rough acceleration below 2.5k rpms

[fr0IVIan]

this started when i pulled my f2 out over the weekend and i went down to 87 from 93

it happens whether im revving from idle when im stopped, or if im accelerating from a stop. the engine just kinda bogs and sputters til i hit about 2.5-3k rpm, then it proceeds normally.

i thought it was the IAC (?) filter thing next to the EGR so i cleaned that and it didnt happen again last night, but it started up again today

i dont hear any pinging, it just sputters occasionally in that rpm range

suggestions? and if someone says its a vacuum leak, how and where do i test that?

[fr0IVIan]

ttt

[Tygerwoody]

a bad coil pack does that... but that wouldnt have anything to deal with you pulling your F2.... but its something to keep in mind

[fr0IVIan]

should i go back into the ecu and check to see all the fittings are in tight? i didnt disconnect any of the harnesses... i just unscrewed the bracket holding them and the ground wire, and i squeezed the ecu past it so i could yank the chip. then i tightened it all back up again...

[C.Kell]

hi,
first of all, sorry for my english mistakes, i speak french :-)

ok, I have the same problem that you had with your car...

did you find the problem ?? help me please ;-) thanx

Ian Langevin

[fr0IVIan]

well i changed my plugs from autolite 765 (equivalent to motorcraft awsf-42C) to one heat range colder, autolite 764 (equivalent to motorcraft awsf-32C) and the car was running GREAT for a couple days, the hesitation was almost completely gone.

then a couple days later it was raining pretty hard and i ran through a puddle that was kinda deep, and the hesitation came back... but it's been a couple days since then and it's mostly cleared up.

i think the plug change was just a quick fix and didn't really address the problem. i'm gonna replace my fuel filter next and see what that does. if it's not that, then i'm gonna look for an exhaust leak.

and your english is a lot better than my french :)

[006]

Another thing you should do:

Pics:
http://www.wildhorsesclub.com/mboard/showthread.php?t=3536&highlight=clean

Instructions:
http://v6power.net/forum/viewtopic.php?t=20821

[C.Kell]

ok before, my car with the new chip wont idle and die...

but I cleaned the Maf ( but not with electric cleaner ) and the car start good....

do you think that the problem that i said in my last message can be occured by the MAF ???

if I clean it with electric cleaner, it will do a bigger difference ??

thanx for your help

[fr0IVIan]

ok before, my car with the new chip wont idle and die...

but I cleaned the Maf ( but not with electric cleaner ) and the car start good....

do you think that the problem that i said in my last message can be occured by the MAF ???

if I clean it with electric cleaner, it will do a bigger difference ??

thanx for your help

cleaning the maf might obscure the problem slightly, your problem might be related to the contacts on the chip and the ecu not being cleaned enough.

[C.Kell]

the contact of the chip are good ( copper )...

I will check the fuel pressure today...

[pete]

this started when i pulled my f2 out over the weekend and i went down to 87 from 93



What are your mods?

[C.Kell]

ok I found the trouble this morning....

it's a little badluck...the contact of the MAF was disconnect by itself so I reconnect the sensor and everything is fine.

My mods : mustang 95 V6
Eaton M90 Supercharger with custom intercooler
255 lph fuel pump
30# injectors
stock mustang MAF
SCT Chip

[evil03mustang]

Heh, looking at that wildhorse post was kinda nostalgic of when I totally removed the lil screen thingamabob... I wonder what its purpose was, anyways?

[fr0IVIan]

this started when i pulled my f2 out over the weekend and i went down to 87 from 93



What are your mods?

just basic stuff

asp udp, dmm cai, steeda y-pipe duals

i switched to 32c plugs about a week ago, and i think if the fuel filter has been replaced at all it was replaced at 50k miles (i'm now almost at 99k), but i get the feeling i've never had it replaced.