Cold, cold No start... pedal to floor... starts
#1
Junior Member
Thread Starter
Join Date: Dec 2013
Location: Lake George
Posts: 5
Likes: 0
Received 0 Likes
on
0 Posts
Cold, cold No start... pedal to floor... starts
New to me '06 Envoy w/ 4.2. 87k miles. I don't even have plates yet but it was in the way last night at -4 degrees F so I was looking forward to the test. It turned over and lurched a couple times but didn't start after 3-4 attempts. I reluctantly put the pedal to the floor and tried again. Fired right up but idled rough for a couple minutes until it smoothed out and ran fine. This usually isn't the routine with fuel injection but it'* worked for me with other cars. Comments? Thanks, C.
ps I have 3-4 secondary air injection codes present and am working through that.
ps I have 3-4 secondary air injection codes present and am working through that.
#2
Senior Member
True Car Nut
the air injection may cause issues im not how that works on newer vehicles. i do know alot of people have problems with the 4.2'* with carbon build up on the back of the throttle body butterfly, and you have to take it off and clean it real good. drive by wire vehicles dont have separate idle circuits/valves so they are very sensitive to carbon in the tb at idle especially
#4
Junior Member
Thread Starter
Join Date: Dec 2013
Location: Lake George
Posts: 5
Likes: 0
Received 0 Likes
on
0 Posts
jwfb, I will clean the tb as I have seen this mentioned. Racer, does this fuel injection have a "7th" cold start nozzle? I've had cars with a cold start nozzle separate from the cylinder injectors. I will clean first, work through my Air Injection issues and go from there. Thanks, C.
#6
Retired
I'm kinda curious how he got it started to begin with when he had it "floored" while starting. Aren't GM'* programmed to turn OFF the injectors when the PCM see'* 90% or better TPS while cranking? Or what GM calls, "clear flood mode".
__________________
Retired Administrator
2002 *-10 5.7 V8
2023 Jeep Rubicon Diesel
Retired Administrator
2002 *-10 5.7 V8
2023 Jeep Rubicon Diesel
#8
Senior Member
Things that can cause a flooded condition on a fuel injected engine are leaky injectors, ruptured fuel pressure regulator or a bad or shorted engine temp sensor or even a bad mass air flow sensor. It could of been a fluke thing. My wife'* SRX had flooded on me twice in the 5 years we have owned it and it doesn't set any codes when it does it.
#9
Senior Member
True Car Nut
i think its something to do with the dbw throttles because as the carbon builds up the tiny air gap gets blocked, that will be over rich and no air without the iac like the older cars had. and you have to open the throttle some before it will start
Thread
Thread Starter
Forum
Replies
Last Post
asonofabeach69
1992-1999
11
11-03-2005 02:27 PM