bchncamaro

I have a 94z LT1 w/ a 383 stroker kit. The car starts fine when it's cool, but if I get it up to temperature, shut it off and try to start it again it turns over very hard. It almost acts like an older car when the timing is too high. My guess is either the opti or the starter. Any ideas. Thanks.

pyronotic138

iTrader: (1)

my car does the same thing and yet to find out why. 97 WS6. if its 20 degrees out it will start right up. but if it is hot out or i turned the car off and let it set for 20 mins it cranks and cranks and cranks and finally starts. also i think that has something to do with the reason i get about 8mpg about 12 on the highway.

snk-huntr

iTrader: (2)

this may sound weird but back in the spring i took my battery out to paint my battery box and when i put it back in it done the same thing your talking about so i unhooked the battery again for 30 seconds and hooked it back up and it stopped maybe computer related who knows cant hurt to try and good luck!

infinitebird

iTrader: (11)

Sounds like maybe your o2 sensors.

98pontiacfirehawk

Sounds like bad battery cables cause when they are warm the cables create more resistance or a loose connection. Thats where I would start.

roadtrip120

iTrader: (29)

Its the ICM, happens a lot with lt1's.

sweet-94z28

iTrader: (30)

My bet is ICM

tspence45

iTrader: (30)

Mine does the exact opposite. When it's warm, it starts easily. When it's cold, it's a bitch to start.

LT1Falcon

iTrader: (3)

by "turns over very hard" i take it you mean it cranks slowly? or do you mean it cranks a lot off times before it starts? mine used to crank fast when it was cold and slow when it was hot. i have since replaced the starter but have only ran it once for about 5 minutes so i cant give you feedback on whether it helped the warm starts or not

LT1Falcon

iTrader: (3)

and definitly not 02 sensors. they only effect anything when the motor is in closed loop mode, which isnt when you are trying to start the motor.

Bad_tx_Z28

iTrader: (3)

same prob here, except for sometimes the starter just clicks and nothing....i have to bumb the key like 5 times before it starts...i know its not the batter because its a brand new optima yellow top, also starter is about 4 months old.

lt170chevelle

iTrader: (2)

wow thats crazy..i have the same problem with mine i dont know what is causing mine. mine just turns over slow when warm. mine acts like the battery is low but never checks to be.

BOLO

iTrader: (40)

Check fuel pressure, fuel pump, fuel pump relay if it's not ignition related.

infinitebird

iTrader: (11)

Sorry but you are wrong. A bad o2 sensor can most certainly effect warm start. When you start warm you are in closed loop basically immediately, and if it was running very rich/lean before you shut it off that can affect startup. They would not affect cold start. Plus the person I responded to said he was getting really bad gas mileage, which is one of the symptoms of bad o2 sensors.

It could be a heat soak issue though (like with the icm).

Kaoz

Not sure on the answer but put another one up for the problem. I can bump my key for like 2-3 minutes sometimes like the batteries dead but then all the sudden it will start up like a champ. Only thing i can say is that its only since started when i put a cut out on.........not sure if its coincidental or that it may have thrown O2 sensors...and its only when warm. New opti...new battery....and cars only got 50k mi so its gotta be somethin real stupid....

lt170chevelle

iTrader: (2)

yeah the oxygen sensors do actually sound like a good assumption. i will try that on mine .

Nole Chick

Any update on this? Same thing started for me yesterday, gonna check the ICM/coil since I get noise through my speakers like the old "condensor noise" from days long ago.

djjab57

iTrader: (17)

This Happen Too Me Twice, It Turned Out To Be My Ignition Switch Mounted On Top Of The Steering Coloum. The More You Drive The Hotter It Gets Have Too Drop Steering Col. Down And There Is Two Very Small Screws Holding It In. First Just Unplug The Connecters And See If There Is Any Burn Marks But They Will Not Always Looked Burnt, My First Time It Was Clean But Was Still Bad Hope This Helps Hey KAOZ Thats What I Though At First My Battery Was Dead Deff. Ignition Switch

355z28

iTrader: (8)

This has nothing to do with o2 sensors, when its real cold it starts right up and when its hot it turns over and over and over, and gets bad gas milage...

GUARANTEE you its the tempature sender on the water pump. That sensor goes to the computer not the guage and when its bad it automatically defaults a -20 to -30 below causing it to run extremely rich hurting your milage, and when its hot its drowning itself with fuel not being able to start.

the other tempature sender on the side of the head is the one that runs your guage.

hope this helps you guys out.

Kitt_Down_Under

Thank you thank you thank you! Couldn't figure this out to save my life!

I replaced this temperature sensor (just got a replacement acdelco one off Amazon) and now it starts perfectly every time. Still waiting to see what my new and improved fuel economy is like!

Thanks so much!