LuckyKenny Posted December 9, 2010 Share Posted December 9, 2010 I've noticed since it's dropped below 60 the car has a little less power. It runs fine in the cold, i drove it this morning in 35 degrees Just doesn't have the same ummph it does when it's 90 degrees and high humidity And it still beats mustangs lol I got to play with a 69 fastback on the way home from a show tonight, from a 40 roll he was at my rear tires until 60 Quote Link to comment Share on other sites More sharing options...
Z204me Posted December 9, 2010 Share Posted December 9, 2010 Cold? Are you for real...? Come spend a week, or a day, or a weekday with us...right now it is a warm 35*F...the warmest that it has been in like 3 weeks... The other day...the warmest that it got to was -13...and the low was -21! Also...I did have to start the 70 the other day...I had to move it out of the garage so that we could get the Christmas stuff out of the rafters...so I had to back the car out of the garage onto the concrete pad when it was -5 and a foot of snow on the ground! Car started right up after not being started/driven since late October! Anyway...Kenny...you would think that your car would run BETTER in cooler weather? As long as your car's coolant is up to a "normal" operating temperature, it should run real good in the "cold" weather... Bring it up here to Montana...we can test it up here...by spinning some donuts on the snow/ice in the parking lots... Cold...yea...I wish we were in my dream place right now...Corpus Christi, Texas...I would be working on the Monte's right now...instead, we have to drive our winter car's...89 Ford Probe GT's...little 4 bangers with turbo's...which are actually quite fast! Cold! Funny funny! Stay warm! Quote Link to comment Share on other sites More sharing options...
LuckyKenny Posted December 9, 2010 Author Share Posted December 9, 2010 lol it's running at 185-195 usually Quote Link to comment Share on other sites More sharing options...
maddmann313 Posted December 9, 2010 Share Posted December 9, 2010 goodness... thats cold and my friend has a 65 mustang with a 302 who wants to race me when i get the MC done!! Quote Link to comment Share on other sites More sharing options...
Heckeng Posted December 9, 2010 Share Posted December 9, 2010 Do you have a trans temp gauge on it? Mine will feel slow until the tranny fluid gets up to temp as well as the engine temp. Tranny seems to take twice as long for me, I don't run through the radiator cooler, I just have an external B&M cooler. If you have the transmission lines running through the radiator, it will help out in cold weather because it will actually warm up the trans and fluid. Is it pinging or anything like that? Cold weather will want more fuel, so if you don't have enough fuel, it could be running lean and if it is too lean it will lose power and detonate. Quote Link to comment Share on other sites More sharing options...
LuckyKenny Posted December 9, 2010 Author Share Posted December 9, 2010 that makes sense It's been set up for about 85 degrees with 90 percent humidity and the idle doesn't drop either after it's warmed up. I feel tightness in the pedal also could it be the choke? Quote Link to comment Share on other sites More sharing options...
Sam (Bones) Posted December 9, 2010 Share Posted December 9, 2010 didn't you put a holley on this? if so I would try going up 2-3 jet sizes to try it, you got nothing to lose I would adjust your idle jets too, and set them a smidge on the rich side I know I have to re-adjust mine when it gets cooler up here Quote Link to comment Share on other sites More sharing options...
cny first gen 71 Posted December 9, 2010 Share Posted December 9, 2010 Yea I hear ya on the cold Rod today we got up in the low 20s and another foot or so of snow, brings our three day count for snow to just below 3 feet and the good news there only calling for another 7 to 10 inches tonight. Spent 15 hours plowing the stuff today and more tomorrow HO HO HO HUMBUG. I didnt take monte out ha ha Quote Link to comment Share on other sites More sharing options...
kc8oye Posted December 9, 2010 Share Posted December 9, 2010 kenny.. yeah you have a choke problem. .that will definitely kill power. Quote Link to comment Share on other sites More sharing options...
LuckyKenny Posted December 9, 2010 Author Share Posted December 9, 2010 kenny.. yeah you have a choke problem. .that will definitely kill power. It's like 15% off Nothing insane just makes me wonder a little bit when it's about 60-65 outside the car runs absolutely perfect, it is amazing lol It's supposed to warm up by the end of the week so i'll just drive it the way it s for now Quote Link to comment Share on other sites More sharing options...
