at start up car idles like its cammed but isnt????? more info inside

[dboy187]

ok guys im back once again, when i start my car warm or cold it flucuates in idle like a womp womp kinda like a cam, but ISN'T then it smooths out, and today car was warm and started it up and it was sucking some MAJOR air and barely running, it then died, and would NOT start up but after like 20 mins, any help? stock besides no cat. im stumped. thanks guys yur always helpful i was thinking icm but doesnt just do it when hot?

 

[ctracer]

vacuum leak is my first instinct. check for that.

 

[dboy187]

ok will do, just the old fashion can of carb cleaner and start spraying, best way i know to check. could any sensors cause this i havent had any codes not even a rear 02 since cat is hollowed,... thanks man

 

[ItHurtz]

throttle body to evap vac line? I pulled mine off one time and it idled like I had a cam. was fun

 

[GTPSHAWTY]

what yea is your car

 

[GTPSHAWTY]

check the little vaccum line under the snout.. i bet it came off

 

[dboy187]

99 gtp

 

[GTPSHAWTY]

check that vaccum line under the snout to the map sensor...

 

[dboy187]

will do in the a.m and then update ya'll
thanks again, also when my boost kicks in if i floor it it seems hesitant, but quarter to half throttle it goes great, autolite 104's gappped at .60 maybe my problem?

 

[Fivefingerdeathpunch]

ANy mods?

If you are running 104's without mods, those are WAY too cold. Run stocks plugs or AL 606's

 

[dboy187]

ahh ok i misread the info on the cooler plugs oops ok will def get oe plugs, secnd job at advance sure pays off lol, only mod to car is smaller pully i do not know what size was put on by original owner so no info there. thanks ffdp, and i dont know if u was u that was wanting roof rails or not but if it was i havent made it there yet.

 

[Fivefingerdeathpunch]

Id go measure the pulley.

That could be a reason for the hesitation, you get inital boost and then when it figures out its more than it can handle is retards tons of timing so it dont ping itself to death.

Id try and get a stock pulley back on that thing, so you dont hurt it.

No rush on going to the yard, you can just PM me if you have luck when you do go.

 

[dboy187]

ohhh i c im still new to these cars will try to do asap

 

[ItHurtz]

ya get rid of that pulley and stop flooring it unless you want a new engine

 

[dboy187]

stop flooring it? lol i baby it too many miles to abuse her

 

[SlowNA06]

Need to scan it.
Pay attention to EGR percent.
Check to make sure the mass airflow sensor (MAF) is clean and plugged in.

 

[dboy187]

whats a good egr percent maf just clean awhile ago im going to try the plugs first

 

[Fivefingerdeathpunch]

egr at idle should be 100% off

 

[SlowNA06]

whats a good egr percent

egr at idle should be 100% off

EGR% at idle should be 0%. 0% = closed. Anything more is a vacuum leak. It should only be open at cruise... like somewhere around 25% throttle. The more it's open, the more your engine will sound like a funny car at idle or low rpms.

 

[Fivefingerdeathpunch]

What I said is still right, I just said it backwards, 100% off is still 0% open, not meaning to confuse, hopefully people are smart enough to understand.