Idle Issue

***907DAVE*** · #1 Fri, March 12th, 2010, 12:10 PM

I have had a recent problem with my idle speed.

Idles fine normally and when I let it sit and idle for awhile it will roll up to a fast idle (normal). The problem I have is when I press the brake the idle will drop a few hundred RPM (from 1100 to +/- 950), then run rough and not completely return to base idle( I think it is set at 750). It WILL not return to base idle until I drop it into gear, or switch programs. Sometimes it will do this after a drive and I throw it into park, idle speed will jump up and run rough.

It only seems to do this in a certain program and not in the rest, I have compared programs to see if I could find the issue, but no luck.

Any thoughts?

***cleatus12r*** · #2 Fri, March 12th, 2010, 05:52 PM

Which one does it and which ones don't?

***907DAVE*** · #3 Fri, March 12th, 2010, 06:25 PM

It does it in 200dd, and doesn't do it in the rest........well I don't know about the hot files, haven't tried any of those yet.

***cleatus12r*** · #4 Fri, March 12th, 2010, 10:26 PM

Three things Dave....

Min ICP (IPR) duty cycle at the top of "parameters".

Base PW map in the low ICP/MFD area (WOW, BIG DIFFERENCE)

IPR Duty cycle map in the low ICP ranges.

***907DAVE*** · #5 Fri, March 12th, 2010, 10:37 PM

I see what you mean about the Base PW map, but don't quite understand the ICP duty cycle map/ min. parameter issue.

Can you please explain.

***907DAVE*** · #6 Fri, March 12th, 2010, 10:38 PM

And why only when coming down off of a fast idle?

soutthpaw · #7 Sat, March 13th, 2010, 09:20 AM

did I miss something? where do I get a 200HP DD

***cleatus12r*** · #8 Sat, March 13th, 2010, 09:53 AM

Quote:

Originally Posted by 907dave

I see what you mean about the Base PW map, but don't quite understand the ICP duty cycle map/ min. parameter issue.

Can you please explain.

Well, I don't know for sure.....

But the IPR map is going to at least cause a couple issues. I can't say for sure WHAT will happen with the values you have there but remember how that map needs to be changed just a little bit even with an Adrenaline pump sometimes....

Heck, if you look at the tune I sent you (the one seems to have had an issue with breaking things

) look at the IPR duty cycle near idle......it causes things like near-stalls when coming back down to an idle and a slow recovery back to the correct idle speed.

I don't remember what pump you're using for your HPO, but having a "hard" (parameter set) MINIMUM duty cycle of >9% and commanding a minimum of <11% in the IPR map is very high (for big oil). You are holding a lot of HPO back (not draining). For comparison, your 400DD uses the stock IPR map which must work very well and is bypassing plenty of oil.

You are also running around TWICE the base commanded pulse width in the 200 vs. the 400 in the "idle range". I don't know what the 200 and 400 denote, but if you're using both of those tunes with the same injectors, there are going to be issues.

These are just the differences I saw and the issues that may come of them.

***cleatus12r*** · #9 Sat, March 13th, 2010, 09:55 AM

Quote:

Originally Posted by soutthpaw

did I miss something? where do I get a 200HP DD

Once you get injectors and compounds like Dave has.......

soutthpaw · #10 Sat, March 13th, 2010, 10:43 AM

Heh, would have to change those lil' thingies in his Avatar pic first... Hoping to do an Adrenaline this summer, Injectors down the road but prob just single shots