Starting issues - Slow Start After Truck Warms - Defender Source
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  #1  
Old March 27th, 2015, 04:15 PM
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Starting issues - Slow Start After Truck Warms

I've done the searching but nothing to help on this. And it's driving me MAD.

Will keep this simple as possible

Once truck gets warmed up/get to running temp and I stop for a moment (turn off) truck struggles to start

It's more of a slow start. In most cases truck starts with one turn of the key. Now once truck runs for a bit, turn truck off to get gas or run into store truck struggles to start, may take two/three turns of key

In some cases truck appears not to crack, you think based on sound, but then after letting key go truck slowly picks up to a crank/starts

Items replaced...
plugs
cap & wires
rotor arm
vent crankcase breather
stepper motor
fuel temp sensor

Please help if you can???
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  #2  
Old March 27th, 2015, 06:33 PM
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Not sure what you are saying ... Does the starter motor seem to struggle? If that's the case then maybe the head shield is shit and is cooking the starter.

If it's turning over quickly but not starting then I'd look at the stepper motor again.
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  #3  
Old March 28th, 2015, 11:33 AM
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Yes, a strange issue?

Starter does not seem to struggle. Once truck warms & after a stop (turn truck off), starting tuck appears to struggle.

Also when driving truck at distance & weather is warm the issue is worst. In this case I need to let truck sit for a bit (cool down), truck starts right.
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  #4  
Old March 28th, 2015, 12:14 PM
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Rule out fuel pressure. Sounds similar to my issues, but sometimes mine wouldn't start at all. It was just the fuel pump down dying and sometimes sending less than 5 lbs. Has your coil ever been replaced?
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  #5  
Old March 28th, 2015, 02:23 PM
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Fuel pressure was tested several times, had to replace pump last year.

Coil was replace, think 5 years back. Also have the relocation kit for ignition module, relocated around 5 years back as well.
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  #6  
Old March 28th, 2015, 02:48 PM
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Did you check the pressure on the rail or just at the filter? And was the pressure regulator replaced too? I wouldn't rule it out completely just because the pump was replaced recently. It's still most likely to be the cause based on your symptoms - Although definitely less so considering it does have a new fuel pump. But that's not the only component in the system.

When you installed the relocation kit, was the amplifier replaced at the same time? Or just relocated.

Have you also checked to make sure the stepper motor is resetting itself when you're trying to start the truck?
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Old March 28th, 2015, 03:21 PM
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Coolant temp sensor. Not the one for the gauge. But the one for the ECU.
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  #8  
Old March 28th, 2015, 03:34 PM
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Check coil for leaks. When they do leak they will do what you are reporting, bad hot start.
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  #9  
Old March 28th, 2015, 04:59 PM
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I do have a new coolant temp sensor, just lazy on replacing due to weather being so cold lately or at least getting cold again. Will change week coming up.

Not sure on the amplifier being replaced at the time of installing relocation kit (?).

Yes pressure was tested at rail, filter & at pump when tank was out.

Was pressure regulator replaced, NO.

How do you check to see if stepper motor is resetting?

What's the best way to check leaks at coil?


Thanks for the help on this.
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  #10  
Old March 28th, 2015, 05:23 PM
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Not sure, but sometimes a stinking throttle body can cause this.

I had a vehicle in which, the problem started out this way. Over time the issue turned into a stumbling accelerator from stop. It would then stall out. And of course it would then not restart.

Pull the throttle body out and give it a really good clean.

I latter discovered that the pcv system was blocked, with all the crank case oil mist going through the throttle body. It would then get sticky much faster.
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  #11  
Old May 3rd, 2015, 01:00 PM
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This turned out to be an f'n disaster.

Finally had a free moment to fix/replace Coolant temp sensor.

Well...the new sensor from RN will not get tight. Gets to a point of tightening, then gets loose. Yep...appears to be stripped, so this means it will not maintain pressure for cooling system.
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  #12  
Old May 3rd, 2015, 01:08 PM
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My guess is the fuel pump is acting up. Put the old CTS back. Gob up threads with a lot of teflon tape.
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  #13  
Old May 3rd, 2015, 01:33 PM
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I would put the old one back on but the plastic nut cracked when taking it off. What a day.

What a day this has turned out. Think I'm calling it a day & getting drunk - where's the Bourbon (?) - KRAP, I'M OUT - OK, GIN & TONIC'S WILL DO.
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  #14  
Old May 5th, 2015, 12:42 PM
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I had same problem with my 3.5L. Turns out mine was suffering from vapor lock. I installed an Edelbrock 1" phenolic spacer and truck starts without a problem.
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  #15  
Old May 7th, 2015, 07:32 PM
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I've ordered a new Coolant temp sensor - OEM & not a replacement part.

RN did state they've seen some issues with replacement parts for the Coolant temp sensors.

With this said I ordered an OEM part.

Will report back later next week.

The fuel pump clicks on every single time, even when the problem surfaces after running truck at running temps (?).
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  #16  
Old May 16th, 2015, 11:07 AM
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Installed the new Coolant temp sensor (OEM). Installed and tightens as it should.

Was told, in some cases the replacement part's plastic nut will spin - not good. Which is why it would not get tight.

As for slow start when warm (?) - will post back once I drive truck for a bit of time.
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  #17  
Old May 16th, 2015, 06:03 PM
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Literally just had the spin issue on a new cts reordered and received a copper body sensor vrs the plastic...same number different manufacturer... FAG if I remember correctly.
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  #18  
Old May 16th, 2015, 06:21 PM
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PN for the coolant temp sensor please. Its next on my hit list. Cold start is good warm start bad is exactly what I'm facing.
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  #19  
Old May 18th, 2015, 11:20 AM
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Just an update... Plastic relays have nothing to do with my issue... I may have a bad battery
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  #20  
Old May 19th, 2015, 12:47 PM
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Part#...RNM134 - SENSOR COOLANT EFI DEF, DISCO I, P38A

At present time - cannot tell if this fixed issue (?)

Overall - truck is running better.

------ Follow up post added May 19th, 2015 01:49 PM ------

This is the part that gave me problems/did not work (?).

Part#...PLM134 - SENSOR COOLANT EFI DEF, DISCO I, P38A
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