| From | Message |
jgreen3d
Gen II
 
6/30/2007
15:54:17
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 Subject: TB/idle issues
IP: Logged
Message:
hey guys I am new to this group and new to dodge trucks. I bought a 97 dakota 5.2 manual recently and Im having a problem with my idle when I pull out of gear at a stop. The idle when I first noticed the problem would to 1200rpm and settle at 600. I cleaned the throttle body, had the computer reset and for two day the truck ran great. Today the problem returned but on the high end it is 1500rpm an the low is in the 750-900 range. The engine has been modified and I dont know exactly what was done. heads, cam, MSD ignition, There is no high flow filter on it which I thought might be part of the problem but Im not sure. Any suggestions? idle air control motor? computer needs reprograming?
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modain
GenIII
7/01/2007
12:44:43
|  RE: TB/idle issues
IP: Logged
Message:
If you didn't remove (very carefully, don't twist it on the way out) the IAC motor to clean it and the air passage you should do this before spending any (more) money to solve it.
The TPS could also be the source of the problem. I hear those are not expensive at AutoZone, Kragen, etc.
What's your left foot doing?
==============
2002 Graphite QC SLT Plus, 4.7L, NV3500, Superchips 3715, 3.92 LSD, R/T rear swaybar, no chrome, loads o'fun...
2001 Patriot Blue Durango SLT, 4.7L, 45RFE, Superchips 3715, 3.55 Open (for now)
1999 Forest Green Dakota RC Sport, 2.5L, NV1500, 3.55 Open
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jgreen3d
GenI
7/01/2007
16:05:26
| RE: TB/idle issues
IP: Logged
Message:
cleaned out IAC motor and passage and problem still exists. Is it possible that the computer needs to be reset again. Ive been told that Dodge vehicles tend to have a memory. Ill try the TPS next. The first time I noticed this problem was directly after a car wash. I parked the truck for an hour and tried it again and the problem stopped. Any connection?
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jgreen3d
GenII
7/01/2007
16:09:38
| RE: TB/idle issues
IP: Logged
Message:
any way to get rid of these google ads on the side of the page?
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jgreen3d
GenII
7/02/2007
21:24:00
| RE: TB/idle issues
IP: Logged
Message:
Its not the TPS. Guys at Holley say it's not the IACM. They think its the O2 Sensor. Unusually poor MPG makes me think so. Engine also walks after idle settles. Any thoughts?
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jgreen3d
GenII
7/04/2007
11:53:57
| RE: TB/idle issues
IP: Logged
Message:
I changed the front O2 sensor, which needed to be replaced, now not running so rich. Changed the IACM and for the time being, the high and low idle has ceiced. Im crossing my fingers that it doesnt come back again like it did after cleaning the throttle body. The engine does still walk between 750 and 900 RPM at a stand still. My mechanic says a vacuum leak would be a constant high idle, but thats the only thing I can think of. Intake manifold gasket leak? MAP sensor? Any help would be much appreciated.
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jgreen3d
GenII
7/08/2007
19:09:19
| RE: TB/idle issues
IP: Logged
Message:
How can I pinpoint if the problem is a plenum leak? I was also wondering if the M1 intake is a good idea and how I can identify the current intake on my truck. I bought the truck after the engine was blueprinted and balenced but got very little info on parts used
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jgreen3d
GenII
7/08/2007
19:25:18
| RE: TB/idle issues
IP: Logged
Message:
also curious about throttle body upgrades for 5.2 dakota if anyone has any suggestions
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modain
GenIII
7/09/2007
15:14:18
| RE: TB/idle issues
IP: Logged
Message:
I find it odd that a blueprinted and balanced engine wasn't fitted with an M1. After all, if you're gonna go for performance whey not do that as well? Anyway, let me answer your questions.
The stock intake manifold is a rounded hump on top of the lifter valley which looks sort of like a beer barrel. That's why it's called a "beer barrel" intake. The M1 sits above the valley and there are individual runners/legs going to each intake port.
The M1 eliminates the plenum leak found on the beer barrel, as there is no need for a plenum. The stock intake is basically half of a barrel with a thin rectangular steel sheet bolted to the opening on the bottom. The gasket blows out allowing crankcase contents to enter the intake.
Pop off the air hat sitting on top of the throttle body (engine off of course), open the butterflies all the way, shine a flashlight down and look at the bottom of the plenum. You'll be looking at the top of the plate. Does it have a large amount of oil on it? If so, suspect a blown gasket.
Check out www.thefastman.com for TB options.
What's your left foot doing?
==============
2002 Graphite QC SLT Plus, 4.7L, NV3500, Superchips 3715, 3.92 LSD, R/T rear swaybar, no chrome, loads o'fun...
2001 Patriot Blue Durango SLT, 4.7L, 45RFE, Superchips 3715, 3.55 Open (for now)
1999 Forest Green Dakota RC Sport, 2.5L, NV1500, 3.55 Open
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jgreen3d
GenII
7/09/2007
17:27:51
| RE: TB/idle issues
IP: Logged
Message:
no oil in the bottom of the plenum, but oil around the flat edge of the TB and in the hat. Is this a common place for oil to collect? My guess on the lack of the M1 is that it may be ported but not sure because of the stock TB (ported as well?) and stock air filter. At this point I am looking for any sign of a vacuum leak that would cause this engine idle walk. Thanks for the help so far narrowing down the problem.
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jgreen3d
GenII
7/10/2007
21:40:53
| RE: TB/idle issues
IP: Logged
Message:
is it possible that a problem with my spark plugs could be causing this wavering idle?
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jgreen3d
GenII
7/27/2007
20:36:11
|  RE: TB/idle issues
IP: Logged
Message:
Unfortunately, my problem still persists after replacing the downstream O2. My truck tends to run on the cool side. My next theory is that the coolant temp sensor or thermostat is telling my truck that it is running too cool. It only reaches a certain point, about 2/3 of the way to the center point of the dial, though Im not sure what temperature thermostat I am currently running. Any thoughts???
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