94 Dodge ram 4x4, runs super rough.

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A scan tool works not just for reading codes. But u need someone that actually knows how to read the data the tool brings up. Maybe the ground wire back at the frame for the fuel punk is loosing its connection. Kim
 
mech1nxh said:
^^
Entirely possible as the distributor may have been removed and replaced by the trans shop in an effort to 'make the vehicle run' after a ? 2-3k $ rebuild.


cope,
no scan tool needed on Dodge truck OBD1 ...
key ON, OFF, ON, OFF, ON -- observe and record the dash 'flashes' from the amber
siloutte of the ck engine lamp .

With Very Humble Respects Honored Posters --
cope May I suggest a code baseline -
?Dash code cold?
?Dash code hot ?
Click to expand...

Let me try and understand this.

So i do the key on off thing with the engine cold. Record code.

Then do it again when the engin is hot and i should get a different code?

I have almost zero experience with obd1.

Thank you!

I cant work on the truck until at least monday but im excited to try and get it back on the road.
We spent 2 years building the dang truck. Pops drove it for about 3 weeks and now ots been broken for 6 months.....

He would be over the moon if i can get it fixed.

Thank you guys SO MUCH!

i
 
My old mac scan tool would work on the obd1. If you were north of the border i would send it to you to use.
In order for my newer scanner i would have to get an adapter off the snappy truck.


Should poke around the web and see if anyone is selling a DRB. That was the mopar dealer scan tool back in the day.
Have seen them come up for sale periodically.
 
Tooljunkie said:
A few things i recall from my time at the dealership back then.
If it is a returnless fuel system, the regulators on top of the pump go bad. They arent hard to change.
The ignition coils on those trucks go bad, you carry a spare like you do with a ballast resistor in the older cars.
Cam/crank sync could be out, if distributor was removed and proper timing procedure wasnt followed. Need a scan tool.

trans was out,crank sensor may be damaged, first thing i would look at. Not the first time i have seen that, dropping trans without pulling crank sensor first will most often crack it.

only thing i have left and can suggest is coolant temp sensor.

taking it to multiple shops because the last one couldnt fix it is not the best thing to do, you are paying someone to retrace the last guy’s steps.
Click to expand...
This is what I think also. Kim
 
My old 99 would die after getting warmed up, then I'd go underneath and whack the the tank and Bam! Start right up! Fuel pump was trash.
When the o2 sensors would fail it sounded like it had a big cam at idle.
 
Fuel pressure tester, monitoring fuel pressure is easy. I drove a car for a week,pressure gauge under windshield wiper. turns out our insurance company installed an anti theft device and part that kills fuel would fail when the stars aligned.

Guy swapped a transmission in a newer ram,cut a wiring harness retainer behind the plenum,and hacked through a few wires. Followed with swapping in a bad valve body to compound the problem. Took me 2 days to figure that one out.
I was the 4th shop to take a kick at it, the others gave up.
 
Cope said:
Let me try and understand this.

So i do the key on off thing with the engine cold. Record code.

Then do it again when the engine is hot and i should get a different code?

I have almost zero experience with obd1.

Thank you!

I cant work on the truck until at least monday but im excited to try and get it back on the road.
We spent 2 years building the dang truck. Pops drove it for about 3 weeks and now ots been broken for 6 months.....

He would be over the moon if i can get it fixed.

Thank you guys SO MUCH!
Click to expand...

Record code (s) cold if any & post.
Record code (s) at hot failure point & post.
 
I've had this issue as well.
Input and output speed sensors as well as re-indexing the dizzy.
Someone posted the instructions to do this.
Buy Mopar sensors, the Bosch and BWD ones are horrible.
The crank sensor needs to be properly spaced as well. The Mopar sensor will have the proper shim on the end of it. Makes it easy.
The PCM could be shot as well. I've used FlagshipOne with a lot of success with PCM's, ECM's.
 
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