still.........

Author: tigbrother
Subject: rich running still.........
Posted: Wed Jul 28, 2010 2:36 pm (GMT -7)
Topic Replies: 10

Hey guys

Here we go again.......

So after my last topic i now have the car running what seems to be all ok........ except for 11.5% co2 level

it should be under 3.5%, hydro carbon out put is perfectly normal.

the engine its self now runs beautifully, i do still still get a very small amount of black smoke on hard acceleration, but has a strong smell of unburnt fuel due to running very very rich.

now i have replaced/ tested most of the sensors (new MAF, New 02 sensor, water temp sensor running at 2.2k when cold, and 175 when hot)

the ECU is only throwing out a code 17 occasionally, which is 02 sensor value not changing, (due to detecting a rich mixture) even after fitting a new 02 sensor.

what are my other options to check?

Now reading on other forums the ECU can go into a 'limp mode' if one of the input sensors fails making it run very rich which is safer for the engine, but this should throw up an associated fault code, but i have nothing.

i have had all the plugs out , and they are not fouled with black soot, and they are all the same color which rules out a faulty injector?

i have all the air intake checked for vacuum leaks, all seals / gaskets have been replaced, including injector seals, and no sign of any problems there.

i suppose the next logical step would be to check fuel pressure, and possibly be looking at the throttle position sensor for any faults as well...

any idea on what other items to check or look for that i might have over looked,

Need to get this sorted for my IVA retest ASAP

My build :: RE: BRG 7 build log

Author: smokey mow
Posted: Sat Jul 24, 2010 12:59 am (GMT -7)
Topic Replies: 10

miatacarpc wrote:

So what does a "correct" set look like - any cutouts?

Mine had no cut outs and the gators for the gearshift and handbrake were supplied loose. It was easy enought to then cut the carpet exactly where I needed and stitch the gators in the right place.

Oh and my tunnel top panel had the cut-out in the right place but was 6" too short!
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www.mx5westfield.co.uk