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hard start after sitting a while

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roni-wan

15+ Year Contributor
155
1
May 4, 2006
merida, Central America
Hi I´m having some problems when try to start the car.

in the mornings it just fire right up no problems, all the mornings starts just fine but after driving if I park the car for an hour or so it just won´t start easy.

sometimes start but rpms won´t rise like its supposed bogs for a couple seconds then idles fine

most of the times have to crank it for a few seconds until it starts

injectors are brand new pte 680s and work flawlessly on other cars i´ve tested them on other car and won´t cause this starting problems

no leaks on the fuel system and fuel pump its working great, thinking if there were any leaks would have this problems in the mornings cold starts also

car drives and runs really good just having this issue with the start after sitting for a while

maybe the coolant temp sensor its going bad because my max readings are about 186f even disabling the fans temp start rising on the gauge but dsmlink just shows 186f max
been monitoring the temps the only problem seems to be the max reading on the sensor anything below 186f its fine the temp readings climb ok according to the dsmlink

or maybe the isc its going bad but I don´t think so coz Its a new one from dsmisc with just 10k miles
 
could be the temp sensor if the ecu dont know the cold starting temp and hot start temp it could be injecting to much fuel or not enough to keep it running until the system stabilizes itself then idles fine. till you try to restart.
 
check youre coolant temp while the car is cold and make sure thats ok . also i would hook up a fuel pressure gauge to see if youre fuel pressure drops slowly while the vehicle is cooling off or maybe low fuel pressure while youre trying to start the car. could be the fuel pump or the regulator.
 
have fuel pressure gauge and yes it drops slowly but it has done it always with the dsmlink activated the fuel pump today and checked the injertors for leaks but couldn´t find any, also the fuel pressure keeps static while pump its activaded

tomorrow will check the isc to see if that´s the problem

thanks for helping
 
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