ck eng lite on, no cats, lag on cold acceleration - Ford Mustang Forum
 
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post #1 of 6 (permalink) Old 12-28-2005 Thread Starter
 
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Exclamation ck eng lite on, no cats, lag on cold acceleration

Hi all,

I just purchased a 1995 mustang with a replacement 3.8 in it with 150,000 miles on it. The previous owner installed dual flowmasters from the manifolds back and no cats. I have a Check engine light on that I would attribute to the lack of o2 sensors but I also have a lag in acceleration when cold and when warm it occasionally will sputter like its not getting fuel. o2's, TPS??? HELP!

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post #2 of 6 (permalink) Old 12-28-2005
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Quote:
Originally Posted by bigdaddyrick
Hi all,

I just purchased a 1995 mustang with a replacement 3.8 in it with 150,000 miles on it. The previous owner installed dual flowmasters from the manifolds back and no cats. I have a Check engine light on that I would attribute to the lack of o2 sensors but I also have a lag in acceleration when cold and when warm it occasionally will sputter like its not getting fuel. o2's, TPS??? HELP!

bigdaddyrick
sputtering is usually either a fuel filter, fuel injectors, or you need to clean your MAF. Just spray it with computer comtact cleaner. Don't touch the wires.


Woe to him who builds his palace by unrighteousness,his upper rooms by injustice,making his countrymen work for nothing...Does it make you a king to have more and more cedar?Did not your father have food and drink?He did what was right and just,so all went well with him. He defended the cause of the poor and needy,and so all went well...But your eyes and your heart are set only on dishonest gain,on shedding innocent blood and on oppression and extortion. Jer 22:13, 15-17
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post #3 of 6 (permalink) Old 12-28-2005
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could also be the IAC acting up & keeping the "choke" on . . . Idle Air Control valve.

Woe to him who builds his palace by unrighteousness,his upper rooms by injustice,making his countrymen work for nothing...Does it make you a king to have more and more cedar?Did not your father have food and drink?He did what was right and just,so all went well with him. He defended the cause of the poor and needy,and so all went well...But your eyes and your heart are set only on dishonest gain,on shedding innocent blood and on oppression and extortion. Jer 22:13, 15-17
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post #4 of 6 (permalink) Old 12-30-2005
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Maybe a broken MAF all together. that will bring up a lot of lag on the accel. It's either dirty or broken, get it checked

-Mustang dewd
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post #5 of 6 (permalink) Old 01-03-2006
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Quote:
Originally Posted by kscoyote
could also be the IAC acting up & keeping the "choke" on . . . Idle Air Control valve.
Sorry for budding in this thread...but when I saw this - that's the exact problem my stang is having (im pretty sure at least).

When the car is warm and I come to a stop, the engine will sometimes dip down to below 500rpm, and sometimes even stall on me. It seems to happen more when I take the car out of gear without using the clutch. (Is taking it out of gear w/out the clutch bad for it?) But it will happen even if I use the clutch sometimes, too.
If it is the IAC, how would I diagnose and/or fix it?

On a side note, it's a '02 3.8L w/17k on it and K&N FIPK2. Rest is stock.
Thanks!! :thumbsup

2002 Sonic Blue v6 5-speed
Mods: K&N FIPK2 CAI, Motoblue 42% UDP, Steeda Tri-Ax, next up - time for a new clutch I think and a lightweight flywheel if I can find a relatively inexpensive one...
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post #6 of 6 (permalink) Old 01-03-2006
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Quote:
Originally Posted by load
Sorry for budding in this thread...but when I saw this - that's the exact problem my stang is having (im pretty sure at least).

When the car is warm and I come to a stop, the engine will sometimes dip down to below 500rpm, and sometimes even stall on me. It seems to happen more when I take the car out of gear without using the clutch. (Is taking it out of gear w/out the clutch bad for it?) But it will happen even if I use the clutch sometimes, too.
If it is the IAC, how would I diagnose and/or fix it?

On a side note, it's a '02 3.8L w/17k on it and K&N FIPK2. Rest is stock.
Thanks!! :thumbsup
It's still under warranty -take it to the dealership.

Woe to him who builds his palace by unrighteousness,his upper rooms by injustice,making his countrymen work for nothing...Does it make you a king to have more and more cedar?Did not your father have food and drink?He did what was right and just,so all went well with him. He defended the cause of the poor and needy,and so all went well...But your eyes and your heart are set only on dishonest gain,on shedding innocent blood and on oppression and extortion. Jer 22:13, 15-17
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