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Trev1
Dodge Dakota
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10/05/2007
20:22:56
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 Subject: RE: Will it Break?
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Never thought of that one...Ill have to sleep on this one to get any more ideas...
Trevor in SWMO.
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dakota49
Dodge Dakota
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10/06/2007
10:53:03
| RE: Will it Break?
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I'm not sure about the oil pressure switch not allowing the computer to send fire to the coil. I think the oil pres. swch. only shuts off the fuel pump in case the engine stops and there is a leak in the fuel system. That would be in the case of an accident. So it wouldn't feed the flames, if there were any. I would check the wires from the coil, and if nothing else he could run a wire from the pos. post on the batt. to the coil pos and see if that would at least make the coil fire. Only, with mine (an 88) I can check my coil like that, the second gen. it may not work. I think he has done most of the first checks, like the grounds, ect. The only thing I'm wondering about is the computer, because if it is bad, in most cases it will still let the engine run. Like the limp mode to get it some place to have a shop look at it.
I've worked on a lot of GM stuff, and when the computer goes bad it will still run and give all kinds of codes. Oh yeah though it will still run, they would run really bad.
Toby, keep us posted, I think it may be something fairly easy, but not sure.
Another thing to check the timming chain, turn the engine by hand, (a socket on the balancer bolt) and put the timing marks on 0, then with the dist. cap off, have someone watch the rotor and turn the eng. backwards and see how many degrees it moves before the rotor moves. IF the eng. goes more than 12-15 degrees before the rotor moves I would replace the timing chain. I have seen engines run with more than 15 degrees streach but they were very hard to get started and really ran badly.
Sorry friend, but that's all I can think of for now.
Good Luck
Dakota49
1988 3.9 4X4 5speed
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daddio
Dodge Dakota
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10/06/2007
11:22:07
| RE: Will it Break?
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dak49, you're right. the ASD only cuts the fuel. must have had a brain fart there. you do have a good idea about firing the coil straight from the battery. the thing to do would be to trace power from the coil back through the wiring harness to try and find a break or something.
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TobyWD40
Dodge Dakota
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10/06/2007
14:56:19
| RE: Will it Break?
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Ok Guys, I guess if we get through this one we will all know something new. A couple of questions. 1. Is the test port on the fuel rail the black screw off thing on the Drivers side that looks like an AC filler connection, and you just screw it off and if there is fuel it will squirt out? 2. Mechanical gauge ,(like a pressure gauge) and where is oil pressure sending unit on my truck? I see a sensor thing that looks like a O2 sensor on the side of the motor with wires going to it, again on Drivers side lower engine. Is the oil pan under pressure when the truck is running? I don't think so but I am learning and wouldn't be surprised or does the sending unit monitor the oil pump pressure. I have this thing about knowing how things work to be able to fix them, sorry. Whoever it is that said ,"if it aint broke fix it till it is ", is like me. I always tear things down to figure them out. Thanks guys we need to have a convention or something, I almost feel like I know yall already. Thanks
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daddio
Dodge Dakota
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10/06/2007
17:10:50
| RE: Will it Break?
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1) yes, that is the test port. and no, if you take the little black cap off it will not squirt fuel. unless of course, you depress the little schrader valve.
2)you're gonna love this! the oil pressure sending unit is on the back of the motor, right next to the distributor. has a little 1 wire connector on top.
the oil pan is not under pressure. it's just supposed to be full of oil! LOL just kidding. hope we figure this one out soon.
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TobyWD40
Dodge Dakota
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10/06/2007
18:06:47
| RE: Will it Break?
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Thanks Cajun
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Trev1
Dodge Dakota
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10/06/2007
20:09:00
| RE: Will it Break?
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The oil sending unit is right beside the dist. To the left as you are straddled the mtr. The clip to release the connector on mine is facing the intake. A real PITA to get to. The wiring on mine goes down next to the trans into a large bundle. This is not a fun one to get to.
Hope this helps...
Let us know how it is going..
Trevor in SWMO
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dakota49
Dodge Dakota
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10/06/2007
20:33:39
| RE: Will it Break?
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Daddio, mine has 3 wires on the oil pressure switch, I think one is for the pressure gauge, the fuel pump, and I'm not sure what the last one is for, but I think it may be for ground.
Dakota49
1988 3.9 4X4 5speed
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shadetree
Dodge Dakota
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10/07/2007
10:15:45
| RE: Will it Break?
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I would say the sensor probably grounds throught the body of the sensor to the block. I would tend to think that one wire is a 12v source one wire runs back to the gauge on the instrument panel and the other goes to either to that asd or the commputer to shut off fuel. Im not possitive but thats what i would assume.
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dakota49
Dodge Dakota
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10/07/2007
19:40:20
| RE: Will it Break?
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shadetree, you are right, one is for the fuel pump, the dash gauge and one for the volts.
My manual doesn't show the wiring for the oil press. sensor so I am just guessing, but it does make sence.
Dakota49
1988 3.9 4X4 5speed
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shadetree
Dodge Dakota
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10/08/2007
07:40:18
| RE: Will it Break?
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The manual I have dodge manual and doesnt have alot on dakotas. It actually only shows 2 wires running to to the sensor and the third wire for the fuel pump looks to be a printed circuit on the back of the instrument panel. The book covers 94-01 but the basic circuit should work the same way.
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TobyWD40
Dodge Dakota
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10/08/2007
09:02:03
|  RE: Will it Break?
