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#313226 - July 29th 2009 3:30 pm Dodge B250 3/4 ton 5.2L Help?!?!?
1990dodgeB250van Offline

Registered: July 29th 2009 12:55 pm
Posts: 4
OK...I drove my 1990 dodge van to town a couple days ago. When I got home I shut the van off and noticed that my fuel pump was still running. I turned the key on/off couple times and it kept running. I started it and shut it off and it continued to run. I unhooked the negative battery cable and hooked it back up and it stopped running. I drove my van to town the next day it started and ran fine. When I got home I shut the van off and everything was fine. Today I went out to try to start my van and all it will do crank over, but it will not start. I noticed I dont hear the fuel pump come on like it usually does when I turn the ignition to the on position. I tried to put gas in the top of the intake and start it that way. It wouldnt start. I pulled a plug off and tested to see if it had spark no spark. We replaced the coil which tested the same as the old one reguarding resistance in ohms. I have power to the coil so I dont think its the auto shutdown relay. And I dont think its the ballast resistor. (which I cant find) When this van is running it runs great. Engine purrs like a kitten. Any ideas why its not wanting to start now? Would a bad fuel pump stop spark? Any ideas?

#313231 - July 29th 2009 3:40 pm Re: Dodge B250 3/4 ton 5.2L Help?!?!? [Re: 1990dodgeB250van]
vanatic05 Offline


Registered: June 02nd 2005 12:00 pm
Posts: 5145
Loc: Auburn IL
Could be bad ignition switch?
Darrin Bentley
Director: Vanatics Van Club
Member of Bad Boys of Illinois
92 GMC 3500 454/4bbl
Partner on Project 2nd Generation

#313233 - July 29th 2009 3:42 pm Re: Dodge B250 3/4 ton 5.2L Help?!?!? [Re: vanatic05]
1990dodgeB250van Offline

Registered: July 29th 2009 12:55 pm
Posts: 4
would that stop the van from turning over? Cause it turns over like a madman lol

#313255 - July 29th 2009 4:41 pm Re: Dodge B250 3/4 ton 5.2L Help?!?!? [Re: 1990dodgeB250van]
NateNCBV Offline


Registered: August 23rd 2005 12:00 pm
Posts: 20415
Loc: Brooklyn Park, Maryland, USA
I'm thinking it's the computer (aka ECM or SBEC). Unfortunately that era (1988-1991) of Chrysler engine computers left a lot to be desired.
Nate Breece (Nate the skate)
North Chesapeake Bay Vans
A-100 Van Association
Honorary Canadian(You Hoser!)
1994 Dodge B250 Elk Conversion (5.2L/A518)
1985 Dodge B150 "Burnin' Desire" (5.2L/A727)

#313322 - July 29th 2009 7:32 pm Re: Dodge B250 3/4 ton 5.2L Help?!?!? [Re: NateNCBV]
1990dodgeB250van Offline

Registered: July 29th 2009 12:55 pm
Posts: 4
So kept looking at stuff on the net today. Was looking at a code scanner and found out it was $199 dollars I quickly went looking for other brands of OBD1 scanners. Doing this I found out I could turn my ignition on/off/on/off/on and the check engine light would flash the codes to me for free... nice little trick. Apparently its giving me a 42 and 45 code. codes listed here

45 Turbo boost limit exceeded (engine was shut down by logic module)

42 Automatic shutdown relay circuit open or shorted
42 Fuel pump relay control circuit
42 Fuel level unit - no change over miles
42 Z1 voltage missing when autoshutdown circuit energized (SEE NOTE #6)

