My 300 sputters and misses at startup when cold???

turboZX · Jul 14th, 2005, 09:02 PM

ok i have been having this problem on and off for several months now, this mainly happens first in the morning or after work, start the car and it idles a lil rough u go to give it gas and if u go to slow it will just cut out complety and die sometimes, go fast and kinda work it a lil u can easily hold it around 1500-2000 and it runs great, now when u put it in gear and start rolling it will just sputter and miss like crazy u can really hear it with the straight pipe, but! as soon as u give it some boost, it will instantly go away and run strong under hard acceleration, fall back in the cruisin mode with no boost around 0psi it will do it again, it will usally only do this for about 3-4 mins??? can anyone help me out with this one???? thanks

>>i replaced the fuel filter a couple months ago, plugs are fairly new platiums, and ngk wires

Zen31ZR · Jul 15th, 2005, 07:39 AM

Mine did that too. I think it has something to do with one of the air valves on the side of the intake manifold. 3-4 minutes it would go away and run fine. Mine did it all the time, summer or winter.

turboZX · Jul 15th, 2005, 06:54 PM

well at least i know i;m not the only one going nuts, now how do i fix it?? man it really ticks me off!!!!

does urs still do it or has it stopped

BoBakTXL · Jul 15th, 2005, 07:44 PM

Quote:

Originally Posted by turboZX

well at least i know i;m not the only one going nuts, now how do i fix it?? man it really ticks me off!!!!

does urs still do it or has it stopped

MINE does the EXACT same thing.

turboZX · Jul 19th, 2005, 11:54 PM

hello wheres all the hardcore 300 experts, i figured someone might have an idea for the cause of this mabey

MaxQ · Jul 20th, 2005, 12:24 AM

Check your ECU codes first.

Zen31ZR · Jul 20th, 2005, 03:14 AM

Quote:

Originally Posted by turboZX

hello wheres all the hardcore 300 experts, i figured someone might have an idea for the cause of this mabey

It's not that big a deal. 3-4 minutes, it's gone. It's the age of the car and the components involved... We use our expertise on serious problems, or modifications. This is not a serious problem.

asleepz · Jul 20th, 2005, 09:58 AM

Check your IAC valve.

turboZX · Jul 20th, 2005, 11:52 PM

Quote:

Originally Posted by asleepz

Check your IAC valve.

srry man but what and where is the IAC

and i do need to run a dianostic check on it, i have acess to all that good stuff

asleepz · Jul 21st, 2005, 12:18 AM

Idle Air Control valve... Driver side middle of the intake manifold..

RocketRodent · Jul 28th, 2005, 11:56 PM

Also got a similar issue out of the Air Regulator Valve on the Passenger Side of the intake. You'd notice a high idle along with the crap starts with this being fubar'd.

Zen31ZR · Jul 29th, 2005, 08:56 AM

Quote:

Originally Posted by turboZX

srry man but what and where is the IAC

and i do need to run a dianostic check on it, i have acess to all that good stuff

I don't think it'll show up on a diagnostic. The ECU diagnostic functions were extremely basic back then, since these cars are pre OBD-1.

chillow · Sep 3rd, 2005, 12:21 PM

Quote:

Originally Posted by RocketRodent

Also got a similar issue out of the Air Regulator Valve on the Passenger Side of the intake. You'd notice a high idle along with the crap starts with this being fubar'd.

ok so i was searching and reding about rough idle in the morning, what this guy said up here is happining to me right now, horrible morning start and high idle. i just got my car back from the shop MAF replaced along with eng. temp sensor. and all other tune ups( fuel and air filter, plugs, wires, cap, and rotor, FPR, oxygen sensor),
can anyone elaberate a little on the air regulator valve?

dono200sx · Sep 3rd, 2005, 08:48 PM

Quote:

Originally Posted by asleepz

Check your IAC valve.

I've had this suggested before. Seems logical enough. What exactly are we looking for on it? Carbon-buildup? Could you elaborate on this a little, please? Much thanks!!