Hey guys I have a 2001 Ford F-150 Supercrew with a 5.4L.....lately its been really weak in acceleration!!! after you get it up to about 2500 rpms it jumps up and goes but until then its like its bogged down or something! replaced camshaft position sensor, fuel filter and fuel pump and it hasnt changed! cleaned my MAF sensor and still nothing has changed!!!! does anybody have any thoughts on what this might be and has anybody else had these problems???? any info would be greatly appreciated!!! thanks guys!

 

try cleaning your throttle body, or it may just need a tune-up

 

I'll try that!!

I bought it 40,000 miles ago and did a full tune on it when i bought it, think it needs one again this soon?

 

Definitely...do you notice a difference in power when you drive it in the day as opposed to at night?

Remember to use motorcraft products only!

 

Do you have any CELs?

 

You must be joking, there are better products at cheaper prices.

 

Javi is right about using motorcraft parts. Fords are VERY picky about using aftermarket parts, especially the electronic parts. I ALWAYS stick to OEM Motorcraft parts.

 

Enlighten me about these better products please.

 

Take the advice and use Motorcraft plugs. Other brands can and have caused problems.
Air filter O.K.? Does symptom occur without being under load? I have seen cat converters plug up at less than 100,000 on 5.4.Have you scanned for codes? Fix any hard fault codes before throwing darts at the board.

 

It seems to do better at night but not like normal!!!!
when i changed the plugs i put ngk in it like 40,000 miles ago, the truck does fine at idle and when ur just cruising down the road but as soon as you give it a little gas it just feels weak!!! from a dead start it doesnt really jump up and go till it gets to 2500 rpms!!
had a ford mechanic tell me its probably my throttle body needing cleaning since when i looked at it today it had alot of black gunk behind it, and he said if that doesnt fix it that it will probably be my coolant temp sensor!!

i do all my own work ive rebuild many engines but what is CEL's??? probably something i already know just not used to the apreviations