92 stalling and rough idle
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92 stalling and rough idle - 5/20/2006 10:51:43 PM
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erock92kota
Posts: 200
Joined: 5/20/2006
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Hello, I have a 92 dakota that has a 3.9l swapped into it. This thing used to run great. Lots of power and no issues what so ever. Now sometimes its a pain to start, will start then stall, and every now n then it backfires, and if I let it run for a lil while it will devlop a rough idle. I changed the cap,rotor,wires,plugs,air filter,fuel filter, cleaned the throttle body, cleaned and checked the egr system, gone over the wiring with a multi meter and a visual inspections, and replaced a couple vacuum lines that looked shady and triple checked the routing. I also then regapped the plugs I just put in to make sure I didnt screw that up. But it still does it.
Any Ideas?
The only thing I can think of are that stupid hall effect pickup or the fuel pump is crapping out. But maybe someone else knows before I go buy parts.
Thanks
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RE: 92 stalling and rough idle - 5/21/2006 12:17:44 AM
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dodgerules86
Posts: 2704
Joined: 12/25/2003
From: Sycamore, Illinois (displaced to Arkansas)
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First things first:
You made sure the spark plugs have a .035 inch (.89mm) gap, I hope, if you verified and/or changed that as needed before putting them in, there's no need to pull 'em out to check.
However, DO double check to make sure the plug wires are routed properly (refer to the good ol' paint drawing picture given) (I made this mistake, I swear I double checked to make sure each wire was going to the right plug, but, I was wrong) (while your at it, also double check the rotor and cap)
Also maybe check for error codes.
Other than that, I could only suggest vaccum lines (which you said you were careful when you replaced, and double checked) or bad fuel (I don't know, maybe?)
Of course, I am not that experianced with cars.
*As far as the fuel pump crapping out, you can find a fuel pressure gauge to hook up, and watch that*
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*hope your cylinders don't look like they do in the pic, lol*
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< Message edited by dodgerules86 -- 5/21/2006 12:19:02 AM >
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RE: 92 stalling and rough idle - 5/22/2006 5:24:39 PM
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erock92kota
Posts: 200
Joined: 5/20/2006
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Well today I figured it out. It was the hall effect sensor under the dist. cap. Nice. But its all better now.
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RE: 92 stalling and rough idle HELP! - 5/28/2006 8:50:47 AM
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erock92kota
Posts: 200
Joined: 5/20/2006
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Ok well I thought it was fixed. When I first start it when its cold, it fires right up and runs perfect for a little while then it starts to stumble and backfire out the exhaust. If I try to give it more air to keep it running it wants to shut off and start backfiring out the trottle body. Lack of fuel? Maybe my fuel pump is crapping out? Any suggestions? I am at a loss. It will restart after it starts doing this but it will still backfire and run like total crap. If I try to move it, it just dies. No check engine light has come on so far and I have tried to pull codes and all I get is a bettery has been dissconnected recently and a 55 which I believe is end of codes.
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RE: 92 stalling and rough idle HELP! - 5/28/2006 11:41:23 AM
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Bad96_3.9
Posts: 408
Joined: 5/8/2006
From: Crawfordville, FL
Status: offline
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Have you checked the timing?????That could be the problem.
_____________________________
1996 Dakota Club Cab 2wd SLT
Spray in Bed Liner
Custom Racing Stripes
3.9 to 5.2 Conversion!!!
Mopar Performance computer, K&N, flowmaster, no cat.
http://www.myspace.com/topher73
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RE: 92 stalling and rough idle HELP! - 5/28/2006 1:44:45 PM
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erock92kota
Posts: 200
Joined: 5/20/2006
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Timing is dead on, I thought the same thing. Thanks for the input tho. I pulled the plugs again. They were covered in gas. I'm wondering about the vacuum lines. Anyone with a diagram handy? The one under the hood is for a 2.5l not the 3.9l thats in it.
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RE: 92 stalling and rough idle HELP! - 6/12/2006 6:33:52 PM
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erock92kota
Posts: 200
Joined: 5/20/2006
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Hello. I am still looking for that diagram if someone has it handy. I have a 94 3.9l v6 in my 92 dakota. Ive got so many people completely baffled with this thing. But at least I have it the point now where it runs for a lil bit then it just shuts off like someone turned the key off or...it spits sputters and stumbles itself to death. Nice.
So far I have changed plugs..wires..cap..rotor...crank sensor...map sensor..tps...iac....coolant sensor.... hall effect sensor(the one under the dist. cap). Fuel pressure is fine according to Mr. Mechanic and I have ripped the wiring completely apart and checked for shorts...bad connections etc.... had it hooked up to a diagnostic monitor and got alot of crazy erratic readings but no codes.......set the #1 cylinder at tdc on compression stroke and checked to make sure rotor lined up with it to fire and it does. I checked and rechecked all the plug gaps. The only thing that we got out of the diagnostic reader that my mechanic had was that the auto shutdown is killing it and he told me to just start replacing stuff to see what fixes it.....nice advice. So I got a second opinion...same thing. excellent!