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It's pretty clear since it was running great and just died it's got to be something loose, old, or circuit related. After reading all everyone says, It's really just a motor with several things feeding it. I'm feeling pretty spunky this morning , all I have big enough to fit the bolt between the fan and engine is a large crescent and it don't fit, so for now I'll unwrap wires. All the harnesses are decaying anyway and need to be done. I hope the Haynes book that's coming has a vacuumm line schematic. They all seem intact but are old and I'm curious about what they all do. Once I figure out more about the wiring as it relates to the computer I think I'll understand a lot more of how she ticks. I'll keep yall posted as I go today, if I don't get hung in the motor or something, it's a beautiful morning to be ALIVE! Thanks for being around everyone. Toby WD40 is a good skin lotion and Hair Tonic Ha!
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Scottin NC
Dodge Dakota
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10/08/2007
12:01:52
| RE: Will it Break?
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I noticed you said it just died. I may have overlooked some thing in the thread, but I personally have a "89 3.9 that just died one day on me.Intermittent running, all the fun none of the Go...(1) Carefully inspect the two small ground wires(thin Black w/stud terminal) that attach to the Intake Manifold. They go to the TBI injectors(on my 3.9 anyhow)
(2) The relay for the fuel pump (on the drivers fender, has a Large green wire in connection plug
could be bad (mine had a bad connection@ plug)
Alcohol on a Q-tip does wonders....
Both of these areas aren't covered in depth in the manual.. If it helps, it does....Good Luck
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Trev1
Dodge Dakota
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10/08/2007
15:30:59
| RE: Will it Break?
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Got it fixed yet Toby?.....Count yourself lucky. I was bleeding the brakes on the father-in-laws p/u sunday afternoon.(he was pumping the brakes) When his p/u threw a rod. I was right under the left front right under the mtr when it happened. Sounded like a sledge hammer beating on a RR track. REAL LOUD!!!!!
His mtr is only good for a trot line weight.
YEP IT WILL BREAK...
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TobyWD40
Dodge Dakota
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10/09/2007
14:06:18
| RE: Will it Break?
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Hey Trev, At least he can't blame you, bleeding brakes is a ways off from a rod, Was the engine just idling. Fingers OK I take it? I'm having to take the tape off the wires like I was preserving a D Mummy, It's rotted to almost dust. I need to go look around Auto zone For the split tubing stuff it's rotted too. Might just use pipe wrap so it will look coooolll HA!, I see the wires your talking about must be pretty close to yours then. I found the deal on Autozones sight showing where everything is located, nice to know what all this --- is Ha!. I found out that their going to put Oriely's parts store here, hope they are good and will test stuff like Autozone. Thanks Toby
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TobyWD40
Dodge Dakota
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10/09/2007
14:33:14
| RE: Will it Break?
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Hey Scott in NC, I thought trev told me to check wires, I saw the ground wires so mine must be close, but the wire on the relay is Dk blue on mine. I'm tearing all the junk off all the wires I can it's rotted. I'll have it going soon, Half the fun is the tinkering and bitchin, Ha! We have folks in Mt. Airy. Thanks for posting, Toby WD40
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Trev1
Dodge Dakota
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10/09/2007
18:15:09
| RE: Will it Break?
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Wal-Mart has the plastic split wire covering that you are looking for. I believe the price is cheaper(more reasonalbe) than the auto parts store. I Need to do the same as you are doing. It must be a Dodge thing with the wiring harnesses decaying as they are. If I were you I would un-rap check the wiring one bunch at a time. Then try to start her up. That way you can keep track and trouble shoot easier. If she starts after a single bunch, then you got a starting point to find the gremlin that has made all of us think and give us headaches so much!
Nope the fingers were a LONG way away. Nope it's not my fault! It was just idiling and WHAM WHAM WHAM KNOCK KNOCK KNOCK KNOCK KNOCK KNOCK oil was at 50 psi although it had 235,000+ on it. Has terrible blow-by and pinged constantly.(He's not a mechanic at all). Gas oil and drive her. Hes a good man and has had terrible luck.
Keep us appraised as to how it's going. I am anxious to find out what is. Probaly not as much as you.
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TobyWD40
Dodge Dakota
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10/10/2007
12:03:49
| RE: Will it Break?
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I guess I'd better get it fixed or my wifes gonna sell it, she doesn't appreciate the learning experience I'm getting, just thinks I'm trying to avoid other jobs HA!
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stevedak
Dodge Dakota
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10/10/2007
13:13:51
| RE: Will it Break?
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Toby...I had a similar problem. Mine didn't dye while driving, mine wouldn't start after being driven, if it did start, it ran perfectly. I too changed CPS, hall effect sensor, ASD, checked grounds and re-solder all wire splices, cleaned pins/connectors, check fuel pump...still no fix. I checked the battery voltage before cranking and found it low (11.5V) but the starter cranked fine, over and over but no start. One key item is that the fuel pressure was low due to the ASD, fuel pump and coil circuits were not getting energized. When it did start fuel pressure was fine, i could jump a 12v wire to the fuel pump and hear it run.
There is a "ign feed" wire that goes from the ASD circuit to the PCM, I guess (its only a guess) this tells the PCM something so it can start. I figure this signal needs to be 12V before the truck will start.
Anyway, even though my starter was cranking like crazy, I decided to jump it with cables and my car. The truck started right up, this after being hard-failed for 10 days. My battery tested good at autozone but I replaced it anyway with a new battery. The trucks been running great ever since. If you can bypass the ASD and it starts, check out my theory.
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TobyWD40
Dodge Dakota
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10/10/2007
16:59:40
|  RE: Will it Break?
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Hey Steve, Your sayin that the ASD wasn't bad but the Battery wasn't holding a full 12 volt charge so the signal to comp. from ASD was showing a low voltage condition or something like that. If You went around ASD it would start.
Mine is a 92 so the ASD is on the drivers side in a box with fuel pump, AC relays and some other fuses. The Comp. is on the pass. side, 60 pin plug going into it. Is this your setup I can't remember your truck, if this is the same how did you jump wire around ASD? Thanks, Toby
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