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Low voltage to hall effect and coil

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  #1  
Old 12-19-2008, 04:36 PM
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Default Low voltage to hall effect and coil

I have a 1988 Ram w150 318 w/tbi. It was was running fine then started to sputter then died and won't restart. It tries to start but sounds like it's only firing on 2 cylinders. I replaced the hall effect and coil with no results. I checked the voltage to the hall effect and coil and they're only getting 9.5 volts. Spark is yellow. After this I replaced the body ground with still no luck. Engine has good ground. Computer is not original, was replaced sometime before I bought the truck. Any help would be appericated. Thanks.
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  #2  
Old 12-19-2008, 07:41 PM
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ballast resistor?
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Old 12-19-2008, 07:55 PM
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No ballast on an '88. Everything gets it's juice through the ASD relay,the computer grounds the neg. side of the coil when it receives a signal [change in resistance] from the hall effect. Check upstream and downstream of the ASD,see if there's 12v to/from the relay. Let me check my FSM. Think there's only supposed to be 5v to the hall effect best as I remember.
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Last edited by lugnuts; 12-19-2008 at 08:01 PM..
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Old 12-19-2008, 08:40 PM
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According to the Haynes manual and a mechanic at the local Dodge dealer, the hall effect is supposed to be within 1 volt of the battery to opperate correctly. As far as I know their is no crank sensor on my truck, so I'm unsure if it even has an asd relay because it has tbi instead of mpfi which has a camshaft position sensor that uses a 5 volt signal. The book says nothing about the asd relay. If you could tell me where it's located, I'll check it. Thanks for the help.
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Old 12-19-2008, 09:01 PM
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All I can find is my '89 book. Let's back up a minute. Is the battery at 12v or 9.5? Should be 5v supply to the hall effect. The 5v supply also feeds the map,tps etc, see if you have the same voltage on the blk/lt blue wire at the tps.
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Old 12-19-2008, 09:05 PM
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Wanting to verify the 5v circuit isn't shorted.
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Old 12-19-2008, 09:23 PM
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Battery is showing 12.4 volts. As I said in my last post, a Dodge mechanic and the Haynes manual both say the hall effect runs within 1 volt of the battery voltage on TBI systems. The ignition coil is also only showing 9.5 volts, like the hall effect. If it had a camshaft position sensor, like the MPFI equipped models have, it would be 5 volts. The computer is showing 12 volts at the power input. Could it be the computer is bad? The original hall effect was shorted out by the previous owner leaving a piece of metal in the distributor housing, which i found when I pulled the cap. TPS checked out for 5 volts, I thought the same at first. Thanks.
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Old 12-19-2008, 09:39 PM
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I look at it this way, if all else fails it's time to pull out the electronics and drop in a point distributor and a 2 barrel Carter.... lol
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Old 12-19-2008, 09:42 PM
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Wiring diagram shows a 5v reference. Tell you what, just so happens I have an '88 318system on my '86 Ramcharger. Let me do some comparing voltages to yours tommorow,see what mine has where. Fair enough?
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Old 12-19-2008, 10:00 PM
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Thanks lugnuts, I really appreciate all the help. Just got this thing 3 weeks ago and have come to the conclusion I inherited someone elses headache. Rear axle still needs to be rebuilt from someone beating the old yoke off with a hammer and blowing the input bearing and seal, then driving it with no fluid. Gotta get this thing fixed. Gotta plow the driveway somehow and the snowblower ain't happy with me lately either... lol
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Old 12-20-2008, 12:21 PM
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Sounds like what I started with. Burnt motor,trans,both axles,all the u-joints,drive shaft angles, fried wiring,brakes shot,busted up doors. Had a good transfer case though. Guess you could say I started in the middle lol.
It'll be this evening before I can check stuff out, gotta go get the wife's new furniture she's gettin' for Christmas. So much for my aluminum heads. Ah well, don't **** off the cook right?
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Old 12-20-2008, 11:17 PM
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Red, my apologies. Didn't get back from town until after dark,so I don't have those readings for you. Will get 'em in the morning gauranteed. In the mean time I've looked the wiring diagram over some more. The main components on the ASD are the injectors, fuel pump,coil+,and o2 sensor heater. Also one unspecified dk grn/blk goes from ASD to computer.

