jimmydanny

New day, new problem. I got something that is forcing my engine to not work. Can't start it with the starter, it sounds like it wanna start, but then it just gives up. I filled 15liters of fuel on it, but might it be condensation from 3 months of not being used that is making the fuel not ignite as it is supposed to? I will try some injector cleaner in the fuel as well with some more 98 octane to beef it up a bit.

Also, when I try to pull it with another car, the engine runs in second gear (or all gears, but second is what I used), and I even accelerate when I give it a little bit throttle.

BUT, when I floor it or release it, the engine hesitates and even slows down the pulling car, thats how hard it hesitates.

Can a huge vac leak do this, and where could a so big vac leak be?

Can this problem be caused by the TPS malfunctioning, or the AFM?

Also, on the intake elbow, straight before the throttle body, there is a sensor, what is this for, and what wire goes where? Is this important to get the car started?

jimmydanny

Sorry, it is kinda urgent for me, going on vacation on tuesday, so I need my car running by then :/

I got spark, I got fuel, I got air, the sparkplugs are very oily and there is alot of gas on them. Bad plugs, bad timing, or vac leak? I got compression for sure.

blk87Turbo2

iTrader: (23)

The sensor in the intake elbow is the Intake Air Temp sensor.

What work have you done on the car recently (before you had problems starting it)?

jimmydanny

Rebuild. I have compression, four working sparkplugs and coils, I have gas, I have oil injectors too for that sake, I have air coming in. But I do not have fire somehow.

blk87Turbo2

iTrader: (23)

Timing is pretty easy to reset...line the leading mark on the pulley up, then pull the CAS and make sure the marks on the CAS are lined up.

Could be a vacuum leak...maybe the brake booster hose (that's a big one). Do you still have emissions installed?

LunchboxCritter

iTrader: (9)

Is your AFM plugged in?

jimmydanny

AFM plugged in, everything is plugged in, I checked it. A vac leak this big would mean something like the brake booster, but there is no obvious vac leak there, all hoses connected.

Also, I checked the charcoal canister vac line, the emissions solenoid lines (all the rats nest lines really), nothing that leaks.

All I know is that I got good compression, spark, fuel, and air. But if it doesnt measure all the air, or no air at all, that can be the explanation, along with alot of other things.

Weird thing is it stalls harder the more throttle I give when I am towed. That dazzles me, there is no logic to that one, except TPS, but that one shouldn't die when it isn't used, and it should still start when I give no throttle.

jimmydanny

Okay, I had a vac leak in the IC, but still got irregular and too little vacuum.

The car did however start when using start gas (spray thing u use), but only idled for some seconds. It even started without the intake on, sprayed straight into the intake elbow before the throttle body.

There are two places that can make a leak so big: the plastic pipe from the turbo to the IC, and the one from the AFM to the turbo. That is the only place I can lose 0,6 vacuum (got 0,2-0,4 irregular, should be 0,6-0,8)

blk87Turbo2

iTrader: (23)

Check the little hose that goes from the BAC to the charge pipe. Also check the two hoses that go from the IC to the UIM.

jimmydanny

No hoses in the IC, except the two 2" ones you cant miss ofc.

Sorry forgot to mention it is an engine swap, I got S5 TII engine, not S4!

BAC is removed along with the rest of the emissions (wanna clean out the rats nest, but the turbo oil pipe is a part of it, would be too stressful one day before vacation lol :P

I took apart the throttle body and elbow, and but loads of RTV silicone in there, if there is a leak there, it will be gone now. But the gasket on the elbow was a bit.. flat? Might this be a problem? I got loads of RTV there now, so no leak if there was any.