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derek
Dodge Dakota
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12/05/2006
23:18:12
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 Subject: need help with 1999 RC 3.9
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This has been ongoing for a year now but it has gotten really bad now. When I first start up the truck it studders really bad and my intake is making a really loud sucking noise like as if the truck was a vacuum cleaner sucking in air. This isn't too bad until I put it into gear and start to go, it won't even move like as if all the horsepower was taken away. The more gas I give it the slower it goes and it use to work when I floored it that it would shoot off and be fine but now when I floor it, it almost dies and the engine shakes really bad. I thought it was something to do with the vacuum line but now I have no idea. Also when I start to give it a lot of gas there is a ton of backfiring coming from inside the engine compartment. I'm clueless as to what it could be, usually when something goes wrong with it I can fix it. I have replaced the rear speed sensor in the diff., new muffler, new intake, new spark plugs, new EGR valve, new spark plug wires, new rear oxygen sensor, new alternator, new battery, new water pump, new belt, new tensioner, new fan, new PCV valve in which all of these things have not corrected the problem. When the engine is fully warmed up though it does stop the problem but until it gets to its normal operating temp. of 200, it studders and bogs down like crazy. It is a 2WD automatic btw if that helps. I have taken it to the dealership and they "could not" replicate the problem and took $80 from me for nothing, so instead of going back to them I am making a post here since y'all have helped me on other problems with my truck like my balljoints. Any help will greatly be appreciated, thanks-Derek
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screwuphead
Dodge Dakota
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12/06/2006
05:10:51
|  RE: need help with 1999 RC 3.9
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i had the same problem there for a while, i dont remamber where its at but theres a post on here how to clean your throttle body. I had the somewhat of the same problem and i cleaned my throttle body and i havnt had a problem since.
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Derek
Dodge Dakota
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12/06/2006
08:26:54
| RE: need help with 1999 RC 3.9
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I already had the throttle body cleaned out with BG at my work, the whole kit. Or does that not clean out the throttle body all the way?
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DakKink
Dodge Dakota
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12/06/2006
10:38:03
| RE: need help with 1999 RC 3.9
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I had this problem with an olds some years back. My problem was the fuel pressure regulator. I am pretty confident our truck would have one as well maybe just called something different. It does relate to vacuum. Other than that the only other thing i could guess is that you have some sort of leak in which you are getting too much air and bogging down the motor. let us know what you come up with.
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daddio
Dodge Dakota
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12/06/2006
10:49:37
| RE: need help with 1999 RC 3.9
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did you check for stored codes? that would be a good starting point.
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Derek
Dodge Dakota
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12/06/2006
17:35:41
| RE: need help with 1999 RC 3.9
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yes I checked the stored codes and nothing is showing up and as for the fuel regulator, how often do you have to change it? The truck has only like 91,000 miles on it and I didn't think it would have to be changed until at least 100k miles
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Kowalski
GenIII
12/07/2006
07:25:31
| RE: need help with 1999 RC 3.9
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How did you check the codes ?
Lead, follow, or get out of the way
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Derek
Dodge Dakota
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12/07/2006
17:29:03
| RE: need help with 1999 RC 3.9
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at my old job, we hooked up our technicians scanner to it to check it, no it wasn't some autozone, it was about a $800 scanner
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OBIO3
Dodge Dakota
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12/07/2006
18:07:12
| RE: need help with 1999 RC 3.9
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I didn't see where you checked the air cleaner and for that matter the whole intake system. That sucking sound is the engine desperatly trying to breath. Take the whole air intake apart and go through every part very carefully. Also make sure something didn't break off and is in he throttle body or elsewhere working like a flap.
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daddio
Dodge Dakota
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12/07/2006
18:46:46
| RE: need help with 1999 RC 3.9
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you didn't list the cap, rotor or plug wires. have you changed those also? and how can you change the EGR on a '99 when it doesn't have one?
you could have crossfiring between the wires or inside the cap if they are worn.
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Derek
Dodge Dakota
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12/07/2006
23:23:11
| RE: need help with 1999 RC 3.9
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OBIO3, I put a aftermarket K&N air filter on it and cleaned it not too long ago. As far as actually taking apart the intake system I haven't done that in awhile, not since I put my throttle body spacer on it. I guess I am going to have to take it apart to clean it really good.
daddio
the spark plugs are brand new and the wires I changed out like 10k miles ago. I don't see the cap making a backfiring noise though. It is definitely something with the vacuum. For the EGR, I could have sworn that is what I changed, it was something to do with the vacuum and it was on the driver side of the engine close to the firewall.
I just checked out a website that talked about the Dakota engines were known for having vacuum problems with the manifold itself on the inside. Some plate warps overtime and causes it to have a vacuum leak, could this fix the problem if I change that plate? Where is the plate in the manifold and where can I get a kit to change it? That might be where the backfiring is coming from, idk.
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Mike Stager
Dodge Dakota
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12/07/2006
23:48:18
| RE: need help with 1999 RC 3.9
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I'd be willing to bet you have an intake leak, either from the pan gasket or at the intake gaskets themselves. The intake is barrel shaped, and when you pull the intake off the engine, you will notice a large plate bolted to the bottom of the intake.
What's probably happening is that plate has warped or loosened up, and when the engine comes up to temp, the metals expand enough for your engine to run. In the mean time, it's sucking up so much air that it is running too lean, which won't allow the engine to run at all at idle speeds.
The colder it gets outside, the harder it is for the truck to run I'd bet ( if you live up in the hinterlands like I do....currently about +1F )
If you can't pull a code, then the best thing to do is to get a vacuum gauge and check the engine. The vacuum gauge can show you things like intake leaks, burnt valves, etc that won't necessarily show up as a code, or may set a code for a sensor that isn't related to the actual problem...ie, a piston slap that sets off the knock sensor.
If you have a haynes manual ( any one will do, this part is in all of them ), go to the 2nd chapter titled " general engine overhaul procedures " and read the section on vacuum gauge diagostic checks. You'd be amazed at how many things you can find out about your engine with a $40 hand operated vacuum pump w/gauge.
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stevedak
Dodge Dakota
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12/08/2006
09:16:38
| RE: need help with 1999 RC 3.9
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I had the same problem, it was my Idle control solinoid. Try this. Take off the air cleaner. The idle controller is at the back of the throttle body. With the truck running, put you hand over the rear portion of the throttle body where the idle air comes out. If the noise changes or quiets when you put your hand over idle air outlet, then change the idle controller. My idle controller was stuck open yet idled fairly decent and didn't throw a code. This takes 5 minutes.
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