2004 lb7 loss of power

[dins1]

my lb7 has ben getting slugish off of stop signs and over the last few times i have driven it towing and with out a load. it has a new fuel filter and a clean air filter. it is even more noticeable when it is not at operating temp. sees like a 2000 rpm it will just sit there and not do any thing for a short time and the it stars to pick up rpm slowly.

[Duramaster]

First step is to disconnect the EDGE and see if the problem goes away. Second step is to verify the fuel and air filter. Third step would be to ramp up the fuel rail pressure and see if it can even make at least 145 Mpa. It should make 160 Mpa no problem! If unable to make 160 Mpa, probably has a bad set of fuel injectors. :)

[dins1]

I have disconnected the edge and it still does the same. the air filter is new AFE no oil filter only 800miles on it. Fuel filter is only 800 miles on it. do i need to change it again? how do you change the fuel pressure? And what and where do i hook a pressure gauge up at?

[killerbee]

are you saying it does this when it is not warmed up?

any codes?

can you put the old intake back on?

[dins1]

all the bd intake is just the box no tubes. the bd with a K&N has been on the truck since new. I just changed the K&N out for a AEM dry flow filter. The sluggish feeling is even more noticeable when the truck is not up to aoperating temp but still there when it is warmed up

[killerbee]

I believe this is your problem.

The ECM withholds fuel until sufficient airflow is sensed (MAF sensor). IOW, the fuel dosage must be matched by a charted air flow, or added fuel will not be scheduled. The oiled elements noriously "deaden" the hot wire type MAF sensors as oil and dirt accumulate on the wire over time. So the MAF sensor is relaying less MAF than before, causing sluggish throttle response.

clean your MAF sensor with alcohol and compressed air.

Also, check for codes. Probably none, but always check. If the attitude shows MAF, you can do a before/after comp.

[dins1]

I cleaned the MAF sensor. still runs the same changed the from the new dry flow filter to the old K&N filter still acts the same. acts slugish with the edge juice connected and disconnted.

What next.

[killerbee]

Is this with the stock intake box now?
What codes did you have?

[dins1]

I do not have a stock box. it has factory tubes to a open round filter. had a K&n filter until 800 miles ago when i changed to a AEM dry flow oilless filter. As stated before the box has been on the tuck for most of its life. the truck run the same with the K&N or the AEM dry flow filter. has the same slugish felling with the edge juice and with out. here is a link to the bd air box pictures.

http://www.bd-power.com/gmc/gmcxtream.html

[killerbee]

What codes did you have?


:) ..........

[dins1]

i dont have a ses light on. i do not have a scanner to see if there are any iother codes.

[killerbee]

autozone will scan for free. There are many codes that don't trigger SES.

[Jm1205]

Same issue with lb7 here. Have been throwing parts at it but no change. Did you ever find the issue. I found found a couple similar post but nobody seems to put the final result and fix. Any help would be appreciated.

[Kennedy]

Same issue with lb7 here. Have been throwing parts at it but no change. Did you ever find the issue. I found found a couple similar post but nobody seems to put the final result and fix. Any help would be appreciated.

Air and fuel are the keys. What if any work has been done recently prior to the start of the issue? Particularly have the injector lines been loosened/removed?