adrial

After driving the car for a good bit today (I guess about 20-30 min, stop for 5, another 20 min, stop for 15, 15 mins, stop for 5, 10 mins, stop for 30 mins, then when driving after about 10 mins I had hit the clutch coming to a light...and when I got closer to the light I looked at the dash...tach at zero and all the lights on. I go to restart it, no go. After a few tries keeping my foot on gas a bit it gets going and drives fine, though I didn't try any boost.

When I get home, the car is idling at 1200...I disable the idle stabilizer at the test port...no dice...still holds 1200rpm...

TPS is fresh, idle stabilizer just cleaned but needs to be replaced, fuel filter just replaced, 3 bar fuel pressure regulator just installed along with steve R chips...fuel rail doesn't hold pressure (I take out the big bolt on the end and fuel just dribbles out...I changed the fuel filter, fuel just dribbled out...). The black O-rings on the tops of the injectors were just replaced as well...Spark plugs were replaced and gapped 5k miles ago, maybe a little more. Oh, DME relay just replaced also.

I just recieved my cap and rotor from paragon. I will install them when I get back from vacation on monday (leaving fri morning, tomorow). So, either the injectors are leaking into the cylinders and need to be cleaned/balanced, maybe replaced...or the fuel dampner is shot and needs to be replaced.

Back to the problem at hand...
It only does this after the car has been driven for a good amount of time. Last time it did this was after I had driven for about an hour, stop for 15, and then another hour...Towards the end of that 2nd hour it died..and I was able to start it up and move to the side, but then it died again. I let it sit for a while and then started it up and drove home no problem, I did not have any idle issues that itme.

When boosting at part throttle it kinda bucks a tiny bit..but WOT is smooth.

I just dumped money on other cars and had a little argument with work...so its not a good time to start throwing money around...but this is my baby so I will of course give her what she needs...as long as its not many hundreds of dollars.

I drive the car everyday to work and what not and it has no problems unless the car is driven a lot. During all this my temp gauge was sitting where it belonged...towards the bottom of the range between 2nd and 3rd bars.

TIA

Deepice

This is a stab but Vacume?

adrial

[quote]Originally posted by deepice:
<strong>This is a stab but Vacume?</strong><hr></blockquote>

All hard vac lines just replaced...I looked at everything but I didn't see anything obvious.

The intake boot to the turbo was also just replaced.

I haven't started the car since, but I expect it will idle perfectly...

emilysgranny

Adrial; Possible something electrical is getting to hot, maybe the fuel pump or the dme?.

adrial

Oh yea, this may be important...

The car doesn't do this during autocross...even when there are multiple (2, 3, 4) WOT full boost straights that take it up to 5k in 2nd and beyond. The underhood temps are roasting after autox...so if something is overheating...I dont expect it to be in the engine bay.

Next time it does it I will put my hand on the DME (I still haven't put that wooden cover back on)...see if thats heating up, though I'm not sure I'd be able to feel it externally...

Although if its something overheating...why was I able to start it back up so quickly today and drive away? (I stopped for maybe 15 seconds before I got moving again. It seems the key to getting it started up and staying running when it does this is keeping my foot on the gas when I start it up...hope the extra description helps!)

adrial

I finished replacing the distributor cap and rotor and took the car for a short 5 min drive...

The car stalled when I hit the clutch, about to come up the driveway...tried to restart it 5 or so times...it would catch and then die. Let it sit for 30 seconds/pushed the car out of the way...and it started and I was able to get up the driveway fine.

This is the first time that this has happened with a cold engine and the third time that this has happened in a period of 3 or so months.

TIA for any suggestions,
Adrial

special tool

You've tested the pump?

Der Cupmeister

Was this happening before you put the chips in ?
Also could possible be one or more bad solder connections in the DME ?

<img src="confused.gif" border="0">

adrial

I haven't tested the fuel pump yet, I plan to do that today...

It didn't do this before the Steve R chips or the 3 bar fpr, but given that this is an intermittent problem I don't think I can blame them...The chips and 3 bar fpr were installed a month or 2 ago I think? So that means the problem started less than that long ago.

I will do more testing today and see how the car drives...see if it boosts OK.

keep em coming

thanks,
Adrial

EDIT: I just went out and started it. It idled for 30 seconds, then almost stalled. I let it idle for another 30 seconds and then I backed it out of the garage at 1200rpm...half way out of the garage it stalled. I can start it back up, but it then dies quickly.
When it stalls it sounds like it *wants* to stay running...but isn't getting enough gas.

If it were electrical the car would just shut off, no? It kind of gradually stalls.

Looks like my hopes for making the autocross sunday are shot...unless a local auto parts store has a fuel pump...hah yea right..

According to the factory manuals the fuel pump should flow at least 850 cubic cm's in 30 seconds? thats .85L, sounds like an awful lot of gas??? (This is if I disconnect the fuel line to the FPR)

Oh yea, and if it means anything..when I started the car up at first this morning and it was idling, the injectors sounded louder than normal???

adrial

The fuel pump flows 1375ml (1375 cubic centimeters) in 30 seconds. I did the test according to the factory manuals...

PorscheG96

Take a look at this thread, smarts:

<a href="http://forums.rennlist.com/forums/ultimatebb.php?ubb=get_topic&f=15&t=007133" target="_blank">http://forums.rennlist.com/forums/ultimatebb.php?ubb=get_topic&f=15&t=007133</a>

I told you yesterday but you're too stubborn to check it out for yourself. Make note of the RUNNING TIME before your car stalls, then look at mine. Replacing the FPR and the dampener solved it, the fuel pressure was spiking and the computer shut the car down each time. If I were you I'd run to the dealer today and pick up a dampener [or wherever you can get one] and replace it before the autocross. If that doesn't work swap your stock FPR back into the car. I'm pretty sure one of those is at fault for your problem. If they didn't work, the parts cost was cheap and you can narrow down those components as causes of your car stalling.

adrial

Running time? About 2 seconds.

Running time when I first started it up this morning, 1 minute.

Running time last night ~5 mins.

It varies/is getting worse.

adrial

Put the stock FPR back in, same exact problem.

No dealers have the fuel dampner in stock.

Its down to dampner or injectors, most likely the dampner.

None of the 3 dealers I contacted have the dampner in stock.

Operator

damn. that sucks! did you try calling vw/audi dealers? sometimes they have porsche parts.... because they share parts.. just a thought!

i guess im gonna have to beat dan myself on sunday...

adrial

Problem solved.

The air flow meter was the source of my problems! I first unplugged it
(under jay cohen's live over the phone instruction), and the car actually
idled, although rough. So we knew that was the problem area. I took off
the black plastic cover (under Jay cohen's instruction) and bent the
wiper arms a tiny bit to move the arms to a better part of the carbon
strip...presto chango...car works great.

I'm about to take it out for a spin to do some boost runs, but I think
the problem is solved, at least for now.

I need to test the air flow meter (testing voltages/resistances)...but
even if I find a problem, I am happy that I know WHAT the problem is.

Twice in a single week, rennlist saves the day. Mild mannered e-mail
list, or super hero? haha

--Adrial, one happy camper.