Defender 90 (97) wont start when motor hot? - Defender Source
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  #1  
Old December 27th, 2010, 06:57 PM
wolfgang
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Nels Larson
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Defender 90 (97) wont start when motor hot?

HI. My wifes Defender 90 1997, is having an issue. When she takes it out and has to stop anywhere, when she tries to restart it. It wont start for about 2 hours of sitting. I just changed the in line fuel filter. That didn't do anything. Any ideas? (1997 defender 90 4.0l)
Simptoms:
1. Stalls while going down hill (not accelerating)
2. Wont restart after it has been driven (2 hrs wait).
3. When trying to restart it backfires.
4. It has no power when you floor it.
5. Replaced inline fuel filter 2 days ago ( made no Difference)
6. We just run 85 octane gas in it.
7. Replaced muffler about 3 months ago ( jus because it had a leak).
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  #2  
Old December 27th, 2010, 07:13 PM
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85 octane??
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  #3  
Old December 27th, 2010, 07:24 PM
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When its not starting is when you should try to diagnose the problem, figure out if its fuel or ignition. Listen to hear if the fuel pump primes, are you getting spark? Then you can figure out where to start first.
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  #4  
Old December 27th, 2010, 07:31 PM
wolfgang
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Nels Larson
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I was just reading crown14 post. Could it be the co2 sensors? I cant check it out when it happens because the car is out of town.
Can you Give me some things to check, based on the symptoms.
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  #5  
Old December 27th, 2010, 07:38 PM
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First off, congrats for buying a 90 for you wife... She must be pretty cool. My wife drove a 97 SW for 3 years.

How long have you had the truck? Miles? How long ago did this start? Did it start having problems once it got cold outside?
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  #6  
Old December 27th, 2010, 09:33 PM
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Quote:
Originally Posted by Neil McCauley View Post
When its not starting is when you should try to diagnose the problem, figure out if its fuel or ignition. Listen to hear if the fuel pump primes, are you getting spark? Then you can figure out where to start first.
X2


fuel pump?
You can figure this out. Everything needs fuel and spark.
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  #7  
Old December 27th, 2010, 10:40 PM
wolfgang
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Nels Larson
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Well my wife picked it out herself. She wanted a vehicle that would hold its value.
Now I guess since it starts and runs until you turn it off when it is hot that the fuel pump has to be working right?
So what would cause it to not restart after it has been driven for a while?
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  #8  
Old December 27th, 2010, 10:51 PM
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Quote:
Originally Posted by wolfgang View Post
Well my wife picked it out herself. She wanted a vehicle that would hold its value.
Now I guess since it starts and runs until you turn it off when it is hot that the fuel pump has to be working right?
So what would cause it to not restart after it has been driven for a while?
You said it has no power when you floor it. That combined with it running for a while then has problems on restart is classic fuel pump going out problems. Same thing on several cars for me. There are other possible issues. Have you pulled the gas cap when you are having an issue. I see you are from my home state and deal with a lot of altitude changes.You might have aclogged vent tube and be dealing with vapor lock.

We are trying the best we can to help with the information you provided. There must be a rover group near you that can provide better insight.
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  #9  
Old December 28th, 2010, 12:48 AM
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A few things:

1 - I agree, your wife has to be cool to have picked out a defender to drive. (this thread is useless without pics, just kidding)
2 - You should be using Premium fuel not 85 octane
3 - Do you hear the fuel pump buzzing when the key is in the 1st position?
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  #10  
Old December 28th, 2010, 12:15 PM
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When it won't start...check and see if it's got spark. If not, go after the crank angle sensor or even the wiring that runs down to it. This sensor will act just like this when it starts go'n bad. The wiring will also break down over time so investigate that as well. It can also give misreadings of fueling too.
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  #11  
Old December 28th, 2010, 03:52 PM
wolfgang
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Nels Larson
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Crack angle sensor? WHAT is this?

------ Follow up post added December 28th, 2010 03:03 PM ------

I just went out and put a fuel additive that is supposed to help clean the injectors. After I added thuis I started it up, You can turn the key to the second setting and hear the fuel pump working. It always starts right up. Anyway I opened the hood and after it was warmed up a bit i increased the throttle to about 3/4. It satrted to back fire very violently, one right after the other. Does this ring a bell with anyone?
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  #12  
Old December 28th, 2010, 05:44 PM
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Have you used 93 octane yet?
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  #13  
Old December 28th, 2010, 05:59 PM
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Come on, guys. The octane of the fuel doesn't explain this. Does unscrewing the filler cap solve the no start issue? I highly doubt it, but maybe the tank isn't venting properly?
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  #14  
Old December 28th, 2010, 06:10 PM
wolfgang
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Nels Larson
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I am taking it over to a guy named Merle who has an import shop here. He is going to test the fuel pump for me. I will let you know what I find out. He said it is backfiring because it is running lean on fuel.
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  #15  
Old December 28th, 2010, 08:38 PM
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I'm tell'n ya....check the wiring on the crank angle sensor. The wiring insulation will break down over time and make a connection between the two wires and cause this exact problem. I just fixed one an hour ago with these same issues.
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  #16  
Old December 29th, 2010, 09:29 AM
wolfgang
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Nels Larson
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Were is the crank angle sensor located?
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  #17  
Old December 29th, 2010, 11:10 AM
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Could a bad oxygen sensor do this?
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  #18  
Old December 29th, 2010, 12:42 PM
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Jake K.
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An o2 sensor would not cause this. The crank angle sensor is in the same place as the starter but on the opposite side of the motor(driver's side). Unplug the multi-plug from the sensor and pull the wiring up to the top of the motor so it's easier to inspect. Peel back the conduit and look for any raw wire exposed. About six inches back from the plug it turns into coax cable and the breaks are normally found in the first six inches of regular wire. If you find a break just separate the wires from each other and heat-shrink them individually and then wrap them back up in new conduit. tada!
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  #19  
Old December 29th, 2010, 12:52 PM
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Nels,

I had the same issue/symptoms with my Disco I on item #2.

Check the solenoid wire at the starter, I bet it's loose.

When the truck is hot, metal expands and you'll have a bad connection.

Disconnect the battery (both terminals) and do it while the truck is cold.

Hope this helps.
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  #20  
Old December 29th, 2010, 12:58 PM
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Quote:
Originally Posted by rrc.swb View Post
Nels,

I had the same issue/symptoms with my Disco I on item #2.

Check the solenoid wire at the starter, I bet it's loose.

When the truck is hot, metal expands and you'll have a bad connection.

Disconnect the battery (both terminals) and do it while the truck is cold.

Hope this helps.
It's not that it won't crank..it won't start!
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