How can increase my idle speed?

yellowfever#154

yellowfever#154

Full Access Member
Joined
Dec 14, 2007
Messages
3,258
Reaction score
2
Location
Lacombe, Alberta
Do I need to use a tuner or is there something I can do manually to increase the idle? Does rotating the tps have any affect on this? The idle speed is now 750 but with the cam its too low, I need to get it up around 1100 or so.
 
On my bbk there is an idle screw to adjust if needed not sure if the stocker has it. I am sure you could drill and tap in a screw if it does not
 
yellowfever#154 said:
Do I need to use a tuner or is there something I can do manually to increase the idle? Does rotating the tps have any affect on this? The idle speed is now 750 but with the cam its too low, I need to get it up around 1100 or so.
Click to expand...

Go and get yourself the proper screw/bit for turning the base idle screw in a bit. They are sold as "tamper-proof" bits and are the same that are used for car stereos and such. Yes, your tune may need a tweak but I'd try the base idle screw first.
 
Last edited:
I have tried that once before on Joes truck, we adjusted the screw (one that adjusts the butterfly). What I found was it would increase the idle, but then after some idling the truck would then decrease the idle on its own. Almost like that it learnt the new position of the butterfly and then reset itself. I can try it later tonight and see what happens on my truck.
 
rottenronnie said:
Go and get yourself the proper screw/bit for turning the base idle screw in a bit. They are sold as "tamper-proof" bits and are the same that are used for car stereos and such. Yes, your tune may need a tweak but I'd try the base idle screw first.
Click to expand...

Good info, I have a set of tamper proofs in my box.
 
if you try to adjust the idle screw, the computer will simply close the idle air control valve a little more to bring the idle back down. I'm quite sure a tuner can increase the idle speed, but if that is not an option you will hae to remove the idle ari control solenoid, block off the passage that lets air bypass the throttle plate, and then adjust the idle manually. However, this will cause the idle to change on it;s own relative to atmospheric conditions.
 
^^ He's right! It is in the tune and you should still be able to idle at 750, as I believe all QCs and RCs are preset at, but the idle airflow table in the tune need to be tweaked as more air is entering at a given Map pressure and fueling is off. This affects idle A/F ratio as well usually leaving you with eye tearing richness at idle. What tune do you have for this cam? I feel " mail order" tunes as I call them are simply a guesstimate and rarely accurate as each motor, combination, and most importantly the customer's altitude and average weather greatly contribute to a tunes drivability. It needs what I call a street tune! A tune where the tuner logs data under normal driving including idle, part throttle accel, cruise, and WOT conditions. He then bases the tune around what is logged. ( A/F at different RPMs as well as knock retard and various other important details for a proper tune. Why I wish I could get my own software for the Dodges like I have for Fords and GMs.:burnout:
 
Currently at this time I am suing the factory tune. I have removed the Vec completely and it has been sold. What my plans for the future was to use the factory tune to get a few miles on the truck, then swap to a SCT and get a dyno tune done. Then again later when I put the Procharger on I would swap to the Pectal.
 
AWDisuzu said:
if you try to adjust the idle screw, the computer will simply close the idle air control valve a little more to bring the idle back down. I'm quite sure a tuner can increase the idle speed, but if that is not an option you will hae to remove the idle ari control solenoid, block off the passage that lets air bypass the throttle plate, and then adjust the idle manually. However, this will cause the idle to change on it;s own relative to atmospheric conditions.
Click to expand...

This sounds interesting and maybe something I will try. Where is the IAC passage on these engines? Is the beginning of the passage the barb on the passenger side of the intake near the throttle body? The one that we connect a hose from the intake then to the CAI pipe? If it is then can I just take a cap and plug off the hose barb at the intake manifold?
 
yellowfever#154 said:
This sounds interesting and maybe something I will try. Where is the IAC passage on these engines? Is the beginning of the passage the barb on the passenger side of the intake near the throttle body? The one that we connect a hose from the intake then to the CAI pipe? If it is then can I just take a cap and plug off the hose barb at the intake manifold?
Click to expand...

Sorry, I didn't read the 1100 r.p.m. idle goal. :eek:
In that case, the curb idle screw won't cut it because the IAC will try to compensate. Some ecus will even retard timing in an effort to slow the engines down. That cam must be raunchy!
It can be tweaked in the software to get it where you need it to idle. Toma (Calgary) can help you out..

PM me if you need more info.

Ronnie
 
I removed the hose from the intake to CAI for the IAC passage. I then plugged both off, turned in the idle screw a number of turns and I was able to manually adjust the idle. It worked perfectly just like on a carb engine.
 
yellowfever#154 said:
I removed the hose from the intake to CAI for the IAC passage. I then plugged both off, turned in the idle screw a number of turns and I was able to manually adjust the idle. It worked perfectly just like on a carb engine.
Click to expand...

Kewl.I never tried it by taking anything off! Is that the hose under the MAP sensor then?:dontknow:

Did you get your front end fixed today?
 
The hose that comes off the front rh side of the intake. I think on yours you have a hose with a little K&N filter on it.

The alignment is perfect. The adjusted the rear axle as it had a slight thrust angle to the right and they got the front end perfect.
 
rottenronnie said:
Sorry, I didn't read the 1100 r.p.m. idle goal. :eek:
In that case, the curb idle screw won't cut it because the IAC will try to compensate. Some ecus will even retard timing in an effort to slow the engines down. That cam must be raunchy!
It can be tweaked in the software to get it where you need it to idle. Toma (Calgary) can help you out..

PM me if you need more info.

Ronnie
Click to expand...

Ronnie,

I will for sure be in contact with you about tuning. I would like to put a few break in miles on the truck and then get it tuned.
 
Y'all can't adjust the TPS a bit to idle it up? I know I have done that on my truck before and it brings up the idle a few hundred, and doesn't effect my tune. Just wondering..
 
BLKSVT said:
Y'all can't adjust the TPS a bit to idle it up? I know I have done that on my truck before and it brings up the idle a few hundred, and doesn't effect my tune. Just wondering..
Click to expand...

I didnt try that, I wasnt sure if I would get the 400 RPM I was looking for that way. While tuning I will change it back as I think blocking the line off will actually hurt WOT air flow. The line is 3/4" that basically is extra flow additional to what the throttle body flows. Its amazing how much air at idle is pulled through the line, I had to open the butterfly probably 4 turns to compensate for the air flow loss.
 
You must log in or register to reply here.

Latest posts

Support Us

Become A Supporting Member Today!

Click Here For Details

Random Media

Banner on truck
Monterrey Nov 2011
image
VTR-0015 ScottVA
Back
Top