I posted a couple of weeks ago regarding rough idle and stalling, turns out the elbow on the line from the EGR valve was cracked and had come out of the throttle intake. Once replaced the problem disappeared. Now I notice the truck seems to have no power. My mechanic believes the truck is running lean and the problem may be with the cam position sensor or the MAF. Any suggestions.


Thanks,

Chris

 

My mechanic is now stumped. He tried a new MAF and CAM sensor but that did not fix the problem. Injectors have been cleaned, plugs and wires replaced. There are no codes and the motor is still powerless. Fuel pump pressure is around 30psi. Suggestions??????


Chris
1997 F150
4.2V6, 5 spd manual
Reg Cab, Flair Side

 

I'm not sure what you are saying. Your truck lost power after replacing the EGR valve? If you aren't getting any codes, then you more than likely aren't running lean.

 

My mistake, I believe the plastic elbow and the hose to the PCV valve were replaced fixing the stalling and rough idle. The lack of power problem was discovered after fixing the first problem.

 

Lack of power is a relative term. Do you mean that it won't roll out of the yard, or just down from where you want it to be? If the latter is the case, then my truck is the same way!! Seriously though I would check the timing, retarded timing will make it seem like a dog down low, but run better at highway speeds.He may have affected the timing when messing with the cam position sensor. That would almost have to be the case if all else is well. The timing has to bge checked a certain way, I don't have my manual in front of me, but it's not just hooking up to the #1 wire and firing a light at the crank pulley. Just make sure it's being checked correctly, and I bet you will find it off a little.


P.S. your idle speed will be down a little also

 

Thanks, your description is exactly how the truck is acting, dog down low and almost normal at higher rpms. I passed the timing info along to the mechanic and he will check it this afternoon.

I hope this is it. I'm getting tired of driving the minivan.

 

No prob, just let us know how it comes out.

 

revster,
I think travlnman might be on to something. By all means, please let us know what you find. Your's is an interesting problem.
Thanks much!

 

Ok, the saga continues. The timing was off and has now been corrected but the motor is still powerless. The truck now has new plugs, wires, MAF, cam sensor and the throttle body has been cleaned. The catelatic converters are one year old and appear to be fine. The only code that comes up is a transmission code which is weird as it is a manual. Could this be a chip or computer problem? If so how can I get these checked?

Thanks for any suggestions.

Geting frustrated, (as is my mechanic),

 

I've solicited some help. Maybe we can all get it figured out!

 

Does it have less power than it used to have? Did it get worse after the work was done or was it like that before?
On these you will get a transmission code if the clutch pedal isnt pressed during the test.
When he scanned it did he do an Engine Running scan too?
How did he set the CAM sensor? You need to use a special tool to do it properly.
Has he checked for vacuum leaks?

 

I know this is a late question, but have you unhooked the battery for awhile to reset the computer?
Also, pull a couple of spark plugs and see how they look.
Jimmy

 

Thanks for trying to help.

The truck definately has less power than it used to. At this point spinning the tires would be impossible and just taking off seems to be a chore.
The problem existed before, (may have built up over time), but I attributed it to needing a tune up. I initially took it in because it wouldn't run without my foot halfway to the floor because of the EGR hose and elbow, (now fixed).
The Scans have been done with the key on and the engine both on and off, (he never heard of having to depress the clutch).
The cam sensor and timing were set using a special tool for Fords, (he purchased the complete Ford kit for around $400).
He has checked for vacuum leaks, cleaned the injectors and performed a spark check.
The Fuel pump is within specs -- but on the low side
Compression is good.
5 of the plugs were wet, #1 was dry when he pulled them.


Thanks again for any suggestions,

Chris

 

What were they wet with? Gas, oil or anti-freeze?

 

Gas