Way off topic 1993 caravan transmission

[Sniper]

24 minutes ago, Los_Control said:

Best I can figure is heat at this time

My thought as well, if you have a heat gun or even a hair dryer you can use it to heat things up in the driveway and see what fails.  I'd start with the coil pack.

 

25 minutes ago, Los_Control said:

If you stick your finger into the plenum it will come out oily and black with soot .... Is that normal?

Maybe, depends on how close the PCV connection is and how oily it gets.  Pull the PCV hose and see how oily it is to get an idea?

[Los_Control]

Hang onto your hat @Sniper wind gust up to 60-65 mph tomorrow.

 

I can try the heat gun and see what happens ... pcv looks normal.

 

Someone is suggesting bad injectors .... I might have to follow that route and see what develops.

I have always carried the original fuel rail over from original engine to the next .... they now have 190K miles on them.

 

I first want to test the two other sets I have before installing ... no problem buying new, but if I could verify first it was the issue ....

 

Either way ... off to cook dinner and wont even poke my head out the door tomorrow ... take care all

[Sniper]

1 hour ago, Los_Control said:

wind gust up to 60-65 mph tomorrow.

 

And I am headed to Sierra Blanca for a job.  Good thing I am not paying for the gasoline

[Ivan_B]

I doubt that the old oil will do much harm. The injectors are also an unlikely culprit. Thinking about temperature, however, do you have an infrared thermometer? Try taking the measurements of various parts/sensors while the engine is fully warmed-up and is still running well. And then compare the same with when it is not running well. Check what things became hotter and go from there.

 

Also, when the car is running poorly, is your battery voltage normal? I was thinking maybe the charging system ain't doing well when warm?

[kencombs]

When it is misbehaving, does spark look the same on all cylinders?  Could be a clue there if only 1/2 of them vs random vs all, etc.   1/2 because of the dual coil setup (internal to the coil) that I think it has where half of it fires half of the cylinders.   Or if it's all then that points to sensor/control circuit. 

 

Crank position sensor came to mind first, but you've replaced that I think. Non-original parts are suspect these days though.    Bad ECM ground?   I'd be tempted to run a separate ground wire, ECM, Chassis, engine just to rule out. 

 

 

[Los_Control]

3 hours ago, kencombs said:

When it is misbehaving, does spark look the same on all cylinders?

I have not checked all cylinders ... I feel swapping coils should mark the coil off the list .... then replacing the electrical wiring to coil also.

 

I have heard many times to always buy sensors from the dealer for oem parts. I have no idea if OEM is still available for a 32 year old vehicle. ... I have no dealer anywhere near me to purchase one.

When I installed the engine I replaced coil, wires, plugs, crank, cam sensors...  Replacing the brand new crank sensor was the first thing I tried .... so I have tried 2 new crank sensors and nothing changed ... while it is still possible, kinda doubtful.

 

I tried a experiment yesterday .... unplug the MAF and then take it for a drive and see if problem disappears.

It idled too fast so I never did drive it ... I let it run and warm up. I believe after it was warm the computer went into closed loop and it ran like total crap. .... I plugged the MAF back in and it ran normal again. Also CEL came on without MAF, went out when plugged back in.

 

So I now think the computer is working properly and is grounded.

 

Over on the Chrysler minivan forum I have been getting some good suggestions, most all of them has been covered from this thread already.

Seems the injectors are color coded for different engines/years.

The current engine came with orange injectors and the engine came from a car.

I installed the black injectors that came with the van ... it was easier.

So next move will be to swap injectors .... I doubt it will help. Seems I tried everything else, may as well swap them also .... they do have less miles on them then the current injectors.

 

I decided to work on the truck over the weekend. Have it back on blocks and ready to paint the last 2 wheels.

The new turn signal switch arrived so I can finish the wiring on it .... install new tires on Monday.

Change injectors on Tuesday.