So my guess is still with the vacuum lines or buy a computer. I had checked the vacuum lines before only to realize that the diagram under my hood is for the 2.5l engine that came in the truck...not the 3.9 thats in it now. So now they are pretty messed up. Some are still hooked up..others arent, I have been trying to trial and error this but its not working. Anyone have any other ideas it would be cool to let me know and it would be hellacool to get my eyes on a vacuum diagram. help would greatly be appreciated.
Thanks
Eric
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RE: 92 stalling and rough idle HELP! - 6/12/2006 9:50:17 PM
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dodgerules86
Posts: 2704
Joined: 12/25/2003
From: Sycamore, Illinois (displaced to Arkansas)
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The following vaccum diagram is from a 1996 Dakota with the 3.9L.
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Attachment (1)
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RE: 92 stalling and rough idle HELP! - 6/12/2006 10:05:38 PM
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erock92kota
Posts: 200
Joined: 5/20/2006
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Thank you....that is awesome. It looks about the same except the egr stuff is missing which is fine since the egr is gone on my truck and I have a set of exhaust manifolds that came off a 99 without the egr port on the passenger side milled out. But this is perfect. Thanks again.
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RE: 92 stalling and rough idle HELP! - 7/9/2006 7:04:39 AM
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shovlhead56
Posts: 4
Joined: 7/9/2006
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I,m not sure about the 3.9 but on the 5.2 this sounds like it could be the plenum gasket.I had 2 318's that did this and that was what it was.
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RE: 92 stalling and rough idle HELP! - 7/14/2006 10:22:36 AM
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erock92kota
Posts: 200
Joined: 5/20/2006
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Upon your reply, I pulled the intake off the truck. While I was removing it I noticed that an o-ring was missing from one of my fuel injectors. The intake to head gaskets seemed like they were sealed fairly well, although I didnt have to pry the intake off the truck. It just kind of lifted off. Some of the bolts werent all that tight either but its only supposed to be torqued to 12ft/lbs. I took the intake in to work and threw it in the parts cleaner and got all oil residue out of it. I havent had time to throw it back on yet. I hope to before the end of the weekend. I'll let yas know how I make out when its back on. But I'm not getting my hopes up.
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RE: 92 stalling and rough idle HELP! - 7/14/2006 3:40:28 PM
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gb6491
Posts: 98
Joined: 1/6/2006
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I just did the head gaskets on my 89 3.9L and needed to pry the intake manifold up to break the seal.
12 ftlbs. sounds light if we are talking intake manifold bolts; they are 45 ftlbs on the 89 and I would think the same for a 92 (verified 45 ftlbs at the Automotive Repair Reference Center).
Regards,
Greg
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RE: 92 stalling and rough idle HELP! - 7/14/2006 6:09:51 PM
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dodgerules86
Posts: 2704
Joined: 12/25/2003
From: Sycamore, Illinois (displaced to Arkansas)
Status: offline
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As per my 1996 service manual (and the 2001 as well):
The plenum gasket pan (if removed) bolts will be tightened, in sequence, as follows
(1) Tighten to 2.7 N*m (24 in lbs)
(2) Tighten to 5.4 N*m (48 in lbs)
(3) Tighten to 9.5 N*m (84 in lbs)
(4) Verify all bolts are at 9.5 N*m (84 in lbs)
Throttle Body bolts:
23 N*m (200 in lbs)
Intake manifold bolts:
(1) Tighten bolts 1 and 2 to 8 N*m (72 in lbs). Tighten in alternating steps 1.4 N*m (12 in lbs) at a time.
(2) Tighten bolts 3 thru 12 in sequence, to 8 N*m (72 in lbs).
(3) Check all bolts are tightened to 8 N*m (72 in lbs).
(4) Tighten all bolts, in sequence, to 16 N*m (12 ft lbs).
(5) Check that all bolts are tightened to 16 N*m (12 ft lbs)
Generator mounting bolts:
41 N*m (30 ft lbs)
Adjusting Stap Bolt:
23 N*m (200 in lbs)
Conversions:
in lbs x 0.11298 = N*m
ft lbs x 1.3558 = N*m
N*m x 8.851 = in lbs
N*m x 0.7376 = ft lbs
I wonder if the differance could be in the fact that the Dakotas from 1992 on have multi-port fuel injection, instead of throttle body?
Note: the manual says, "Apply a small amount of engine oil to each fuel injector o-ring. This will help in fuel rail installation."
Hope what your doing finally helps your dakota!
Post back if you need more info, or, when the jobs done!
_____________________________
Current ride: Belleville 220 DES ST - leather, reinforced front end, tan color. Runs on ''alternative fuel'' :)
1996 Dodge Dakota
1986 Honda Civic CRX
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