Engine wont catch at first

[sy#2921]

Not sure how to explain this best but here it goes.

After hitting the kill switch on the back or starting up the first time after loading a bin on the ostrich the truck doesn't seem to hit on all cylinders at first. It will idle at like 400rpm and the check engine light is on but then it finally catchs all cylinders and runs fine from there on out. It will do it sometime on the first startup of the day but thats rare.

Any ideas where to start?

 

[Daryl H]

Re: Engine wont catch at first

Is it hard to start all of the time?
How about when it is cold?
If it is fine when cold, add 10 points to the 400RPM row on the F29X table.

 

[sy#2921]

Re: Engine wont catch at first

I only really notice it after the master cutoff is thrown or after a new bin is uploaded. In my f29x table the 400rpm range is higher by about 10 points than my idle cells. It also seems to only do this while cold/first startup of the day

 

[WyoSyclone]

Re: Engine wont catch at first

Could be that the limp home portion of the MemCal has a problem.... anytime the battery is disconnected (master cutoff), the truck should start and idle at about 2k for about a minute, then gradually go down to the 1200rpm cold start level, then go down to the normal idle setting.

I'd take the MemCal out of the ECM and carefully clean the pins/contacts (electrical cleaner?). Just uploading a BIN shouldn't do anything, unless you've completely cut power to the ECM.

 

[sy#2921]

Re: Engine wont catch at first

well it did it again this afternoon. I did not change anything yet but I did notice the truck will not respond to throttle input at all while it is doing this.
I left the cutoff switch on and will see what the truck does later with a different memcal

 

[Tooky]

Re: Engine wont catch at first

I thought about this a few weeks ago. It occured to me there seems to be a whole section in the chips for dealing with "battery-disconnected fresh starts". Has anyone out there, ever tuned these sections? I can't imagine there are many people who would go to such great lengths.