All,
I have a 1990 E-250 Mark Conversion Van with a 5.0 Liter Engine and a 4 speed automatic transmission. It has Dual Tanks.

Been trying to get this thing reliable enough so the wife can get the van on the road. The vehicle has very low mileage (77K) original mileage. (Nope, it has not flipped 100K but the vehicle sat due to person having bad health - not able to walk etc. - Personal friend) Vehicle had set for almost 7 years.

Anyways here's the deal, I have replaced everything in the fuel system up to the engine with new parts. Including fuel regulator, manual selector valve, pumps (internal and external) and even new tanks. Also all filters have been replaced twice. Originally the vehicle would not run. I have it to the point I can drive it to and from work but the issue is a performance problem.

Basically if I give much more then 3/4 pedal the engine just does not respond (it picks up likes it going to) and the RPM drops down (way down) but does not stall. It might pop a little but never stalls. No Engine light is being displayed.

I also noticed that 4th gear does not appear to engaging or if it does it slips out. Supposedly the original owner had the trans rebuilt but no receipts to back it up and he is now passed away. Not sure if related or not and I can rebuild/replace the transmission. (handle it as a separate issue)

I am wondering if the TPS is bad.... or looking for what other thing could cause this performance problem?

Thanks,
Chris

 

Good luck S-man, I've been dealing with my 1989 since I let it sit too long. Fortunately I have a ck engine light so I have somewhere to start.

Hope you work it out and post what the issue was to help us all.

 

All,

Does anybody know of the symptoms of a bad TPS sensor?

Thanks,
Chris

 

Could this be related to fuel pressure? Anything sitting that long might have developed an issue with the fuel pressure regulator.

 

All,
Already replaced the fuel regulator on the engine.

Also checked pressure ( Most recently after replacing Manual Selector Valve). Previously when the selector valve was bad, the engine would cut out do to the fuel pressure cutting out when I stomped on the pedal. (No fuel). Turned out that the selector valve was fill of gunk. I replaced all the filters and selector valve.

Please keep in mind, all the fuel system has less than a 1000 miles and is all new not yard replacements. Including tanks, manual selector valve, and pumps (3 total - 2 internal and one external)

Also it does not change performance (issue) regardless of tank selection. That's why I question it being outside the fuel delivery system or being after the outside pump somehow but I am thinking something controlling it possibly. Maybe Ignition....I am kind of stumped.

Kind of need this van up in the next month or so as I am expecting twins in August and need the bigger vehicle.

Thanks,
Chris

 

Since this seems to be mostly engine related I'd ask the same questions, offer the same symptoms in the appropriate engine forum here on FTE. Not sure which fits your needs but in the Performance, Engines & Troubleshooting--maybe this one: https://www.ford-trucks.com/forums/forum55/?

HTH

 

Put it over in the Performance Area;

https://www.ford-trucks.com/forums/1...l#post14402552

Thanks,
Chris

 

All,
I thought I would also post in this thread as well as the newer to help anyone running into a similar issue.

The issue turned out to be the TPS (Throttle position sensor). It was around 25 bucks and not the easiest to remove but the old had no spring back and I just replaced it as its location in my mind was not worth the effort to test just replace.

The engine now performs as I would expect.

Thanks everyone!
Chris