93 dakota 5.2 flexplate auto trans
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Hello again "95", I'm back at with the 93 5.2L. Unfortunately, the crank sensor was not the problem. However, my question is...If the pick coil in the distributor is bad, can it cause intermitten running. Also, if it is crappin' out, could it cause the oil pressure light to luminate since the distributor is attached to the oil pump? Your expertise is greatly appreciated.
Champion
Joined: May 2008
Posts: 4,839
Likes: 5
From: Apex, NC
The 3.9s and 5.2s don't use a pick-up in the distrubutor, it has what they call a camshaft position sensor... which basically does the same job as a pick-up. This is what the FSM says about it:
this group.
As for your oil pressure light comment, I'm not sure I understand exactly what your saying. By "crapping out" do you mean the engine is stalling or on the verge of stalling? If thats what you mean, yes that would cause the oil light to come on! If the engine is no rotating fast enough to effectively turn the pump, it won't build pressure.
CAMSHAFT POSITION SENSOR—3.9L/5.2L
ENGINE
The camshaft position sensor is located in the distributor
(Fig. 2) on all 3.9L/5.2L engines.
The camshaft position sensor contains a hall effect
device called a sync signal generator to generate a
fuel sync signal. This sync signal generator detects a
rotating pulse ring (shutter) on the distributor shaft.
The pulse ring rotates 180 degrees through the sync
signal generator. Its signal is used in conjunction
with the crankshaft position sensor to differentiate
between fuel injection and spark events. It is also
used to synchronize the fuel injectors with their respective
cylinders.
When the leading edge of the pulse ring (shutter)
enters the sync signal generator, the following occurs:
The interruption of magnetic field causes the voltage
to switch high resulting in a sync signal of approximately
5 volts.
When the trailing edge of the pulse ring (shutter)
leaves the sync signal generator, the following occurs:
The change of the magnetic field causes the sync signal
voltage to switch low to 0 volts.
For component testing, refer to the Diagnostics/Service
Procedures section of this group.
For removal and installation of this component, refer
to the Component Removal/Installation section of
ENGINE
The camshaft position sensor is located in the distributor
(Fig. 2) on all 3.9L/5.2L engines.
The camshaft position sensor contains a hall effect
device called a sync signal generator to generate a
fuel sync signal. This sync signal generator detects a
rotating pulse ring (shutter) on the distributor shaft.
The pulse ring rotates 180 degrees through the sync
signal generator. Its signal is used in conjunction
with the crankshaft position sensor to differentiate
between fuel injection and spark events. It is also
used to synchronize the fuel injectors with their respective
cylinders.
When the leading edge of the pulse ring (shutter)
enters the sync signal generator, the following occurs:
The interruption of magnetic field causes the voltage
to switch high resulting in a sync signal of approximately
5 volts.
When the trailing edge of the pulse ring (shutter)
leaves the sync signal generator, the following occurs:
The change of the magnetic field causes the sync signal
voltage to switch low to 0 volts.
For component testing, refer to the Diagnostics/Service
Procedures section of this group.
For removal and installation of this component, refer
to the Component Removal/Installation section of
this group.
As for your oil pressure light comment, I'm not sure I understand exactly what your saying. By "crapping out" do you mean the engine is stalling or on the verge of stalling? If thats what you mean, yes that would cause the oil light to come on! If the engine is no rotating fast enough to effectively turn the pump, it won't build pressure.
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Registered User
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Could the coil pick up work intermittently? Perhaps, the weak firing might cause the oil pressue light to luminate as if it's about to stall. finally, if the pick up coil works intermittently, maybe the truck runs a few minutes, then stalls. I'm not sure if this is a common scenario.
Champion
Joined: May 2008
Posts: 4,839
Likes: 5
From: Apex, NC
Any electrical device with a bad connection could work intermittenly, but it would be an inconsistent thing.
As for oil pressure, the pump is purely mechanical and the pressure sending unit has no tie to any other sensor or the ignition system. So a weak firing would not cause the light to come on. Only the shaft spinning too slow as the the engine is ACTUALLY on the verge of stalling, and not *******ly on the verge of stalling, would cause that light to come on.
*EDIT* wow, is the word v i r t u a l l y really edited by the filter?!
As for oil pressure, the pump is purely mechanical and the pressure sending unit has no tie to any other sensor or the ignition system. So a weak firing would not cause the light to come on. Only the shaft spinning too slow as the the engine is ACTUALLY on the verge of stalling, and not *******ly on the verge of stalling, would cause that light to come on.
*EDIT* wow, is the word v i r t u a l l y really edited by the filter?!
Last edited by 95_318SLT; Jan 31, 2010 at 06:11 PM.
Thread Starter
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Hello,
Yep, my ignition problem is not what I thought. I think it's more of a vacuum issue. These are the symptoms.
Starts good
Runs fair, several minutes
low idle, about 300-500 rpm
Begins to idle rough after several minutes
Revs poorly
backfires on deceleration
Black smoke from the tail pipe
It stalls
usually fires up again fairly quick
oil smells like gasoline
All the spark plugs foul simultaneously
Never leaves the driveway
I would sure appreciate some insight on this.
Thanks in advance.
Happy Wrenching!
Yep, my ignition problem is not what I thought. I think it's more of a vacuum issue. These are the symptoms.
Starts good
Runs fair, several minutes
low idle, about 300-500 rpm
Begins to idle rough after several minutes
Revs poorly
backfires on deceleration
Black smoke from the tail pipe
It stalls
usually fires up again fairly quick
oil smells like gasoline
All the spark plugs foul simultaneously
Never leaves the driveway
I would sure appreciate some insight on this.
Thanks in advance.
Happy Wrenching!
Thread Starter
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Registered User
Joined: Jan 2010
Posts: 26
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I was afraid of that. However, I forgot to mention the intake and throttle body look pretty suity. Could all my symptoms be similar to a intake gasket failure. I don't seem to be burning any coolant.
Thanks again.
Thanks again.