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Keith
Dodge Dakota
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11/22/2002
14:26:34
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 Subject: Please For The Love Of God HELP!!!
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I Have A 1994 Dodge Dakota 3.9L And I Cant Seem To Figure Out Why It Pops And Backfires Consistantly. I Have A Gen I K&N Intake, No Cat, And A Flowmaster 40 Series Exhaust. I Have Done A Full Tune Up, Double Checked For Exhaust Leaks, Checked Fuel Pressure, Double Checked Plug Gap (.35), Cleaned EGR, Replaced Intake Manifold Gasket, Checked All Vaccum Hoses And Im Still At A Loss. So I Figure I'd Come To My Fellow 6ers And Get Alot Of Opinions About My Problem. I Think It Might Be The Timing Chain Or Injectors. ANY Info Your Guys Might Have On This PLEASE Let Me Know. Im About To Just Kick It To The Curb And Say The Heck With It. Thanks For The Tech Support And Fudge Honda =). That Is All.
-Keith
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Black Dog
Dodge Dakota
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11/22/2002
14:49:17
|  RE: Please For The Love Of God HELP!!!
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I love god. Examine your Timing. Get a tach and a timing light. I suspect that you may not have a distributor that you cant adjust, I do. I know some 3.9's do not allow for timing adjustments. Good luck. Performance 8mm wires, cap and rotor and autolite 3923 sparkers may help.
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Jon
Dodge Dakota
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11/22/2002
14:59:41
|  RE: Please For The Love Of God HELP!!!
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Is it backfiring or are you just getting exhaust pops? I think exhaust popping might be more noticable becausse you have a low restriciton exhaust, i know mine started doing it occasionally after i put my flowmaster 40 on.
-Jon
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Brian Maier
Dodge Dakota
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11/22/2002
15:06:01
| RE: Please For The Love Of God HELP!!!
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Mine definatly started popping once i put on a low restrictive exhaust, especially if i downshift to brake.
Brian
1994 3.9l 2WD Ext Cab Dodge Dakota
JBA headers, JBA 8mm wires, Borg Warner Select Cap & Rotor, Autolite 3923, MSD 6A, Accel Super Coil, K&N FIPK, Hi-Flow Catalytic Converter, Flomaster Muffler, Robertshaw 180 T-Stat, V8 TB, S-Bolt
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Dakota Bob
GenII
11/22/2002
19:57:28
| RE: Please For The Love Of God HELP!!!
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The 94 3.9 timing is controled by the computer no adjustment.
Bob
94 CC 3.9 Stage2 Chip,JBA Headers,19# FI,Flow Master 40s, Bosh Plat.Plugs, K/N Chrome Filter, 195 T Stat ,Flometrics TB, Mopar Wires
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NOSDART68
Dodge Dakota
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11/22/2002
21:13:15
|  RE: Please For The Love Of God HELP!!!
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Keith, try changing the coil. My 92 had a bad coil and wasn't throwing any codes. It had similar problems and was making the truck do some funny stuff. I would try doing that.
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Tom
Dodge Dakota
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11/23/2002
20:02:23
|  RE: Please For The Love Of God HELP!!!
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I agree with all the above. As far as helping diagnose a possible bad coil, have someone drive behind you on a day it seems to be "popping" quite often. Have that person smell for a roten egg smell coming from your exhaust. If they smell it, of something like it, then more then likely the coil is on its way. Its very normal for a coil not to put out a trouble code. Hope this helps.
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Tom
Dodge Dakota
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11/23/2002
20:50:39
| RE: Please For The Love Of God HELP!!!
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I agree with all the above. As far as helping diagnose a possible bad coil, have someone drive behind you on a day it seems to be "popping" quite often. Have that person smell for a roten egg smell coming from your exhaust. If they smell it, of something like it, then more then likely the coil is on its way. Its very normal for a coil not to put out a trouble code. Hope this helps.
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Keith
Dodge Dakota
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11/26/2002
17:33:59
| RE: Please For The Love Of God HELP!!!
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Thanks For All Your Help Guys Ill Try The Thing You Guys Suggested And Ill Make A Post Called "For The Love of GoD Part-2' =) Thanks Again
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mdandl
GenIII
11/27/2002
08:07:00
| RE: Please For The Love Of God HELP!!!
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Have u checked compression, a burnt valve or wiped out camshaft can cause this, also like above post the coil can cause many crazy things, btw intake valve problems= poping/ backfiring through intake, exhaust valve problems= poping / out of the exhaust
1997 Dakota Sport RC V6, Magenta, Dynomax Ultra Flow, K&N, APC Clear Corners, NR White Face Gauges, Mopar Boards, rails, Line-X, and Others to come
2000 Dakota Sport RC V6, Dynomax Ultra Flow, K&N, ARE Cover, Soon to be PLUM CRAZY
NEW TOY 1987 Dakota RC LB V6
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ranger
Dodge Dakota
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11/27/2002
10:55:24
| RE: Please For The Love Of God HELP!!!
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just a basic recommendation, check and make sure all your spark plug wires are routed to the correct spark plug...
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cbmoose
Dodge Dakota
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11/28/2002
21:44:39
| RE: Please For The Love Of God HELP!!!
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I own a '93, so maybe I can help. First off, you should be able to check your timing. See if it's constant, or if the mark wanders around. Mine was wandering, which gave it an inconsistant idle, and in the process of setting the basic timing (which according to the Haynes book is something you CAN do) found that the tip of the rotor was loose, allowing it (and the timing) to wander around.
