I replaced my PD today and after I put everyting back together, I started the car but it runs super rich and does not idle. In fact, If I don't keep the revs around 3k the car doesn't run at all, regardless of what I do with the gas pedal. It backfires quite a bit and the exhaust smells bitter. I already tested for vac leaks by spraying carb cleaner around the engine bay but nothing happened. As soon as I start the car whether or not it's in gear it revs realy quikly up to 3 k and then dies unless I keep it at or above 3k. If it drops below, even if I floor the pedal, it just dies. I already searched to the best of my ability (I wasn't really sure how to search for this problem). It idled fine before I took the upper manifold off to get to the PD so I thonk all the idle equipment is still in spec. Thanks much

 

It sounds simple, but check your afm connections and the main intake pipe for any forgotten connections because if that pipe isn't tightly sealed it will be too big to see bubbles from. You'll feel really stupid if it's just a hose clamp you forgot to tighten - ask me how I know.

 

I don't mean to thread jack, but I have a similar question. My TII starts fine, and is set to idle around 1100 RPMs for the break in. It's got ~350 miles on it. However, it doesn't like to idle either. It will slowly sputter down and die, and I can keep it running by giving it gas. It seems like it will idle better with the clutch depressed than if I just leave it in neutral. It also seems like the problem is erratic, sometimes it idles fine, other times it dies. Any ideas as to what the problem could be or how to check?

 

afm connections where? The main intake pipe is tightened all the way so i don't think it could be leaking. Is there anything electrical like a connecter I missed or connected backward? thanks

 

There is an electrical connector that connects to the AFM and there are 2 air hoses that connect to the intake pipe as well. Make sure they are all connected.

 

I checked the hoses and the connector. All are fine. I'm still having the same problem. It is still running pig rich, I have unburnt fuel (white fuel smelling vapor) coming out of my exhaust. It's almost as if I'm dying cause it's too rich and the only way I get enough air to burn the excess fuel is to keep her above 3k. Help please. thanks

 

Help anyone? I need to drive my car

 

Since you removed and replaced the fuel injectors, perhaps one or more of them may be leaking fuel into the rotor housing. Did you remove the primary fuel rail? If so, did you make sure the "plastic" spacer was in place between the mounting tab and the engine when you reinstalled the rail?

BTW, white smoke sometimes indicates a coolant seal problem. Does the smoke smell sweet?

 

No, the injectors stayed in along with the primary fuel rail. All I did was remove the elecrical connectors to the secondary injectors. I followed the procedure in the FSM for removing the "dynamic chamber" and throttle body. AS for the smoke, it does not have theat sickly sweet smell that makes you want to gag. It smells like fule except it doesn't make my eyes burn and it also smells bitter. It almost smells like dirt bike or go kart exhaust. I tried mesing around w/ some of the connectors and all of them (when they were disconnected) made the problem much worse except for the connector right by the rad filler neck. It goes from the TB to the harness and it is a two wire connector. When I disconnected it and started my car, the same thing happened except I couldn't keep it alive at all. I reconnected it and started the car; the car revved up and had to be kept above 3k to statyy alice. thanks for the help

 

Update: I tried disconnecting the secondary injectors to see if somehow they were being triggered but nothing changed. Also tried the BAC conncetor and all the other connectors as well as double checking my vac lines against the diagram. Everything checks out. Should I take out my AFM and see i the flapper got stuck or something? Thanks

 

This still sounds like a leak of un-metered air, meaning air that is entering the system and bypassing the AFM. Did you use a new gasket and sealant when reinstalling the upper intake manifold and TB?

Since it ran fine before you did the work, ya gotta suspect something you did or didn't do is causing the problem. Recheck everything including the method you used to install the PD (I assume this is an S4?) and any vac or air lines you removed or may have damaged or disconnected during the work. Best I can do right now. Maybe someone else has some other suggestions.