Having problem cold start up
#1
Having problem cold start up
I have a 99 Saleen with a vortech supercharger. On cold start up after sitting the car has rough idle and dies and blows puff of smoke. Try starting up again and it runs fine. Pulled the plugs and they look great. Did a compression check and around 175 psi all around. Cant figure out the problem any help would be thankful. Car has 104,000 miles on it. But runs strong when after warm up. THANKS Please Help.
#3
3rd Gear Member
Join Date: Mar 2007
Location: Where gunshots are more common than birds chirping
Posts: 504
RE: Having problem cold start up
My car does the same with the P1SC. I'm convinced it has to do with the fuel map being changed by the PCM to compensate for a cold start up, which throws the whole thing off. In my case it makes it run rich, so I have to start with the pedal to the floor to shut off the injectors for a second.
#4
5th Gear Member
Join Date: Dec 2004
Location: In between Your Mom's Titties, skeet skeet..
Posts: 2,045
RE: Having problem cold start up
Could be a few things.. Does it throw a code when it stalls out?? To name a few: Sticky IAC, bad coolant temp sensor,faulty FPR etc...
If it's throwing codes, see if you can find out what it is... I know it may not be easy to replicate the problem by the time you get scan tool, but it's worth it's weight in gold if you can...
JT
If it's throwing codes, see if you can find out what it is... I know it may not be easy to replicate the problem by the time you get scan tool, but it's worth it's weight in gold if you can...
JT
#5
RE: Having problem cold start up
Check the thermostat also. If the thermostat is broken or set to a low temp (on the upper range)it could be trying to cool the engine by running coolant it on start up. The coolant should not be running into the engine block when it is cold. In doing this it doesn't allow the engine to get to operating temperature right off the start so you have to juice it to keep it going.
Jag
Jag
#6
RE: Having problem cold start up
yeah i had a problem w/ my old car because of the thermostat cutting in way too soon...winter starts/warm upswere a bitch. the guy who tuned my car just changed it when i did a retune. problem solved. my car didnt act like yours tho. not sure if thats because of the blower or not(mine was n/a)
#7
3rd Gear Member
Join Date: Mar 2007
Location: Where gunshots are more common than birds chirping
Posts: 504
RE: Having problem cold start up
I really think it is the blower. The MAF counts, since the cold air has alot more "mass", go up and then the car squirts way too much fuel. Once the blower and motor warm up the MAF counts go back to normal.
#8
RE: Having problem cold start up
even tho i dont have a blower, i am currently having a very similar issue. i pulled the code, P0340, which was something like camshaft positioning timing sensor circuit.. i forget what it exactly called out.. but what it came down to was a new alternator. i went ahead and bout me a nice 200 amp alternator that i will be installing this weekend and then all should be fine. incase you were wondering, i have a very powerful JL sound system in the trunk so it was inevitable. hopefully this helps you out.
#9
5th Gear Member
Join Date: Dec 2004
Location: In between Your Mom's Titties, skeet skeet..
Posts: 2,045
RE: Having problem cold start up
ORIGINAL: 35thAnni99GT
I really think it is the blower. The MAF counts, since the cold air has alot more "mass", go up and then the car squirts way too much fuel. Once the blower and motor warm up the MAF counts go back to normal.
I really think it is the blower. The MAF counts, since the cold air has alot more "mass", go up and then the car squirts way too much fuel. Once the blower and motor warm up the MAF counts go back to normal.
Maybe I'm not reading it right.. I see the mention of the CPS.. This could be something to look at, but if this is something that appears to be common with blowers, I'd concede my comments, and look for other reasons why the engine isn't liking the cold starts..
EDIT: After re-reading it.. How long does it idle before it dies?? Is it any substantial amount of time (more than a minute or 2)?? Also, from what I've seen here, CPS failures usually result in a "No-Start," condition versus a rough start..
JT