Hi, I'm new to this forum. I instsalled high flow air intake and magna flow muffler. At about 40-50 mph, if I punch throttle, it falls on its face and misses as it gradually picks up speed. Where do I look first. I have rechecked my installations and had them rechecked by someone else. No codes in system. Idles perfectly.
any ideas?
Joe

 

Did you Reset the ecu after these mods...?

 

No, I didn't. Tell me how?

 

Disconnect the battery.
Turn on the headlites ( this drains any residual energy storage).
Wait 30 minutes.
Reconnect the battery.
Go for a drive... ecu will relearn with local conditions - takes a while...

Note: this is something to try - not guaranteed or intended to fix a real problem or a hard fault.

You should learn to use the Search function on this site - amazing what kinds of great advice / ideas you'll find!

 

My impression is that the learn procedure is primarily for idle, but I may be wrong. Let us know if the learn procedure fixes it. If not, we can try other things. If it runs good except under heavy load and mid-high RPMs, it sounds like a fuel filter or secondary issue. Keep us posted.

 

Before driving it you might want to let it idle for 5 minutes or so to help it learn the idle. I believe my owners manual for my 2002 wants you to let it idle in for a minute or two with all accessories off and then again with the AC on. Also you might have to drive it for a while (20 miles or so) before it learns everything and runs the best.

 

O.K. I have the battery disconnected now. I put a new fuel filter on it yesterday. Old one and the fuel in it looked good. I'll keep you advised. I see alot of coil suggestions here. Is that a common problem.
Joe

 

Well coil's are commonly blamed. Mysteriously, they often only fix the problem for two days or so. Yes, coils are problematic. But not every misfire, rough idle, or poor milage is coils.