Alright today i was testing my new hood scoop to see if it would hold on at highway speeds and i noticed something odd. My CEL, ABS, and TRAC OFF are normally on, and when i turned on the car my CEL started to blink for a few seconds and my tach was jumping a tad erratically. When i was making a turn to get onto the highway my trans got stuck for a few seconds between 2nd and 3rd and my tach jumped to about 5. Once i was on the highway i noticed that it was shifting very slowly, even when i was flooring it. The past few days my car has been shifting pretty hard, i figured it was bc i was driving a little recklessly. Now with this problem I'm a bit worried for my monte, what could be causing this?

If u need anymore info let me know

 

could potentially be the cat being clogged

 

is that something i can fix or atleast check wihtout paying $$$?

 

Get the codes read at autozone, if its safe to drive the car. A cat usually shows P0420 code.

 

You have a misfire somewhere...could be a bad ignition coil.

What year and engine is your car?

 

Your car is misfiring like crazy (flashing CEL) and it's throwing the car into a "safety zone" where it's pulling timing like mad.

Stop driving whenever you see a flashing cel and get that misfire fixed. Check all the plugs, wires, everything

 

2003 3800 n/a


just got back from autozone got PO420 and PO480.....

bc of the laws here i need a new CAT but its gonna be cheaper to just hook up an emulator... ****

 

ZZP Downpipe with Cat... still legal

 

https://www.zzperformance.com/grand_...=551&catid=110

2.5" bolt + CAT?

P0480 Cooling Fan I Control Circuit Malfunction and wtf does this mean?

 

This is just a guess, but perhaps it means one of the sensors on one of the fans is bad?