hey every one im new to this site... i was just wondering if someone out there could help me out with my problem.... my 1997 7.3L will sorta cut out or buckle and surge really baddly when i press the gass... really badly when im going up hills or under load...the truck does this when its about to hit the 2,000 rpm range...ive replaced my injectors with stage 1's, cps, 17* hpop, new ipr, icp sensor, and not that long ago replaced my IDM...just tonight i replaced my HPOP thinking it was the problem and things just seemed to have gotten worse... when i removed the fuel bowl and checked inside it seemed to be a lil dirty.. so when i put everything back together it runs really bad and will now staLL and have hard time starting...could a fuel pump cause problems like this?? or does anybody have any advice for me thanks alott!!

 

CPS (Cam Position Sensor) can cause these symptoms. It's the only thing you didn't replace.

It can take up to 20 miles of driving to purge all the air out of the fuel and HPOP system.

Are you getting a Check engine light? Get it scanned for codes anyway.

 

hey thanks cude jim for the info... and ive also changed the cps... soo ill try out yur advice with the bleeding... if my truck can start

 

opp's missed that you did replace the CPS, sorry I can read faster than my brain can comprehend. Be sure to check the wires and socket going to the CPS also.

Get it scanned for codes even if the CEL is not illuminated.

 

hey thanks again cuda jim... ive checked my wiring and cps... i was driving it today and some times it will run fine when i gass it and some times it wont.... and some times when i open it up it will be going fine accelerating then all of a sudden the engine will just cut out like as if some one turned the key off.. when i let go the gass the engine will run fine again??? well anyways thanks alot for the help... also could this be a fuel problem??? thanks again

 

It kinda sounds like electrical but I wouldn't rule out fuel too. Does the entire truck shut down, ie radio, lights ect.

Have you checked your fuel pressure (FP)? If you think it's FP, rig up a gage place it so you can keep an eye on it the next time it the engine cuts out. (ie. Tuck it under the wiper).

A faulty IDM (Injector driver module) could be cutting out but I'm pretty sure it would throw a code. I know you replaced it a while ago, was it new or used?

It could be the TPS (Throttle Position sensor) but that should throw a code too.

Beg, borrow or steal a scanner. They are invaluable for diagnosing intermitant problems. If you can leave one hooked up while your driving it may show the area to look into.

 

How long ago did you replace the cps? They've been known to go bad pretty quickly.

 

yeah it definitely sounds like a CPS

 

I wouldnt rule out the TPS mine would cut out and stall stuned out to be the TPS.
-----------Jeremy

 

hey guys thanks alot for the info... well ive changed the cps recently and took it for a drive and the same thing happens...and the throttle position sensor i havent looked into yet?? is it on the pedal assembly?... and i have one of thoes obd|| code readers.. and it shows no code.. and when the truck cuts out everything stays on... just that the truck will no longer accelerate untill i let off the gass and its below 2,000 rpm...weLL anways thanks again guys!!!

 

The TPS is on the go-pedal. It is replaced as an assembly. You might be able to clean it b4 replacing. Use WD-40.

Here's some part #'s:

Throttle Assembly (Includes Pedal, TPS, & IVS) 94-97
(Ford) F5TZ-9F836-A (f-Series) 94-95
(Ford) F6TZ-9F836-AA (F-Series) 96-97
(Ford) F5UZ-9F836-B (Econoline)

TPS (Throttle Position Sensor) 94-97
(Ford) F2TZ-9B989-C
(recently available, haven't confirmed it works yet)

 

hey thanks alot cuda jim... youve been very helpful!!!

 

You can check the TPS voltage too prior to replacing it. It should max out around 4.7v.

 

is that a ford # that you can get from a stealership?

 

It's a ford part#. I don't know if it's even available. I got it here:
http://www.thedwilsons.com/powerstro...t_Numbers.html

I've heard it may be available but I haven't tried myself.