d90 bogging & hesitating off idle - Defender Source
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  #1  
Old April 6th, 2004, 02:26 PM
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brian bertolini
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d90 bogging & hesitating off idle

Hey everyone, my truck started bogging off idle at a stop light today. I'm having to rev it to a couple grand to keep it from lurching. It seems fine at the higher revs though- but when starting the truck I have to give it gas. If I push the pedal to the floor it will bog down. Anyone have any experience with this? There are no fault codes.
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  #2  
Old April 6th, 2004, 02:44 PM
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Check your spark-plug connections at both ends of the wires.
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Old April 7th, 2004, 10:10 AM
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Alright now it won't start! It sounds like it wants to catch here and there but won't fire up. Any ideas now?
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Old April 7th, 2004, 10:41 AM
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So, the starter spins and you can get the motor to crank at least 120 rpm.

Have you checked for spark?

And are you getting fuel?
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Old April 7th, 2004, 11:21 AM
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I'm gonna get cracking on it in a few hours- try to get an idea of what's wrong with it this time.
Thanks mike
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  #6  
Old April 7th, 2004, 11:28 AM
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Cool, let us know what you find, I just did some searching on the subject ( to try and help) and found allot of unresolved threads.
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Old April 8th, 2004, 03:16 PM
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I had a similar problem. Turned out my distributor had moved less than a quarter inch. I used a timing light to fix the problem. Find the mark for 5 deg. BTDC on the bell housing, connect the timing light, turn engine on and turned distributor until 5 deg. mark and the mark on the block line up. This worked for me. Could also be a bad distributor cap or rotor, check both of these.
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  #8  
Old April 8th, 2004, 06:49 PM
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Also check out your vacuum advance hose.
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  #9  
Old April 8th, 2004, 06:57 PM
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I'm wondering if it is distributer related. How do I check the vac advance? The hose appears to be good with no leaks when I hold one end closed I can feel the suction from the plenum. Does this sound like an air gap issue? Other than changing the cap and rotor I don't know how to work on a distributor- or I have never worked on one in the past. Another thing is that I hear a whistling noise coming from the rear of the engine. It's definately not a belt- and it has become worse over the past couple of months. Now it's getting to the point where it doesn't want to start at all. I could really use some help with this pos. I don't trust any mechanic down here anyway- and other than the dealer there is only one. There appears to be sufficient fuel pressure but I haven't pressure tested it as of yet.
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  #10  
Old April 8th, 2004, 07:55 PM
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The distributor is rotated to establish the spark timing in relation to the cylinder movement. It can be advanced and retarded to establish different explosion management and so forth. I have a disti-less 97 motor, so I haven't had to do much with it.

Get someone to pull that page out of the service book for you...
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  #11  
Old April 9th, 2004, 02:49 PM
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Problem solved

Thanks for the help guys! It ended up being a timing issue- the nut that holds the distributer tight loosened up. The distributer had moved all the way back- retarding the timing. I advanced it and set it.
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Brian Bertolini
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  #12  
Old April 9th, 2004, 04:03 PM
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Very good Brian. Hawks nailed it.

What d-90.com is all about.
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