STILL NO POWER?

[howiefisher]

i put in a new mass air flow sensor helped bottem end but top end 4000rpm up its bogging like it has a rev limiter put in 2 new 02 sensors today no check engine light any more but still no top end power .will a vacuume leak starve only top end power or should i be looking towards fuel problems

 

[RIO5.0]

Have you verified F/P and vac by gages??

 

[go-stang5.0]

could be fuel filter.....but yea verify fuel pressure and go from there.

 

[go-stang5.0]

oh you may want to try resseting the cpu

 

[howiefisher]

is that the fuel pump reset switch in the trunk .?has any body ever had these problems is werd like a rev limiter they don't have one right

 

[RIO5.0]

Thats an inertia switch in the trunk...Its an on/off deal.

Do you have access to a vac gage...thats an easy one to see if the system has leaks...the wont hold the gage steady, but be jumpy...same with the FP you need to see whats its doing or has pressure wise....
You can go to any parts store and get both gages from Accutron for maybe 70-80...then you have em for testing....always good to have...or pay someone to check those out....guessing sucks and can be $$$$$

 

[HISSIN50]

Good stuff above. I find it interesting that you just had two lean codes didnt you, and you sound to be possibly running lean at the top end................. As Andy and GS suggested, REALLY look at fuel pressure, esp at WOT (when it bogs) if you can. Of course, have an assistant watch FP so you can watch the roadway.


Howie, you work in a dealership IIRC. I take it that it's not a Ford one, huh? If one of your techs is nice and has an an OBD-I code 'reader' (not scanner. I'm talking about something like an Autoxray 5000), have him view PIDs (he will know what you're talking about) during a test drive. This won't show Fuel pressure but will show many EEC sensory values.

Good luck.

 

[howiefisher]

i work for dodge i tried the scaners there they wont work so. i have a vacuume guage and it works for fuel pressure to i think how to teat fuel pressure at wot with out the scaner not on the host right ?like i said its like it has a rev limiter at high rpm i dont think its plugged exuast ?

 

[94gsl5.0]

Oops... thought your car was blown.... my bad. Disregard post.