Idling issues and dieing.
#1
Idling issues and dieing.
After installing the M62 Supercharger I keep having issue with idle and my truck dieing.
Normally this happens when in the drive-thru, atm, or like backing into the garage.
I give it just a little bit of gas to get the truck rolling and then let off and the truck powers itself, as it starts to slow down it dies.
Now I didnt have this issue before, but when I installed the supercharger my IAC was extremely dirty, so I cleaned it with brake cleaner like I have done in the past.
I dont think the IAC does anything while in D or R, only in P and N? Is this correct? I cant remember.
I might just bump my idle up, it idles at about 700 which seems kinda low to me.
maybe something else I should check?
Normally this happens when in the drive-thru, atm, or like backing into the garage.
I give it just a little bit of gas to get the truck rolling and then let off and the truck powers itself, as it starts to slow down it dies.
Now I didnt have this issue before, but when I installed the supercharger my IAC was extremely dirty, so I cleaned it with brake cleaner like I have done in the past.
I dont think the IAC does anything while in D or R, only in P and N? Is this correct? I cant remember.
I might just bump my idle up, it idles at about 700 which seems kinda low to me.
maybe something else I should check?
#2
I'm pretty sure the IAC does work in D and R. Mine is going bad and sometimes when I come to a stop it doesn't open fast enough and the trucks idle drops down really low and it shakes like its going to stall, but it opens before it actually stalls. IMO I don't think raising the idle will fix it, it's not like you've got a set of aggressive cams in the truck. I would buy a new IAC.
#3
#4
#5
The IAC is active all the time, in all gears, even when the engine is running well above idle. The supercharger is a load on the engine at all times but the PCM should be able to learn the new IAC duty cycle for the additional idle load. Still, if the IAC is sticking, it may not be able to recover fast enough after blipping the throttle.
Do you have a way to monitor A/F ratio? Do you have a blowoff or bypass valve? The supercharger may be causing mixture excursions when the throttle snaps shut.
Do you have a way to monitor A/F ratio? Do you have a blowoff or bypass valve? The supercharger may be causing mixture excursions when the throttle snaps shut.
#7
First thing I'd want to know is if the blower by-pass is set right. It needs to be open at no boost. Most likely that's not your issue.. but it needs to be checked so you don't run in circles chasing your tail.
On my eaton 112 it's vacuum operated and is on the drivers rear.
Rich
On my eaton 112 it's vacuum operated and is on the drivers rear.
Rich
The IAC is active all the time, in all gears, even when the engine is running well above idle. The supercharger is a load on the engine at all times but the PCM should be able to learn the new IAC duty cycle for the additional idle load. Still, if the IAC is sticking, it may not be able to recover fast enough after blipping the throttle.
Do you have a way to monitor A/F ratio? Do you have a blowoff or bypass valve? The supercharger may be causing mixture excursions when the throttle snaps shut.
Do you have a way to monitor A/F ratio? Do you have a blowoff or bypass valve? The supercharger may be causing mixture excursions when the throttle snaps shut.
I plan to order an A/F ratio gauge, boost, and fuel pressure. I will order these soon as I didnt think about this causing the issue.
thanks for the ideas guys. I will report what I find once I get some gauges in to help.
#8
At nearly any measure of vacuum this is taking place. As you approach near zero vacuum that valve closes and you start to build boost.
On my eaton I raise the dashpot until the valve lever is not touched. I then lower it until the dashpot is pushed in by 1.5 - 2.0mm (0.060" - 0.080")
From there I raise or lower it to tune how quickly the boost vs throttle position comes on.
Rich
#9
I'm not familiar with your blower. But it should have a by-pass system that internally bleeds boost back to the intake side of the blower.
At nearly any measure of vacuum this is taking place. As you approach near zero vacuum that valve closes and you start to build boost.
On my eaton I raise the dashpot until the valve lever is not touched. I then lower it until the dashpot is pushed in by 1.5 - 2.0mm (0.060" - 0.080")
From there I raise or lower it to tune how quickly the boost vs throttle position comes on.
Rich
At nearly any measure of vacuum this is taking place. As you approach near zero vacuum that valve closes and you start to build boost.
On my eaton I raise the dashpot until the valve lever is not touched. I then lower it until the dashpot is pushed in by 1.5 - 2.0mm (0.060" - 0.080")
From there I raise or lower it to tune how quickly the boost vs throttle position comes on.
Rich
Just to make sure we are talking about the same thing...
Is it this?
#11
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