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greghead
New User
Sep 29, 2006, 7:27 AM
Post #1 of 9
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92 DYNASTY BACKFIRING
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I have a 92 Dodge Dynasty that backfires into the intake plenum when pulling manifold pressure. So far I have used Sea Foam, changed spark plugs, changed fuel filter and changed fuel pump. The problem came on quickly not gradually and seems more pronounced at lower rpms. Any idea's Thanks.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Sep 29, 2006, 11:03 AM
Post #2 of 9
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Re: 92 DYNASTY BACKFIRING
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Cap, rotor and wires maybe?? I think you need to rule them out. Look under dist cap and perhaps if dirty blow it out gently with compressed air, T
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greghead
New User
Oct 7, 2006, 3:01 PM
Post #3 of 9
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Re: 92 DYNASTY BACKFIRING
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Thanks for the input. This car has a coil pack instead of a distributor. The wires did not show flashover in the dark. I'm thinking about trying a new coil pack.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Oct 7, 2006, 4:31 PM
Post #4 of 9
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Re: 92 DYNASTY BACKFIRING
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The high tension stuff will react to something like Windex sprayed all over it and good parts won't care. Hope that may help, T
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steve01832
Veteran
Oct 7, 2006, 6:07 PM
Post #5 of 9
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Re: 92 DYNASTY BACKFIRING
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A spray bottle full of water is my favorite diagnostic tool when the customer complains of a wet running problem! Good post Tom.
Steve
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DanD
Veteran
/ Moderator
Oct 8, 2006, 8:09 AM
Post #6 of 9
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Re: 92 DYNASTY BACKFIRING
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Tom it’s not very often I will go against what you recommend but I wouldn’t use Windex; there is a small amount of alcohol in its mix and could catch fire. I’ve seen it happen and not just under the hood of a car. My wife decided to turn off the TV and clean the screen with Windex; she sprayed the screen and as soon as she touched it with a cloth; static electricity discharged (sparked) and caught the Windex on fire. It was only a flash and then out but was enough to scare the crap out of her. I don’t think she’s cleaned the TV screen since. LOL
I do agree with Steve by using a spray bottle with water but I add a tea spoon of table salt. The salt conducts electricity and you’ll see even the slightest leakage. Spray a very light mist on the wires; they don’t have to be dripping wet; actually it doesn’t work as well if they are to wet. Then use a test light connected to ground; hold the probe close to the wire but not touching as you run the probe along the length of the wire. If there’s any leakage you’ll see the spark jumping to the test light. The amount of spark you’ll see depends on how bad the wire is.
Dan.
Canadian "EH"
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Oct 8, 2006, 9:15 AM
Post #7 of 9
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Re: 92 DYNASTY BACKFIRING
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Not a problem Dan and point well taken. It's just been a habit as my shop which is at home has no running water and I use window cleaner to clean my hands, and any greasy mess I might have made and it works. Just read a bottle of it and it claims ammonia and surficants but nothing else??
I failed at saying the reason and now retract that. The reason for my original post was incomplete and I'll finish it now:
Real clean or distilled water does NOT conduct electricity. Go ahead and test it with an OHM meter. Almost all tap water and even bottled water has enough minerals in it to make sparks jump and would work. I like the touch of salt idea.............. Just tested the generic window cleaner I use and it would not do anything but put a lit lighter out but I can't speak for all brands out there so take Dan's advice folks.
One more for readers: Don't go nuts with this trick and do it with a coolish engine as the mist could break a good part like distributor cap or coil pack or more with the cold shock and really screw up a neat diagnostic trick, Be well all, T
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Oct 24, 2006, 6:14 PM
Post #9 of 9
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Re: 92 DYNASTY BACKFIRING
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Thanks for letting us and the whole world what you found. It will help someone somewhere.
Site is growing like a weed and should as it has great owners, sponsors, techs, and great guests. Happy motoring, T
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Hey I found the problem to be the plug wires. Thanks for the great idea's. I learned once again to try the obvious and less expensive solutions first. I was convinced it was a fuel flow issue.