Hesitation and stumble when cold

[mk3supreme]

Guys I need help when I start up the car after it set for a couple hours or overnight it hesitates so violently it's ridiculous. I thought it was a boost leak but I had a cracked a hose from the throttle body to the intake pipe but I changed it and now I get like 6psi but it still stumbles. Any help would be greatly appreciated .

 

[smagnotta]

Check for error codes - could be your AFM.

Check all hoses and pipes, vaccum lines - maybe a hose came loose or a clamp.

Check everything starting from the turbo to/from the intercooler.

Do you have the Super Monitor? You can check error codes using that very easily.

Is this a stock car? Any mods?

 

[americanjebus]

exhaust clogged???

 

[smagnotta]

Yea it could be your CAT too. Any smells?

 

[IHI-RHC7]

check your thw sensor
AKA coolent temp. It should be the middle conector on the thermostat neck. It sounds like the ecu doesn't know what the engine temp is, so it just defaults to 173 or so, so your car runs weird until it's up to operating temp. At least that's why my car did that...

 

[mk3supreme]

the car is stock . But there is a crack in the hose that goes from the accordian hose to the intake manifold do you think its that

 

[mk3supreme]

Yea it could be your CAT too. Any smells?

You know what I do smell a funky exhaust odor. you think that its it?

 

[Xtreme]

very possible

 

[smagnotta]

the car is stock . But there is a crack in the hose that goes from the accordian hose to the intake manifold do you think its that

I would replace it if it is a big crack. How big is this crack?

Go to a muffler place and tell them to check your exhaust system --- downpipe to pre-CAT to CAT to resonator to muffler.

 

[lagged]

check your timing and do a tune up.

 

[Xtreme]

check coolant temp sensor, and check for a plugged cat, though I think if it runs good when warm, it's probably not the cat...

 

[lagged]

look under the oil cap for water...check PCV lines for oil/water mixing. mysterious coolant loss? pressure test the cooling system.

if it dosnt hold pressure and there are no external leaks.......you have a BHG.