BlueSprite

Recently, i remove the cold start system, and the car idle is very rough at the begining ?? (i believe it is normal since it had no cold start sys.) later on the idle is going up and down around 850 - 1200, once the car done with warm up the idle stay around 800-850.

In some reason, the car is hard to start when hot too. it needs to crack for 5-6 sec. BTW: it has a lot of gas smell too, i know is running too rich; can i use wideband and PFC to reduce it ??

BTW, the car cant run properly under 3000rpm, but once the idle hit 3k or up it is fine. Is it any method to reduce the noise from the exhaust ? (i have T78, race port, DP, MP, and stock exhuast [still loud once it hit 3k])

thx Sindy

BlueSprite

anyone ^^^^^

BlueSprite

anyone plz~~~

CantGoStraight

With a T-78, DP and MP it's going to be loud evven with the stock cat back. Should be bearable though. Not sure what to tell you other than try adjusting the adjustment screw on the TB under the Elbow and see if that will help level it out.

DaveW

Leaky injectors can cause rich running (in extreme cases, flooding and non-starts) at startup.

rynberg

Your post above seems to imply that you are running a large ported motor with a T-78 on the stock ecu or an untuned PFC.

I would guess that your engine is probably on the way out, given your symptoms of hard hot starting, rough idle, and poor low-end power.

Trahan

I'm natively speaking french so I'll do by best for you to understand me. I have had the same problem on my Impreza. It surely is one of these 3 problems : either the catalyst ( there is restriction )... you should simply take it off.. you dont need one if your under 1995. Then, i'd check the mass air flow ( air flow meter ) and the oxygen sensor. It must be one of those things. Restriction always cause starting and idle problems.

alberto_mg

Trahan - stick to Imprezas. The FD is totally different and none of the above is applicable.

saxyman990

Ho boy, where to start?

First of all, he lives in California. It's not as simple as "removing the cat," because he still needs it for emissions (US emissions standards started in the late 70s. All cars after that are required to have one). Second, we don't have mass air flow meters on FDs. They are a speed-density system (not MAF). Please don't give advice for FD owners based on Impreza experiences. It really doesn't work that well.

-Rob

CantGoStraight

I'm not sure why you guys are telling him to remove the main cat ???? he's running a DP, and MP with the stock catback.? ? ? ?

saxyman990

I wasn't (althought, I didn't really read his initial post). I was correcting mis-information from the canadian Impreza dude.

-Rob

birdy01

lol

CantGoStraight

That's my point obviously he didn't read the post other wise he woulfn't have posted what he did.....then again maybe he would have, after all he drives an Imprezza ! ! ! ! LOL

saxyman990

I think the fact that he stated "I'd check the mass air flow meter" pretty much speaks for itself. hehe

-Rob

BlueSprite

The engine has those kind of symptoms, but i just had an engine rebuilt. I m thinking will that cause by the injectors, maybe !? For sure, i have an untuned PFC. BTW, when i start up the car when cold, it starts up fine w/o any problem.

I m thinking should i go buy a wideband with o2 to get it tune first !? Or put back the Stock ECU to drive in break-in period ??

thx

BlueSprite

Thx i understand what you said, but i believe it is different than Impreza.
I remove the cat, i have T78 (no AFM), the O2 is fine working. And i m thinking about the fuel injectors, putting too much fuel. i guess!?? i just have to do adjustment on PFC, but i m thinking about to do in dyno shop but the car is in break-in period now....

rynberg

Who rebuilt the engine for you? Who installed it? Do you have bored-out or aftermarket injectors? Upgraded fuel system? Your symptoms could also be caused by a bad FPR or FPR solenoid or very badly leaking/poorly installed injectors.

The PFC doesn't use the AWS system on cold starts so that is not your cold-start problem.

No offense, but it sounds like you've gotten in over your head going single turbo and you are not doing things properly!

BlueSprite

Yes, the things that i did is not properly, and now i m trying to fix it up.
Well, i was thinking the FPR and the injectors, but i remember i did a flow test on those before install it back to the car..... Since you brought this up, is it possible i can check on the fuel injectors is leaking or not ??

Just remind you guys, i have running 550/1300 with stock FPR; and it is dumping to much fuel

BlueSprite

how can i check the injectors is working properly ??

and how can i chekc the FPR solenoid , and where is the FPR solenoid at ??


thx

BlueSprite

anyone .......

bump^^^