Hey guys,
One of the issues I am seeing is when engine is completely warm and I put it in park, it wants to idle at around 1300 rpm. I have done the IAC idle reset procedure several times and my TPS is at .54. Is there any bin paramters that would have an affect on this park idle speed when warm. It idles fine when cold. I tried changing "IAC Park Position" to 0 but it didn't seem to have any affect.
Thanks!
Scott R.
86 Jeep Grand Wagoneer
Stock AMC360 with HEI
There's three ways to do things, the right way, the wrong way and the way that I do it.
- Robert De Niro (Casino)
what mask and ecm are you using again? what are your IAC counts when it idles high? are there any vac leaks? have you knocked the plug out of the front of the tb and adjusted the throttle blade position?
87 4Runner, 15" spring lift, 3" body, chevy vortec 355, 5.29 gears, 38.5x15.5x15" Boggers, 280hr, 16168625 running $0D
93 S10, 36x12.5x15 TSL's, custom turbo headers, 266HR cam, p&p vortec heads, $0D Marine MPFI with 8psi boost.
05 Silverado, 2' lift, 4" exhaust, Bully Dog programmer,
Sorry, I should have given more detail.
Originally Posted by PJG1173
86 Jeep Grand Wagoneer
Stock AMC360 with HEI
There's three ways to do things, the right way, the wrong way and the way that I do it.
- Robert De Niro (Casino)
it almost sounds like the ECM is purposely commanding that high of an idle speed.
don't suppose $42 outputs the commanded idle speed in the datastream, or at least someone knows the RAM location of it?
1995 Chevrolet Monte Carlo LS 3100 + 4T60E
51 IAC counts is a little high but should work. It also indicates IAC is controlling idle and not a vacuum leak controlling idle. But a vacuum leak realy messes up MAP reading and adds fuel and messes up O2 reading and well vacuum leaks are not good.
Change all IAC paremeters back to stock for now.
When you do the IAC reset and IAC is all the way closed you pull IAC plug and set idle to 100 below commanded Closed Loop Idle if your bin is a closed loop idle bin and motor is well warmed up and in CL. Look for the Idle speed here "IAC - Desired C/L Idle Speed"
Do you have a Park/Neutral switch? Do you have a VSS? Did you clear codes after the reset and after setting timing? Do you have any codes after having no codes and driving around a bit? Is motor stock? If not what is vacuum at idle? Steady reading?
1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
-= =-
Do you have a Park/Neutral switch? Yes
Do you have a VSS? Yes
Did you clear codes after the reset and after setting timing? Yes
Do you have any codes after having no codes and driving around a bit? No
Is motor stock? Stock AMC360
If not what is vacuum at idle? 17
Steady reading? yes
I reset the IAC again, and i noticed that the IAC makes kind of a grinding noise when its reseting, is this normal? Also, I noticed that now my IAC is at 72 at idle.
86 Jeep Grand Wagoneer
Stock AMC360 with HEI
There's three ways to do things, the right way, the wrong way and the way that I do it.
- Robert De Niro (Casino)
Yes the IAC will make noise when it is forced in by crossing A and B on ALDL.
Find the idle in bin for warmed up temp or change to what you want. Leave a little high when cold, let it get higher when hot, but keep the area around idle the same. Now you have say 700 RPM set there. Warm up motor totally and even take for a ride. At idle are you closed loop? Yes, turn off motor, cross A and B turn key on, no start, and IAC will set closed before you can get to it and unplug connector, go back turn key off. Start vehicle and set idle to 600 after it has gone closed loop again, even rev motor up a little and let idle settle in closed loop, there is usually a timer when first started. Turn motor off, plug in IAC, clear codes restart and tell us what happens now. What RPM does idle go to when it enters closed loop? What are IAC counts?
1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
-= =-
17 inches of vacuum at idle on stock motor? What elevation do you live?
1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
-= =-
LOL!
That's good vac for being 5,000 above sea level! :D
Familiar with 1227747 and 16197427 PCMs
That does seem weird, IIRC the best vacuum I ever got with the carb setup was 12.5, not sure why its so high.
86 Jeep Grand Wagoneer
Stock AMC360 with HEI
There's three ways to do things, the right way, the wrong way and the way that I do it.
- Robert De Niro (Casino)
How'd you know? I don't see location for him but yes 17 would be fantastic at 5,000 feet.
1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
-= =-
Fixed! :)
86 Jeep Grand Wagoneer
Stock AMC360 with HEI
There's three ways to do things, the right way, the wrong way and the way that I do it.
- Robert De Niro (Casino)
I usually see vac go up when my pcv valve comes unhooked crating a vacuum leak.
87 4Runner, 15" spring lift, 3" body, chevy vortec 355, 5.29 gears, 38.5x15.5x15" Boggers, 280hr, 16168625 running $0D
93 S10, 36x12.5x15 TSL's, custom turbo headers, 266HR cam, p&p vortec heads, $0D Marine MPFI with 8psi boost.
05 Silverado, 2' lift, 4" exhaust, Bully Dog programmer,
Grrrrr, still having high idle issues in park and warm, in O/L or C/L. For some reason it wants to idle between 900 and 1000 rpm, idles a little rough too. I would suspect vacuum as mentioned above, which I checked, but it idles at the correct rpm when in drive. It also idles smooth when the EST is unplugged and I am setting the base timing. I replaced the IAC but that made no difference. IAC is in the 50's at idle.
86 Jeep Grand Wagoneer
Stock AMC360 with HEI
There's three ways to do things, the right way, the wrong way and the way that I do it.
- Robert De Niro (Casino)
what is ALDL mode idle speed set to in the bin? what are you datalogging with, and, is the a 10K resisitor between the aldl pins?
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