Warm up or start and go (1 Viewer)

[secretsquirrel]

So my neighbor questioned me as to why I let my car run for 5 mins (longer when cold) or so before leaving? I fall into the thinking that it is good to let things get up close to temp. Easier on componets in the long run. He was claiming that 1 min is good and to just go easy for the first bit of driving and save a little gas in the process. It just made me wonder what is the proper way to go about this or is this a 6 one way half a dozen another.

 

[dales33]

I've never really warmed up anything I've owned like that and I've done some big miles on engines.
I've also had new engines that i treat the same.
basically i get in the vehicle, start it up, check I've got everything i need for the day and pretty much get going, i use my 80 for work too so this takes a minute or two and I'm off.
did the same in my diesel hiace van.
i think its more important to check the oil and service the drive train and motor than warm it up for long periods of time…. then again i live in costal victoria, it dosnt get that cold

 

[nathan117]

if it's above 20 degrees I generally just let the engine get good oil pressure and go (something I haven't always done but I think is important). Anything under 20F I generally let it warm up for a few minutes if I have time. I try to keep the engine under 2500 RPM until it is up to temp either way though. I don't know why I do it this way it's just habit I guess. I was a lot harder on my rebuilt 4runner. It would be a cold engine and -20f and i'm pushing red line but i'm a bit nicer to my old fj80. haha.

 

[JCruse]

I start up and wait for the oil pressure gauge to rise to full (just a few seconds) and then give the heads time get bathed in oil (a few seconds more) then I drive off very gently for the first few minutes, then I just take it easy until the engine reaches full temperature.
I didn't hear or read this method anywhere, I just took all the things I've learned over the years, put them in my head, shook vigorously, and this is what came out.

 

[sandcruiser]

long idling is a waste. drive gently as soon as you have oil pressure.

 

[ErikinSC]

I've got a remote start for my F350 6.0 diesel, and I religiously start my truck and let it idle for 5- 15 mins. Doesnt matter if it is 72F or 32 F, but I tend to let it run longer when its colder. I plan on alllowing the FJ40 a similar consdierations.

 

[Shane potter]

I Let my 83 fj60 with 290k miles run generally at least 10 mins if I don't its real sluggish but if I let it warm up it runs lots better jus my 2¢

 

[Scottb4857]

About the only time you need to warm it up while idling is if it is really cold - say below -10. Assuming using a standard 5w-30 oil the pour point of the oil is around -40 degrees celsius (-40 Fahrenheit) . If your somewhere where it gets close that cold then you need to be looking at engine warmers and such so the oil can flow properly during start up. Even at those temps though a couple minutes and the oil is warm enough to start driving safely assuming you're not trying to redline the engine..

Of course this discusses only the safety of the engine as it relates to oil flow and oil pressures. If you are idling to warm up the interior or defrost/deice the windows so you can see and drive safely then your consideration is how much fuel your using or extra exhaust gases your emitting.

 

[Ermagerd]

long idling is a waste. drive gently as soon as you have oil pressure.

I had a lengthy discussion about warm up with the developer of Forced Performance when I tested the FPblack on my old evo x. The consensus was what I quoted above for a forced induction engine. For a naturally aspirated engine that does not go into positive pressure, it is not as important. All in all, following the driving gently until warmed up is a good method to follow.

 

[Output Shaft]

But also remember that a cold engine with a cold carburetor and cold intake manifold gets horrible gas mileage until the engine gets up to temp. So it's not like there is significant fuel savings by starting up and driving away 30 seconds later in an effort to save gas.
I think if your engine could talk, he'd say, "Hey bud, let me wake up a bit before taking me out on the road."

 

[fj80jeepcrusher]

Hello I'm new to the forums... I have a problem my fj80 will start after 20 min will die and won't start till it's cold we changed the coil and ignitor... Didn't fix it please help

 

[Output Shaft]

Greetings and welcome!
Your question would be best directed at the 80-Series Tech Forum. This forum here you've reached is the primary drinking hole for FJ60/62 maniacs.

LINK to the FJ80 Tech Forum