Hard running and stalling???

[rich060685]

I had my '98 Ranger running perfect after putting alot of time and repairs into it. Recently it had some issues where it was stalling out going downhill. I replaced the fuel pump and filter and put some fuel treatment in the tank. The stalling seemed to stop and it ran excellent for months.

In the past few days it has started to stall out or even run hard on start and stall out. I cleaned all of the MAF Sensors and still the same problem. When it gets a shot of ether in the air box it will run good for a small amount of time and then go back to bogging down and stalling. When running hard if you hit the accelerator it will try to stall and when let off the accelerator it will raise the rps as if it were trying to run well then bog down and stall.

I'm not sure if there is a fuel regulator or such that could be going bad or not. I need the truck back on the road by Monday and am clueless to any other options that could be causing this issue. Hope someone has some insight that could guide me in the right direction.

Thanks in advance for all help.

 

[RonD]

Reads like the newer fuel pump is going out, not uncommon for 3rd party fuel pumps, good news is that they usually come with 1 year warranty, bad news is the labor it takes to swap it.

I would get/rent a fuel pressure gauge, to either confirm or eliminate the fuel pump as the source of the problem.

'98 was the first year Ranger got the Returnless fuel system, so no Fuel Pressure Regulator like '97 and earlier Rangers.
Fuel pressure on these systems should be 65psi
Test pressure with engine off
Then turn key on and watch pressure increase, priming pressure
Start engine, idle pressure
Rev engine to 2,000 RPMs and hold it there for 1 minute, pressure
Turn off engine and leave gauge connect for 10 minutes

Write it all down
At no time should pressure be below 50psi

 

[rich060685]

Reads like the newer fuel pump is going out, not uncommon for 3rd party fuel pumps, good news is that they usually come with 1 year warranty, bad news is the labor it takes to swap it.

I would get/rent a fuel pressure gauge, to either confirm or eliminate the fuel pump as the source of the problem.

'98 was the first year Ranger got the Returnless fuel system, so no Fuel Pressure Regulator like '97 and earlier Rangers.
Fuel pressure on these systems should be 65psi
Test pressure with engine off
Then turn key on and watch pressure increase, priming pressure
Start engine, idle pressure
Rev engine to 2,000 RPMs and hold it there for 1 minute, pressure
Turn off engine and leave gauge connect for 10 minutes

Write it all down
At no time should pressure be below 50psi

Thank you. I will look into this. This is killin me not having the truck on the road lol. The weather has been so bad i don't even wanna attempt to do anything :/

 

[Big Jim M]

I'd start with a new TPS. That fast running at start up is telling us something.
Big JIm