gota911

Bawhahahaha!!!

Phil, I busted out laughing when I read that ^!

Good job on cleaning the throttle body.

redridge

care to elaborate? oh.... is this the water leaking? clean the drains yet? still leaking?

philooo

MAN I am pissed, all day the car ran great, even this morning start was a breeze. Tonight I went to the movies, see 'prince of persia', great movie... Back to the car which was parked in the outdoor parking lot and bang, same crap, low idle, and engine died.

second start idle not too bad, but as soon as I released the clutch it died..

I waited 5 minutes then restart, keeping feet on the clutch just in case, idle was low, went super low, but the ECU saved it with an automated throttle blip. I waited 10 minutes for it to warm up and then the car drove like nothing happened. During the whole time until warm the idle felt really weak.

What in the hell can this be... could it be that one of my catalytic converter is dead ? I have another thread about engine noise and it really sound like one of my cat. it is making a hell of a noise especially when warm...

Any possible relation between my dead catalytic converter and this idle problem ?

So next step sunday I am checking the spark plugs... arghhh

philooo

I am sorry to hear you can't find the problem, I am afraid you are kind of like me, will have to keep shooting in the dark. Must be a drain, I assume you'll have to put a water hose in there and try to see where it start dripping first. may be buy one of those snake camera.

RPMulli

https://rennlist.com/forums/996-foru...nto-cabin.html

RPMulli

phil, i think you need to dive into that list of things to check that everyone posted on your thread. MAF, fuel pressure, plugs, ignition switch. First, i would give it a tune up with the new filter, oil, plugs. Just to eliminate the basics first. And clean that MAF, that gunk that was on your throttle body is on the MAF sensor element for sure.

philooo

does anyone know what should be the values for TRA, FRA and air flow (over the MAF) ?

I have been doing some reading and idle seems to be link to those values, I plan on taking them tomorrow morning during my cold start, but would be nice to compare them to regular value.

RPMulli

a shop manual would be handy right about now.

RPMulli

Phil, your gremlins have attacked my car... thanks. https://rennlist.com/forums/996-foru...ml#post7680967

RPMulli

Any updates on the issue?

philooo

ok so today again it won't start in the morning.

I removed the vaccum line plugged on top of the throttle body and spray some carb cleaner and it would start right away..for a second or two.

I assume the fuel do not reach the engine in the morning for some unknown reason... I bet some air valve somewhere doesn't work

I heard things about the fuel tank breather valve, anyone knows where that is located ?

Ahsai

Looks like you're getting somewhere. In the morning when you turn the key to the ignition position, there should be a very distinct noise of the fuel pump priming for a second or so. Do you hear that at all? I think to diagnose further you will need to tap into the fuel rail with a fuel pressure gauge to verify the pressure (~3.5bar I think).

Also, have you checked the air temp, coolant temp right before you start the car in the morning? You can get a OBDII cable for $30 or so from ebay and hook it up to a laptop with free OBDII s/w that allows you to read time sensor values like air temp, coolant temp, fuel trim, etc.

Divot

Here is a manual resource.

manual

Good luck, guys.

philooo

I did check the temperature this morning, but considering the car start just fine if I wait 30 minutes, with the same temperature, I don't really think it matters,no ?

also how come the fuel pressure could be different in the morning, jsut by waiting 30 minutes ?

I think the only thing that make sense is some pressure/release valve, that does it job if left alone for a long time. I assume it would make sense if the valve was clogged or something no ?

Ahsai

Yes, you can try to deduce/guess what is wrong but if you want to zoom in the culprit quickly, you still need direct measurements. The fuel pump is pretty powerful so as long as it's not clogged and there's fuel and power supplied, it should pump enough fuel to get your engine started at least. I cannot imagine a clogged vent valve will prevent fuel from reaching the engine. A rough idle possible but not starting at all is unlikely.