My 87 Ranger is running rich. I'm getting 12 mpg, and it barely runs. When you first start her up, she will stall 3 or 4 time, unless you keep your foot in the gas. Then when you’re driving, it likes to stall at traffic lights here and there. And she has no power going up hills. I checked the fuel placement sensor, the fuel pressure regulator, the O2 sensor, and the temp sending unit. They’re all OK.

so what could it be????

 

Timing belt jump a tooth?
Fuel injector stuck open.

 

check your Pcv hose. Mine was doing that and sure enough the hose sliped right off

 

how do i check the Fuel injectors?




I'll check that later today.

 

i checked the Timing belt and it looks good and its still tight, checked the Pcv hose and it's hooked up and it has no cuts.

how can i check if the Timing belt jump a tooth with out tearing a part the front of the motor?

 

How could you check the tension without pulling the cover off?
Answer:You can't.

How long since it was changed? Being twenty years old it should have been changed a couple times already. Also by now the tensioner is probably shot.

 

i got a new motor in 2003. it has 60,000 miles on the motor now.
the timing belt has never bin changed

 

Next you should check the Throttle position sensor.
Was this a crate engine or a rebuild ?

 

it was a JASPER crate engines
i repast the Throttle position sensor and the o2 sensor 7 mouths ago.

 

Okay I can't help myself here.

i repast the Throttle position sensor

Did you use paste ? epoxy works better

7 mouths ago.

Prolific son-of-a-gun aren't we ?

Well anyway
Is this thing throttle body injected ?
Crank position sensor ?

 

no its not throttle body injected.
i think it called multiport injection.

i got to check the Crank position sensor

 

i just call my friend up and he said it's not the crank position sensor. his dad said to check the MAP sensor. Could that be it?

 

DOH ! I forgot the older systems had those #$%&@ things.
Usually when those went bad the engine wouldn't even start.

I'm still leaning toward a bad injector as you said you need to open the throttle when starting.

 

well I'll check that out soon and I'll let you know how it went.

 

i was having the same problem with my 87 and i changed the ecu, map sensor, throttle postion sensor, o2 sensor, and a couple other sensor cant think of the names right now and it was still acting up

 

grate if i cant figure this out i going to switch it over to Carburetion

 

Could be something really simple like spark: fouled plugs, bad or slightly disconnected plug wires, bad cap/rotor... I'd start there. Make sure every cyl is getting a good spark and good clean plugs are attached.

Or air: make sure the air filter or air intake hose isn't clogged/blocked. Take the air filter out and then try to run it.

Other things: make sure a vacuum hose hasn't come off; check/reset your timing. Did they change/clean your injectors when they replaced the engine? Could try running some nasty injector cleaner through it. Theres some stuff called seafoam that people rave about, but I've never tried it.

 

thats the first thing that i checked

 

My 94 2.3l acted like that and it was the coolant temperature sensor.

 

Get a Noid Light at the local auto parts store for a few bucks and check to see that each injector is firing repetitively. This is a device that plugs into the injector harness (in place of the injector) and has a simple test light on it.

Whaaaaaaat??? What could the coolant temperature sensor have to do with moderating fuel delivery?

 

thank you I'll try that this weekend

you car need more fuel when its could. so if the coolant temperature sensor is not working right, say its reading that its could but its not it will run rich. but i replaced that, so i know thats not it.