one final plea before I junk it...

[cbr900racer]

This thing is driving me up the wall...(86 Ranger). What would make it run so rich it will wet foul new plugs in just a few minutes? New parts...FPR, TPS, coolant temp. sensor, idle bypass whachamacallit, map sensor. It has sat for5 years. I dropped tank, everything looks fine, has fresh fuel. Runs like crap for a few minutes then starts dropping cylinders and blowing black smoke like a turbo diesel on steroids. Is showing a code 63. PLEASE help me!

 

[Dangeranger3]

The tech library has the code meanings. Its says 63 is tps signal too low. HTH

EDIT: This thread might be helpful. http://www.therangerstation.com/forums/showthread.php?t=30429&highlight=voltage It tell you what the proper TPS voltage is. What is yours currently?

 

[cbr900racer]

I set it to .998 volts with throttle closed and it progressively goes up to 4.8 volts at WOT which should be in range according to what I have read. Now it's showing a 31 code

 

[Dangeranger3]

The codes are in the tech library. I think you have a bad ground. but check out your egr.

 

[Will]

Injectors are all leaking like crazy?

 

[cbr900racer]

Injectors are all leaking like crazy?

that was one of my first thoughts...but dang, all six!! what are the chances?

 

[CraigK]

You don't mention this . . .
Do 86's have an O2 sensor?
If so, try disconnecting it.

My '87 ran like shxt for years (including 5MPG, black smoke etc.). I replaced so many things I'm too embarrased to list them. When I unplugged the O2 sensor, instant fix.

CraigK

 

[Z3CHYD]

You don't mention this . . .
Do 86's have an O2 sensor?
If so, try disconnecting it.

My '87 ran like shxt for years (including 5MPG, black smoke etc.). I replaced so many things I'm too embarrased to list them. When I unplugged the O2 sensor, instant fix.

CraigK

yes, 86's have a single o2 sensor on the exhaust. AND......this was the same exact problem my 86 had, and all it was was a bad o2 sensor on the exhaust, so to the original poster, check the o2 sensor on your exhaust, because that was the problem with mine.
(When you think about it, a bad o2 sensor would make all that happen, since it reads the exhaust, and tells the engine to run leaner or richer, without it, it will run reaalllly rich and dump black smoke out the tailpipe, which is what mine did also.) so check that o2 sensor!!!!

 

[cbr900racer]

If that is what it is...drinks are on me! It never occurred to me to unplug the sensor (Lord knows I've unplugged everything else)...Which reminds me, I DID unplug alot of stuff and made no difference in how it ran (map sensor, temp sensor, air temp sensor) which was really odd. Anyways, I'm gonna unplug it first and if it makes ANY difference at all, I'm replacing it.

 

[UnderMedikated]

Converter could also be clogged.

 

[cbr900racer]

Converter could also be clogged.

That problem was eliminated by previous owner

 

[Z3CHYD]

Just remember that if you unplug the o2 sensor, that it will make the engine run in an open loop, so it will use more gas i.e. terrible mileage

 

[cbr900racer]

I don't plan on running it without the sensor hooked up. I just want to see if that is my problem. All the other sensors have no effect on running when unplugged. I have thrown so many new parts at this thing, I really hate to buy it anything else. I've know previous owner for about 10 years and he drove this thing everywhere so I know deep down there's a good running truck in there somewhere

 

[JohnPi]

I'm not familiar with the '86 computer, but is there a chance that unplugging the sensor just put you in "limp mode" and that the sensor you unplugged is not really the problem?

Can someone chime in that has more familiarity with the '86 system?

 

[86jalopy]

mine ran ass rich until i fixed the broken signal wire to the ecm from the o2 sensor.i would check to see if the signals from the sensors are making it to the ecm.the wrong ecm will also wreak havoc on drivability.an 86 wiring diagram is about half way down.
http://www.my5oh.com/forum/viewtopic.php?f=31&t=4275&start=0