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Old 01-10-2009, 06:01 PM   #29
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1986 34.5' Airstream 345
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I borrowed an 'Auto XRay' code reader. No matter how I configure it all I get is 'Vehicle not Responding' read out. This is a early '90's computer and TB, with three prongs on the data plug. Maybe it's a '94-95 which I don't (think) have a plug for. I was really wanting to at least read all my senser voltages, but, guess I'll buy a wrecker if I have to. May be installing a bright, shiny, new 4 barrel on the side of I-35 somewhere. This thing is getting close to being dumper FOD. And it ran so good the first year after I installed it.
mel
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Old 01-10-2009, 07:14 PM   #30
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Make sure you have the right reader... there's a difference between the OBD II and (I?... it's been awhile). When I converted my early '90's Astro v6 to a v8, I had to change computers as well. I do remember there was a cheap and dirty way to read the codes (an error code will store until you disconnect the battery for a couple minutes.. so you don't need real time reading). I think if you made a jumper between the first and 3rd terminal, the check engine light would blink out the code (I jumped it with a paperclip I kept handy). HOWEVER, please read up on which terminals to jump, as it has been a while since I did this!!

Also, my local Schucks (or Parts America), Autozone, etc had readers I could borrow in their parkinglot.

Electrical gremlins are a bear... but that tbi should work much better than any old carb...
Marc
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Old 01-11-2009, 12:22 AM   #31
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Hmmm... any idea what the exact year of the computer on the TBI?

Marc is correct before the day of ODB-II (96+) their were some jumper that would flash out a code that you could map back to an error/warning state. I just have not done that for a while...
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Old 01-11-2009, 06:52 PM   #32
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I pulled the computer out and right there on its little silver case was all the configuration information, 1990 8th digit K. Cleaned and greased the date plug and BANG, 'No Trouble Code'. So, next step... Got the silver box on top of the dog house. Monday I'll get my friend to go for a ride with me and try to read the operational data.
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Old 01-11-2009, 09:13 PM   #33
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I think that the computer would not hold a set code if the battery connection or ground!

[to the computer]was cutting out.

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Old 01-12-2009, 06:16 AM   #34
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PCM diag.


FWIW

The PCM cannot diagnose itself, if everything else checks out, it may have to be replaced.
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Old 01-18-2009, 07:34 PM   #35
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A little update, was passed Waco (300 miles) before the 'Silver Bullet' cut out for the first time. Had the CPU on top of the dog house and the wife had put her purse on top of it. Really think the temp of the CPU is the cause. Put some gasohol in her and only got 5.6mpg. Guess I need to find a place to mount the CPU where it gets good air flow. Had it behind the panel between the heater and the dog house.
mel (from sunny south Texas)
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Old 01-18-2009, 10:09 PM   #36
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Just get an 80mm computer case fan for $5-7 at any PC parts store and aim it across the unit. Those fans are 12V and it would be a good test to make sure your issue was temperature related before getting 'carried away'.
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Old 01-22-2009, 01:05 AM   #37
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I had a similar condition with the chassis air conditioning. Hit a bump and it went off, hit another and it sometimes went on. It turned out to be a loose crimp of the lug to the wire where it attaches to the buss. At the same time, all the crimps were inspected and several of them redone.
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Old 01-22-2009, 09:31 AM   #38
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Is your system using an HEI distributor and if so I have seen pickup coil wires in the distributor do this type of thing.
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Old 01-25-2009, 06:53 AM   #39
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Quote:
Originally Posted by BLACK FARGO View Post
Is your system using an HEI distributor and if so I have seen pickup coil wires in the distributor do this type of thing.
I changed the pickup module in the distributor, but not the distributor. It is the same as I installed to replace a vacuum advance type when I installed the EFI.
mel
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Old 03-12-2009, 09:32 AM   #40
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problem found (maybe)

Just returned (to an ice storm) from sunny south Texas. The 'Silver Bullet' ran good all but one time. We stayed in Ft Worth Tuesday night. Woke Wednesday morning to 35 degrees, north 35mph wind and rain/sleet. Did get 10 miles up I-35W when the engine cuts out twice and all the lights of out. Smell something burning as I coast to the shoulder at 7:30 am. Did I say it was cold and raining and sleeting and wind blowing at 35+mph? I open the glove box, pull the switch and it does nothing. I pull the dog house cover and look, I look under, I look around, my flash light goes dead too. DANG! Now the coach batteries are dead too. I call AAA. I know it's a dead short in the battery cables, but I can't find it in this weather. I call and try to find a place to get towed to. You know, that's not easy. But turns out I have 4 hours to wait on a wrecker. Camping World refers me to Danny's RV in Denton, TX and at 12:00 noon they make room in there shop and push it onto the rack with a fork lift, then go to lunch. The wife and I go too. When we get back, SHE'S FIXED! Knew I was going to get robbed, but no, $74. They found the battery cable grounded against the front shock. They let the batteries charge for a couple hours and by 3:00 we are on the road again. No cut-outs. Don't know why the house batteries went dead too. Know it would be something simple, but with all the batteries dead I would have burn up the alternate without the charging them some.
Now I need to adjust the air ride, looks like picking the front up to tow moved the levelers on the tag.
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Old 03-12-2009, 04:25 PM   #41
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Mel- Sure hope this problem is finally fixed now. I have seen where a problem in one circuit can "bleed" and affect a seperate circuit, especially where computer circuits are involved.

I'm curious about towing from the front like that. Not anticipating our 345 needing a tow but I've always been told towing from front on rear wheel drive vehicle can damage automatic transmission. Are there exceptions? What was the distance yours had to be towed? Did they drop the driveshaft?
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Old 03-13-2009, 07:32 AM   #42
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the drive shift was dropped. not sure the 545 Allison trany don't have a rear pump, better to be safe than sorry.
mel
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