Author Topic: car is "missing" -HELP STILLURGENTLY NEEDED (Read 5986 times)

matsu · « **on:** June 30, 2011, 03:48:00 pm »

hi gang
had stage 2 done-the car is so much more than it was lol

but last few days- it seems to be missing., a bit stuttery esp theough 2-3500 rpm- she also hates pottering around at the mo- and its intermittent-not all the time.
vagcom threw no faults/codes so WTF could it be?
also i,m not sure if my imgination but the exhaust seems to be much boomier these past few days and i,m sure i can smell petrol fumes more than ive noticed before but that might just be me getting paranoid
i,m in touch by email with the mapper-just needed some input from the techies on here.

could it be heat soak-its been mental hot or even fuel pump issues??
thanks in advance

matsu

matsu · « **Reply #1 on:** June 30, 2011, 07:20:47 pm »

anyone?

matsu

Hurdy · « **Reply #2 on:** June 30, 2011, 08:16:17 pm »

Did you have anything else done apart from stage 2 around the same time?

If not then there is a raft of parts that could have gone with the extra pressure on the car.

If you can smell petrol and the parts on the car are okay, then the car may just be running too rich on the map and the hot weather may have made this worse (less volume of air/metre squared in hot weather). Running rich can also affect the sparkplugs. Have you got anyone who has VCDS near you who can look at your AFR?

Don't panic yet Matsu

matsu · « **Reply #3 on:** June 30, 2011, 08:34:51 pm »

i had it put on the vagcom on weds mate and it showed no codes but to b honest-he is very old school and looked at me as if to say.....well, you went and made all these changes

will any diagnostic system show up what youre thinking about ,or just a vagcom unit?
dont forget,its the forum numpty

you talking to mrH

and tank you
matsu

Hurdy · « **Reply #4 on:** June 30, 2011, 11:29:37 pm »

You need to use VAGCOM reading the AFR (air to fuel ratio) with the car under load on a run from around 2000rpm to the redline, this will give you a reading and then post up the logs if you can.

bacillus · « **Reply #5 on:** June 30, 2011, 11:34:58 pm »

Quote from: Hurdy on June 30, 2011, 11:29:37 pm

You need to use VAGCOM reading the AFR (air to fuel ratio) with the car under load on a run from around 2000rpm to the redline, this will give you a reading and then post up the logs if you can.

Just to elaborate on this, you need to log block 031 for your lambda. You get the AFR by multiplying the lambda value by 14.7

matsu · « **Reply #6 on:** July 01, 2011, 12:31:21 pm »

ok thanks guys
i think i need to go back to storm and get on the RR. get this sorted!

matsu

56OctyVRS · « **Reply #7 on:** July 01, 2011, 12:40:12 pm »

Mine has also started missing in the past 2 days. Done nothing to the car apart from fill up with a tank of fuel a couple of days ago. Mine misses but only when the engine is under load at 2k in 4th gear. I was seeing if my P0299 fault code was there and testing the boost on the car. Its fine when going through the gears but just misses under load when in higher gear. I am going to run the tank of fuel down as it could be a bad batch of fuel. I use Momentum 99, what fuel are you using as it could be one and the same problem.

Janner_Sy · « **Reply #8 on:** July 01, 2011, 01:24:28 pm »

Could be the pcv

56OctyVRS · « **Reply #9 on:** July 01, 2011, 01:47:44 pm »

Im running a catch can now and have checked all the hoses etc. It is a strange one but it only started in the last couple of days so I am thinking poor petrol quality.

matsu · « **Reply #10 on:** July 13, 2011, 07:53:22 pm »

took the car back to storm today and we reckon its the maf on the intake.
the vcds showed no faults and bloody typically the car behaved impeccibly when tested on a few good runs whilst trying to replicate the missing issue!
and yet it did it temporarily on the drive up there!

we removed the maf and it was red hot,...as was the intake pipe- its a neuspeed p-flo.. and i noticed the sh*tzen mechanic hasnt put the heat sheild on either so we are assuming its heat that is almost cooking the sensor.
we replaced it and i,m getting the heat shield put on ASAP, andi,m also going to coat it in high temp paint to see if it stops it.
i was thinking od either wrapping the pipe in heat tape...or getting the extension pipe to run the filter down to behind the fog lights.....failing that i,m gonna have to look at twintake.....again but i,m skint

anyone in the know ...please add your thoughts to try help me out.
thank you in advance
matsu

56OctyVRS · « **Reply #11 on:** July 13, 2011, 08:04:57 pm »

When I had my intake on I fitted the heat shield and just wrapped the pipe with exhaust wrap. Equally you can buy heat shield tape and wrap that around. I recently put heat shielding tape under my OE engine cover that reflects upto 90% of the radiant heat. It cost me £16 for 10 meters and that would be more than enough to completely wrap the pipe.
I puchased mine from here http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=300563370760&category=38786&_trksid=p5197.c0.m619

Jk911 · « **Reply #12 on:** July 13, 2011, 10:05:19 pm »

I'm running a p flow, as long as you fit the heat shield provided with the kit you should be ok

martziniuk · « **Reply #13 on:** July 13, 2011, 10:19:08 pm »

Heat shield? I never got one with the Trueseal and I have no probs. Tbh the air is in the tube for a fraction of a second it's just not enough time to get hot enough plus it goes through the intercooler after that

56OctyVRS · « **Reply #14 on:** July 13, 2011, 10:44:01 pm »

Quote from: martziniuk on July 13, 2011, 10:19:08 pm

Heat shield? I never got one with the Trueseal and I have no probs. Tbh the air is in the tube for a fraction of a second it's just not enough time to get hot enough plus it goes through the intercooler after that

It does my friend however if you draw in cooler air it takes less of an effort for the intercooler to cool it back down after going through the turbocharger as it is denser. Hot air is not as dense so doesnt cool down as much, which is why all the racing teams in WRC, F1 etc fit heat shielding to prevent heatsoak and to keep every last hp they can. I cant find the page I read it on to link it but it was very in depth about the turbocharging process and heatsoak, which is what prompted me to put heat shielding under my OE engine cover. Since fitting it my engine feels perkier and the engine cover is only mildly warm to touch, even reaching round to where the bottom of the air box is above the turbo/manifold it is a lot cooler after driving. Where as before fitting the heat shielding it was bloody hot to touch!