Truck Died on Hwy, Wont Restart. - Defender Source
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  #1  
Old May 16th, 2016, 11:32 AM
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Truck Died on Hwy, Wont Restart.

Ok I am seeing if anyone has any ideas I need to check that I may be missing to diagnose.

The vehicle started bucking soon after pulling of the freeway. Im glad it died on a two lane vs 8. I was on my way to rlynchs to get an alignment but the vehicle decided against it. I could restart it but it was not able to idle well or respond well to throttle.

Rob and Phil came out and we swapped Coil, Ign Mod, ECU, Relays, chicklet, and checked fuses on the side of the road. I had spark so we assumed it was fuel pump and I had it towed. Before dropping the tank I checked fuel pressure using the adapter i saw on one of Lav's threads chasing the same issue. Turns out I have 40 psi at prime and then steadies out at 35. Started the truck and the pressure never dropped even when the truck died. Pulled the line off at the rail to check flow and had plenty of fuel come out. I also swapped the MAF with one Brewie had. Confirmed the injectors are pulsing.

Where I am now is I believe the truck is getting flooded by lack of spark and when you nail the throttle it just chokes out. I am going to try the ignition trouble shoot from the manual. I am unsure of what else would kill the truck suddenly. Any other ideas?
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  #2  
Old May 16th, 2016, 11:38 AM
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Robert Davis
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Sorry about your failure...
Truck died is really not a definitive phrase.
So you are saying it stopped running, but will spin over with the starter?
If so suggest you change the cap, rotor, and high tension leads (sparking plug wires).
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  #3  
Old May 16th, 2016, 11:41 AM
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What about the PCV system? the Cannister like thing at the top of the valve cover on passenger side might be all clogged up?
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  #4  
Old May 16th, 2016, 11:42 AM
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If the fuel pressure did not change when started, the fuel pressure regulator is not working or the return line is restricted. Fuel pressure should drop as the manifold pressure drops.
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  #5  
Old May 16th, 2016, 11:42 AM
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Robert,

Sorry needed a little more detail in there.

Truck will turn over. If it sits for a while it will fire up for a few and idle but will eventually die. If you slowly increase throttle it will respond but any quick throttle response sounds choked. When it finally craps out I cant get it to fire again.

I am running 8mm Magnacores that are a couple years old. The rest of the ign system is pretty new. The cap is genuine. I will swapping the cap and rotor with new ones to see where that stands as well.

------ Follow up post added May 16th, 2016 11:46 AM ------

Quote:
Originally Posted by Red90 View Post
If the fuel pressure did not change when started, the fuel pressure regulator is not working or the return line is restricted. Fuel pressure should drop as the manifold pressure drops.
Watching the pressure it dipped to 30 momentarily. Stayed fairly constant in the 35 psi range.

Not sure I can get it to stay running long enough to be exact.
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  #6  
Old May 16th, 2016, 11:58 AM
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throw a timing light on it yet?
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  #7  
Old May 16th, 2016, 12:17 PM
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What is the condition of your battery? I once had very much the same scenario on my '99 DII...after checking all the items you mention above as well as changing TPS and CCPS with no success. I finally came across a thread somewhere about a weak battery causing many strange issues. My battery was putting out 10.9 volts which apparently is weak enough to cause issues. I installed a new battery and low & behold it ran like a charm.
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  #8  
Old May 16th, 2016, 12:37 PM
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Battery should be fine. Its a Diehard Platinum Marine. Im sure its putting out much less now since I been cranking it and draining it.

I havent put a timing light on it yet. When it does idle its nice and smooth. Until it kills off.
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  #9  
Old May 16th, 2016, 12:52 PM
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How many miles? I bet your chain is stretching and a timing advance clears this up.
Or your ignition box has a bad ground or other gremlin.

I broke down coming off I-55 in Illinois, same thing. At highway speed I was fine, but if I laid off, it bogged down. Did the same thing as you, spark- Check, Gas presure - Check, Voltage - Check. Still wouldn't go.

Good luck!
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  #10  
Old May 16th, 2016, 12:55 PM
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Quote:
Originally Posted by Shagey71 View Post
How many miles? I bet your chain is stretching and a timing advance clears this up.
Or your ignition box has a bad ground or other gremlin.
176K. Before crapping out I was probably doing about 85 for a few miles running strong before pulling off the exit. A couple miles down the road it just bucked and lost all power.
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  #11  
Old May 16th, 2016, 02:52 PM
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I bet your ECU is corroded.


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  #12  
Old May 16th, 2016, 03:13 PM
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Quote:
Originally Posted by Nomar View Post
I bet your ECU is corroded.


.
OP says he swapped ECU
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  #13  
Old May 16th, 2016, 03:54 PM
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Quote:
Originally Posted by Shagey71 View Post
OP says he swapped ECU

I can swap my spare as well. Pretty sure i will get the same result. The only parts we haven't swapped are Cap&Rotor and Fuel Pressure Reg.

I recently installed a Action Alternator that I probably should have checked out as well.
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  #14  
Old May 16th, 2016, 04:16 PM
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I got a dollar says it's a dead fuel pump
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  #15  
Old May 16th, 2016, 04:58 PM
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It's electrical. Maybe relay or ignition switch
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  #16  
Old May 16th, 2016, 05:00 PM
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Quote:
Originally Posted by o2batsea View Post
I got a dollar says it's a dead fuel pump
OP says he's got fuel, and consistent pressure through relay clicks.

I got $2 says timing... Cap and rotor haven't been touched yet. I think it's probable.
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  #17  
Old May 16th, 2016, 05:30 PM
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Timing goes suddenly out? That seems far fetched unless the disti bolt came loose. Which I haven't seen before..
I'll throw a timing light on it and see though..
I'm leaning towards the amp module even though we threw my spare on it, that does not mean it's good.

I also have a MAF and some other stuff we can try but it did happen when going from hwy speeds to side streets.
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  #18  
Old May 16th, 2016, 06:18 PM
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Quote:
Originally Posted by rlynch356 View Post
Timing goes suddenly out? That seems far fetched unless the disti bolt came loose. Which I haven't seen before..
I'll throw a timing light on it and see though..
I'm leaning towards the amp module even though we threw my spare on it, that does not mean it's good.

I also have a MAF and some other stuff we can try but it did happen when going from hwy speeds to side streets.
Vacuum advance. If it starts, then dies that still follows logic. There's a timing advance for startup on these, yeah?
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  #19  
Old May 16th, 2016, 06:24 PM
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No I follow the logic, I just don't see it happening from one minute to the next. The set bolt would have to be way out and a bump spinning it..
Easy to check though..
It acts like the fuel pump is gone but tests seem to show otherwise
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  #20  
Old May 16th, 2016, 06:25 PM
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Check the connection at the ECU- we had a bad one where the clip was broken, and contact was intermittent causing issues randomly. Ended up with big zip tie to hold plug/ECU tight, and no more issues....
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