Mechanics HELP - 2003 Blazer problem!?

Question

I've had so much work done I am at the end of my ROPE!

No check engine lights are on. At all. Starts fine [its northern Canada -38 today!]. It is running rougher then usual, seems to hesitate when changing speed [slower -> faster etc]. Also if I stand outside and listen to it, it sounds a little like a jet engine [about twice a minute for a few seconds] and has a weird on-and-off again chirping sound like it is full of dead mice :P

The only thing I have done different since getting it fixed is add some gasline antifreeze [yes it was the proper type] to a full tank of gas because with the windchill it is -50 C . Any ideas? - can I have a major problem without a check engine light coming on?

Thanks for the help!

The work I had done about a month ago was:
1 - tune up
2 - change fuel filter
3 - general inspection
4 - change plugs to the right type [hahah]
5 - replace fuel injectors and fuel pressure regulator

My serpentine belt was replaced in August 06 to get my Ontario safety as well.

Answer 1

Here in northern Wisconsin its been down to -24 in the morning
WE need to be grateful they even start at all. Mine reacts much different in this cold weather
A motor starting just doesn't sound or run the same at these sort of temps. Make sure you leave your car run a while before you start to drive it. And always drive very conservative at first in these drastically low temps. Lets hope for warmer weather .

Answer 2

The jet engine sound is your cooling fan coming on, chirping is probably a pulley, maybe your tensioner..... for running rough that could be a vacuum leak, also check your spark plug wires, make sure none are loose or burnt.

Answer 3

Hmm...Chirping = bearing going out. Probably the A/C clutch.
Hesitation, ....hmm......still thinking.........Possible vacuum leak.
If the did a tuneup, they should have replaced the rotor, and distributor cap,........Could be a fuel pump going out. I had to replace mine in '91 Chevy truck.

I'm afraid I don't have a good answer for you....I'm sure someone else will have a GREAT idea I havn't thought of.
Good luck.

Answer 4

the chirping noise on and off sounds like the clutch on your ac compressor ,,I know its winter but it does run on your belt.Also you may have a bad idler pulley causing a chirping noise.
vehicles tend to have lots of noises when its cold out.I also live in a cold weather climate and my car makes lots of noises that i don.t here in the summer.