On the hall, two wires straight to the computer, one orange,one gray. Third wire is black/lt blue ties in with the various sensors,also goes to computer. I'd start checking voltages up and downstream of the ASD. If the ASD dk blue/black has full batt voltage where it leaves the relay, see what you read at the injector +. The computer should unlatch the ASD 5 sec after turning the key on unless the computer sees a crank signal.
If your reading voltage all the time I'd say you have a short, bad relay,or fried computer.
Just a guess though. Hard to say from 900 mi away lol.

Just for grins have you seen what voltage is at the fusebox? Something corroded at the fuse links or battery feed wire maybe? Fuse link feeds the ASD too.
I think there's also some grounds on the firewall close to the bulkhead connector.
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Old 12-21-2008, 02:29 AM
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Thanks for the info. No prob on not getting back sooner. I'm just happy someone is willing to help me with this. I'll check that stuff out that you mentioned. I owe you a couple beers if we ever run into each other. Hope your wife likes the furnature. lol If the comp is fried I'm dropping in a point distributor and a 2 barrel. A new comp for it is just way too much money, and the numbers on the tag are not readable anyway so it would be hard to match up a replacement
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Old 12-21-2008, 01:48 PM
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Make it three beers, it was 19 deg. and a 20 mph wind. Tough on the desert born lol.
OK the voltages on mine are as follows:
Looking at the harness end of the dist plug, with the flat on bottom-

Lower left term. gray/blk 5v
center term. orng 9v
lower right term. blk 0v
coil + 11v
My battery shows 12.0 volts

Hooking a jumper between the bat+ and the coil + with key off I had 0v on all three. Voltage is only available with the key on. Run a jumper to coil+ with the key off and see what you get. If it's 0 chances are the circuit's OK. While you have the jumper hooked up see if it'll start. One thing about it, I found I have a leaky injector from running the jumper. No wonder the damn thing's so thirsty.
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Old 12-21-2008, 11:49 PM
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Thanks for checking that for me. Been busy all day hanging drywall so I've got a full morning of tests and swearing when I work on the truck. lol You wanted 3, make it 4 beers for going above and beyond the call of duty. I'll let you know what I find out tomorrow.
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Old 12-22-2008, 10:33 PM
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Watcha sheet rocking? Just redid our living room,so been doing some myself. About finished need to touch up some paint, have 2 peices of trim to make yet. Glad it's almost over.
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Old 12-22-2008, 11:21 PM
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Well, it's the computer. Damn thing pulled a Ford on me. lol I've been remodeling a polebarn into a house. To make a long story short, we lived near Detroit, lost my job and our house so we moved up north onto my parents property. Thank god for them or my wife and I would be screwed. Tomorrow I pick up the new distributor and I've already got a carb. I'll let you know how it runs. Thanks for all the help.
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Old 12-23-2008, 12:02 AM
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Hate to hear about your job and home. That just sucks. Been slowing down here a little too since oil prices slid. My job is fairly secure thankfully. A lot of pumps here to work on and they have get rid of their produced water somehow. If they'll give me 5 more years I'll have this place paid for. Good luck to you and the wife, maybe it'll turn around soon.
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Old 12-24-2008, 01:13 AM
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Thanks Lugnuts, the luck is getting better. Good to hear your job is secure. This economy is a bad joke at best. lol I didn't get a chance to wrench today, got too busy with Christmas and all, shopping shopping shopping. I'll be swapping out parts on the mighty Dodge in the morning. I hope you and your family have a Merry Christmas, talk to you soon.
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Old 12-27-2008, 11:01 PM
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I got the point distributor in, fired right up with some starting fluid but I couldn't get the TBI to work. I was still waiting on the parts store to get the adaptor plate in for TBI to carb conversion, but cuz they're too slow for my blood, I ordered it from Summit. I'll have it January 2nd. Parts store gave me my money back thankfully cuz they didn't know when it would be in.
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Old 12-27-2008, 11:01 PM
 
 
 
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12, 2000, camshaft, computer, dodge, durango, effect, hall, ignition, input, low, module, needed, positioning, resistance, sensor, voltage

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