Modern computer controlled vehicles are sensitive to the amount of airflow through the engine. There is no device on this engine that actually meters the amount of airflow through the engine, like a hot-wire flow sensor that some GM's and Fords use. Chrysler's engineers tested and certified the intake-engine-exhaust combination with the same devices that you got with it, i.e. the air cleaner and catalytic converter.
The bottom line is that the improvements you've done have leaned out the air-fuel mixture. You've improved the airflow so much that the oxygen sensor (you still have that in the exhaust stream, don't you?) is at its leanest point, and the computer cannot enrich the mixture enough to bring the fuel-air ratio back down to 14.7:1 from its present 16-17:1 ratio. If only Mother Mopar had included a mass-airflow sensor. But they cost money, and in the true hot-rodder tradition if you don't need it then why put one on?
What you've done is equivalent to trashing the stock exhaust on a motorcycle. This leans out the mixture, so you have to change the position of the carburetor needles so that more fuel can flow into the engine, and take advantage of all of that fresh air rushing in there. Your next step is a performance computer. Have fun, and good luck.
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Keith
Dodge Dakota
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12/08/2002
16:41:09
| RE: Please For The Love Of God HELP!!!
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Needles On My Carb? I Have A Fuel Injected Engine.
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cbmoose
Dodge Dakota
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12/08/2002
17:01:56
|  RE: Please For The Love Of God HELP!!!
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I have the same engine you do, just a year older. I just figured that maybe you had worked on motorcycles somewhere along the way, and you'd understand where I was going. But, no problem. The bottom line is that now that you've improved the ability of the engine to flow air, you need to give it more fuel so that the engine can take advantage of that air. So...you still need a performance computer, maybe the Stage 2 chip that Dakota Bob mentioned above.
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Keith
Dodge Dakota
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12/09/2002
11:03:07
| RE: Please For The Love Of God HELP!!!
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Oh Ok Im Gonna Go For The Coil First And Then Go With Fuel Management.Then Upgraded ECU And Ignition. But First Things First I Need A Cluth. Haha This Truck Is Forever Needing Repair.
Thanks
-Keith
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Keith
Dodge Dakota
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12/09/2002
11:03:26
| RE: Please For The Love Of God HELP!!!
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*Clutch
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intensedak39
*GenIII*
12/09/2002
11:22:15
| RE: Please For The Love Of God HELP!!!
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"computer controlled vehicles are sensitive to the amount of airflow through the engine. There is no device on this engine that actually meters the amount of airflow through the engine"
dodge's do have a way of measuring the amount of air coming into the motor.... it's called a MAP sensor (manifold absolute pressure) and it measures the amount of pressure in the manifold and uses that in conjuction with the IAT, TPS, coolant temp sensor, and O2 sensors to determine how much fuel to add. If you increase the amount of airflow, the map sensor will catch it and the computer will adjust it. The fact is computer controlled engines are easier to change the air flow. On a carbed motor if you added more air it is a trick to get the jetting rights... The computer will do it for you on modern computer controlled vehicles.
keith,
if its not exhaust popping like mentioned, it is something in your timing. If you know how to use a timing light use it and see how the marks line up on the timing plate. If you want to do it easier just take it to a mechanic and have them do a diagnostic on your truck. It usually costs around $75 here (dallas) and is a lot better than spending money on stuff that you do not need.
either way good luck!
intensedak39
turbocharged V6
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.alex.
Dodge Dakota
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12/09/2002
12:00:34
| RE: Please For The Love Of God HELP!!!
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Let's not forget that he has removed his catalytic converter..... Let's also not forget what the catalytic's job is....
The way the cat works is that it heats up and the special metals inside "convert" the raw exhaust gases into less noxious pollutants. The thing is, there's some actual combustion that's still taking place in the catalytic converter body. The raw unburned gas in the fumes (the brown puffs coming out of the tailpipe under full accel) are being burned off in the catalytic. The honeycomb mesh in the catalytic silences this process.
But on this truck with no cat, those gases are not being converted. The exhaust manifolds are transferring heat to the y-pipe and the gases are still combusting, but there's no silencing going on. So there's little backfires and popping all thru the system.
On the other hand, if there's intense popping that's occuring under heavy acceleration and it stumbles as it pops, then the timing is off.
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cbmoose
Dodge Dakota
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12/09/2002
20:42:37
| RE: Please For The Love Of God HELP!!!
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Intense Dak, I was under the understanding that the MAP sensor's job was to measure the manifold's absolute pressure (14.7 psia at average sea level) and input the information to the computer, so that the correct fuel ratio will be maintained no matter what the elevation of the vehicle. You may be right, since the pressure vs. throttle position can be used to determine bulk air flow. But the way I've always read it was that between the O2 sensor, the MAP sensor, and the throttle position sensor, the fuel/air map is manipulated to keep your engine at its cleanest, most efficient operation whether you're slogging through downtown Sacramento (el. 50 ft) or blasting I-80 over Donner Summit. (el. 7000+)
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IntenseDak39
*GenIII*
12/09/2002
20:53:45
| RE: Please For The Love Of God HELP!!!
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you are probably right about it trying to run clean... thats why we relocate iat sensors and adjust tps' to .75. But the computer will learn. Drive a vehicle in southern texas for a while.... then take it to colorado... it takes it a while to adjust to the less dense air at higher altitudes. That would be the map sensor doing its work. I know what you are getting at with the map vs. maf thing and i agree... i think that a maf would be better, especially in boosted aplications.
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ray
Dodge Dakota
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8/11/2005
13:54:25
|  blower motor on 1994 dodge dakota
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my heater and a/c blower has quit working. I have been told that there is a resistor located under the hood that could be bad. I have looked and think that I have found it. It has a part # 4462844 on it and I was wondering if this was it.
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