Cold starts fine, intermittent start after - Defender Source
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  #1  
Old July 27th, 2016, 02:12 PM
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Drew Rogers
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Cold starts fine, intermittent start after

94 NAS 90 stock 3.9 engine.

Truck cold starts just fine. When turned off and left for an hour or so the truck will just crank. Come back in another 30 mins or more the truck will start just fine. This phenomenon has been occurring regularly for the past month. Have replaced the following one by one trying to figure out the problem with no luck:

Ignition module (moved to the aftermarket plate attached to the ignition coil)
Ignition coil
Distributor cap, rotor, spark plugs and wires

ECU next?

Any help greatly appreciated!
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  #2  
Old July 27th, 2016, 03:54 PM
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fuel pump?
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  #3  
Old July 27th, 2016, 04:09 PM
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Cold start sensor? And some grounds poop out when a rig heats up? - both more associated with stalling once hot, tho.
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  #4  
Old July 27th, 2016, 04:28 PM
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Kevin Keith
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Test the fuel temp sensor.
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  #5  
Old July 27th, 2016, 05:01 PM
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http://www.defendersource.com/forum/...rms-60988.html
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  #6  
Old July 28th, 2016, 07:44 AM
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Drew Rogers
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Quote:
Originally Posted by Shagey71 View Post
Took a look at this thread and seems like the problem there is a little different than what I am experiencing. The truck will fire up np problem if left for 10-15 mim after shutdown. When left for 60-90 minutes it cranks nice and strong but will not turn over.

Fuel pump was replaced a couple of years ago and there is good fuel pressure.

How and where do I check the fuel temp sensor?

The above thread also mentioned coolant temp sensor, but did not fix the problem. Same question how and where do I test it?

Thread stopped with replacing the starter, but no report back on the outcome.
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Old July 28th, 2016, 08:04 AM
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Fuel temp sensor is on the front of the fuel rail. Helps to control hot starts. Coolant temp sensor helps with cold starts but since you're testing anyways. It's on the top of the intake manifold with the two wire connector. Sensor with the single wire on the other side is for the gauge.

You can test on the sensor if you don't want to dig out the ECU.
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  #8  
Old July 28th, 2016, 11:07 AM
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Sam Hagey
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Quote:
Originally Posted by rogersta View Post
When left for 60-90 minutes it cranks nice and strong but will not turn over.
You mean it won't start, but it's turning over and your belts are spinning, etc. Right?
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  #9  
Old July 30th, 2016, 09:09 PM
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Quote:
Originally Posted by Kevin88RRC View Post
Fuel temp sensor is on the front of the fuel rail. Helps to control hot starts. Coolant temp sensor helps with cold starts but since you're testing anyways. It's on the top of the intake manifold with the two wire connector. Sensor with the single wire on the other side is for the gauge. You can test on the sensor if you don't want to dig out the ECU.
Does this apply to a 97 gems system too? Having hot start problems... Engine turns over but stumbles.... Doesnt catch to start...
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  #10  
Old July 31st, 2016, 11:21 AM
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Carlos
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Quote:
Originally Posted by Arcadeus View Post
Does this apply to a 97 gems system too? Having hot start problems... Engine turns over but stumbles.... Doesnt catch to start...
yes, all fuel injected systems use a coolant sensor to help ecu verify fuel mixture when it compares to oxygen sensor data.
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  #11  
Old July 31st, 2016, 12:38 PM
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Drew Rogers
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Quote:
Originally Posted by Shagey71 View Post
You mean it won't start, but it's turning over and your belts are spinning, etc. Right?
Yes that is what I meant. Going to test fuel temp and pressure this week.
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  #12  
Old August 2nd, 2016, 07:31 PM
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Mark Bichin
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So quick update... I had a crappy battery that would turn the starter over (I.e. had enough amperage) but overtime the voltage would drop on it. So I believe that what I thought was a sensor problem not allowing correction for the hot engine/fuel was an issue with the battery. The amperage was enough to turn it over albeit slowly but the voltage was too low to run the ecu..... Put a new battery in and it runs great.... Could be a fluke though... Will let you know if this changes.
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