You can follow the ignition circuit to the starter relay, but, intermittent starting problems are almost always from a bad connection at either the battery or starter.other possibility would be weak or loose ignition at key.
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Will not start how intermittently ? The engine won't turn over or engine does turn but won't start . Starter relay , lose connection . Checking power an grounds would be the first place to start , voltage drop test the main electrical circuits . Voltage Drop Testing the Starter
The starter circuit control is achieved by the starter motor relay ! It is located in the under hood fuse/ relay box or as Chrysler calls it ,integrated power module ! If you pull out the relay an look on the bottom where the pins stick out you will see four sets of numbers .30,87 an 85,86 ! 30 is B+ voltage . 87 is to the starter solenoid . If you jumped those two spots where the relay plugs into the starter would crank the engine over . The last two 85 an 86 are the control side .If you checked with a volt meter where 86 plugged into ,with key on it would show B+ voltage . The last pin is from the PCM - engine computer . When turning the key to start a signal is sent to the PCM to let it know crank has been requested , in return the PCM supplies a ground to pin 85 energizing the starter motor relay sending B+ voltage to the starter motor cranking over the engine . Here is another video on test from the relay base (where relay plugs into ) This is for a horn circuit but same thing . VEHICLE RELAYS Testing from the relay base The relay could be going bad , you never know .Replacing the relay mite not be a bad idea . Good luck , hope this helps !
I would look into the starter connections, the power for the system is tied into the starter, loosen and tighten the connections at the starter, if you have a power distribution box under the hood make sure all the connections to it are clean and tight.
You should be able to find it quite quickly by following either:
- the heavy wire from the starter back to the relay, or
- the heavy wire from the battery to the relay
-If the wire goes straight from the battery to the starter and there is also a lighter guage (thinner) wire that is attached to the starter, then there is no external relay.
The mechanical fuel pump is mounted on the side of the head, centered
between the runners of the intake manifold. The intake manifold does not
require removal, but access can be tricky. A selection of socket
extensions, swivels and open end wrenches can be helpful.
Fig. Fig. 3: Mark the fuel lines and pump mating points
Fig. 4: Unbolt the fuel pump assembly from the engine then
I have an 03 montana intermittant no start, security light flashes at the time of no start. Under the steering colom is a plug that comes fron the ignition with 4 wires pink , orng , blk, ppl. follow the wires and there is a plug. Try unpluging it then plug back in and try to start vehicle. If it starts then what i have done with it was wire in a relay that cuts power on ignition off and will power the module up on ignition.
blk to # 85 on relay, cut orng and attach one to # 30, the other to # 87, then attach pink to # 86. I have this working for 3 months so far no more intermittant start.
Let's keep things simple to start with... Check the battery that it has sufficient charge. (I did say to keep it simple). Ensure the gear selector is in Park or Neutral if equipped with an automatic trans, or depress the clutch pedal if equipped with a manual trans.
Lastly, in keeping things simple... check all the fuses and fuse links (special fusible wire) that power is available to your vehicle's electrical system.
With a test light, check the starter relay with the key in start position is energising the starter relay... bypass the starter relay if no power is present. if the starter operates, you now know the problem is located within the start control circuit (from the key switch through the starter relay to ground via a neutral safety switch (auto) or clutch switch (Manual).
finding the fault should be quick with a circuit diagram.
I have experienced this problem before. Fuel pump is going, I had experts trying to fiqure out they all thought starter, alt, etc. until I banged on fuel tank and it started. This may not be problem but it sounds like.