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jgreen
Dodge Dakota
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6/30/2007
15:14:17
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 Subject: TB/idle issues
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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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Curly
Dodge Dakota
JOIN HERE
7/01/2007
00:17:08
| RE: TB/idle issues
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Message:
try cleaning the IAC "idle air control motor"
back of your TB
also clean the area where it goes into the TB
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jgreen3d
GenII
7/01/2007
16:07:21
| RE: TB/idle issues
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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
7/02/2007
21:30:44
| RE: TB/idle issues
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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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daddio
Dodge Dakota
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7/02/2007
21:43:01
| RE: TB/idle issues
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Message:
check and clean your battery termianls and load test your battery. a weak battery will cause an erratic idle situation.
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brianj
Dodge Dakota
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7/02/2007
22:40:48
| RE: TB/idle issues
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Message:
no it wont.
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jjj
Dodge Dakota
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7/02/2007
22:56:04
| RE: TB/idle issues
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Message:
What are the TPS voltage readings - at idle and is it steady?
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jgreen3d
GenII
7/04/2007
11:55:39
| RE: TB/idle issues
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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. Tested the TPS sensor voltage it was 5.16 volts, it seemed steady but not 100% sure. 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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daddio
Dodge Dakota
JOIN HERE
7/05/2007
10:17:33
| RE: TB/idle issues
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i'm wondering if a loose timing chain couldn't be the source of the flucuating idle?
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N56629
Dodge Dakota
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7/05/2007
11:00:29
| RE: TB/idle issues
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Message:
Your mechanic is wrong. Not unusual. A constant vacuum leak will not cause a constant high rpm because your PCM/IAC will eventually compensate for it. The most common, performance robbing, vacuum leak comes from the imfamous plenum leak. If the tb has been disassembled (MAP sensor removed) that tiny hose can become a leak source.
The voltage to the tps is good but you need to check the output. I don't recall the exact specs but it should be rought .5-1.5v at throttle closed position. It doesn't really matter what the actual reading is as long as it repeats and is steady each time the trottle is returned to the closed position. As you open the throttle the voltage should approach the input voltage reading.
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jgreen3d
GenII
7/08/2007
19:07:32
| RE: TB/idle issues
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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
19:24:09
| RE: TB/idle issues
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Message:
also curious about throttle body upgrades for 5.2 dakota if anyone has any suggestions
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jgreen3d
GenII
7/10/2007
21:42:02
| RE: TB/idle issues
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Message:
is it possible that a problem with my spark plugs could be causing this wavering idle?
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Kowalski
GenIII
7/11/2007
16:09:35
| RE: TB/idle issues
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Message:
Problem shouldn't be the plugs. Look down your TB, can you see some oil inside the manifold ? That would be one sign of the valley gasket leak, along with the poor milage.
note to "brianj" - yes it can ! Daddio posts some very good information here; I guess you're unaware that loss of idle memory can be one of the first signs of a low voltage problem.
Lead, follow, or get out of the way
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jgreen3d
GenII
7/12/2007
07:19:47
| RE: TB/idle issues
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Message:
no oil in the plenum. Ill try checking for voltage issues any way I know how.
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daddio
Dodge Dakota
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7/12/2007
08:49:14
| RE: TB/idle issues
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Message:
i found this on an old post about checking the plenum gskt:
Pull the hose to the PCV valve and plug the valve and the hose. Pull the hose from the valve cover to the air hat on the throttle body and check for vacuum at the hose. If any vacuum then probably a blown plenum gasket
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jgreen3d
GenII
7/12/2007
09:35:29
| RE: TB/idle issues
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Message:
thanks for the tip. No vacuum at the tube between the valve cover and the hat. Just vacuum at the PCV valve where there should be.
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legendracer97
Dodge Dakota
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7/18/2007
01:46:00
| RE: TB/idle issues
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I bet its the O2 sensor or sensors. You mentioned car wash? A loose connection or bad wire with high water pressure would cause a short, and fluxuation in sensor signal to the PCM, causing an extremly lean condition, meaning rough idle. Crawl under and check it out. When in doubt, replace, but only with a MOPAR product. Had a bad experience with an NGK. Computor control systems its best to use OE stuff.
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jgreen3d
GenII
7/18/2007
07:52:08
| RE: TB/idle issues
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Message:
I replaced the front O2 sensor and the IACM at the same time, fixed part of the problem. Could the back O2 cause this situation? I was informed that it wouldn't, but not sure if the info was reliable. By the way, what problems did you have with an NGK? Thanks for the tip.
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Legendracer97
Dodge Dakota
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7/18/2007
13:50:26
| RE: TB/idle issues
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Message:
Well its just that a very sensitive sensor component such as 02 sensors, it deals with half volts and it just seems natural to only put factory equipment on where computer control systems. I had an NGK O2 sensor and somehow it was off a little bit and had the same problem. Yes the back 02 sensor can cause this problem, both must be working properly in order to run right.
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jgreen3d
GenII
7/27/2007
20:34:49
|  RE: TB/idle issues
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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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