Chevyss Posted December 9, 2010 Share Posted December 9, 2010 Man Rodney, that's cold. -13?? Don't tell me you think Corpus Christi, TX is a great place. I was there for 23 years. Rust city. I used to have to wash my car almost daily w/all the salt on it. It was always garaged also. To hot and too much humidity. Quote Link to comment Share on other sites More sharing options...
kc8oye Posted December 9, 2010 Share Posted December 9, 2010 kenny, you might need to adjust your choke a bit when the temps drop like that. I know when i was in michigan I always had two choke settings.. 'summer' and 'winter' with the winter settings, the choke wouldn't come on to 'full' and made starting it in the warmer summer air much more difficult.. in the winter, the summer settings would stop the choke from coming off completely.. Quote Link to comment Share on other sites More sharing options...
Andy's Auto Posted December 13, 2010 Share Posted December 13, 2010 Kenny, don't listen to our Southern Canadienne cousins (anything North of the Georgia state line). Although it is weird you car runs slower in cooler temps. Time to put a fresh set of plugs in it and hope for the best. The carb would benifit from a few jet changes but a QJet is no Holley. I have treated Rochesters as VooDoo my whole life. Run what it gives you or swap it to a Holley. Getting Bu ready for weds today which meand the carb comes apart. Power valve hits the ground and a few steps up on the jets. But when it gets above 60, all that gets reversed. Andy Quote Link to comment Share on other sites More sharing options...
wallaby Posted December 13, 2010 Share Posted December 13, 2010 I don't know about the place you live, but here in California the gasoline formulation changes in winter. I think they use a higher percentage of ethanol in the winter blend, or maybe change the amount of oxygenation? I don't really notice a difference with my "modern" fuel-injected cars, but I sure feel a difference in pep with my old carbureted cars. Both types see a drop in MPG in the winter months. Quote Link to comment Share on other sites More sharing options...
BAMC1369 Posted December 14, 2010 Share Posted December 14, 2010 Cold? Are you for real...? Come spend a week, or a day, or a weekday with us...right now it is a warm 35*F...the warmest that it has been in like 3 weeks... Haha was that a cheech & chong qoute? haha Quote Link to comment Share on other sites More sharing options...
kc8oye Posted December 15, 2010 Share Posted December 15, 2010 mark, the cold air also will cause a drop in mpg's.. cold are is more dense.. more air means more fuel.. even a carb will respond like that. Quote Link to comment Share on other sites More sharing options...
LuckyKenny Posted December 15, 2010 Author Share Posted December 15, 2010 it was 30 this morning, it ran fine just really lean Quote Link to comment Share on other sites More sharing options...
kc8oye Posted December 15, 2010 Share Posted December 15, 2010 some web pages i read online kenny suggest going up 2 jet sizes for the cold weather... Quote Link to comment Share on other sites More sharing options...
MagicDragon42 Posted December 15, 2010 Share Posted December 15, 2010 cold are is more dense.. more air means more fuel.. even a carb will respond like that. If that is the case why does an engine with a carburetor run richer the higher you go in altitude where the air is not as dense and leaner the lower you go where the are is denser? I live in Colorado and a car tuned to run well at 5,000 feet belches black smoke at 10,000 feet. Mike Quote Link to comment Share on other sites More sharing options...
kc8oye Posted December 15, 2010 Share Posted December 15, 2010 because there is a huge difference in air pressure.. not just air temperature. Quote Link to comment Share on other sites More sharing options...
cbolt Posted December 15, 2010 Share Posted December 15, 2010 Just leave it alone. Why re-jet a car for a week of cold weather unless you are heading to the track? It'll be 70 or warmer by the end of the week. Quote Link to comment Share on other sites More sharing options...
kc8oye Posted December 15, 2010 Share Posted December 15, 2010 running rich hurts your wallet.. running lean hurts your engine. Quote Link to comment Share on other sites More sharing options...
jim's 70 Posted December 16, 2010 Share Posted December 16, 2010 Get a screwdriver...go outside and play...whats it gonna hurt??Yes..colder air will require more fuel, but what the heck...thats the fun in these cars...constantly tuning to get the best out of it.. Kenny, wait till you get up here...better put money in the budget for a beater...this week in the teens to twenty's...next week 40's-50's...go figure lol Quote Link to comment Share on other sites More sharing options...
LuckyKenny Posted December 16, 2010 Author Share Posted December 16, 2010 Wait so running it hard when it's running lean is bad for it? How bad? Quote Link to comment Share on other sites More sharing options...
LuckyKenny Posted December 16, 2010 Author Share Posted December 16, 2010 I'm going to go play with it, i've just been afraid to mess with the air fuel mix because i don't want to make things worse, and the fact that i don't really know what i'm doing Quote Link to comment Share on other sites More sharing options...
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