NOTE #6.The Z1 voltage is the voltage of the circuits fed by the autoshutdown relay. This typically includes fuel pump and switched-battery feed to the ignition coil(s). In my Le Baron, the Z1 circuit leaves the power module and splits into two paths: the fuel pump and the positive side of the ignition coil. Internal to the power module is the auto shutdown relay (in my case, it's a sealed box about 1" by 1"). The output voltage is monitored to determine whether the relay responds correctly. I suspect that the ASD relay (and, therefore, the Z1 circuit) also feeds the fuel injector(s) driver(s) and current sensing circuit, but can't prove this.
I've used the Z1 voltage to test for good power connections to the power module. I connected my OTC 500 multimeter from the battery's positive post to the ignition coil's switched battery terminal and measured the voltage drop using the bar graph to monitor peak voltages. Voltage spikes of around 200 mV to 300 mV are ok -- anything more means tv tuner cleaner time (or replacing the power module). Another thing to check is the maximum voltage drop during the priming pulse. With the old power module, I was losing about 2 volts across the circuit; the replacement is losing about 1/4 volt. (Thanks, Bohdan Bodnar)
Unconfirmed correction: The Z1 Circuit is used to feed the engine computer; if it is lost, the delayed turnoff will not occur, and restarting will not go well. I forget but think it is the engine flair (speed flair up upon starting) that is lost. It also feeds the injectors and solenoids and other relays. (Thanks, Tom Wand)

Any idea what the diagnosis is? Bad fuel pump? Bad autoshutdown relay? Bad fuel pump relay?

#313697 - July 30th 2009 4:53 pm Re: Dodge B250 3/4 ton 5.2L Help?!?!? [Re: 1990dodgeB250van]
1990dodgeB250van Offline

Registered: July 29th 2009 12:55 pm
Posts: 4
beer ahhhh time for celebration. Pulled the auto shutdown relay. Got to looking at it and it was not attached to the firewall anymore... Anyways turned it upside down and rusty water came outta the bottom. Anyways I took the relay apart. Sprayed it off with some corrosion wash let it dry off real good. Took some sand paper and sanded the contacts. Put it back together and put it back in. BOOM! fired right up... Runs great once again. Going to get a new auto shutdown relay tomorrow $29.99 Thanks for your help! Off to town I go lol LATER!

#313709 - July 30th 2009 5:13 pm Re: Dodge B250 3/4 ton 5.2L Help?!?!? [Re: 1990dodgeB250van]
Ram4ever Offline

Registered: March 26th 2007 8:05 pm
Posts: 3662
Loc: Dundee, Michigan
Good going!!

Doesn't it feel great when you bring another one back from over the edge?

Is there any way you could install a clip-on splash cover over one of these? I found an original cover for my starter solenoid from a couple years newer van in a yard, and it fits great.

Clear skies!
-It's been such a LONG TIME... 1981 Dodge Ram B250 Custom Sportsman Maxi Van

Bringin' her back - the construction never ends!

It's what you learn after you know it all, that counts...

Are you living to work, or working to live?

#313737 - July 30th 2009 5:57 pm Re: Dodge B250 3/4 ton 5.2L Help?!?!? [Re: Ram4ever]
Scrotor Offline

Registered: March 09th 2006 12:00 pm
Posts: 276
Loc: sacramento
It's times like these in which ya wish you could pop wheelies in a van.

Edited by Scrotor (July 30th 2009 5:57 pm)
Dodge B-100 Panel 72-75 Manual/6-Cyld

#314505 - August 02nd 2009 5:23 pm Re: Dodge B250 3/4 ton 5.2L Help?!?!? [Re: Scrotor]
Superbeast Offline


Registered: October 25th 2001 12:00 pm
Posts: 28121
Loc: Dayton, New Jersey, U.S.A.
Originally Posted By: Scrotor
It's times like these in which ya wish you could pop wheelies in a van.

I'm working on one that will hopefully do that shift
Ken Schwarz
Tricky Truckers, N.J.
Van Clan Plus One, Canada
Manse Vans, Finland
Rebel Vanners, N.J. "USA"
Toopa Sinner Tribe, N.C.

"Coolness ALWAYS trumps comfort"


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