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Trevor
Dodge Dakota
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1/04/2007
20:55:27
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 Subject: High revs for no reason
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Message:
Ok, this is related to my other thread about popping sound/power loss
When I start my truck, (it's sat and cooled off)and let it idle for a few minutes, something causes the rpms to rev up to 2000 then back down....last time it did this, it went up and down twice. Anybody know what that something may be?
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Trevor
Dodge Dakota
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1/04/2007
21:39:31
| RE: High revs for no reason
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Message:
Could this be my problem:
Distributor Indexing
SYMPTOM/CONDITION:
Vehicles may exhibit surging, light bucking, or intermittent engine misfiring. This will most likely occur when the vehicle is at operating temperature, and under a light load at approximately 2000 RPM. This condition may be caused by a mis-indexed distributor. The following procedure is an alternative to the indexing procedure outlined in the service manual.
REPAIR PROCEDURE:
This procedure outlines an alternative distributor indexing procedure.
Connect a voltmeter to the distributor sensor connector by removing the end seal and carefully back probing the connector. Connect the positive lead to the sensor output pin (pin 3, either a tan wire with a yellow tracer or a gray wire, depending on vehicle application). Connect the negative lead to the sensor ground pin (pin 2, a black wire with a light blue tracer).
Rotate the engine clockwise as viewed from the front, until the number one piston is at Top Dead Center (TDC) of the compression stroke. The timing mark on the vibration damper should line up with the zero degree
(TDC) mark on the timing chain case cover.
Continue to rotate the engine slowly clockwise until the V6 or V8 mark (depending on engine type) lines up with the zero degree (TDC) mark on the timing chain case cover. The V8 mark is 17.5°after TDC and the V6 mark is 147°after TDC. NOTE: DO NOT ROTATE THE ENGINE COUNTER CLOCKWISE. IF THE ENGINE IS ROTATED BEYOND THE MARK, RETURN TO STEP 2 AND REPEAT THE PROCEDURE.
Loosen the distributor clamp bolt.
With the ignition switch in the ON position, rotate the distributor slightly in either direction until the voltmeter switches between the sensor transition point of 0 and 5 volts.
Adjust the distributor as close as possible to either side of this transition point and tighten the distributor clamp bolt to 19-26 N-m (170-230 in.lbs.) .
from http://www.v8performance.com/tipsandtricks.htm#pluggap
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Kowalski
GenIII
1/05/2007
09:15:14
| RE: High revs for no reason
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Message:
Not sure, I see they say symptoms for that problem most likely at operating temperature, whereas it sounds like your problem is with a cold engine. I'm guessing it might be more related to temperature sensor, TPS or IAC. Maybe I'm missing something, didn't read your other post.
Lead, follow, or get out of the way
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Sonny B
Dodge Dakota
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1/05/2007
11:00:09
| RE: High revs for no reason
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Have you done what was suggested in the other thread and check your battery with a load tester? I tested mine and got a bad reading. I changed it and the truck seems to run perfect so far.
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Trevor
Dodge Dakota
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1/05/2007
16:34:23
| RE: High revs for no reason
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Message:
I've done some things...haven't checked the battery.
I put my other TPS sensor i have on there (it has the wrong plugs for the wires) and made a new harness, but the problem persists with the new TPS....so I've ruled that out.
A new wires set, and cap and rotor are coming home with my brother...they're mopar ones, so I'll see if that fixes it.
thanks...i'll keep you posted haha
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Trevor
Dodge Dakota
JOIN HERE
1/06/2007
14:36:58
| RE: High revs for no reason
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Message:
I don't think it's a battery load problem, because the battery will start this truck when it's -20c outside fine, and it charges properly when it's running (13-14 volts)
While switching the TPS sensor, i found another vacuum plug that was off, this is the second one I've found, and I can't find where it goes.
I believe it's running rich..there's more black exhaust then usual, I also believe that it is missing too, just in the way it runs.
I put the new wires, cap and rotor on, it didn't fix the problem.
I switched the map sensor with one I have, and made the electrical plugs work...now when I start it up (inside a shop at 10c) it runs fine for about 5 minutes, then it starts to die, and sucks loudly through the TB (running with the air hat off), it also doesn't miss anymore.
Could this be a vacuum sensor problem?
So far I've ruled this stuff out:
TPS
Plugs
Wires
Cap
Rotor
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Trevor
Dodge Dakota
JOIN HERE
1/21/2007
15:22:15
| RE: High revs for no reason
IP: Logged
Message:
Bad upstream O2 sensor...took too long to send to the computer.
Thanks for all your guys help.
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