When was the last time you changed your fuel filter? Clogged filter + Cold weather = rough.

 

Hahaha I never thought about that! It's never been changed by me. I bought it with 16,000 miles on it 2 years ago and I'm am 99.9% sure the previous owner never did. Its only had oil changes and tire rotations. Is the filter located in the fuel tank? I'm fairly mechanically inclined but should I take it in to be checked out? I don't want to mess anything up.

 

It's a really simple procedure, actually! Here's the How To: http://www.355nation.net/forum/how-performance-maintenance/16756-how-replace-fuel-filter.html

Post back your results, and then clean your throttle body after that, if it doesn't solve anything for you. Here's the How To for that : http://www.355nation.net/forum/how-...how-performance-maintenance/109-how-change-spark-plugs-clean-throttle-body.html

 

When was the last time you cleaned the throttle body?

 

Never have cleaned the throttle body either. That was my next thing to tackle after cleaning the air filter and MAF. I was gonna see how it runs with the clean MAF first.

 

Doesn't hurt to test your battery charge as well...low voltage can cause poor starting conditions.

 

Don't worry too much if you can't find the fuel filter. It is inside the fuel tank.

 

Yea, I thought the fuel filter on the later 355s was not meant to need service, since it's located in the tank?

Personally, I'd say get that throttle body cleaned first before jacking with the fuel filter IMHO. I finally cleaned mine along with changing my air filter after 6 months or so during my oil change this weekend (and a bottle of Lucas fuel system treatment) and geeez, did it need it. SOOOO much smoother running now, the occasional cold "rattle" starts have disappeared too, haven't had one since!

Regardless, good luck and let us know how it went.

Yea this was my mistake, sorry OP I have an 05 and I forget sometimes you newer guys have intank.:ugh:

 

Yea, I thought the fuel filter on the later 355s was not meant to need service, since it's located in the tank?

Personally, I'd say get that throttle body cleaned first before jacking with the fuel filter IMHO. I finally cleaned mine along with changing my air filter after 6 months or so during my oil change this weekend (and a bottle of Lucas fuel system treatment) and geeez, did it need it. SOOOO much smoother running now, the occasional cold "rattle" starts have disappeared too, haven't had one since!

Regardless, good luck and let us know how it went.

 

Haha its all good man! I forgot I had read that our filters are in our tanks also. Quick update: I just checked my voltage on my battery (with my $10 multimeter from harbor freight :eek5 So the reading may be off a tad. (One day I will buy a fluke!) Anyways, my colorado has been sitting for about 5 hours. According to my multimeter, while sitting my battery voltage is 12.5v holding steady, and when I started it, it bumped up to 14.8v and pretty much held steady between 14.7 and 14.8v So my battery and alternator seem ok. As of now, i'm assuming it has to either be my TB and/or wires and plugs. I know it only has 33,000 miles but it is a 8 year old truck and sat for about 1 year in a garage!

 

Sitting for that long usually means carbon buildup. Have you seafoam-ed it since you got it either? http://www.355nation.net/forum/how-...rum/how-performance-maintenance/49930-how-sea-foam-upper-end-i4-i5-engines.html We have ALL THE HOW TO'S!

 

Sounds like the truck just needs a little maintenance for cleaning up the sensors and throttle body to be honest. Clean throttle body makes a world of difference for sure on the truck!

Also you want to check the voltage drop on the battery as well as the nominal voltage(resting). If you see the battery voltage dip below 9V you might want to start planning on changing the battery soon. If the battery has a lower cranking amp capacity from sitting the voltage will drop harder ergo a harder start

Let us know how it works out! :salute: