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Unread 09-19-2003, 05:46 PM   #1
errodri1961
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diseling??

Hello again,
My 98 GC 5.9 with 87k make a disel like sound when i speed up or at low speed when i accelarate softly.. what causes this and what can i do to fix it??

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Unread 09-19-2003, 05:59 PM   #2
10achik
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Is it when the engine is cold or shortly after you start it and get ready to take off? If so, that's normal...
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Unread 09-19-2003, 11:11 PM   #3
errodri1961
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that's correct, also when i'm doing around 40 or so and if i want to accelerate it makes that sound..
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Unread 09-20-2003, 12:16 AM   #4
Harald
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Quote:
Originally Posted by errodri1961
that's correct, also when i'm doing around 40 or so and if i want to accelerate it makes that sound..
Can be too advanced egnition timing or too low octane on fuel you are using...
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Unread 09-20-2003, 09:20 AM   #5
errodri1961
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can i check the timing on this truck even if it use a computer??
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Unread 09-20-2003, 12:32 PM   #6
10achik
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Quick and easy answer is let it warm up for about 2 to 3 minutes before you take off. Mine does it and so does my wife's durango. You could have it checked but I'm pretty sure you will get the same answer. It will get even worse in the winter
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99 GC Limited - 4.7L HO V8, 6.5" IRO HC LA lift, F&R D44s locked & trussed, 242HD, IRO TC Skid, KMA Bumper, 35's
2006 Saturn Redline -2.0L Eaton supercharged I4, GMPP Stage 2, Custom Tune, AEM CAI, Ebiach Pro Kit w/ swaybars, EVO Ventus V12s (13.76 @ 103.85)
2006 Pontiac G6 GTP
2012 Nissan Juke - (hers)
2000 SV650 - naked, integrated tail light, sliders, corbin, pilot roads, RK chain & sprokets, D&D full exhaust, FactoryPro Stage I jet kit, +4 Ignition Advancer, Barnett race clutch
2006 Triumph America 900 - Full Dresser

January 2009 Grand Cherokee of the Month (GCOTM)
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Unread 09-20-2003, 03:54 PM   #7
whitevette
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Also be aware that what you're describing in your first post is not dieseling. Dieseling is when you turn off the engine and it keeps running.
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Unread 09-22-2003, 07:10 AM   #8
97RedBird
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Sounds like pinging to me. During the summer it is worse for me so I use 89 octane minimum. During the other seasons we can go down to 87 octane with no problems. If it is pinging increase the octane or take it easy.
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Unread 09-22-2003, 08:00 PM   #9
JAURS
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My truck does the same thing with the 318 V8, especially the hotter it runs in off-road situations, etc... I think it's perfectly normal, mine has pinged every once in a while since new. I switched to 93 octane and now it does it slightly more but then again I have 142K miles. All in all, I've talked to many people about the problem and it doesn't effect engine life or cause any harm, so you should be fine.
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Unread 09-22-2003, 09:16 PM   #10
errodri1961
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JAURS thats good to know, i was worry about it. i will continue to use 91 octane. (i thinks that our higher octane here in colorado) also i notice that when i turn the lights on the interior dash light will dimm and after while they will get bright again... does anyone has any idea whats going on??
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