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#1
12-18-2009, 11:20 PM
Hummer Authority
Join Date: Sep 2003
Location: Canada
Posts: 1,251
Re: Hard Start only when warm H2 2003
Could be a bad ect sensor. If its reading -40c(default temp) and your starting it warm the pcm will see that its cold and demand more fuel causing a hard start. Get them to check scan data and look for abnormal sensor readings.
__________________
1987 Jeep YJ 403hp sbc 653hp on NOS
1998 Chev Z71
2007 Chev Trailblazer SS
#2
04-05-2010, 04:51 PM
Elcova Rookie
Join Date: Dec 2009
Posts: 5
Re: Hard Start only when warm H2 2003
Quote:
Originally Posted by HUMTECH
Could be a bad ect sensor. If its reading -40c(default temp) and your starting it warm the pcm will see that its cold and demand more fuel causing a hard start. Get them to check scan data and look for abnormal sensor readings.
I will replace the ect sensor.
Do you know where I can purchase dummy 02 sensor plugs? When I emptied my cats check engine light obviously stays on?
#3
04-06-2010, 12:17 AM
Hummer Authority
Join Date: Sep 2003
Location: Canada
Posts: 1,251
Re: Hard Start only when warm H2 2003
Try Casper Electronics, i got a set of cheaters from thm for my 98 z71. About the same price as o2 sensrs and never had a problem with them
__________________
1987 Jeep YJ 403hp sbc 653hp on NOS
1998 Chev Z71
2007 Chev Trailblazer SS
#4
04-07-2010, 01:06 AM
Elcova Rookie
Join Date: Dec 2009
Posts: 5
Re: Hard Start only when warm H2 2003
Quote:
Originally Posted by Ulrich1
I will replace the ect sensor.
Do you know where I can purchase dummy 02 sensor plugs? When I emptied my cats check engine light obviously stays on?
Changed ECT sensor today-No change in starting problem.
#5
04-07-2010, 02:07 PM
Hummer Expert
Join Date: Sep 2007
Location: Mason, OH
Posts: 779
Re: Hard Start only when warm H2 2003
What codes are you getting, how many miles do you have? When was the last tune up you did?
#6
04-08-2010, 12:46 AM
Hummer Authority
Join Date: Sep 2003
Location: Canada
Posts: 1,251
Re: Hard Start only when warm H2 2003
Agreed, need to get some scan data, codes set? bad cam sensor can cause extended crank, low fuel pressure, too much to diagnose blind. Cheaper for an hour diagnosis time than replacing parts at random
__________________
1987 Jeep YJ 403hp sbc 653hp on NOS
1998 Chev Z71
2007 Chev Trailblazer SS
#7
11-08-2013, 11:25 PM
Hummer Novice
Join Date: Mar 2009
Posts: 18
Re: Hard Start only when warm H2 2003
Same problem here. If i turn key on / off three times, it seems to start right up telling me it is probably the fuel pressure regulator or fuel pump. Its like charging the entire fuel line every time you start it. More than likely the fuel pressure regulator or leaking injectors as the fuel pump delivers plenty of fuel and power at full throttle cold or warm. I checked the fuel pressure when running and its close to 40 psi. if it sits for a while it drops to nothing. Pressure regulator may not be holding the pressure in the ports or the injectors are stuck open releasing pressure.
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